早古生代双峰岩浆作用记录了喜马拉雅中部由碰撞构造向伸展构造的转变

IF 3.5 3区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY
Zhiqiang YIN, Longqiang LIU, Xiaochun LÜ, Nan LI, Lidong ZHU, Qiang LIU, Erjia HA
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引用次数: 0

摘要

喜马拉雅早古生代的构造环境一直是科学界争论不休的话题。通过野外综合地质调查,对中部山脉新发现的双峰侵入岩进行了岩石学、锆石U-Pb年代学、锆石Hf同位素和全岩地球化学分析。Palie双峰侵入岩形成于~ 489 Ma,由角闪岩和花岗质片麻岩组成。角闪岩地球化学特征与N-MORB相一致,花岗质片麻岩属于高钾钙碱性过铝s型花岗岩。两种火成岩的锆石εHf(t)值均为负,表现为古TDMC时代。结合区域地质调查结果,可以推断出Palie双峰侵入岩的形成是在碰撞后伸展构造背景下形成的。角闪岩的成因是岩石圈地幔的部分熔融和地壳的同化作用,而花岗质片麻岩的成因则是先前长英质地壳的部分熔融作用。研究结果表明,喜马拉雅早古生代经历了从泛非碰撞环境到碰撞后伸展构造的转变。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Early Paleozoic Bimodal Magmatism Documents the Transition from Collisional to Extensional Tectonics within the Central Himalaya

Early Paleozoic Bimodal Magmatism Documents the Transition from Collisional to Extensional Tectonics within the Central Himalaya

The tectonic setting of the Himalaya during the Early Paleozoic has been a subject of enduring debate within the scientific community. Newly discovered bimodal intrusive rocks from comprehensive field geological investigation in the central mountain range were subjected to petrology, zircon U-Pb geochronology, zircon Hf isotopes and whole-rock geochemistry analyses. The Palie bimodal intrusive rocks, comprising amphibolite and granitic gneiss, were formed at ∼489 Ma. The amphibolite exhibits geochemical characteristics consistent with N-MORB, while the granitic gneiss is classified as high potassium calc-alkaline peraluminous S-type granite. Both igneous rocks exhibit negative zircon εHf(t) values and display ancient TDMC ages. In conjunction with regional geological survey findings, it can be inferred that the formation of the Palie bimodal intrusive rocks occurred within a post-collision extensional tectonic setting. The amphibolite genesis involved partial melting of an enriched lithospheric mantle with some crustal assimilation, whereas the origin of the granitic gneiss can be attributed to partial melting of pre-existing felsic crust. Our data indicate that during the Early Paleozoic, the Himalaya underwent a transition from a pan-African collisional setting to post-collisional extensional tectonics.

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来源期刊
Acta Geologica Sinica ‐ English Edition
Acta Geologica Sinica ‐ English Edition 地学-地球科学综合
CiteScore
3.00
自引率
12.10%
发文量
3039
审稿时长
6 months
期刊介绍: Acta Geologica Sinica mainly reports the latest and most important achievements in the theoretical and basic research in geological sciences, together with new technologies, in China. Papers published involve various aspects of research concerning geosciences and related disciplines, such as stratigraphy, palaeontology, origin and history of the Earth, structural geology, tectonics, mineralogy, petrology, geochemistry, geophysics, geology of mineral deposits, hydrogeology, engineering geology, environmental geology, regional geology and new theories and technologies of geological exploration.
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