The Seiland Igneous Province, of which 5400 km2 is exposed, is hosted within a discrete terrane within the northernmost part of the Caledonian orogenic belt. The Province consists of numerous mafic and ultramafic plutons emplaced into a sedimentary succession indicative of a continental setting. Accompanying this mafic magmatism is a significant volume of intermediate monzonitic and dioritic rock (10% of the total exposed igneous rock), as well as numerous nepheline syenite and carbonatitic intrusions. This study reports ID-TIMS U-Pb analyses on magmatic zircons from a range of intrusions, which indicate that the bulk of the Seiland magmatism took place between 560 Ma and 570 Ma, whereas previous studies had produced a range of ages between 420 Ma and 830 Ma. The data indicate that only one magmatic episode is represented in the rocks of the Seiland Igneous Province, invalidating previous models involving multiple rifting events over a period of 300 m.y. Detailed geochemical investigation of several plutons from an evolved high alkali suite of gabbroic intrusions in the Seiland Igneous Province has shown that these plutons are generally enriched in trace elements compared to layered intrusions from other areas across the globe, but that geochemically the gabbros are relatively homogenous. The rocks yield εHf and εNd values for the gabbroic rocks ranging from +8 to -6 and from +4 to -4, respectively, indicative of the contamination of mantlederived material with crustal material. The most primitive isotopic values are similar to those obtained from the carbonatites and nepheline syenites, indicating the same mantle source gave rise to the magmas that were subsequently emplaced as the Seiland Igneous Province. The homogeneous trace element content of the different mafic rocks most likely indicates a relatively homogeneous mantle source for the original magmas of the province, which has subsequently been affected by processes of assimilation and crustal contamination. The monzonitic and dioritic bodies in the Seiland Igneous Province are not derived from melted silicic crustal material and may have been formed by the melting of pre-existing mafic material. The new geochronology invalidates the metamorphic framework previously proposed for the Seiland Igneous Province, which postulated several orogenic events between the emplacement of the magmas and the Caledonian Orogeny. There is no evidence for metamorphic activity in the period between 570 Ma and 420 Ma, and there are monazites in gneissic rocks hosted within mafic rocks of Seiland age that preserve an age of 640 Ma. This leads to the conclusion that only one metamorphic event, the 420 Ma Caledonian Orogeny caused by the collision of Baltica and Laurentia, affected the Seiland terrane after the emplacement of the Seiland magmas. The new data obtained lead to a model for the evolution of the Seiland Province in which a number of heavily modified and contaminated mantle-derived mafic magmas derived from the mantle were emplaced into the continental crust of the Seiland nappe between 560 and 570 Ma. This magmatism was accompanied by the injection of alkaline magmas into the same area of the crust, and the melting of mafic rock emplaced earlier. This magmatic event is considered to have occurred in an extensional stress regime, possibly during intracontinental rifting or back-arc spreading. This event took place well before the 420 Ma Caledonian Orogeny, and thus the Seiland Igneous Province can be considered a remnant of an older geological terrane that was emplaced onto the margin of Baltica during the Caledonian Orogeny.

