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学科主题: 地球科学::地质学
题名: 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
作者: Aminov, J (Aminov, Jovid)1, 2, 3; Ding, L (Ding, Lin)1; Mamadjonov, Y (Mamadjonov, Yunus)3; Dupont-Nivet, G (Dupont-Nivet, Guillaume)4, 5; Aminov, J (Aminov, Jamshed)1, 3; Zhang, LY (Zhang, Li-Yun)1; Yoqubov, S (Yoqubov, Shokirjon)3; Aminov, J (Aminov, Javhar)6; Abdulov, S (Abdulov, Sherzod)1, 3
通讯作者: Aminov, J
关键词: HIMALAYAN-TIBETAN OROGEN ; MIGMATITIC GNEISS DOME ; HINDU KUSH REGION ; CHEMICAL CLASSIFICATION ; CONTINENTAL SUBDUCTION ; ISOTOPIC CONSTRAINTS ; NORTHWESTERN CHINA ; CALC-ALKALINE ; NW PAKISTAN ; SUTURE ZONE
刊名: GONDWANA RESEARCH
发表日期: 2017
DOI: 10.1016/j.gr.2017.08.003
卷: 51, 期:0, 页:310-326
收录类别: SCI
合作性质: 国际
文章类型: Article
类目[WOS]: Geosciences, Multidisciplinary
研究领域[WOS]: Geology
英文摘要: 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.
语种: 英语
WOS记录号: WOS:000416499300019
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.itpcas.ac.cn/handle/131C11/7951
Appears in Collections:图书馆_期刊论文

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作者单位: 1.Chinese Acad Sci, Key Lab Continental Collis & Plateau Uplift, Inst Tibetan Plateau Res, Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China.
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China.
3.Acad Sci Republ Tajikistan, Inst Geol Earthquake Engn & Seismol, 267 Ayni St, Dushanbe 734053, Tajikistan.
4.Potsdam Univ, Inst Earth & Environm Sci, Karl Liebknecht Str 24-25, D-14476 Potsdam, Germany.
5.Univ Rennes1, OSUR Geosci Rennes, CNRS, UMR 6118, Campus Beaulieu, F-35042 Rennes, France.
6.Chinese Acad Sci, Xinjiang Inst Ecol & Geog, Urumqi, Xinjiang, Peoples R China.

Recommended Citation:
Aminov, J ,Ding, L ,Mamadjonov, Y ,et al. 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[J]. GONDWANA RESEARCH,2017,51(0):310-326.
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