The Himalaya provide the most significant example of present-day orogenesis and consequently have been extensively studied to gain an understanding of the principle controls on the response of the crust to continental collision. However, our understanding of the prograde metamorphic evolution of the orogen remains poor. This thesis builds on recent advances in the study of PTt paths, using garnet chronometry, to better constrain the thennobarometric evolution of the Garhwal section of the Indian Himalaya. Results show that the metamorphic core of the Garhwal Himalaya - the High Himalayan Crystalline Series (HHCS) - records a complex, continuous prograde thermal history from initial burial -10 Ma after continental collision at -50 Ma, up to cooling and exhumation at 20-16 Ma BP. PT paths obtained from garnets indicate that prograde metamorphism occurred during crustal thickening and "peak" thermobarometric estimates show that the presently exposed HHCS records temperatures of -700 °C throughout the section accompanied by a decrease in pressures from --13 kbar at the base to -6 kbar at the top. However, chronometric information shows that reorganisation of the orogenic wedge resulted in the juxtaposition of rocks which attained different PT conditions at different times and places during orogenesis. Additionally, temperatures were sufficient in the early stages of orogenesis for the development of small leucogranitic bodies to form by fluid-present melting. The HHCS in Garhwal, therefore, cannot be considered as a single coherent crustal slice. Furthermore, the continued reorganisation of the orogen since collision also means the heat generation within the overthickened orogenic wedge is sufficient for anatexis of the crust to form the well-studied melts intruding the upper levels of the HHCS. However, interpretation of the results is complicated by the isotopic systematics involved in garnet chronometry and by the role of small inclusions with high concentrations of the critical elements of- Nd, Pb, Sr. The systematics of the Sm-Nd system in garnet has been investigated by a comparison of concentrations obtained insitu by LA-ICP-MS with those obtained by isotope dilution. Results show that while such inclusions can pose a problem to chronometry, their effects can be identified and constrained. In the course of such work data was obtained on the trace-element zonation in garnet, which acts as a monitor of the chemical evolution of the rock. While the controls on such zonation are still poorly understood the data presented here emphasise the importance of fractionation of the chemical system from which the garnet grows by both accessory minerals and by garnet itself. Furthermore, different minerals fractionate distinctly different elements this can be recognised in the trace-element zonation preserved in garnet.

No description available.

The main objective of this work was to understand fundamental processes related to incipient continental collision through studying the tectonostratigraphic evolution of Cyprus, in its Easternmost Mediterranean context. This was achieved by compiling structural, sedimentological and stratigraphic evidence from Late Cenozoic to Recent sequences, and by applying palaeomagnetic and luminescence methods of dating. In particular, the basin-fill of the Neogene basins provides a temporal and palaeogeographic control to interpret syn-depositional and post-depositional structural assemblages. Four neotectonic deformation phases are recognised. The Polis and Pissouri Basins originated as Tortonian depocentres in response to syn-depositional W-E/WSW-ENE D1 extension. The Maroni Basin originated as a Tortonian depocentre in response to syn-depositional NW-SE D1 extension. The difference in extension direction between west and south-central Cyprus is attributed to the curvature of the Cyprus Arc. The Middle - Late Pliocene D2 extensional/transtensional phase re-orientated the Neogene basins and resulted in syn-depositional NW-SE extension. A kinematic change occurred at ~3 Ma, attributed to the collision of the Eratosthenes Seamount with an active trench, the ‘Cyprus Arc’. Early Pleistocene to Recent D3a transpression generated strike-slip faulting along E-W trends, conjugate left-lateral