Multi-stage reaction history in different eclogite types from the Pakistan Himalaya and implications for exhumation processes

Multi-stage reaction history in different eclogite types from the Pakistan Himalaya and implications for exhumation processes
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巴基斯坦喜马拉雅山不同榴辉岩类型的多阶段反应历史及其对折返过程的影响

DOI:
10.1016/j.lithos.2009.07.015
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发表时间:
2010
期刊:
影响因子:
3.5
通讯作者:
Ahmed Khan
Ahmed Khan
中科院分区:
地球科学2区
文献类型:
--
作者:
O'Brien;Altenberger;Konrad-Schmolke;Ahmed Khan

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变基性岩的样品来自印度板块俯冲边缘的岩石系列,即所谓的高喜马拉雅结晶岩,位于巴基斯坦的上卡汉河谷。从南部Saif-ul-Muluk周围出露的冕状粗玄岩,到北部靠近Kohistan弧岩石缝合带的柯石英榴辉岩。岩石常量和微量元素化学基本上揭示了单一的原岩作为五种不同榴辉岩类型的来源,它们在组构、模态矿物学以及矿物化学上都不同。新收集的样品的研究表明柯石英(证实了原位拉曼光谱)在石榴石和绿辉石。所有榴辉岩在折返过程中都有角闪石的生长。在某些柯石英榴辉岩的蓝闪石核心的存在,以barroxite指出,而在大多数样品中,变斑钠钙角闪石的镶边更多的铝钙角闪石(钠闪石,tschermakite,和edenite)。榴辉岩相金红石被钛铁矿所取代,钛铁矿本身通常被钛铁矿包围。此外,一些榴辉岩体还显示出含多硅白云母、石英、绿柱石和蓝晶石的浅色分凝。重要的含义是,复杂的折返路径显示阶段的初始冷却减压(形成蓝闪石),然后再加热:一个非常类似的情况下,报告的柯石英的榴辉岩系列的Tso Morari的,印度,东南450公里。
Metabasites were sampled from rock series of the subducted margin of the Indian Plate, the so-called Higher Himalayan Crystalline, in the Upper Kaghan Valley, Pakistan. These vary from corona dolerites, cropping out around Saif-ul-Muluk in the south, to coesite–eclogite close to the suture zone against rocks of the Kohistan arc in the north. Bulk rock major- and trace- element chemistry reveals essentially a single protolith as the source for five different eclogite types, which differ in fabric, modal mineralogy as well as in mineral chemistry. The study of newly-collected samples reveals coesite (confirmed by in situ Raman spectroscopy) in both garnet and omphacite. All eclogites show growth of amphiboles during exhumation. Within some coesite-bearing eclogites the presence of glaucophane cores to barroisite is noted whereas in most samples porphyroblastic sodic–calcic amphiboles are rimmed by more aluminous calcic amphibole (pargasite, tschermakite, and edenite). Eclogite facies rutile is replaced by ilmenite which itself is commonly surrounded by titanite. In addition, some eclogite bodies show leucocratic segregations containing phengite, quartz, zoisite and/or kyanite. The important implication is that the complex exhumation path shows stages of initial cooling during decompression (formation of glaucophane) followed by reheating: a very similar situation to that reported for the coesite-bearing eclogite series of the Tso Morari massif, India, 450 km to the south-east.
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