We present an investigation of two non-equilibrium systems: spatial many-species predator-prey games and systems of interacting magnetic skyrmions. We numerically study two predator-prey systems characterized by nested pattern formations. We first consider a six species game in which spiral patterns spontaneously form within coarsening domains. Through a systematic investigation of relevant correlation functions, the interface width, and other quantities, we show that the non-trivial in-domain dynamics affect the coarsening process and the interfacial properties. The exponents which govern domain growth, aging, and interface fluctuations differ from those expected from curvature driven coarsening. The response to perturbations of the reaction rates is also studied. Furthermore, we introduce a nine species model characterized by nested spiral pattern formations. Quantitative evidence of the existence of two length and time scales associated to the spiral levels is presented in the form of correlation lengths and a temporal Fourier analysis of the species densities. A generalized interaction scheme is proposed for dynamically generated hierarchies. Magnetic skyrmions are particle-like spin configurations found in certain chiral magnets. We study the effect of the Magnus force on the relaxation dynamics through Langevin molecular dynamics simulations. The Magnus force enhances the disorder of the system at high noise strengths while we observe a dynamic regime with slow decaying correlations at low noise strengths. The different regimes are characterized by changes in the aging exponent. In general, the Magnus force accelerates the approach to the steady state. In the presence of quenched disorder, we find that the relaxation dynamics are more robust in systems with a strong Magnus force. We also examine periodically driven skyrmion systems and show that a transition from reversible to irreversible flow exists in the presence of attractive defects. The Magnus force enhances the irreversible regime in this case. The work on predator-prey systems was supported by the U.S. National Science Foundation through Grant No. DMR-1606814 whereas the work on skyrmions was supported by the US Department of Energy, Office of Basic Energy Sciences (DOE-BES), under Grant No. DE-FG02-09ER46613. / Doctor of Philosophy / We present an investigation of two non-equilibrium systems: spatial many-species predator- prey games and systems of interacting magnetic skyrmions. We numerically study two predator-prey systems characterized by nested pattern formations. We first consider a six species game in which spiral patterns spontaneously form within coarsening domains. Through a systematic investigation of relevant correlation functions, the interface width, and other quantities, we show that the non-trivial in-domain dynamics affect the coarsening process and, to a greater extent, properties at the interface between competing groups of species. The exponents which govern domain growth, aging, and interface fluctuations are shown to differ from those expected in typical games of competition. We also study the change of the system due to a perturbation of the reaction rates, which could represent an abrupt change in the environment. Furthermore, we introduce a nine species model characterized by the emergence of nested spiral pattern formations. Quantitative evidence of the existence of two distinct spiral levels is presented. We also propose a generalized interaction scheme for dynamically generated spiral hierarchies. Magnetic skyrmions are particle-like spin configurations found in certain chiral magnets. We study the effect of the Magnus force on the dynamic properties of skyrmion systems through particle-based simulations. The Magnus force enhances the disorder of the system at high noise strengths while accelerating the formation of the triangular lattice at low noise strengths. We find that, in general, the Magnus force accelerates the approach to the steady state. In the presence of randomly placed attractive pinning sites, we find that a strong Magnus force can prevent caging effects and allow skyrmions to more easily move around pinning sites. We also examine periodically driven skyrmion systems and show that a transition from reversible to irreversible flow exists in the presence of attractive defects. The Magnus force is shown to enhance the irreversible regime in this case. The work on predator-prey systems was supported by the U.S. National Science Foundation through Grant No. DMR-1606814 whereas the work on skyrmions was supported by the US Department of Energy, Office of Basic Energy Sciences (DOE-BES), under Grant No. DE-FG02-09ER46613.