NNE-SSW-trending and right-lateral NNW-SSE-trending strike-slip faults and reactivated Tortonian D1 NW-SE and NE-SW structures. Middle Pleistocene to Recent D3b compression produced intense NE-SW contractional deformation orientated along NW-SE trends. Optically stimulated luminescence (OSL) dating was used as a tool to constrain the D3a/D3b events, by generating a chronology for their associated sediments. D3 transtensional lineaments originated in the early Pleistocene (174.1 ± 20.9 ka < D3a < 76.6 ± 16.43 ka), and are still active today (Cape Kiti: 38.1 ± 13.2 ka < D3a < 12.1 ± 0.1 ka). D3 compressional lineaments originated in the middle Pleistocene, and were still actively growing at 76.8 ± 31.6 ka. To constrain the timing of regional uplift in south and central Cyprus, a magnetostratigraphy was generated for the Plio-Pleistocene units of the Pissouri and Mesaoria Basins. The results indicate that rapid uplift began in the latest Pliocene (c. 2.14 – 1.95 Ma), coincident with the large-scale progradation of Gilbert-type fan deltas into the Pissouri Basin, and the incursion of large fluvial networks into the Mesaoria Basin. In light of the new evidence, three alternative models for the Early Cenozoic to Recent tectonostratigraphic evolution of Cyprus are considered: model 1, subduction/incipient collision; model 2, advanced collision; and model 3, transpression. Some difficulties exist in detail, with all three models. However, at present the working hypothesis is as follows: areas to the east of Cyprus (Syria, S Turkey) were in a collisional setting from Mid-Miocene time onwards. Cyprus remained in an oceanic embayment (Levant Sea) further west and subduction continued during Miocene time. Compressional processes may have been active at depth during this time. Southward extension (trench roll-back) was taking place at a high structural level in S Cyprus, as with many other convergent margin settings (e.g. SW Peloponnese; Aleutians; Sunda arc). Subsequently, the collision of the Eratosthenes Seamount with the Cyprus Arc obstructed subduction and initiated rapid uplift of the Troodos Massif. The initial manifestation of this kinematic change was the generation of E-W-trending strike-slip faults and the development of conjugate left-lateral NNE-SSW-trending and right-lateral NNW-SSE-trending strike-slip faults. Transpression resulted in the reactivation of D1/D2 E-W, NE-SW and NW-SE structures. Subsequent deformation is documented in a compressional lineament in SW Cyprus. In addition, the over-riding plate in southwest Cyprus still appears to be undergoing gravity spreading outwards from the developing collision zone.

The elucidation of the geologic processes that led to the creation of the Tibetan Plateau, a large area of thick crust and high elevation, is a fundamental question in geology. This study provides new data and insight on the geologic history of central Tibet in the Jurassic and Cretaceous, prior to the Indo-Asian collision, as well as the Gondwanan history of the Lhasa and Qiangtang terranes of the plateau. This investigation is centered on the Bangong suture zone near the town of Amdo and I present new geochronology, thermochronology, thermobarometry and structural data of the Amdo basement, an exposure of high-grade gneisses and intrusive granitoids. Using a range of thermochronometers, I show there were two periods of cooling, one in the Middle-Late Jurassic after high-grade metamorphism and a second in the Early Cretaceous. I attribute Middle-Late Jurassic metamorphism, magmatism, and initial cooling of the Amdo basement to arc related tectonism that resulted in tectonic or sedimentary burial of the magmatic arc. I propose that a second period of cooling, nonmarine, clastic sedimment deposition and thrust faulting in the Early Cretaceous is related to the Lhasa-Qiangtang collision. The thermochronology reveals limited denudation between the Cretaceous and the present, indicating the existence of thickened crust when India collided with Asia in the early Tertiary. U-Pb geochronology of the orthogneisses and detrital zircon geochronology of metasedimentary rocks suggests that the Lhasa and Qiangtang terrane were located farther west along Gondwanan's northern margin than most reconstructions depict.

