伊朗西部萨南达伊·西尔詹地区Boroujerd地区含电气石的成因及其意义

IF 1 Q4 GEOSCIENCES, MULTIDISCIPLINARY
Vahid Ahadnejad
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引用次数: 0

摘要

电气石矿物是一种主要的岩石成因工具,因为它们的难成岩性、化学变异性和广泛分布在各种地质环境中。中侏罗统Boroujerd火成岩是位于sanandaji - sirjan岩浆弧(SSMA)中部最大的岩体之一,该岩浆弧引入了区域变质岩。它们主要由花岗闪长岩、石英闪长岩和二长花岗岩组成,并含有磷灰石、锆石和电气石等丰富的副矿物。电气石以不同类型的矿物组合、化学成分和个体形式出现,包括电气石、石英-电气石脉,作为更进化的花岗岩类和片岩中的辅助矿物。这些岩石中的碧玺晶体大小从极细到粗粒不等。颜色为棕色到黑色,一些晶体显示出精细的化学分带。碧玺晶体通常表现出细胞特征。电子探针显微分析(EPMA)表明,榴辉石是花岗岩类中最丰富的电气石类型,辉石和驱动石分别是伟晶岩和片岩中的常见成分。几代碧玺的存在及其组成趋势可能指示了随时间变化的相对酸性含硼流体,并反映了其结晶过程中缺氧熔体的影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Origin and significance of tourmaline-bearing rocks in Boroujerd region, Sanandaj-Sirjan zone, western Iran
Tourmaline minerals are a main petrogenetic tool because of their refractory nature, chemical variability, and extensive occurrence in various geological settings. The Middle-Jurassic Boroujerd igneous rocks are one of the largest bodies that located in the middle part in the Sanandaj-Sirjan Magmatic Arc (SSMA) that introduced into regional metamorphic rocks. They are mostly composed of granitoids (granodiorite, quartz-diorite, and monzogranite) and contain apatite, zircon and tourmaline as abounadant accessory minerals. Tourmalines occur in varying types of mineral assemblages, chemical compositions and individual forms including tourmalinite, quartz-tourmaline vein, as accessory mineral in the more evolved granitoids, and schists. Tourmaline crystal sizes in these rocks varies from very fine to coarse-grained. The colour is brown to black and some crystals displaying a finescale chemical zonation. Tourmaline crystals commonly exhibit cellular features. Based on electron probe microanalysis (EPMA) analyses, schorl is the most abundant type of tourmaline in granitoids but foitite and dravite are common compositions in the pegmatite and schist, respectively. Presence of several tourmaline generations and their compositional trend may indicate time-varying relatively acidic boron-bearing fluids and reflects an anatexic melts influence in their crystallization.
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来源期刊
Iranian Journal of Earth Sciences
Iranian Journal of Earth Sciences GEOSCIENCES, MULTIDISCIPLINARY-
CiteScore
1.40
自引率
12.50%
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0
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