No sul do Brasil, zonas de cisalhamento tem um papel importante na geração e posicionamento de magmas graníticos e básicos. As zonas de cisalhamento transcorrentes Quitéria-Serra do Erval (ZCQSE) e Dorsal de Canguçu (ZCTDC) fazem parte do Cinturão de Cisalhamento Sul brasileiro (CCSb), uma descontinuidade formada no Neoproterozoico, que compreende zonas de cisalhamento kilométricas, anastomosadas, de escala crustal, com cinemática predominantemente transcorrente, e estão relacionadas com a construção de um extenso batólito de quase 1000 Km (650-575Ma). Seu desenvolvimento iniciou após a colisão principal (ca. 650 Ma) entre os cratons Rio de La Plata e Kalahari. A ZCQSE controlou o posicionamento do Granodiorito Cruzeiro do Sul (635Ma) e dos Diques Tardios granodioríticos a monzograníticos (605Ma), dos granitoides de afinidade tholetítica, Arroio Divisa (625Ma), e seu pulso mais evoluído, os Granitoide Sanga do Areal (620Ma). A presença de enclaves máficos contemporâneas com esses granitoides, indicam que fontes mantélicas foram ativas durante seus posicionamentos. Valores de ƐNd entre -3.32 a -10.93 e razões de 87Sr/86Sr(i) entre 0.7048 to 0.7223 obtidas para os granitoides da QSESZ sugerem fontes mantélicas com alguma componente crustal. Xenólitos das rochas encaixantes, como as do Complexo Arroio dos Ratos (2.14Ga), são interpretadas como parte da contaminação crustal. Os padrões geoquímicos dos granitoides da ZCQSE indicam fontes e processos de diferenciação similares para todas as unidades. Dados geocronológicos dos magmatismos shoshoniticos com idades entre 635 e 605 Ma definem o período mínimo de atividade tectônica e magmática da ZCQSE, assim como expandem o intervalo do magmatismo shoshonítico no sul do Brasil, indicando uma ativação precoce de fontes mantélicas no Batólito Pelotas. Estes magmatismos de natureza shoshonítica e tholeítica registram os estágios iniciais do CCSb (640 630Ma), em um ambiente pós-colisional, logo após a colisão principal (650Ma) no ciclo Brasiliano / Pan-Africano. Neste trabalho, complexos processos de fusão parcial de fontes mantélicas e crustais envolvendo influxo de água, fluxo de calor adicional através de injeções félsicas e máficas, mixing, mingling, e descompressão relacionada a atividade de zonas de cisalhamento durante mais de 30 Ma, são sugeridos. O magmatismo ao longo da ZCTDC teve seu início com o Granito Quitéria e foi seguido pelo Granito Arroio Francisquinho, o primeiro de derivação mantélica e o segundo de fusão crustal. Novos dados U-Pb SHRIMP do Granito Quitéria apontam uma idade de 634 Ma, interpretada como idade de cristalização. Para o Granito Arroio Francisquinho, a idade de cristalização obtida em monazita e nas bordas de zircões, foi cerca de 610 Ma. Estas idades definem o período principal da atividade tectônica e magmática da ZCTDC. Uma compilação extensiva de dados isotópicos do magmatismo dentro e fora dos três batólitos que compõe o CCSb e do seu embasamento, permitiu estimar o intervalo do magamtismo pós-colisional no sul do Brasil entre 640 e 560Ma, e o intervalo dos picos termais causados por esse magmatismo no embasamento, entre 650 e 560 Ma. As idades de cristalização, heranças e os dados de Sr-Nd compilados, levaram a conclusão que estes três segmentos devem ser tratados como um único batólito. / Crustal-scale shear zones play an important role in the generation and emplacement of granitic and basic magmatism within the Neoproterozoic post-collisional setting of southern Brazil. The strike-slip Quitéria-Serra do Erval Shear Zone (QSESZ) and the Dorsal de Canguçu Transcurrent Shear Zone (DCTSZ) are part of the Southern Brazilian Shear Belt (SBSB), a major crustal discontinuity formed in the Neoproterozoic, which comprises several km-wide, anastomosing shear zones of dominantly transcurrent kinematics and is related with the building of an extensive, nearly 1000 km long batholith (650-575Ma). Its development is thought to have initiated after the main collision (ca. 650 Ma) between the Río de la Plata and Kalahari cratons. The QSESZ has controlled the emplacement of the shoshonitic Cruzeiro do Sul Granodiorite (635Ma) and late granodiorite to monzogranite dikes (Late Dikes, 605Ma), the tholeiitic Arroio Divisa granitoids (625Ma) and