In central Anatolia, Turkey, a strand of the former northern Neotethys Ocean subducted northwards under the Eurasian (Pontide) active margin during Late Cretaceous–Early Cenozoic time. Subduction and regional plate convergence were associated with the generation and emplacement of accretionary complexes and supra-subduction zone-type ophiolites onto former passive margins of microcontinents. The resultant suture zones contain Late Cretaceous to Middle Eocene basins (“The Central Anatolian Basins”) including: 1) the Kırıkkale Basin; 2) the Çankırı Basin, 3) the Tuz Gölü Basin and; 4) the Haymana - Polatlı Basin. Using stratigraphic logging, igneous geochemistry, micropalaeontology and provenance studies, this study tests two end-member models of basin evolution. In model one, the basins developed on obducted ophiolitic nappes following closure of a single northern Neotethys Ocean during the latest Cretaceous. In model two, northern Neotethys comprised two oceanic strands, the İzmir-Ankara-Erzincan Ocean to the north and the Inner Tauride Ocean to the south, separated by the Niğde-Kırşehir microcontinent, which was rifted from the Gondwana continent to the south. In this scenario, the basins developed as accretionary-type basins, associated with north-dipping subduction which persisted until the Middle Eocene when continental collision occurred. Where exposed, the basements of the Central Anatolian Basins comprise the Ankara Mélange, a mainly Upper Cretaceous subduction-accretion complex and the western/northern margin of the Niğde-Kırşehir microcontinent. New geochemical data from the composite basement of the Kırıkkale Basin identify mid ocean-ridge basalt (MORB), here interpreted to represent relict Upper Cretaceous Neotethyan oceanic crust. During the latest Cretaceous, the Kırıkkale and Tuz Gölü Basins initiated in deep water above relict MORB crust and ophiolitic mélange, bordered by the Niğde-Kırşehir microcontinent to the east where marginal facies accumulated. Further west, the Haymana-Polatlı Basin represents an accretionary-type basin constructed on the Ankara Mélange. To the north, the Çankırı Basin developed on accretionary mélange, bounded by the Pontide active margin to the north. Palaeocene sedimentation was dominated by marginal coralgal reef facies and siliciclastic turbidites. Latest Palaeocene–middle Eocene facies include shelf-type Nummulitid limestone, shallow-marine deltaic pebbly sandstones and siliciclastic turbidites. This thesis proposes a new model in which two north-dipping subduction zones were active during the late Mesozoic within northern Neotethys. In the south, ophiolites formed above a subduction zone consuming the Inner Tauride Ocean until the southward retreating trench collided with the northern margin of the Tauride continent emplacing ophiolites and mélange. In the north, subduction initiated outboard of the Eurasian margin triggering the genesis of supra-subduction zone ophiolites; the subduction zone rolled back southwards until it collided with the Niğde-Kırşehir microcontinent, again emplacing ophiolites during latest Cretaceous time. Neotethyan MORB still remained to the west of the Niğde-Kırşehir microcontinent forming the basement of the Kırıkkale and Tuz Gölü Basins. Latest Palaeocene–middle Eocene regional convergence culminated in crustal thickening, folding, uplift and strike-slip faulting which represent final continental collision and the geotectonic assembly of central Anatolia.

京都大学 / 新制・課程博士 / 博士(理学) / 甲第23018号 / 理博第4695号 / 新制||理||1673(附属図書館) / 京都大学大学院理学研究科地球惑星科学専攻 / (主査)准教授 河上 哲生, 教授 田上 高広, 教授 下林 典正 / 学位規則第4条第1項該当 / Doctor of Science / Kyoto University / DFAM

Systeme von Vorlandbecken repräsentieren bedeutende geologische Archive und dienen dem Verständnis von Rückkopplungen zwischen oberflächennahen und tektonischen Prozessen. Außerdem dokumentieren sie die Entwicklung unmittelbar angrenzender Bergketten. Die sedimentären Abfolgen in Vorlandbecken reflektieren das Gleichgewicht zwischen tektonischer Subsidenz, der Bildung langzeitlichen Akkommodationsraumes und des Sedimenteintrages, welcher wiederum die Wirksamkeit von Erosions- und Massenneuverteilungsprozessen wiederspiegelt. Um die Effekte von Klima und Tektonik in einem solchen System zu erforschen, untersuchte ich die Oligo-Miozänen Sedimente in den Vorlandbecken der südlichen Elburs Bergkette, einem intrakontinentalen Gebirge in Nord-Iran, das im Zuge der Arabisch-Eurasischen Kontinent-Kollision