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
中科院分区:
文献类型:
--
作者:
O'Brien;Altenberger;Konrad-Schmolke;Ahmed Khan
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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影响因子:
3.5
作者:
J. Pearce;M. Norry
通讯作者:
J. Pearce;M. Norry
DOI:
10.1144/gsl.sp.2000.170.01.22
发表时间:
2000
期刊:
Geological Society, London, Special Publications
影响因子:
--
作者:
B. Lombardo;F. Rolfo;R. Compagnoni
通讯作者:
R. Compagnoni
DOI:
--
发表时间:
1989
期刊:
Eclogae Geologicae Helvetiae
影响因子:
--
作者:
K. Papritz;R. Rey
通讯作者:
R. Rey
DOI:
--
发表时间:
2000
期刊:
Geological Society Special Publication
影响因子:
--
作者:
D. Fontan;M. Schouppe;C. Hunziker;G. Martinotti;J. Verkaeren
通讯作者:
J. Verkaeren
DOI:
10.1144/gsl.sp.1993.074.01.16
发表时间:
1993
期刊:
Geological Society, London, Special Publications
影响因子:
--
作者:
A. Greco;D. Spencer
通讯作者:
D. Spencer