Submitted by Renata Lopes (renatasil82@gmail.com) on 2016-04-04T17:14:27Z No. of bitstreams: 1 franciscodaschagasrodriguesdeoliveira.pdf: 1015730 bytes, checksum: 88c19573e27b38b097a2392601a52b93 (MD5) / Approved for entry into archive by Adriana Oliveira (adriana.oliveira@ufjf.edu.br) on 2016-04-24T04:08:00Z (GMT) No. of bitstreams: 1 franciscodaschagasrodriguesdeoliveira.pdf: 1015730 bytes, checksum: 88c19573e27b38b097a2392601a52b93 (MD5) / Made available in DSpace on 2016-04-24T04:08:00Z (GMT). No. of bitstreams: 1 franciscodaschagasrodriguesdeoliveira.pdf: 1015730 bytes, checksum: 88c19573e27b38b097a2392601a52b93 (MD5) Previous issue date: 2013-10-25 / Este trabalho tem como objetivo discutir ações das equipes gestoras de quatro escolas sob a jurisdição da 13ª Coordenadoria Regional de Desenvolvimento da Escola (13ª CREDE), localizadas na microrregião Sertões de Crateús, zona norte do estado do Ceará, nas quais é perceptível o apoio às atividades de formação continuada dos professores em serviço. Além disso, essas escolas, através de suas boas práticas, atingiram melhores resultados educacionais, especialmente no SPAECE. Buscamos, portanto, por meio de uma pesquisa qualitativa, na forma de um estudo de caso, refletir sobre como os gestores atuam enquanto mediadores e incentivadores dos processos de formação dos docentes. Tal como se percebe, alguns gestores e professores já têm uma visão diferenciada, cuja perspectiva é de se fazerem protagonistas de um processo formativo que nasce e se desenvolve no seio da escola, como fruto de uma consciência crítica já amadurecida, que sente a necessidade de aperfeiçoamento para melhor atender às demandas da prática pedagógica. Para analisarmos essa realidade, utilizamos entrevistas semi-estruturadas com diretores e coordenadores escolares e aplicamos questionários aos professores. A escolha do tema se justifica pela atuação do pesquisador como diretor de uma escola pública de estado do Ceará, preocupado com a formação de seus professores e com o processo de ensino-aprendizagem de seus alunos. Os principais resultados encontrados estão ligados a boas práticas e pontos de melhoria., Propomos um Plano de Ação Educacional – PROFORPE - (voltado para a implantação de uma cultura de formações continuadas dos professores em serviço nas escolas onde essa ainda não existe, de modo a incentivar gestores e docentes a criarem suas próprias formações, de acordo com as necessidades e a realidade específica de cada escola. / This work aims to discuss some actions by the management staff of four schools from 13ª Coordenadoria Regional de Desenvolvimento da Escola (13th Regional Coordination of School Development – 13th CREDE), located in the microregion of Sertão de Crateús, northern of Ceará, a state in Brazil, where we can note the support on the activities of continuing education of teachers. Furthermore, these schools, through their good practices, achieved better educational outcomes, especially on SPAECE (a large-scale external assessment). So, we aims to, through a qualitative research, as a case study, reflect on how the school managers act as mediators and supporters of the processes of teacher educational formation. As we realized, some managers and teachers already have a different view, taking an active part on the training process that germinated and developed inside the school, as the result of a matured critical consciousness, which feels the needing of improvement to better comply with the demands of the teaching practice. In order to analyze this reality, we used semi-structured interviews made with directors and school coordinators, and we applied questionnaires on the teachers. The choice for this subject-matter is justified by the function of the researcher as a director of a public school in Ceará/Brazil, always concerned about his teachers’ formation and about the teaching and learning process of the students. The main results of this research are linked to good practices and improvement points. Thus, we propose an Educational Plan of Action focused on the implementation of a continuing formations culture of teachers in the schools where it does not exist yet, in order to encourage managers and teachers to create their own formations, according to the needs and specific reality of each school.

Dans le contexte actuel d'évolution et de transformation du travail, notre recherche s'attache à comprendre et à expliquer de quelle manière des acteurs professionnels (individuels et collectifs), engagés dans la définition des politiques et des pratiques de formations professionnelles aéronautiques, parviennent, collectivement, à se mettre d'accord sur des normes et des contenus de programmes de formation. Cette recherche compare des activités de délibérations collectives de deux groupes professionnels (l'un à dimension nationale et l'autre à dimension locale) qui ont en charge la définition de nouveaux programmes et normes de formations techniques qualifiantes. Les membres de ces groupes (27 et 20 sujets) représentent des entreprises, des formateurs, responsables de lycées techniques, des Ministères compétents, des figures individuelles reconnues du secteur aéronautique au plan national. Au niveau méthodologique, dans une approche exploratoire compréhensive, nous avons observé et enregistré systématiquement les réunions de ces deux groupes durant une année. Nous avons aussi analysé les discours qui en découlent ainsi qu'effectué et examiné des entretiens semi-directifs et des questionnaires que nous avons construits. Dans une perspective systémique, active et plurielle de la socialisation, le modèle de l'interstructuration du sujet et des institutions (Baubion-Broye & Hajjar, 1998) auquel nous nous référons considère que les activités du sujet sont construites et signifiées par lui, tout au long de sa vie, et en interaction avec autrui. Nos résultats montrent, notamment, que les décideurs prennent majoritairement des décisions collectives par " consensus apparent " et qu'il y a un lien entre l'expression manifeste d'alliances et le degré de consensus. Les relations interpersonnelles évoluent au cours du temps.