its more evolved pulse, the Sanga do Areal (620Ma). The presence of mafic rocks coeval with each of these granite magmas, found as mingled mafic enclaves, indicates that mantle sources were active during their emplacement. ƐNd values of -3.32 to -10.93 and 87Sr/86Sr(i) ratios from 0.7048 to 0.7223 obtained for the QSESZ granitoids suggest mantle sources with some evolved sources such as old continental crust. Host-rock xenoliths of the Paleoproterozoic Arroio dos Ratos Complex (2.14 Ga) are interpreted as crustal contaminants. Geochemical trends indicate similar sources and processes of differentiation for the QSESZ granitoids. Geochronological data of the QSESZ shoshonitic magmatisms indicates ages between 635 and 605 Ma and defines the minimum period of magmatic and tectonic activity of the Quitéria-Serra do Erval Shear Zone, as well as expand the time span for the shoshonitic magmatism in southern Brazil indicating an early activation of mantle sources in the Pelotas Batholith. These magmatisms of shoshonitic and tholeiitic nature records the initial stages of the SBSB (640 - 630Ma) in a post-collisional period, just after the Brasiliano / Pan-African main collisional event (650Ma). A complex process of partial melting of mantle and crustal sources involving water influx, additional heat flux from felsic and mafic injections, mixing, mingling and decompression related to the shear zone activity over 30 Ma duration is suggested. Magmatism emplaced along the DCTSZ has started with the mantle-derived Quitéria Granite and was followed by crustal melts such as the Arroio Francisquinho Granite (AFG). New U-Pb SHRIMP zircon data from the Quitéria Granite yielded a value of 634 Ma, interpreted as its crystallization age. The AFG crystallization age obtained in monazite, and zircon outer rims is ca. 610 Ma. The ages of these granites define the main period of coeval tectonic and magmatic activity of the DCTSZ. An extensive isotope data compilation of the magmatism within and outside the SBSB three batholith segments and its basement allows to estimate the time span of postcollisional magmatism in southern Brazil from 640 to 560 Ma, and the interval of the main thermal effects on the basement between 650 and 560 Ma. The crystallization/inherited ages and the Sr-Nd isotope data, lead to conclude that three segments should be addressed as a single batholith.

O Arco de São Gabriel é um terreno juvenil exposto na parte oeste do Cinturão Dom Feliciano, na parte sul da Província Mantiqueira, sul do Brasil. Aqui apresentamos os resultados de SHRIMP e LA-ICP-MS geocronologia U-Pb de 177 zircões detríticos das rochas metasedimentares do Complexo Cambaizinho. Oitenta e um grãos foram depois selecionados para o SHRIMP-II para a análise de δ18O. As idades variaram 840-660 Ma, com uma forte concentração entre ca. 750 e 700 Ma. O espectro de idade de zircões detríticos desta sucessão meta-sedimentar sugere que os sedimentos originais foram obtidos a partir da erosão do São Gabriel arco em si, muito provavelmente numa bacia de ante-arco. As razões Th/U e a texturas dos grãos de zircão revelam que eles eram em sua maioria erosão de rochas magmáticas no arco, sem qualquer contribuição relevante de suas contrapartes metamórficos, ou de qualquer outra fonte mais velha. Os valores de δ18O variam de 3,2-9,6%o o, e a maioria deles indicam derivação a partir de fontes juvenis, magmas manto-derivados. Três grupos distintos são reconhecidos: (i) ca. 840-750 Ma para os quais os valores de δ18O variaram entre 3,2 a 5,5%o o que sugere uma origem mantélica, sem qualquer contribuição continental, (ii) 750-700 Ma, com valores de δ18O que variam de 4,0 a 9,4%o o; este período é considerado como o pico do magmatismo dentro do arco, neste caso, tanto rochas mantélicas e continentais neoproterozóicas desempenhado um papel importante no fornecimento de sedimento para a Bacia Cambaizinho, (iii) 690-660 Ma, para os quais os valores δ18O variou entre 6,0 e 9,4%o o. Neste período, rochas continentais são a principal fonte de sedimentos; nenhum valor mantélico de δ18O são observados. Portanto, nossos dados fornece uma visão da evolução progressiva do arco de São Gabriel de uma zona de subducção intra-oceânico a cerca de 840-750 Ma para um