herausgehoben wurde. In dieser Studie der Vorlandbeckensedimente wurden Datierungstechniken angewandt (40Ar/39Ar, (U-Th)/He Thermochronologie und Magnetostratigraphie), die Sedimente und deren Herkunft analysiert und die Tonmineralogie, sowie Sauerstoff- und Kohlenstoffisotope untersucht. Die Ergebnisse zeigen, dass auf einer Zeitskala von 105 bis 106 Jahren eine systematische Korrelation zwischen „coarsening upward“ Zyklen und den sedimentären Akkumulationsraten besteht. Während sukzessiver Überschiebungsphasen werden die durch Hebung der Bergkette bereitgestellten groben Kornfraktionen in proximale Bereiche des Beckens geliefert und feinkörnige Fazies in distalen Beckenregionen abgelagert. Variationen in der Sedimentherkunft in Phasen größerer tektonischer Aktivität zeugen von erosionaler Abdeckung und/oder der Umorganisation natürlicher Entwässerungsstrukturen. Außerdem zeigen die Untersuchungen an stabilen Isotopen, dass die verstärkte tektonische Aktivität das Anwachsen der Topographie förderte und damit die Wirksamkeit einer topographischen Barriere erhöhte. Wenn aufgrund nachlassender Beckenabsenkung die grobe Kornfraktion nicht vollständig im Nahbereich des Beckens aufgenommen werden kann breitet sie sich in ferne Beckenregionen aus. Im Elburs wird die verringerte Subsidenz durch eine interne Hebung des Vorlandes hervorgerufen und ist mit einer lateralen Stapelung von Flussbetten assoziiert. Dokumentiert wird dies anhand konsequenten Schichtwachstums, tektonischer Schrägstellung und sedimentärer Umlagerung. Gleichzeitig nehmen die Sedimentationsraten zu. Die Sauerstoff-Isotope der Paläoböden zeigen, dass dieser Anstieg mit einer Phase feuchteren Klimas einhergeht, wodurch Oberflächenprozesse effizienter werden und Heraushebungssraten steigen, was eine positive Rückkopplung erzeugt. Des Weiteren zeigen die isotopischen und sedimentären Daten, dass seit 10-9 Millionen Jahren (Ma) das Klima durch saisonalen Anstieg der Niederschläge zunehmend feuchter wurde. Da bedeutende klimatische Veränderungen zu dieser Zeit auch im Mittelmeerraum und Asien beobachtet wurden, ist anzunehmen, dass die klimatische Veränderung, die im Elburs Gebirge beobachtet wird, höchstwahrscheinlich Änderungen der atmosphärischen Zirkulationen der nördlichen Hemisphäre reflektiert. Aus den Ergebnissen dieser Studie lassen sich zusätzliche Implikationen für die Entwicklung des Elburs Gebirges und die Arabisch-Eurasische kontinentale Kollisionszone ableiten. Die orogen-weite Hauptdeformation propagierte nicht gleichmäßig nach Süden, sondern seit dem Oligozän schrittweise vorwärts und rückwärts. Insbesondere von ~17,5 bis 6,2 Ma wurde das Gebirge durch eine Kombination aus frontaler Akkretion und interner Keildeformation in Schritten von 0,7 bis 2 Millionen Jahren herausgehoben. Darüber hinaus deuten die Sedimentherkunftsdaten darauf hin, dass sich noch vor 10-9 Ma die Haupteinengungsrichtung von NW-SE nach NNE-SSW veränderte. Regional erlaubt die Geschichte der untersuchten Becken und angrenzenden Gebirgszüge Rückschlüsse auf ein neues geodynamisches Model zur Entwicklung der Arabisch-Eurasischen kontinentalen Kollisionszone. Zahlreiche Sedimentbecken des Elburs Gebirges und anderer Lokalitäten der Arabisch-Eurasischen Deformationszone belegen einen Wechsel von einem tensionalen zu einem kompressionalen tektonischen Regime vor ~36 Ma . Dieser Wechsel könnte den Beginn der Subduktion von gedehnter arabischer kontinentaler Lithosphäre unter Zentral-Iran bedeuten, was zu einer moderaten Plattenkopplung und Deformation von Unter- sowie Oberplatte geführt hat. Der Anstieg der Deformationsraten im südlichen Elburs Gebirge seit ~17,5 Ma lässt vermuten, dass die Oberplatte, wahrscheinlich aufgrund steigender Plattenkopplung, seit dem frühen Miozän signifikant deformiert wurde. Diese Veränderung könnte der Subduktion mächtigerer arabischer kontinentaler Lithosphäre zugeschrieben werden und den Anfang echter kontinentaler Kollision bedeuten. Dieses Model erklärt daher die Zeitverzögerung zwischen der Initiation der Arabisch-Eurasischen kontinentalen Kollision (Eozän-Oligozän) and dem Beginn ausgedehnter Deformation in der Kollisionszone (Miozän). / Foreland-basin systems are excellent archives to decipher the feedbacks between surface and tectonic processes in orogens. The sedimentary architecture of a foreland-basin system reflects the balance between tectonic subsidence causing long-term accommodation space and sediment influx corresponding to