Palaeozoic orogeneses around the Siberian craton: Structure and evolution of the Patom belt and foredeep

Boisgrollier, T. De; Petit, Carole; Fournier, Marc; Leturmy, Pascale; Ringenbach, Jean‐Claude; Sankov, V. A.; Анисимова, С. В.; Коваленко, С. Н.

doi:10.1029/2007tc002210

Cited by 13 publications

(6 citation statements)

References 45 publications

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“…18B). This major shortening corroborates the NW-SE oriented collisional event in the area of the Patom belt in southern Siberia as shown in structural studies of Delvaux andothers (1995) andde Boisgrollier andothers (2009). NW-SE collision between Siberia and the northern part of the Tuva-Mongol continental block was coeval with E-W compressive deformation in the south, implying westward drift of the Tuva-Mongol ribbon (fig.…”

Section: Late Devonian To Carboniferous E-w Convergence and Emplaceme...supporting

confidence: 84%

Structural constraints on the evolution of the Central Asian Orogenic Belt in SW Mongolia

Lehmann¹,

Schulmann²,

Lexa³

et al. 2010

American Journal of Science

194

160

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International audienceWe provide a detailed description of the structures along a 300 km long and 50 km wide transect across the Central Asian Orogenic Belt (CAOB) in southwestern Mongolia, covering the Precambrian Dzabkhan continental domain with overthrust Neoproterozoic ophiolites in the north (Lake Zone), a Silurian-Devonian passive margin association (Gobi-Altai Zone) and oceanic domain (Trans-Altai Zone) in the center, and a continental area (South Gobi Zone) in the south. Structural analysis suggests late Cambrian collapse of the thickened Lake Zone continental crust, leading to stretching of the lithosphere and followed by Silurian-Devonian formation of oceanic crust in the Trans-Altai domain. Subsequent emplacement of Devonian-Carboniferous and late Carboniferous magmatic arcs occurred on the Gobi-Altai and South Gobi Zone crusts, respectively, during E-W shortening. Finally, the entire system was affected by N-S convergence from the Permian to Jurassic, leading to heterogeneous shortening of the orogenic domain. The model best fitting these observations is one of generalized westward drift of the Tuva-Mongol-Dzabkhan-Baydrag ribbon continents during the Silurian-Devonian, associated with westward-subduction of the Mongol-Okhotsk Ocean and sequential growth of syn-convergent magmatic arcs. Back-arc basins opened during this period in the area of the western Paleoasian Ocean. The present-day shape of the CAOB in southern Mongolia was probably formed during Permian to Mesozoic anticlockwise rotation and folding of the Tuva-Mongol-Dzabkhan-Baydrag continental ribbons, combined with a strike-slip (transpressional) reactivation of ancient transform boundaries in the Paleoasian oceanic domain. All continental and oceanic crustal domains were reactivated and intensely deformed during this convergence in a style controlled by crustal rheology and a heterogeneous Permian magmatic-thermal input. The sequence of tectonic events is tested against published paleomagnetic data, paleogeographic reconstructions and tectonic models, leading to a revised model for the accretion of juvenile crust to a continental margin in the CAOB of southern Mongolia

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Section: Late Devonian To Carboniferous E-w Convergence and Emplaceme...supporting

confidence: 84%

Structural constraints on the evolution of the Central Asian Orogenic Belt in SW Mongolia

Lehmann¹,

Schulmann²,

Lexa³

et al. 2010

American Journal of Science

194

160

View full text Add to dashboard Cite

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“…By that time (circa 360–350 Ma) sample BA10 collected well inside the platform is covered by about 3 km of sediments whereas sample BA09 located closer to the Baikal and Patom ranges is covered by about 4 km of sediments (Figure 6). This ∼100 Ma subsidence episode is coeval with the beginning of accretion of the remote Tuva‐Mongolia (Late Cambrian–Early Ordovician) and Khamar‐Daban blocks (Late Silurian–Early Devonian) [ Fedorovskii et al , 1993; Zorin et al , 1993; Gibsher et al , 1993; Delvaux et al , 1995a; Gusev and Khain , 1996] and predates the onset of compressional deformation in the outer Patom region [ de Boisgrollier et al , 2009].…”