ambiente de arco continental (idades <690 Ma), que precedeu o fechamento de um oceano, e a colisão continental no final do Neoproterozóico. / The São Gabriel Magmatic Arc (SGA) is a juvenile terrane exposed in the western part of the Dom Feliciano Belt (DFB) in the southern part of the Mantiqueira Province, southern Brazil. Here we present the results of combined SHRIMP and LA-ICP-MS U-Pb geochronology of 177 detrital zircons from the meta-sedimentary rocks of the Cambaizinho Complex (CC). Eighty-one grains were later selected for SHRIMP-II δ18O analysis. Ages ranged from 840 to 660 Ma, with a strong concentration between ca. 750 and 700 Ma. The age spectrum of the detrital zircon grains from this meta-sedimentary succession suggests that the original sediments were derived from the erosion of the São Gabriel Arc itself, most likely in a fore-arc basin. Th/U ratios and internal structures of the zircon grains reveal that they were mostly eroded from magmatic rocks in the arc, without any relevant contribution from their metamorphic counterparts, or from any other older source. The δ18O values varied from 3.2 to 9.6%o, and most of them indicate derivation from juvenile, mantle-derived magmas. Three distinct age groups are recognized: (i) ca. 840-750 Ma for which δ18O values varied between 3.2 to 5.5 %o suggesting a mantle-derived source, without any continental contribution, (ii) 750-700 Ma, with δ18O values ranging from 4.0 to 9.4 %o; this period is regarded as the peak of magmatism within the arc, in this case both mantle and continental derived Neoproterozoic rocks played an important role on sediment supply, (iii) 690- 660 Ma, for which δ18O values ranged between 6.0 and 9.4 %o. In this time period, continentalderived rocks are the main source of sediments; no mantle δ18O values are observed. Therefore, our data provides an insight into the progressive evolution of the SGA from an intra-oceanic subduction zone at ca. 840-750 Ma to a continental arc setting (ages < 690 Ma), which preceded ocean closure and continental collision at the end of the Neoproterozoic.

In spite of over three hundred years of commentary on Molière's plays, one area of research has been neglected by scholars, namely the role of language in the creation of comedy. Of those critics who have analysed Moliere's use of language, the majority have limited their focus to a small number of plays and do not consider what makes his discourse comic. Even more surprising is the fact that virtually no Moliériste has attempted to view Molière's language from the perspective of modern literary and linguistic theory. Consequently, the aim of this thesis is to explore the extent to which contemporary theory elucidates, or perhaps even obscures, our understanding of Moliere's language. While critics in the past have tended to apply a single theory to his plays, we will consider whether a multi-theoretical approach can best account for the range of Moliere's linguistic humour. The analysis of the comedies will be informed by post-Saussurean theories of language, many of which have never been applied to Moliere's work before. The first part of the thesis, entitled 'Language and Society' will address a long-standing debate which continues to divide Molièristes as to the nature of his comedy. Whereas W. G. Moore and Rene Bray have portrayed Moliere as an actor and director, whose primary aim was to amuse his audience, this theatricalist position has been challenged in recent years by the socio-critical theories of James Gaines, Paul Benichou, Larry Riggs and Ralph Albanese. We will consider whether it is possible to reconcile these two opposing approaches through an examination of parody. The second part of the thesis moves from the notion of language as representational to the focus on the ludic function of language games, and discusses whether these represent a retreat into a fantasy world or whether they have a subversive role. Finally, we will turn from the conscious humour of language games to the comedy of the unconscious, in which characters accidentally reveal more than they intend in their speech. The thesis concludes with a recognition of the extent to which recent critical theories may help inform our reading of the comic dramatist.