efficiency of erosion and mass-redistribution processes. In order to explore the effects of climatic and tectonic forcing in such a system, I investigated the Oligo-Miocene foreland-basin sediments of the southern Alborz mountains, an intracontinental orogen in northern Iran, related to the Arabia-Eurasia continental collision. This work includes absolute dating methods such as 40Ar/39Ar and zircon (U-Th)/He thermochronology, magnetostratigraphy, sedimentological analysis, sandstone and conglomerate provenance study, carbon and oxygen isotope analysis, and clay mineralogy study. Results show a systematic correlation between coarsening-upward cycles and sediment accumulation rates in the basin on 105 to 106yr time scales. During thrust loading phases, the coarse-grained fraction supplied by the uplifting range is stored in the proximal part of the basin (sedimentary facies retrogradation), while fine-grained sediments are deposited in distal sectors. Variations in sediment provenance during these phases of enhanced tectonic activity give evidence for erosional unroofing phases and/or drainage-reorganization events. In addition, enhanced tectonic activity promoted the growth of topography and associated orographic barrier effects, as demonstrated by sedimentologic indicators and the analysis of stable C and O isotopes from calcareous paleosols and lacustrine/palustrine samples. Extensive progradation of coarse-grained deposits occurs during phases of decreased subsidence, when the coarse-grained fraction supplied by the uplifting range cannot be completely stored in the proximal part of the basin. In this environment, a reduction in basin subsidence is associated with laterally stacked fluvial channel deposits, and is related to intra-foreland uplift, as documented by growth strata, tectonic tilting, and sediment reworking. Increase in sediment accumulation rate associated with progradation of vertically-stacked coarse-grained fluvial channels also occurs. Paleosol O-isotope data shows that this increase is related to wetter climatic phases, suggesting that surface processes are more efficient and exhumation rates increase, giving rise to a positive feedback. Furthermore, isotopic and sedimentologic data show that starting from 10-9 Ma, climate became less arid with an increase in seasonality of precipitation. Because important changes were also recorded in the Mediterranean Sea and Asia at that time, the evidence for climatic variability observed in the Alborz mountains most likely reflects changes in Northern Hemisphere atmospheric circulation patterns. This study has additional implications for the evolution of the Alborz mountains and the Arabia-Eurasia continental collision zone. At the orogenic scale, the locus of deformation did not move steadily southward, but stepped forward and backward since Oligocene time. In particular, from ~ 17.5 to 6.2 Ma the orogen grew by a combination of frontal accretion and wedge-internal deformation on time scales of ca. 0.7 to 2 m.y. Moreover, the provenance data suggest that prior to 10-9 Ma the shortening direction changed from NW-SE to NNE-SSW, in agreement with structural data. On the scale of the entire collision zone, the evolution of the studied basins and adjacent mountain ranges suggests a new geodynamic model for the evolution of the Arabia-Eurasia continental collision zone. Numerous sedimentary basins in the Alborz mountains and in other locations of the Arabia-Eurasia collision zone record a change from a tensional (transtensional) to a compressional (transpressional) tectonic setting by ~ 36 Ma. I interpret this to reflect the onset of subduction of the stretched Arabian continental lithosphere beneath central Iran, leading to moderate plate coupling and lower- and upper-plate deformation (soft continental collision). The increase in deformation rates in the southern Alborz mountains from ~ 17.5 Ma suggests that significant upper-plate deformation must have started by the early Miocene most likely in response to an increase in degree of plate coupling. I suggest that this was related to the subduction of thicker Arabian continental lithosphere and the consequent onset of hard continental collision. This model reconciles the apparent lag time of 15-20 m.y between the late Eocene to early Oligocene age for the initial Arabia-Eurasia continental collision and the onset of widespread deformation across the collision zone to the north in early to late Miocene time.