Section: Discussionmentioning

confidence: 99%

How old is the Baikal Rift Zone? Insight from apatite fission track thermochronology

et al. 2009

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[1] Apatite fission track analysis (AFTA) data are used to bring new light on the long-term and recent history of the Baikal rift region (Siberia). We describe the evolution of the topography along a NW-SE profile from the Siberian platform to the Barguzin range across the Baikal-southern Patom range and the northern termination of Lake Baikal. Our results show that the Baikal-Patom range started to form in the Early Carboniferous and was reactivated in Middle Jurassic-Lower Cretaceous times during the orogenic collapse of the Mongol-Okhotsk belt. Samples located in the Siberian platform recorded a continuous sedimentation up to the early Carboniferous but remain unaffected by later tectonic episodes. The Barguzin basin probably started to form as early as Late Cretaceous, suggesting a continuum of deformation between the postorogenic collapse and the opening of the Baikal Rift System (BRS). The initial driving mechanism for the opening of the BRS is thus independent from the India-Asia collision. AFTA show a late Miocene-early Pliocene increase in tectonic extension in the BRS that confirms previous thoughts and might reflect the first significant effect of the stress field generated by the India-Asia collision.Citation: Jolivet, M., T.

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“…The thickness of Cenozoic sediments reaches maximum values of 8–9 km in the South‐Centre Baikal and decreases northward up to ∼4.5 km in the North Baikal (Figure 1) [ Hutchinson et al , 1992; Petit and Déverchère , 2006]. To the northeast of Lake Baikal, the northern rift domain develops farther from the preexisting suture trace on map, within the Sayan‐Baikal fold belt [ de Boisgrollier et al , 2009]. Deformation in this area is distributed over a larger area characterized by the presence of shorter, still largely asymmetric en echelon basins developed within the Sayan‐Baikal mobile belt [ Logatchev and Florensov , 1978; Logatchev and Zorin , 1992].…”

Section: Tectonic Settingmentioning

confidence: 99%

Controls of lithospheric structure and plate kinematics on rift architecture and evolution: An experimental modeling of the Baikal rift

et al. 2011

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[1] Analog models investigate the evolution and architecture of the Baikal rift in relation to the rheology of the extending lithosphere and rift kinematics. The models focus on the development of the narrow, deep, and asymmetric basins composing Lake Baikal and reproduce the extension between the strong Siberian craton and the weaker Sayan-Baikal belt. Model results suggest that the presence of a near-vertical weak suture separating the cratonic keel from the mobile belt represents the more convenient rheological configuration leading to a narrow rift characterized by prominent vertical motions and deep depressions. These depressions are typically asymmetric, and model results suggest that this asymmetry is a consequence of lateral variations in lithospheric rheology, which is in turn related to both the variation in thickness of the strong mantle and, more importantly, the variation in the brittle-ductile transition depth between the craton and the belt. A significant shallowing of the brittle-ductile transition in the crust passing from the craton to the belt is required to fit the asymmetric architecture of the Baikal basins, with a master fault on the craton side and a monocline with no significant faulting on the belt side. Analysis of the model deformation pattern suggests that the overall architecture of the basins hosting Lake Baikal is best fitted for a N140°E directed extension, similar to the current GPS-derived motion and compatible with the stress field inferred on the basis of fault and focal mechanism data. This kinematics (along with the shape of the Siberian craton) exerted the major control on the plan view fault architecture and its along-axis variations.

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Palaeozoic orogeneses around the Siberian craton: Structure and evolution of the Patom belt and foredeep

Cited by 13 publications

References 45 publications

Structural constraints on the evolution of the Central Asian Orogenic Belt in SW Mongolia

Structural constraints on the evolution of the Central Asian Orogenic Belt in SW Mongolia

How old is the Baikal Rift Zone? Insight from apatite fission track thermochronology

Controls of lithospheric structure and plate kinematics on rift architecture and evolution: An experimental modeling of the Baikal rift

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