Lead (Pb) is a highly toxic metal even at low concentrations and is present in a great variety of soils both naturally and as a result of industrial activity. For this reason, knowing the actuation and tolerance or resistance mechanisms is of great importance to farming practices.In order to advance in this field of knowledge a series of experiments have been set up. From the results obtained, it is important to highlight that this metal, as well as other heavy metals, presents a barrier to translocation towards aerial parts that may be attributed to multiple causes such as lead binding to mucilage, its retention in cellular walls, its accumulation in the root's apoplast and simplast or in both radicular transportation ways. As was observed by root tip dying (fluorescent dyes).In our conditions of growth we have found that lead manifests itself in the length of the radicles even before the metal acts on the accumulation of dry matter. Its effects upon the length of the radicles could probably be a consequence of the effects upon cellular division in combination with effects on cellular wall extensibility. Many a dysfunction created by lead may be due to effects upon the integrity of the plasmatic membrane, as was observed by root tip dying (vital staining). By determining the hydraulic parameters through pressure probe techniques we were able to show that the mechanisms that govern the hydric behavior of this organ are complex and respond to many factors and that they do not obey to action upon the aquaporins. Exposing the root to different divalent metals makes it more vulnerable to attack by other heavy metals, as has been shown by the effects added by exposing the roots to HgCl2By using IRGA (infrared gas analyzer) techniques we have been able to show that lead at low concentrations may attack important physiological processes such as the photosynthetic activity of the plant, directly and or indirectly.By analyzing the contents of Pb in the plant, through the exude of xylem and the nutritive solution we were able to verify that the chelating agent EDTA may effectively reduce the toxicity of lead, while at the same time finding a mechanisms of Pb detoxification through the formation of a Pb complexes probably exuded by the roots that was also present in the translocated xylem solution. These results show that there are complex Pb detoxification mechanisms at different levels and in different plant physiological processes that need to be researched in greater depth the knowledge of which would be of great use in possible phytoremediation effects and in obtaining plant species capable of growing in Pb contaminated soils.Key words:detoxification, lead, root, phytotoxicity, fluorescent dyes, translocation, exude of xylem, pressure probe, compartimentation, vital staining, calcium.

How do we evaluate an enterprise¡¦s reasonable value? What would be the effective method? In the following research, I try to evaluate an enterprise¡¦s real value by four models: FCF model, EBO model, PB model, and PE model. Which model would generate the most accurate result and interpret the volatility of the stock market better? In addition, how effective are they? According to my research, the volatility of the stock price can be interpreted by the PB model best. PB model¡¦s R2 can reach as high as 76%. As for the accuracy, PE model can generate the most accurate estimation, whose tendency ratio is 34%. PB model, EBO model and FCF model rank the second, third and forth, respectively. The portfolios invested in accordance with the FCF model, EBO model, PB model, and PE model earn positive returns of 24%, 12%, 15% and 6%, respectively. Over half of the invested targets have positive return. In this period, the Taiwanese Stock Weighted Index fell from 8638.75 to 6142.32, generating a -29% of return. That is, the 4 evaluation models recommended by my research do have different results from the market. The market does not reflect the true value of the enterprises. Finally, I try to combine the enterprise evaluation models with the measurement of risk. The result shows that the penetration does not occur in FCF model and the variance- covariance model, while that occurs three times, four times and two times in the EBO model, PB model and PE model, respectively. Comparing the measured risk among all these models with the real risk, I find an average error 30.44% in the variance-covariance model, 20.26% in the FCF model, 8.11% in the EBO model, 10.91% in the PB model and 8.55% in the PE model. The risks measured by the enterprise evaluation models, have lower error. However, the risk measured by the variance-covariance model generates a 30.44% of error. As a result, measuring risks by the enterprise evaluation models is workable for the public.