Nodules within the lower Bokkeveld shales often contain well-preserved invertebrate fossil material. The aim of this study was to describe some characteristics seen at various scales (macro-, micro- and ultra -) within nodules that might contribute to an understanding of aspects of nodule formation and the reasons for the excellent preservation of the fossil material within these nodules. Detailed, high quality macro-photographs were taken of sliced and whole nodule surfaces and a catalogue was produced to tentatively identify fossils present and illustrate the variations seen within nodules. Selected nodules were then subjected to petrographic, ultra-structural (SEM) and some chemical (EDS, XRD & XRF) analysis to investigate the possible reasons for these variations. The chemical results have indicated that nodules are enriched with quartz compared to the surrounding shale. Quartz is also the dominant mineral replacing trilobite carapace material within nodules, while trilobite material within shales is replaced with equal proportions of hematite, biotite and quartz. It appears that the higher resistance of quartz to weathering is the dominant factor leading to the preservation of both nodules within the shales and trilobite material within the nodules examined. A comparison with some Western Cape nodules highlighted possible variations in overall nodule chemical composition along strike. Western Cape nodules are predominantly composed of apatite whereas the Cockscomb nodules are mainly composed of quartz. This quartz-apatite compositional variation in nodules occurring within a single formation has been reported from nodules found in the Armorican Massif of France which are very similar in a number of respects to the Bokkeveld nodules described in this study. Based on various features of the fossils present and the structure of nodules they were probably formed during early diagenesis within an epeiric marine deposit greatly affected by sea level fluctuations.

L’Archéen, de 4 à 2,5 Ga, est la période qui a connu les plus grands bouleversements géologiques et biologiques de l’histoire de la Terre : formation des continents, transition d’une tectonique à composante verticale vers une tectonique des plaques horizontale, apparition de la vie, … Le but de cette thèse est d’étudier les conditions environnementales de la Terre à l’Archéen, par l’analyse des compositions isotopiques de métaux de transition (Fe, Zn) de roches provenant principalement de la province d’Isua au Groenland (3,8 Ga). Après avoir adapté le protocole de séparation du Fe, Cu, Zn à des échantillons riches en Fe, nous avons acquis les données par spectrométrie de masse à source plasma et à multicollection MC-ICPMS. Nous nous sommes d’abord intéressés au processus de serpentinisation de la croûte océanique, réaction produisant à la fois des nutriments pour la vie (CH 4 , H 2 ) et des minéraux catalyseurs (mackinawite) de la formation abiotique d’acides aminés, molécules du vivant. L’affleurement d’Isua comporte une unité ophiolitique présentant les serpentinites les plus anciennes (3.81-3.70 Ga) : leur analyse permet d’appréhender la réaction de serpentinisation à l’Archéen. Les résultats obtenus pour la composition isotopique du zinc dans ces roches et dans des serpentinites modernes ont permis d’établir une correspondance entre le processus de serpentinisation à Isua et la mise en place de volcans de boues de serpentinites à l’aplomb de la fosse des Mariannes. Nous avons ainsi pu identifier Isua comme une zone d’arrière-arc de subduction océanique, lieu d’une serpentinisation produisant des fluides de température variable (100-300°C) et de pH alcalin (9-12). Nous montrons que cette configuration atypique réunissant serpentinisation, fluides alcalins et édifices volcaniques est favorable à l’émergence du vivant. Nous avons ensuite analysé de nombreux échantillons de formations de fer rubané (BIFs), sédiments propres à l’Archéen et au début du Protérozoïque. L’évolution de la composition isotopique du zinc de ces échantillons au cours du temps a permis d’établir une chronologie de l'émersion des continents.Nos résultats sont en faveur d’une émersion débutant il y a 2,9 Ga. Enfin, nos données nous informent sur la colonisation des continents émergés par la vie à 2,6 Ga et sur la pédogenèse de sols archéens comportant un horizon organique. / During the Archean (4 to 2.5 Ga ago), the Earth experienced the biggest changes in terms of geological and biological