La convergence entre l'Arabie et l'Eurasie est accommodée à l'intérieur du territoire iranien. Nous présentons des champs de vitesse GPS denses couvrant une grande partie de l'Iran (Zagros, block de Lut et Kopeh Dagh) avec des précisions meilleures que 2 mm/an.<br />Dans le Zagros, la convergence est accommodée par du partitionnement dans la partie nord. 2-4 mm/an de décrochement dextre sur la MRF sont transférés sur les failles de Dena, Kazerun et Kareh Bas dans le système de failles de Kazerun, se déplaçant à 3-4 mm/an chacune. Dans le Zagros Central, 8 mm/an de raccourcissement sont concentrés près du Golf Persique, contrastant avec une sismicité plus distribuée et indiquant un découplage de la déformation superficielle du socle.<br />A l'est de l'Iran, entre le block central Iranien et le block de Hellmand, 14 mm/an de cisaillement dextre orienté NS sont observés au travers du block de Lut, avec 6.5 mm/an absorbés à l'ouest (failles de Bam, Gowk et Sabzevaran) et 7.5 mm/an à l'est (zone de suture de Sistan). Des failles majeures senestres orientées EW au nord du block de Lut accommodent une partie du cisaillement (Dasht-e-Bayaz 1.5 mm/an, Doruneh 2.5 mm/an). Au sud de la chaîne du Kopeh Dagh 8 mm/an de cisaillement persistent, dont 3.5 et 2.5 mm/an sont absorbés par du raccourcissement NS dans le Binalud et l'est Kopeh Dagh, 5 mm/an par du décrochement dextre au travers le système de failles de Quchan, et 5-8 mm/an par l'expulsion du basin Sud Caspien vers l'ouest.<br />La comparaison des taux de glissement actuels avec des taux géologiques court et long terme montre une évolution complexe des activités des failles même dans le contexte de collision continental récente de l'Iran.

L’Anatolie fait partie d’un vaste domaine orogénique qui s’étend des Alpes à l’Himalaya. Les sutures ophiolitiques rencontrées marquent les cicatrices de plusieurs domaines océaniques (branches de la Néotéthys Nord), interdigités entre plusieurs blocs crustaux au cours du Mésozoïque. La fermeture de ces domaines au Crétacé supérieur est accompagnée de la mise en place de bassins tertiaires syn-orogéniques dont fait partie le Bassin de Sivas, limité au nord par le bloc du Kırşehir et au Sud par les Taurides. Une étude structurale de terrain, complétée d’analyses géochimiques, biostratigraphiques et thermochronologiques ainsi que l’étude de 700 km de lignes sismiques 2D inédites, a été menée pour tenter de comprendre (i) le contexte géodynamique régional et (ii) l’architecture tectono-sédimentaire de ce bassin.L’étude des ophiolites présentes le long de la bordure sud du Bassin de Sivas met en évidence des péridotites intensément serpentinisées. La partie supérieure de l’ophiolite présente des brèches et ophicalcites caractéristiques de l’exhumation mantellique, alors que l’analyse géochimique des corps magmatiques révèle un environnement de supra-subduction, daté à circa 90 Ma (U-Pb sur zircon). Ces analyses démontrent la présence d’un domaine océanique embryonnaire entre le Kırşehir et les Taurides, dont la fermeture s’initie le long d’ancienne failles de détachement. L’obduction de la nappe de péridotite et de son mélange frontal sur la marge Nord des Taurides entre le Turonien et le Maastrichtien, permet de former le « socle ophiolitique » commun aux bassins est-anatoliens. L’analyse détaillée de la partie centrale du bassin, en carte et à l’aide de lignes sismiques 2D inédites et de thermochronologie basse température [AFTA et (U-Th)/sur apatite], a permis de proposer un modèle d’évolution cinématique sur la base de coupes équilibrées. La propagation de la déformation vers le Nord, initiée dès