The purposes of this study are to understand and compare: the distributions of the particulate and dissolved 210Po and 210Pb in the northern South China Sea and in the east and west sides of the Luzon Strait; the associated biogeochemical processes, including their mechanisms and rates involved in the area; and the disequilibrium between 226Ra and the 210Pb as observed in profiles. Seawater samples were collected from three stations in the northern South China Sea (station I, J, and F) and one station to the east of the Luzon Strait (station S5) using a Rosette sampling system during three Ocean Researcher I cruises (ORI-688 in July, 2003, ORI-707 in February, 2004, and ORI-734 in October, 2004). The dissolved 210Pb in surface water generally displays higher activities (around 14-28 dpm/100kg) relative to deep water, reflecting atmospheric input. The dissolved 210Pb profile as seen at station F displays a maximum of 26 dpm/100kg at 200 m and lower values at about 10 dpm/100kg below 1500 m. Highest value at 28 dpm/100kg was observed at S5 surface water. It is probably due to being on the path of the Kuroshio which has accumulated atmospheric 210Pb continually from the northern Equatorial Current on its way. The mean residence time with respect to particle scavenging is about 0.62 years for total 210Po within a 50 m mixed layer, and ranges between 0.34 to 1.13 years for total 210Pb in the mixed layer. 210Po is deficient relative to 210Pb in most profiles, suggesting that 210Po is more readily scavenged. The mean scavenging residence time is about 87 years for total 210Pb in the deep water at station F, and 60 years at station J. This residence time is longer than that in both the Pacific and East China Sea deep waters, i.e. a lower scavenging rate in the South China Sea. As the upwelling rate is much higher in the South China Sea than in the Pacific, it may effectively reduce the sinking rate of the sinking particulates, resulting in higher 210Pb residence time in the water columns of the South China Sea.

Po-210 and Pb-210 are particle-reactive natural radionuclides which can be removed from seawater by their incorporation with various particulate materials, resulting in radioactive disequilibria with respect to their parent nuclides. Previous studies showed that Po-210/Pb-210 activity ratio in surface seawater ranges from about 0.2 to 1 due to atmospheric input of Pb-210 and effects of biological productivity and upwelling. In order to evaluate the effects of plankton on Po-210 and Pb-210 distributions, plankton samples were collected by surface-trawling of plankton net in Taiwanese water. These plankton samples were analyzed for Po-210 and Pb-210 in order to obtain their concentrations and activity ratio, which may indicate the enrichment or discrimination of these nuclides in the marine planktonic phase around Taiwan. The results show that the Po-210/Pb-210 activity ratio of planktonic samples ranges from 23.06 to 51.40 in northeastern Taiwan, whereas the activity ratio in southwest Taiwan varies within and outside of the sampleing locations: stations 1, 2, 3 and 4 yield range of 10.72-43.90, 16.40-47.87, 13.86-23.37 and 9.35-13.82, respectively. Two marine algae (Sargassum polycystum C.Agardh and Hypnea charoides Lamouroux) yield values of 2.24-8.57, and 3.72-5.96, respectively. These Po-210/Pb-210 activity ratios are much greater than unity, and their activities comparison to those of inorganic particulates support the contention that the plankton preferentially incorporates Po-210 but discriminates against Pb-210. However, the mechanism or process of Po-210 to be incorporated in the plankton remains unclear. In comparison of the activities between Po-210 and Pb-210 in organic particulates, one finds that Po-210 is effectively enriched while Pb-210 is clearly discriminatied by the organic particulates. These results are consistent with those reported in literatures.