settings – continental growth, transition from sagduction towards purely horizontal plate tectonics, emergence of life, … The purpose of the present study is to better understand the archean earth environment by measuring the isotopic composition of transition metals – Zn, Fe – of archean rocks. Most of the samples belong to the Isua supracrustal belt, in Greenland, dated 3.8 Ga. The chemical extraction protocol of Fe, Cu, Zn was adapted to our Fe-rich samples and isotopic analyses were conducted by multicollection inductively coupled plasma mass spectrometry. The serpentinization of the oceanic crust produces fuels for life (CH 4 , H 2 ) and mackinawite, which catalyses formation of complex organic compounds. Serpentinization may thus provide a suitable environment for the emergence of the first biomolecules. We analysed the oldest known serpentinites from Isua (3.81-3.70 Ga) to comprehend the archean serpentinization process. The isotopic compositions of zinc reported in this samples and in modern serpentinites attest to a strong similarity between Isua and the Mariana serpentinite mud volcanoes. We identified Isua as an oceanic forearc environment permeated by high-pH (9-12) hydrothermal solutions at medium temperature (100-300°C). We show that such an environment could have fostered the emergence of early life. We also analyzed several banded iron formations (BIF), which are sediments limited to the Archean and Proterozoic. The temporal evolution of these samples' isotopic composition shows a close relationship with the continental freeboard. Our results support the continental emersion starting 2.9 Ga ago. Besides, we identified the life colonization of continents at 2.6 Ga together with pedogenesis of archean soils with an organic horizon.

Les parcs nationaux canadiens ont pour mandat le maintien de l'intégrité écologique des écosystèmes. Pour accomplir cette mission, les gestionnaires doivent pouvoir compter sur une connaissance approfondie des caractéristiques et de la dynamique des milieux physiques qui supportent la biodiversité. Au Parc national du Canada Kouchibouguac, divers auteurs ont cherché à décrire le milieu physique, notamment par le biais de la cartographie des formations meubles et de la géomorphologie. Or, ces travaux ont été produits avec des objectifs et des méthodes différents, à diverses échelles et sur divers supports. Le portrait qui se dégage de l'ensemble comporte des incertitudes et des contradictions quant à certains faits ou à leur interprétation. Le projet de cartographie géomorphologique numérique du Parc national du Canada Kouchibouguac vise donc à produire une synthèse des connaissances géomorphologiques relatives à ce territoire. La méthodologie mise en oeuvre dans le cadre de ce projet consistait à répertorier et à comparer les informations disponibles, à les compléter et à tenter de résoudre les contradictions, en vue de produire une carte géomorphologique complète du parc. Cette démarche s'appuyait principalement sur la photointerprétation, des vérifications sur le terrain, des analyses granulométriques de sédiments et, finalement, la cartographie numérique. Au terme du processus, la carte géomorphologique et la banque de données géospatiales remises aux gestionnaires du parc pourront être intégrées au système d'information géographique en place. La démarche n'a pas permis de répondre entièrement aux questions soulevées lors de la confrontation des travaux antérieurs. Toutefois, la banque de données géospatiales sous-jacente à la carte facilitera l'intégration des nouvelles connaissances géomorphologiques au fur et à mesure que celles-ci deviendront disponibles. Elle ouvre également la porte au suivi des environnements les plus dynamiques du parc, en particulier le littoral, à l'aide de la géomatique Enfin, la synthèse géomorphologique pourra être utilisée tant pour planifier les aménagements à l'intérieur du parc que pour enrichir les activités d'éducation et de sensibilisation destinées aux visiteurs.

There is a growing number of virtual agents in today's virtual worlds. This is directly related to the need of coordinating their behavior and movement. In this work we design algorithms to maintain desired formation of agents while moving through difficult terrain. The methods we study should maintain the requirements of the formation as well as traverse along various obstacles. We then use an arbitrary fitness function to compare the performance of these methods on typical scenarios.

