巴基斯坦俾路支省ZHOB蛇绿岩NAWEOBA地块地壳深成岩岩石学

Naseer Uddin, M. Kakar, Umar Farooq, M. Panezai, Mukhtiar Ghani, N. Ahmed
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引用次数: 1

摘要

Zhob蛇绿岩杂岩由三个独立的块体组成,分别命名为Omzha、Ali Khanzai和Naweoba块体。绘制了Naweoba地块的地壳深成剖面图,并将其划分为辉长岩和花岗岩。根据岩石学研究,辉长岩落在辉长岩、辉长岩和角闪辉长岩的范围内,而花岗岩落在富含石英的花岗岩、花岗闪长岩、斜长花岗岩和英云闪长岩附近。辉长岩覆盖了地壳深成部分的最大面积,通常是中等粒度的,而在许多地方,肉眼可见的粒度相当大。矿物辉长岩由斜方辉石、单斜辉石、角闪石和斜长石组成。这些岩石可能是兹霍布蛇绿岩主要地壳深成段的碎片。具有镁铁质矿物的花岗岩在东部突出,而长英质矿物突出的花岗岩在西部。与西部相比,花岗岩体的东侧是致密和块状的,而西部则是完全蚀变和破碎的。花岗质岩石由斜长石、碱性长石和石英组成,其中金红石和铬尖晶石以微量存在。Naweoba地块的辉长岩可能是在岩浆室内形成的,这是部分结晶的结果。而花岗岩可能是同一岩浆室的晚期岩浆。Naweoba地块辉长岩和花岗岩与Muslim Bagh、Khanozai和Bela蛇绿岩的密切相关性表明,它们是在超俯冲带环境中形成的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
PETROLOGY OF THE CRUSTAL PLUTONIC ROCKS OF NAWEOBA BLOCK, ZHOB OPHIOLITE, BALOCHISTAN, PAKISTAN
Zhob Ophiolite complex is composed of three detached blocks named Omzha, Ali Khanzai and Naweoba blocks. The crustal plutonic section of the Naweoba block is mapped and divided into gabbro and granite. Based on petrographical studies, the gabbros fell in the domain of gabbro, gabbronorite, and hornblende gabbro while granitic rocks fell in the vicinity of quartz-rich granitic rocks, granodiorite, plagiogranite and tonalite. Gabbroic rocks cover the maximum area of the crustal plutonic section and are usually medium-grained while at many places the grain size is quite large to be seen with naked eyes. Minerlogically gabbroic rocks consist of orthopyroxene, clinopyroxene, amphibole and plagioclase. These rocks maybe the fragments of main crustal plutonic section of the Zhob ophiolite. The granitic rocks having mafic minerals dominted in the eastern portion, while the felsic minerals dominted ones are in the west. The eastern side of the granitic body is compact and massive compared to western portion which is quite altered and shattered. Granitic rocks are composed of plagioclase, alkali feldspar and quartz where rutile and Cr-spinel exist in trace amounts. The gabbros of Naweoba block may have formed in a magma chamber as a result of fractional crystallization. While the granites maybe a late magmatic differentiate from the same magma chamber. The close correlation of gabbroic and granitic rocks of Naweoba block with Muslim Bagh, Khanozai and Bela ophiolites suggests their formation in supra subduction zone setting.
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