This thesis offers a Bakhtinian perspective on the operation of discourse in critical practice. Bakhtin's account of the individual's relation to language provides the basis for an examination of the ways in which discourse operates as a constraint upon and motive for acts of interpretation. In this my thesis breaks with the dominant use of Bakhtinian theory in which it is deployed as a means of analysing the operation of discourse in literary texts. In what follows I begin with an account of Bakhtin's sociolinguistics. Having established the theoretical framework for my analysis I move on to characterise the discourses of the heteroglossia in Britain in the period 1900 to 1930. For ease of analysis my account is divided into two sections. In the first of these the discourses operating at the societal level are discussed whilst the second section is concerned with the discourses which operated in literary critical circles at this time. In the third section of this work I offer an intermediate synthesis via an analysis of the operation of the discourses identified in preceding section in the practice of leading literary critics from this era. This section also enables me to offer a fuller account of the various discourses informing critical practice at this time. In the fourth section I examine the criticism generated by Joseph Conrad's Heart of Darkness in the period 1899 to 1930 and offer a detailed account of the ways in which the discourses identified in previous sections operate as constraints upon the act of criticism. More general works on Conrad from this period are also analysed. In my Conclusion I step back from the minutiae of critical practice and offer an account of some of the problems associated with adopting a Bakhtinian perspective on the processes of criticism. I end with a brief statement of the value of Bakhtinian theory as a basis for critical practice.

No sul do Brasil, zonas de cisalhamento tem um papel importante na geração e posicionamento de magmas graníticos e básicos. As zonas de cisalhamento transcorrentes Quitéria-Serra do Erval (ZCQSE) e Dorsal de Canguçu (ZCTDC) fazem parte do Cinturão de Cisalhamento Sul brasileiro (CCSb), uma descontinuidade formada no Neoproterozoico, que compreende zonas de cisalhamento kilométricas, anastomosadas, de escala crustal, com cinemática predominantemente transcorrente, e estão relacionadas com a construção de um extenso batólito de quase 1000 Km (650-575Ma). Seu desenvolvimento iniciou após a colisão principal (ca. 650 Ma) entre os cratons Rio de La Plata e Kalahari. A ZCQSE controlou o posicionamento do Granodiorito Cruzeiro do Sul (635Ma) e dos Diques Tardios granodioríticos a monzograníticos (605Ma), dos granitoides de afinidade tholetítica, Arroio Divisa (625Ma), e seu pulso mais evoluído, os Granitoide Sanga do Areal (620Ma). A presença de enclaves máficos contemporâneas com esses granitoides, indicam que fontes mantélicas foram ativas durante seus posicionamentos. Valores de ƐNd entre -3.32 a -10.93 e razões de 87Sr/86Sr(i) entre 0.7048 to 0.7223 obtidas para os granitoides da QSESZ sugerem fontes mantélicas com alguma componente crustal. Xenólitos das rochas encaixantes, como as do Complexo Arroio dos Ratos (2.14Ga), são interpretadas como parte da contaminação crustal. Os padrões geoquímicos dos granitoides da ZCQSE indicam fontes e processos de diferenciação similares para todas as unidades. Dados geocronológicos dos magmatismos shoshoniticos com idades entre 635 e 605 Ma definem o período mínimo de atividade tectônica e magmática da ZCQSE, assim como expandem o intervalo do magmatismo shoshonítico no sul do Brasil, indicando uma ativação precoce de fontes mantélicas no Batólito Pelotas. Estes magmatismos de natureza shoshonítica e tholeítica registram os estágios iniciais do CCSb (640 630Ma), em um ambiente pós-colisional, logo após a colisão principal (650Ma) no ciclo Brasiliano / Pan-Africano. Neste trabalho, complexos processos de fusão parcial de fontes mantélicas e crustais envolvendo influxo de água, fluxo de calor adicional através de injeções félsicas e máficas, mixing, mingling, e descompressão relacionada a atividade de zonas de cisalhamento durante mais de 30 Ma, são sugeridos. O magmatismo ao longo da ZCTDC teve seu início