阿基坦时期巴斯塔克拉通与东高地省缝合形成大印度陆块:地球化学、铀-铅地质年代和相平衡模型的启示

IF 3.2 2区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY
J. Padmaja , Tapabrato Sarkar , Somnath Dasgupta
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引用次数: 0

摘要

印度中部阿新世时期的巴斯塔克拉通(Bastar craton,BC)与新生代时期的东高止山脉省(Eastern Ghats Province,EGP)之间的接触面上有一条缝合带,被称为地层边界剪切带(Terrane Boundary Shear Zone,TBSZ)。该地区的BC岩主要由角闪石-黑云母花岗岩和一些黑云母岩体组成。地台边界剪切带的岩石包括石英长石(鳞片岩)片麻岩、含石榴子石-正长辉石的花岗岩、黑云母花岗岩(A 组为板岩亲缘岩,B 组为 EGP 亲缘岩)、镁铝花岗岩以及个别出露的含正长辉石的片麻岩。详细的地球化学分析表明,Hbl-Bt 花岗岩与具有 A 型亲缘关系的含 Grt-Opx 花岗岩之间,以及黑云母岩体与 A 组黑云母花岗岩之间具有显著的相似性。然而,含 Opx 的片麻岩在地球化学上是独特的,具有 I 型亲和性,与不列颠哥伦比亚省的 TTG 片麻岩相似。变质相平衡分析和痕量元素建模显示:(i) 含奥泊斯片麻岩熔化后会产生类似 Hbl-Bt 花岗岩的铁质花岗岩熔体;(ii) 在适当的 P-T 条件下发生变质作用后,花岗岩会转变为含 Grt-Opx 的花岗岩,而黑云母岩则会转变为 A 组黑云母花岗岩。锆石的U-Pb地质年代确定了含Opx片麻岩和含Grt-Opx花岗岩的岩浆前体的成岩年龄分别为约2.73 Ga和约2.5 Ga。这些岩石经历了早期的花岗岩变质作用,随后是闪长岩变质作用、剪切作用和含水流体通量作用。地质年代数据显示,后一事件发生于约 0.52 Ga,而早期事件发生于约 0.52 Ga。地质年代数据显示,后一事件发生在大约 0.52 Ga,而较早的花岗岩面事件只能初步推断为斯泰尼安/托尼安时代晚期。综合所有证据(包括已公布的地球物理和地质年代数据),我们认为公元前和东元古代之间的最初碰撞发生在斯氏晚期/顿纪,是大印度陆块(罗迪尼亚超大陆的一部分)形成的结果。TBSZ可能是由于晚期的斯泰尼安/顿河碰撞而引发的,在大约0.52Ga时被重新激活和构造热重塑。库恩嘎造山运动的远场应力效应足以抹去斯氏晚期/顿河造山运动的大部分印记。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Suturing of the Archean Bastar craton with the Eastern Ghats Province to form the Greater Indian Landmass: Insights from geochemistry, U-Pb geochronology and phase equilibria modelling

Suturing of the Archean Bastar craton with the Eastern Ghats Province to form the Greater Indian Landmass: Insights from geochemistry, U-Pb geochronology and phase equilibria modelling

The contact between the Archean Bastar craton (BC) and Proterozoic Eastern Ghats Province (EGP), central India, is marked by a suture zone termed Terrane Boundary Shear Zone (TBSZ). BC in this area is largely composed of hornblende-biotite granite with some mafic dykes. Rocks in the TBSZ include quartzofeldspathic (leptynite) gneiss, garnet-orthopyroxene-bearing granitoid, mafic granulites (Group A of cratonic affinity, and Group B of EGP affinity), Mg-Al granulite and an isolated exposure of orthopyroxene-bearing gneiss. Detailed geochemical analysis shows remarkable similarity between Hbl-Bt granite and Grt-Opx-bearing granitoid, with A-type affinity, and between mafic dykes and Group A mafic granulites. However, the Opx-bearing gneiss is geochemically distinct having I-type affinity, similar to TTG gneisses described from BC. Metamorphic phase equilibria analysis and trace element modelling shows that (i) melting of Opx-bearing gneiss would produce a ferroan granitic melt resembling the Hbl-Bt granite, (ii) metamorphism at appropriate P-T conditions would convert the granite to Grt-Opx-bearing granitoid and the mafic dyke to Group A mafic granulite. U-Pb geochronology of zircon constrains emplacement ages of the magmatic precursors of Opx-bearing gneiss and Grt-Opx-bearing granitoid as ca. 2.73 and ca. 2.5 Ga, respectively. These rocks were subjected to an early granulite facies metamorphism, followed by an amphibolite facies metamorphism, shearing and hydrous fluid flux. Geochronological data shows that the latter event took place at ca. 0.52 Ga, while the earlier granulite facies event can only be tentatively suggested to be of late Stenian/Tonian age. Collating all the evidence (including published geophysical and geochronological data), we suggest that the initial collision between BC and EGP took place during late Stenian/Tonian time as a consequence of formation of the Greater Indian Landmass, a part of Rodinia supercontinent. The TBSZ, probably initiated due to the late Stenian/Tonian collision, was reactivated and reworked tectonothermally at ca. 0.52 Ga, caused by far field stress effect of the Kuunga orogeny, which was strong enough to obliterate most of the imprints of the late Stenian/Tonian orogeny.

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来源期刊
Precambrian Research
Precambrian Research 地学-地球科学综合
CiteScore
7.20
自引率
28.90%
发文量
325
审稿时长
12 months
期刊介绍: Precambrian Research publishes studies on all aspects of the early stages of the composition, structure and evolution of the Earth and its planetary neighbours. With a focus on process-oriented and comparative studies, it covers, but is not restricted to, subjects such as: (1) Chemical, biological, biochemical and cosmochemical evolution; the origin of life; the evolution of the oceans and atmosphere; the early fossil record; palaeobiology; (2) Geochronology and isotope and elemental geochemistry; (3) Precambrian mineral deposits; (4) Geophysical aspects of the early Earth and Precambrian terrains; (5) Nature, formation and evolution of the Precambrian lithosphere and mantle including magmatic, depositional, metamorphic and tectonic processes. In addition, the editors particularly welcome integrated process-oriented studies that involve a combination of the above fields and comparative studies that demonstrate the effect of Precambrian evolution on Phanerozoic earth system processes. Regional and localised studies of Precambrian phenomena are considered appropriate only when the detail and quality allow illustration of a wider process, or when significant gaps in basic knowledge of a particular area can be filled.
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