l’Eocène inférieur, permet l’isolation progressive du bassin et une forte accumulation d’évaporites à l’Eocène supérieur. Les dépôts de l’Oligo-miocène sont ensuite contrôlés par l’halocinèse, permettant la mise en place de deux générations de mini-bassins salifère, séparés d’une canopée. Les géométries dans le domaine halocinétique, et les variations latérales dans le bassin, montrent le contrôle exercé par (i) le bassin pré-évaporite affleurant le long de la moitié sud du bassin et (ii) l’épaisseur du niveau de sel initial.L’intégration de ces observations à l’échelle régionale met en évidence un contrôle du raccourcissement crustal, dans les Taurides et les bassins tertiaires, lié à la fermeture de la Néotéthys Sud, en générant l’émergence de structures de socles. La collision enregistrée à l’Oligocène supérieur - Miocène lors de l’indentation de la plaque Arabe le long des Taurides est contemporaine de la déformation du Bassin de Sivas et des bassins adjacents. / Anatolia is part of a vast orogenic domain that extends from the Alps to the Himalayas. Numerous ophiolitic sutures defined the remnants of several oceanic domains (Northern and southern Neotethys), between continental fragments formed during Mesozoic time. Oceanic closure during Late Cretaceous is recorded by the establishment of syn-orogenic tertiary basins, including the Sivas Basin bounded to the north by the Kırşehir block and to the south by the Taurides. An extended study based on field and completed by geochemistry, biostratigraphy and thermochronology analyzes and more than 700 km unpublished seismic data, was conducted to resolve (i) the regional geodynamic context and (ii) the tectono-sedimentary architecture of this basin.The ophiolites located along the southern edge of the Sivas Basin are made of serpentinized peridotites. The upper part of the ophiolite present breccias and ophicalcites commonly described as associated to mantle exhumation environment, while the geochemical analysis of the magmatic bodies reveals a supra-subduction environment dated at circa 90 Ma (U-Pb on zircon). These observations are in agreement with an embryonic ocean domain located between the Kırşehir and the Taurides, the closure which was initiated along fossil detachment faults. The obduction of the peridotite nappe and its frontal mélange on the northern margin of the Taurides between the Turonian and the Maastrichtian allows forming the “ophiolitic basement” of the east-anatolian basins.A detailed map and cross-section analysis, supported by 2D seismic lines and low-temperature thermochronology [AFTA and (U-Th) / on apatite], resulted in a kinematic evolution model and the realization of balanced cross-sections. The propagation of the deformation towards the north, initiated in the Lower Eocene, results in the progressive isolation of the basin and a strong accumulation of evaporites during the Upper Eocene. The Oligo-Miocene depocenters were controlled by halokinesis, forming two generations of mini-basins, separated by a salt canopy. The geometries in the halokinetic domain and the lateral variations in the basin show the control exerted by (i) the pre-evaporite basin outcropping along the southern half of the basin and (ii) the thickness of the initial salt level.Integration at the regional scale within the Taurides highlights the propagation of crustal shortening related to the Southern Neotethys closure, which formed linear tectonic basement exhumation. The collision recorded in the Upper Oligocene - Miocene during the indentation of the Arabic plate along the Taurides is contemporaneous to the deformation the Sivas Basin.