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首页> 外文期刊>Journal of Asian earth sciences >Middle Miocene denudation of the Higher Himalayan Crystallines revealed by chemical composition of detrital garnets from the Siwalik foreland basin sediments, western and central Nepal
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Middle Miocene denudation of the Higher Himalayan Crystallines revealed by chemical composition of detrital garnets from the Siwalik foreland basin sediments, western and central Nepal

机译：由Siwalik前地盆地沉积物，西部和中部的Siwalik前泥浆化学成分揭示的中间内部Miocene剥落揭示了甲状腺泥沙

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摘要

The Middle Miocene to Early Pleistocene Siwalik Group is composed of sediments deposited in the Himalayan foreland basin. In this study, the heavy mineral assemblage and chemical composition of detrital garnets from the sandstones in the Lower Siwalik sub-group, which are exposed along the Karnali River in western Nepal and the Tinau Khola in central Nepal, are studied and the provenance shift during the Middle Miocene is discussed. The heavy mineral assemblage in the lower section of the Lower Siwalik sub-group is characterized as predominantly zircon-tourmaline-rutile. Chemical analysis of the detrital garnets showed a monomodal almandinerich composition with low pyrope (Prp ( 10)) and moderate grossular (Grs(10-20)) content. The composition pattern subsequently changed to a bimodal distribution with an increase in pyrope (Prp(10-25)) and low grossular (Grs ( 10)) content with the appearance of detrital staurolite. These results indicate that the Middle Miocene erosion of the Higher Himalayan Crystallines (HHC) are the source of the deposits in the Siwalik Group. Changes in the heavy mineral assemblage and garnet composition are recognized in the Karnali River section at 14-12 Ma and in the Tinau Khola section at 11-10 Ma, which suggests that the denudation of the HHC progressed from west to east in the western and central Nepal Himalayas.
机译：中小西肾上腺素早期唾液酸赛思克集团由沉积物沉积在喜马拉雅前陆盆地组成。在这项研究中，研究了来自尼泊尔西尼泊尔西部和尼泊尔西部的Karnali河的砂岩中的碎片装配和化学成分，并在中部尼泊尔（Nepal），并在出现期间讨论了中间内联。下思瓦次组下部的重型矿物组合的特征在于锆石 - 陀螺金红石。滴乳的化学分析显示含有低吡孔的单曲面半月形组合物（PRP（<10））和中等晶粒（GRS（10-20））含量。随后将组合物图案改变为双峰分布，随着毒物（PRP（10-25））和低晶粒（GRS（<10））含量的增加，具有滴乳半球石的出现。这些结果表明，HIMALAYAN结晶（HHC）的中间内烯糜烂是赤瓦氏菌群中沉积物的来源。重型矿物组合和石榴石组合物的变化在Karnali River段中在11-12 mA和Tinau Khola段中公认，这表明HHC的剥蚀从西部的西部进入西部和西部中央尼泊尔喜马拉雅山。

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