印度中部Malanjkhand岩体侵入型阿普立特岩脉的岩石成因及成矿作用

IF 1 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS
Dinesh Pandit
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引用次数: 0

摘要

本文研究了马兰杰坎德岩体中围合的阿普立特岩脉的结构变化与构造走向之间的关系。锆石饱和温度(747 ~ 835℃)和结晶压力(2.5 ~ 6.1 kbar)表明,该长石岩脉位于陆壳中下位。水溶解度计算表明,该岩脉起源于水欠饱和条件下的硅质岩浆。原始地幔归一化蜘蛛图显示大离子亲石元素(LILEs)富集,高场强元素(hfse)耗散。阿普里特岩脉呈现低稀土富集和低稀土亏缺模式,稀土模式呈显著的正eu异常。这一发现暗示了在还原环境中,长英质岩浆结晶之前,斜长石晶体的积累。eu -正异常的存在表明,在地壳中下位已存在的花岗质烃源岩由于在长英质烃源岩上方部分熔融而产生了黏液岩浆。微量元素判别图显示了大陆裂谷环境下可能的伸展构造背景,并结合了长英质岩浆活动和花岗质深部活动,因此有利于阿普立特岩脉的侵位。岩脉Th/U比值表明岩浆房中熔体分馏作用和岩浆期后热液作用对岩浆结晶演化的影响可以忽略不计。阿普立特岩脉指向单一的硅质岩浆活动脉冲和连续的注入过程,从而反映了寄主Malanjkhand岩体形成物理条件的微妙变化。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Petrogenesis and Metallogeny of Intrusive Aplite Dyke from the Malanjkhand Pluton, Central India

Petrogenesis and Metallogeny of Intrusive Aplite Dyke from the Malanjkhand Pluton, Central India

The relationships between textural variations and structural trends of the aplite dyke enclosed in the Malanjkhand pluton were investigated in this study. The estimated zircon saturation temperature (747–835°C) and pressure of crystallization (2.5–6.1 kbar) suggested that the aplite dyke was emplaced in the lower-middle level in the continental crust. Water solubility calculations indicated that the aplite dyke originated from the silicic magma under water undersaturated conditions. Primitive mantle normalized spider diagram showed enrichment of large-ion lithophile elements (LILEs) and depletion of high field strength elements (HFSEs). The aplite dyke displayed LREE-enriched and MREE-depleted patterns, with significant positive Eu-anomaly in the REE patterns. This observation alluded the accumulation of plagioclase crystals before the crystallization of felsic magma in the reduced environment. The presence of the positive Eu-anomaly signified that the pre-existing granitic source at the lower-middle level of the crust generated aplitic magma owing to partial melting above the felsic source rock. Trace element discrimination diagrams presented evidence for possible extensional tectonic settings coupled with felsic magmatic episodes and granitic plutonic activity in a continental rift environment, thus favoring the emplacement of the aplite dyke. Th/U ratios in the aplite dyke implied that the melt fractionation in the magma chamber and the post-magmatic hydrothermal processes exerted negligible effect on the crystallization evolution of the aplitic magma. The aplite dyke pointed to a single pulse of silicic magmatism and a continuous process of injection, thus reflecting subtle variations in the physical conditions of the formation of the host Malanjkhand pluton.

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来源期刊
Petrology
Petrology 地学-地球科学综合
CiteScore
2.40
自引率
20.00%
发文量
27
审稿时长
>12 weeks
期刊介绍: Petrology is a journal of magmatic, metamorphic, and experimental petrology, mineralogy, and geochemistry. The journal offers comprehensive information on all multidisciplinary aspects of theoretical, experimental, and applied petrology. By giving special consideration to studies on the petrography of different regions of the former Soviet Union, Petrology provides readers with a unique opportunity to refine their understanding of the geology of the vast territory of the Eurasian continent. The journal welcomes manuscripts from all countries in the English or Russian language.
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