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首页> 外文期刊>Journal of Asian earth sciences >Dehydration melting studies in a 'Kyanite terrain', Manali, NW Himalayas
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Dehydration melting studies in a 'Kyanite terrain', Manali, NW Himalayas

机译：喜马拉雅山西北部马纳里的“蓝晶岩地形”中的脱水融化研究

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The Beas valley section in Himachal Pradesh is characterized by the presence of kyanite as the alumino-silicate phase and a small extent of Neogene quartzo-feldspathic intrusives. The present paper explores the reasons for the lack of extensive granite occurrences through a detailed petrologic study on samples of a drill core (200 m, inclined 60° due ESE) close to Manali, the expected highest point in P-T space in this section. The highest assemblage encountered is quartz + muscovite + biotite + garnet + plagioclase + kyanite ± apatite ± zircon ± tourmaline ± ilmenite ± rutile. The chemical analyses of mineral grains were carried out on a CAMECA SX51 EPMA. The following two reactions that constrain the P-T regime of the area have been established. St + Qtz → Alm + Ky + H_2O Bio + Plg + Qtz + Ksp → Gar + Ky + Liq. Our result, P = 8.25±1 kbar, T = 638±4℃, falls in a region between curves representing a_(H_2O)= 1.0 and a_(H_2O) = 0.7 of the fluid in Thompson [Trans. Royal Soc. Edinb. 87 (1996) 1] diagram. The P-T estimate falls in the kyanite field and is very close to the mica dehydration-melting curve. The studies indicate that the core samples are a part of progressive metamorphic sequence. It implies that the absence of sillimanite and large scale melting is perhaps chance brought about by thrusting and erosion. The present section experienced single stage dehydration melting.
机译：喜马al尔邦比斯河谷断层的特征是存在作为铝硅酸盐相的蓝晶石和少量新近纪石英长石侵入体。本文通过对靠近Manali（本节P-T空间的预期最高点）的钻芯（200 m，由于ESE倾斜60°）倾斜的岩心样本进行了详细的岩石学研究，探讨了缺乏大量花岗岩发生的原因。遇到的最高组合是石英+白云母+黑云母+石榴石+斜长石+蓝晶石±磷灰石±锆石±电气石±钛铁矿±金红石。矿物晶粒的化学分析是在CAMECA SX51 EPMA上进行的。建立了限制该地区P-T体制的以下两个反应。 St + Qtz→Alm + Ky + H_2O Bio + Plg + Qtz + Ksp→Gar + Ky + Liq。我们的结果，P = 8.25±1 kbar，T = 638±4℃，落在代表汤普森流体中a_（H_2O）= 1.0和a_（H_2O）= 0.7的曲线之间的区域中。皇家社会。爱丁堡87（1996）1]图。 P-T估算值落在蓝晶石场中，非常接近云母的脱水熔融曲线。研究表明，核心样本是渐进变质序列的一部分。这暗示着硅线石的缺乏和大规模熔化可能是由推力和侵蚀带来的机会。本节经历了单级脱水熔融。

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