Master of Science / Department of Geology / Matthew Totten / There are some who hold the view that liquid hydrocarbons in the upper Paleozoic formations in Kansas are being locally derived. It has been the long held belief that the liquid hydrocarbons found in Kansas have come from distant sources in Oklahoma. To shed further light on this issue about the origin of hydrocarbons in the upper Paleozoic formations in Kansas, a study was conducted to analyze the geochemical characteristics of REE in Lansing-Kansas City oils that were collected from several locations in a small area within Rooks County, Kansas. The total REE contents in these oils ranges from about 3.1 ng (or 10-12 gram) per Liter of oil to about 131 ng per Liter of oil. The pattern of relative distribution of the REEs for each oil sample has been constructed from values that were obtained by dividing the individual REE concentrations of a given oil sample by the respective concentrations of the REEs in a standard or a reference sample (such as PAAS, a representation of average argillaceous sediments in the crust that is commonly used for the analyses of a variety of crust originated sedimentary products). A standard- normalized relative distribution pattern of an oil sample can reveal an important history of chemical evolution of the oil of interest. The PAAS-normalized patterns of relative distribution of the REEs in the Lansing-Kansas City oils from Rooks County, Kansas are significantly diverse. Although nearly all oil samples investigated in this study have varied degrees of light REE-enrichment across the REE series from La to Sm, they differed in their relative Ce abundances. Some samples have positive Ce anomalies; some have negative Ce anomalies, and some others with the absence of any Ce anomaly. The oils also differed in their PAAS-normalized relative distribution of the middle rare earth elements (MREEs), ranging from Sm to Tb. All oil samples were relatively enriched in the MREEs, but with varied degrees of enrichment from a prominent one to almost a barely noticeable one. The oils differed in their relative distributions of Eu, as some were with a positive Eu anomaly, some with a negative Eu anomaly, and some with the absence of any Eu anomaly. The trends of the heavy rare earth elements (HREEs) from Tb to Lu among the oils ranged from nearly flat for the most oils to a progressive depletion across the series for few samples. Furthermore, the oils were varied in having prominently anomalous relative distributions, in some cases with a positive anomaly and in others with negative anomaly, for such elements as Tb, Ho, and Tm (MM-JS-04, MM-MC-3A, and MM-MC-01). The anomalies for Tb, Ho, Tm are reflections of enzyme activity of source material during its primary (growth) environment. The metals are known to be preferentially located at the active sites of the enzymes. The oils not only differed significantly in their REE-geochemical characteristics, they also had a wide range of K/Rb weight ratios from about 877 to about 2000. These high values are typically the ones that can be assigned to organic materials, well exceeding the range of values that are associated with common silicate minerals and rocks, having an average value of 250-350ppm. Different zones in the Lansing-Kansas City formations also show distinct REE distribution patterns. There are four broadly classified distribution patterns. MREE enrichment can be observed in samples with production from the middle Lansing-Kansas City zones (G-I). In samples with comingling Lansing-Kansas City zones, amplification of anomalies from differing source materials can be observed. The diversity in the REE distribution patterns and K/Rb ratios in oils collected from central Kansas makes a strong argument against long distance transportation from a distant source in Oklahoma

Automation of "contour method" for cliff drawing Abstract This thesis deals with the design of automated creation of cartographic representation of rocks - specifically contour methods. Based on the study of the rules of this method and its use on analog maps, rules for its processing in digital cartography were designed and an algorithm for automated creation of this representation was designed and implemented. The algorithm is based on the design of the contour method described in the study Topographic mapping of rock formations with the use of airborne laser scanning data by J. Lysák (2016) and the output data of the study Sandstone landscapes in GIS by M. Tomková (2015). The algorithm was implemented in the form of Python scripts using the arcpy library. The thesis also includes testing the algorithm on data from sandstone areas in the Czech Republic. key words: rocks formations, visualization of hypsography , digital cartography, contour method

