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首页> 外文期刊>Current Science: A Fortnightly Journal of Research >Origin of oceanic plagiogranite in the Nidar ophiolitic sequence of eastern Ladakh, India
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Origin of oceanic plagiogranite in the Nidar ophiolitic sequence of eastern Ladakh, India

机译：印度东部拉达克Nidar滑石序列中的海洋斜长花岗岩的起源

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摘要

Occurrence of high-SiO2, low K2O leucocratic rocks, the 'oceanic plagiogranite' of Coleman and Peterman, within the basic and ultrabasic rocks of the ophiolites and modern oceanic settings, is of particular interest because of their extreme composition and controversial origin. Ophiolitic sequences are considered incomplete without these rocks. However, these rocks are not present in all the known ophiolite sequences in the world. The present study reports the occurrence of plagiogranite to the north of Kyun Tso, within the Nidar ophiolitic sequence of eastern Ladakh. Plagio-granites occur as intrusives within the gabbro, in the northern part of the ophiolitic sequence. Chemically, they are classified into tonalite and trondhjemite. They show nearly flat REE pattern and fractionation relation that are comparable with the host gabbro. The origin of these rocks is explained by fractional crystallization aided by filter-pressing processes of sub-alkaline tholeiitic magmas.
机译：在蛇绿岩和现代海洋环境的基础和超基性岩石中，高SiO2，低K2O白垩纪岩石，科尔曼和彼得曼的“海洋斜长花岗岩”的出现由于其极端的组成和有争议的成因而特别引起人们的兴趣。如果没有这些岩石，则蛇绿岩序列被认为是不完整的。但是，这些岩石并不存在于世界上所有已知的蛇绿岩序列中。本研究报告了在拉达克东部的尼达尔（Nidar）滑石序列内，在Kyun Tso北部出现斜长花岗岩。斜长花岗岩以侵入岩的形式出现在辉石岩北部的辉长岩内。从化学上讲，它们分为方钠石和硬锂锰矿。它们显示出几乎平坦的REE模式和分馏关系，可与宿主辉长岩相媲美。这些岩石的起源是通过分次结晶和亚碱性高渗岩浆的压滤作用来解释的。

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