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首页> 外文期刊>Journal of Asian earth sciences >Primary to re-equilibrated fluids and geochemical signatures for the evolution of the Nagthat siliciclastics in the Tons valley, Lesser Himalaya, India
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Primary to re-equilibrated fluids and geochemical signatures for the evolution of the Nagthat siliciclastics in the Tons valley, Lesser Himalaya, India

机译：印度小喜马拉雅山通斯谷Nagthat硅质碎屑岩演化的主要至重新平衡的流体和地球化学特征

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摘要

Medium to coarse-grained Neo-Proterozoic Nagthat siliciclastic rocks form a part of the Krol Formation in the Lesser Himalayan geo-tectonic zone. Fluid inclusion and geochemical studies have been carried out on the Nagthat siliciclastics from the Tons valley to determine their provenance during the Proterozoic and their recrystallisation during maximum burial to uplift. Fluid inclusion studies have been carried out on detrital, recrystallised quartz grains and quartz overgrowths. Major and trace element analyses of the siliciclastics, the relationships of SiO_2 with various trace elements, and the association of various trace elements with mineral species suggest a granitic source for these siliciclastics. Primary Q1 aqueous brine inclusions and Q3 H_2O-CO_2 fluid with 0.9 gm/cm~3 CO_2 density in detrital quartz grains characterised the protolith of the sandstone as granite or metamorphic rocks. H_2O-NaCl fluids participated in the cementation history, temperatures of quartz overgrowth from 198 to 232℃ show the effect of maximum burial. The re-equilibration of the primary fluid due to elevated internal pressure > confining pressure is evident from features like 'C' shaped cavities, stretching of the inclusions, their migration, decrepitation clusters, etc. During recrystallisation these inclusions were equilibrated at 187° and 235℃ in a restricted fluid of aqueous, moderately saline composition. The observed inclusion morphology is attributed to a decrease in external pressure related to isothermal decompression uplift.
机译：中小粒度的新元古代的那格硅质碎屑岩形成了小喜马拉雅地质构造区Krol组的一部分。已经对来自Tons谷的Nagthat硅质碎屑岩进行了流体包裹体和地球化学研究，以确定它们在元古代的物源以及在最大埋藏到隆升期间的重结晶。已经对碎屑，重结晶的石英晶粒和石英过度生长进行了流体包裹体研究。硅质碎屑的主要元素和痕量元素分析，SiO_2与各种痕量元素的关系以及各种痕量元素与矿物种类的关联为这些硅质碎屑提供了花岗岩来源。碎屑石英颗粒中主要的Q1含水卤水包裹体和Q3 H_2O-CO_2流体（密度为0.9 gm / cm〜3 CO_2）的特征是砂岩的原生岩为花岗岩或变质岩。 H_2O-NaCl流体参与了胶结历史，石英过度生长的温度从198到232℃表现出最大的埋藏效果。由于“ C”形空腔，夹杂物的拉伸，其夹杂物的迁移，破裂团簇等特征，内部压力>围压升高引起的主流体重新平衡是显而易见的。在重结晶过程中，这些夹杂物在187°和235℃，在中等水含量的受限液体中流动。观察到的夹杂物形态归因于与等温减压隆起有关的外部压力的降低。

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