MSc., Faculty of Science, University of the Witwatersrand, 2011 / Granitoid intrusions are numerous in southwestern Rajasthan and are useful because they can provide geochronological constraints on tectonic activity and geodynamic conditions operating as the time of intrusion, as well as information about deeper crustal sources. The particularly voluminous Neoproterozoic felsic magmatism in the Sirohi region of Rajasthan is of particular interest as it may have implications for supercontinental (Rodinia and Gondwana) geometry. The Mt. Abu granitoid pluton is located between two major felsic suites, the older (~870-800 Ma) Erinpura granite and the younger (~751-771 Ma) Malani Igneous Suite (MIS). The Erinpura granite is syn- to lateorogenic and formed during the Delhi orogeny, while the MIS is classified as alkaline, anorogenic and either rift- or plume-related. This tectonic setting is contentious, as recent authors have proposed formation within an Andean-type arc setting. The Mt. Abu granitoid pluton has been mapped as partly Erinpura (deformed textural variant) and partly younger MIS (undeformed massive pink granite). As the tectonic settings of the two terranes are not compatible, confusion arises as to the classification of the Mt. Abu granitoid pluton. Poorly-constrained Rb-Sr age dating place the age of formation anywhere between 735 ± 15 and 800 ± 50 Ma. The older age is taken as evidence that the Mt. Abu intrusion was either a late phase of the Erinpura granite. However, U-Pb zircon geochronology clearly indicates that the Mt. Abu felsic pluton is not related to- or contiguous with- the Erinpura granite suite. The major results from this study indicate that the all textural variants within the Mt. Abu pluton were formed coevally at ~765 Ma. Samples of massive pink granite, mafic-foliated granite and augen gneiss from the pluton were dated using U-Pb zircon ID-TIMS at 766.0 ± 4.3 Ma, 763.2 ± 2.7 Ma and 767.7 ± 2.3 Ma, respectively. The simple Mt. Abu pluton is considered as an enriched intermediate I- to A-type intrusion. They are not anorogenic A-types, as, although these felsic rocks have high overall alkali and incompatible element enrichment, no phase in the Mt. Abu pluton contains alkali rich amphibole or pyroxene, nor do REE diagrams for the most enriched samples show the gull-wing shape typical of highly evolved alkaline phases. The alkali-enriched magma may be explained by partial melting of a crustal source such as the high-K metaigneous (andesite) one suggested by Roberts & Clemens (1993), not derivation from a mantle-derived mafic magma. The fairly restricted composition of Mt. Abu granitoids suggests that partial melting and a degree of assimilation/mixing may have been the major factors affecting the evolution of this granitoid pluton; fractional crystallization was not the major control on evolution of these granitoids. Revdar Rd. granitoids that are similar in outcrop appearance and petrography to Mt. Abu granitoids also conform to Mt. Abu granitoids geochemically and are classified as part of the Mt. Abu felsic pluton. Mt. Abu samples from this study have a maximum age range of 760.5-770 Ma, placing the Mt. Abu pluton within the time limits of the Malani Igneous Suite (MIS) as well as ~750 Ma granitoids from the Seychelles. Ages of the Sindreth-Punagarh Groups are also similar. These mafic-ultramafic volcanics are thought to be remnants of an ophiolitic mélange within a back-arc basin setting at ~750-770 Ma. The three Indian terranes are spatially and temporally contiguous. The same contiguity in space and time has been demonstrated by robust paleomagnetic data for the Seychelles and MIS. These similarities imply formation within a common geological event, the proposed Andean-type arc (Ashwal et al., 2002) on the western outboard of Rodinia. The implications are that peninsular India did not become a coherent entity until after this Neoproterozoic magmatism; Rodinia was not a static supercontinent that was completely amalgamated by 750 Ma, as subduction was occurring here simultaneous with rifting elsewhere. Pageiv The Mt. Abu pluton has undergone deformation, with much of the pluton having foliated or augen gneiss textures. The timing of some of the deformation, particularly the augen gneiss and shear zone deformation, is thought to have occurred during intrusion. The Mt. Abu and Erinpura granitoids have experienced a common regional metamorphic event, as hornblende (Mt. Abu) and biotite (Erinpura) give 40Ar/39Ar ages of 508.7 ± 4.4 Ma and 515.7 ± 4.5 Ma, respectively. This event may have reactivated older deformatory trends as well. The temperature of resetting of argon in hornblende coincides with temperatures experienced during upper-greenschist to lower-amphibolite facies metamorphism. These late Pan-African ages are the first such ages reported for the Sirohi region and southern part of the Aravalli mountain range. They offer evidence for the extension of Pan-African amalgamation tectonics (evidence from southern India) into NW India. The age of formation of the Erinpura augen gneiss magma is 