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Pamir Plateau formation and crustal thickening before the India-Asia collision inferred from dating and petrology of the 110-92 Ma Southern Pamir volcanic sequence

Authors :
Jamshed Aminov
Yunus Mamadjonov
Liyun Zhang
Guillaume Dupont-Nivet
Sherzod Abdulov
Shokirjon Yoqubov
Lin Ding
Javhar Aminov
Jovid Aminov
Key Laboratory of Continental Collision and Plateau Uplift
Chinese Academy of Sciences [Changchun Branch] (CAS)-Institute of Tibetan Plateau Research
Institute of Geology, Earthquake Engineering and Seismology
Academy of Sciences of the Republic of Tajikistan
CAS Center for Excellence in Tibetan Plateau Earth Sciences
Institute of Earth and Environmental Sciences
Universität Potsdam
Géosciences Rennes (GR)
Université de Rennes 1 (UR1)
Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire des Sciences de l'Univers de Rennes (OSUR)-Centre National de la Recherche Scientifique (CNRS)
Xinjiang Institute of Ecology and geography
Chinese Academy of Sciences [Beijing] (CAS)
41490610, National Natural Science Foundation of China
XDB03010401, Chinese Academy of Sciences
649081, H2020 European Research Council
13-BS06-12-01, Agence Nationale de la Recherche
University of Potsdam = Universität Potsdam
Université de Rennes (UR)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire des Sciences de l'Univers de Rennes (OSUR)
Université de Rennes (UR)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 2 (UR2)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 2 (UR2)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Centre National de la Recherche Scientifique (CNRS)
Source :
Gondwana Research, Gondwana Research, Elsevier, 2017, 51, pp.310-326. ⟨10.1016/j.gr.2017.08.003⟩, Gondwana Research, 2017, 51, pp.310-326. ⟨10.1016/j.gr.2017.08.003⟩
Publication Year :
2017
Publisher :
HAL CCSD, 2017.

Abstract

The formation of the Pamir is a key component of the India-Asia collision with major implications for lithospheric processes, plateau formation, land-sea configurations and associated climate changes. Although the formation of the Pamir is traditionally linked to Cenozoic processes associated with the India-Asia collision, the contribution of the Mesozoic tectonic evolution remains poorly understood. The Pamir was formed by the suturing of Gondwanan terranes to the south margin of Eurasia, however, the timing and tectonic mechanisms associated with this Mesozoic accretion remain poorly constrained. These processes are recorded by several igneous belts within these terranes, which are not well studied. Within the Southern Pamir, the Albian-Turonian volcanic rocks and comagmatic plutons of the Kyzylrabat Igneous Complex (KIC) provide an important and still unconstrained record of the Pamir evolution. Here we provide the age, origin and the geodynamic setting of the KIC volcanics by studying their petrology, zircon U-Pb geochronology, geochemistry and isotope composition.17 samples from the KIC volcanics yield U-Pb ages spanning from 92 to 110 Ma. The volcanics are intermediate to acidic in composition (SiO2 = 56-69 wt%) and exhibit high-K calc-alkaline and shoshonitic affinity (K2O/Na2O = 12.2 wt%). They show enrichment in LILE and LREE and depletion in HFSE and HREE with negative Ta, Ti and Nb anomalies, suggesting an arc-related tectonic setting for their formation. Low sNd(t) values (from 9.1 to 4.7), relatively high Sr-87/Sr-86(i) ratios (0.7069-0.7096) and broad range of zircon stif values (from 22.6 to 1.5) suggest a mixture of different magma sources. These features suggest that volcanics were derived by crustal under- or intraplating of an enriched subduction-related mantle shoshonitic magmas, by heating and partial melting of the lower crust, and by mixing of both magma components. Our results further imply that the KIC volcanics represent a shoshonitic suite typical of an evolution from active continental arc to post-collisional setting with a steepening of the Benioff zone and thickening of the crust toward the back-arc. This setting is best explained by the subduction- collision transition along the Shyok suture due to accretion of the Kohistan island arc to the Karakoram. This suggests that a significant part of the crustal shortening and thickening accommodated in the Pamir occurred in the Mesozoic before the India-Asia collision with implications for regional tectonic models. This further suggests the Pamir was already a major topographic feature with potentially important paleoclimate forcing such as the monsoonal circulation. (C) 2017 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved.

Details

Language :
English
ISSN :
1342937X and 18780571
Database :
OpenAIRE
Journal :
Gondwana Research, Gondwana Research, Elsevier, 2017, 51, pp.310-326. ⟨10.1016/j.gr.2017.08.003⟩, Gondwana Research, 2017, 51, pp.310-326. ⟨10.1016/j.gr.2017.08.003⟩
Accession number :
edsair.doi.dedup.....2b328a4b653ee6cb39af68bdb34637d0
Full Text :
https://doi.org/10.1016/j.gr.2017.08.003⟩