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首页> 外文期刊>Journal of Asian earth sciences >Retrograde corona texture in pre-Himalayan metamorphic mafic xenoliths, Sutlej valley, NW Himalaya: Implication on rare occurrence of high-grade rocks in the Himalaya
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Retrograde corona texture in pre-Himalayan metamorphic mafic xenoliths, Sutlej valley, NW Himalaya: Implication on rare occurrence of high-grade rocks in the Himalaya

机译：喜马拉雅山西北部苏特莱奇山谷的喜马拉雅前变质镁铁质异质岩中的逆行电晕纹理：对喜马拉雅山中高档岩石罕见发生的影响

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摘要

The present study documents extensive retrogression in mafic xenoliths embedded in the Kinnaur Kailash Granite (～500 Ma), Sutlej valley, NW Himalaya. Most of the mafic xenoliths are hornblende-rich and are characterized by numerous retrograde corona textures such as garnet coronae around clinopy-roxene and plagioclase, titanite coronae around ilmenite, and hornblende coronae around clinopyroxene. This implies that the mafic xenoliths had undergone granulite-facies metamorphism in the early stage of metamorphic evolution, and have been extensively retrograded at a later stage to the present day amphibole-rich mafic xenoliths. The retrogression path traced by these mafic xenoliths can be constrained through P-T estimates using hbl-grt and hbl-pl geothermometry, hbl-grt-pl geobarometry, and Thermo-calc3.21 calculations. The estimated results suggest temperatures in the range of 536-662 ℃ and pressures in the range of 4.5-6.7 kbar for the formation of the corona textures. P-T calculation of garnet forming reaction rim around clinopyroxene further shows that retrogression had started at ～650 ℃ and ～7.3 kbar. These observations suggest that retrogression played a major role in the obliteration of most of the high-grade pre-Himalayan xenoliths from the Himalaya.
机译：本研究表明，喜马拉雅山苏特利河谷的Kinnaur Kailash花岗岩（〜500 Ma）中埋藏的镁铁质异岩广泛倒退。多数铁镁质异质岩富含角闪石，其特征是具有许多逆行的电晕结构，例如斜发石-环氧丙烷和斜长石周围的石榴石日冕，钛铁矿周围的钛铁矿日冕和斜发石周围的角闪石日冕。这暗示着铁镁质异种岩在变质演化的早期就经历了花岗石相变质作用，并在后来的阶段广泛地逆行至今天的富含闪石的镁铁质异种岩。可以使用hbl-grt和hbl-pl地热法，hbl-grt-pl地热法和Thermo-calc3.21计算通过P-T估计来约束这些镁铁质异质岩追踪的回归路径。估计的结果表明温度在536-662℃的范围内，压力在4.5-6.7 kbar的范围内，可形成电晕纹理。石榴石形成反应环周围的石榴石形成反应边缘的P-T计算进一步表明，在约650℃和约7.3 kbar时开始出现倒退。这些观察结果表明，回归作用在消除喜马拉雅山大部分喜玛拉雅山之前的高级异种石中起了主要作用。

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