com o Granito Quitéria e foi seguido pelo Granito Arroio Francisquinho, o primeiro de derivação mantélica e o segundo de fusão crustal. Novos dados U-Pb SHRIMP do Granito Quitéria apontam uma idade de 634 Ma, interpretada como idade de cristalização. Para o Granito Arroio Francisquinho, a idade de cristalização obtida em monazita e nas bordas de zircões, foi cerca de 610 Ma. Estas idades definem o período principal da atividade tectônica e magmática da ZCTDC. Uma compilação extensiva de dados isotópicos do magmatismo dentro e fora dos três batólitos que compõe o CCSb e do seu embasamento, permitiu estimar o intervalo do magamtismo pós-colisional no sul do Brasil entre 640 e 560Ma, e o intervalo dos picos termais causados por esse magmatismo no embasamento, entre 650 e 560 Ma. As idades de cristalização, heranças e os dados de Sr-Nd compilados, levaram a conclusão que estes três segmentos devem ser tratados como um único batólito. / Crustal-scale shear zones play an important role in the generation and emplacement of granitic and basic magmatism within the Neoproterozoic post-collisional setting of southern Brazil. The strike-slip Quitéria-Serra do Erval Shear Zone (QSESZ) and the Dorsal de Canguçu Transcurrent Shear Zone (DCTSZ) are part of the Southern Brazilian Shear Belt (SBSB), a major crustal discontinuity formed in the Neoproterozoic, which comprises several km-wide, anastomosing shear zones of dominantly transcurrent kinematics and is related with the building of an extensive, nearly 1000 km long batholith (650-575Ma). Its development is thought to have initiated after the main collision (ca. 650 Ma) between the Río de la Plata and Kalahari cratons. The QSESZ has controlled the emplacement of the shoshonitic Cruzeiro do Sul Granodiorite (635Ma) and late granodiorite to monzogranite dikes (Late Dikes, 605Ma), the tholeiitic Arroio Divisa granitoids (625Ma) and its more evolved pulse, the Sanga do Areal (620Ma). The presence of mafic rocks coeval with each of these granite magmas, found as mingled mafic enclaves, indicates that mantle sources were active during their emplacement. ƐNd values of -3.32 to -10.93 and 87Sr/86Sr(i) ratios from 0.7048 to 0.7223 obtained for the QSESZ granitoids suggest mantle sources with some evolved sources such as old continental crust. Host-rock xenoliths of the Paleoproterozoic Arroio dos Ratos Complex (2.14 Ga) are interpreted as crustal contaminants. Geochemical trends indicate similar sources and processes of differentiation for the QSESZ granitoids. Geochronological data of the QSESZ shoshonitic magmatisms indicates ages between 635 and 605 Ma and defines the minimum period of magmatic and tectonic activity of the Quitéria-Serra do Erval Shear Zone, as well as expand the time span for the shoshonitic magmatism in southern Brazil indicating an early activation of mantle sources in the Pelotas Batholith. These magmatisms of shoshonitic and tholeiitic nature records the initial stages of the SBSB (640 - 630Ma) in a post-collisional period, just after the Brasiliano / Pan-African main collisional event (650Ma). A complex process of partial melting of mantle and crustal sources involving water influx, additional heat flux from felsic and mafic injections, mixing, mingling and decompression related to the shear zone activity over 30 Ma duration is suggested. Magmatism emplaced along the DCTSZ has started with the mantle-derived Quitéria Granite and was followed by crustal melts such as the Arroio Francisquinho Granite (AFG). New U-Pb SHRIMP zircon data from the Quitéria Granite yielded a value of 634 Ma, interpreted as its crystallization age. The AFG crystallization age obtained in monazite, and zircon outer rims is ca. 610 Ma. The ages of these granites define the main period of coeval tectonic and magmatic activity of the DCTSZ. An extensive isotope data compilation of the magmatism within and outside the SBSB three batholith segments and its basement allows to estimate the time span of postcollisional magmatism in southern Brazil from 640 to 560 Ma, and the interval of the main thermal effects on the basement between 650 and 560 Ma. The crystallization/inherited ages and the Sr-Nd isotope data, lead to conclude that three segments should be addressed as a single batholith.