880.5 ± 2.1 Ma, thus placing the Erinpura granitoids within the age limits of the Delhi orogeny (~900-800 Ma; Bhushan, 1995). Most deformation observed here would have been caused by compression during intrusion. The Erinpura granitoids are S-type granitoids due to their predominantly peraluminous nature, restricted SiO2-content, normative corundum and the presence of Al-rich muscovite and sillimanite in the mode. Weathered argillaceous metasedimentary material may also have been incorporated in this magma, while the presence of inherited cores suggests relatively lower temperatures of formation for these granitoids as compared to the Mt. Abu granitoids. The age of inheritance (1971 ± 23 Ma) in the Erinpura augen gneiss is taken as the age of the source component, which coincides with Aravalli SG formation. The Sumerpur granitoids differ from the Erinpura granitoids in terms of macroscopic and microscopic texture (undeformed, rarely megaporphyritic) but conform geochemically to the Erinpura granitoid characteristics and may thus be related to the Erinpura granitoid suite.The Revdar Rd. granitoids that are similar in macroscopic appearance to Erinpura granitoids also conform geochemically, and may similarly belong to the Erinpura granite suite. A Revdar Rd. mylonite gneiss with the Erinpura granitoids’ geochemical signature was dated at ~841 Ma, which does not conform to the age of the type-locality Erinpura augen gneiss dated here, but later intrusion within the same event cannot be ruled out because of the uncertainty in the age data (~21 Ma). The presence of garnet in one Revdar Rd. (Erinpura-type) sample implies generation of these granitoids at depth and/or entrainment from the source, similar to the S-type Erinpura granitoids. The Ranakpur granitoids differ significantly from both the Erinpura and Mt. Abu intrusives due to their low SiO2-content and steep REE profiles (garnet present in the source magma); they are thought to have been generated under higher pressures from a more primitive source. The deeper pressure of generation is confirmed by the absence of a negative Eu-anomaly. The Ranakpur quartz syenite dated at 848.1 ± 7.1 Ma is younger by ~30 m.y. than the Erinpura augen gneiss. It is within the same time range as numerous other granitoids from this region as well as the Revdar Rd. granitoid dated in this study. The prevalence of 830- 840 Ma ages may indicate that a major tectonic event occurred at this time. The Ranakpur quartz syenite may have been generated near a subduction or collision zone, where thickened crust allows for magma generation at depth. The deeply developed Nb-anomaly in the spider diagram also implies a larger subduction component to the magma. The Swarupganj Rd. monzogranite is interpreted to have formed by high degrees of partial melting from a depleted crustal source and is dissimilar to other granitoids from this study. More sampling, geochemical and geochronological work needs to be done in order to characterize this intrusion. Pagev The Kishengarh nepheline syenite gneiss is situated in the North Delhi Fold Belt and is the oldest sample dated within this study. The deformation in this sample is due to arc- or continental- collision during a Grenvillian-type orogeny related to the amalgamation of the Rodinia supercontinent (and peninsular India), dated by the highly reset zircons at ~990 Ma. This is considered a DARC (deformed alkaline rock and carbonatite) and represents a suture zone (Leelanandam et al., 2006). The primary age of formation of this DARC is older than 1365 ± 99 Ma, which is the age of xenocrystic titanites from the sample. The granitoid rocks from this study area (Sirohi region) range widely in outcrop appearance, petrography and geochemistry. Granitoids from the Sirohi region dated in this study show a range of meaningful ages that represent geological events occurring at ~880 Ma, ~844 Ma, ~817 Ma, ~789 Ma, ~765 Ma and ~511 Ma. Granitoid magmatism (age of formation) in this region is predominantly Neoproterozoic, and the number of events associated with each granitoid intrusion as well as diverse tectonic settings implies a complexity in the South Delhi Fold Belt that is not matched by the conventional and simplified view of a progression from collision and orogeny during Grenvillian times (Rodinia formation), through late orogenic events, to anorogenic, within-plate (rift-related) alkaline magmatism during Rodinia dispersal. Instead, it is envisaged that convergence and subduction during the formation of Rodinia occurred at ~1 Ga (Kishengarh nepheline syenite deformation), with a transition to continental-continental collision at ~880-840 Ma (Erinpura and Ranakpur granitoids). This was then followed by far-field Mt. Abu and MIS magmatism, related to a renewed period of subduction at ~770 Ma. The last deformatory event to affect this region was that associated with the formation of Gondwana in the late Pan-African (~510 Ma).