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青海省兴海县赛什塘铜矿中酸性侵入岩岩石地球化学特征及其成因研究
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摘要
本文通过对赛什塘铜矿区中酸性侵入岩体进行详细的地质学、岩石化学、造岩矿物学、同位素年代学、微量元素和同位素地球化学研究,探讨了赛什塘铜矿区该类岩石的成因信息;初步查明赛什塘铜矿区大规模钙碱性岩浆侵入事件发生的时代;定量反演了岩石的部分熔融程度、源区REE含量及岩浆结晶分异过程;初步建立了本区中酸性侵入岩的成因模式。揭示了赛什塘铜矿区中酸性侵入岩体以中-中酸性石英闪长(玢)岩为主,其次有闪长(玢)岩、花岗闪长岩和石英斑岩,其侵位时代为220Ma左右,为印支早期大规模钙碱性岩浆活动的产物。区内侵入岩属于钙碱性系列(偏钙性)中酸性侵入岩。岩浆演化过程中部分熔融和结晶分异对成岩过程均有影响。源区岩石是由63.75%下地壳与36.25%上地幔混合组成,其初始岩浆成因类型为深成同熔型,且初始岩浆是由源区岩石经过了F=63%的部分熔融形成,且岩浆经历了斜长石+角闪石±黑云母的分离结晶作用。依REE含量可将其分为两组(低REE组和高REE组),源区REE含量定量模拟计算表明矿区高REE组中酸性侵入岩为低REE组中酸性侵入岩经历了相对较高的结晶分异程度(59%)的产物。本区岩石的造岩矿物和全岩地球化学特征体现了区内钙碱性火成岩岩浆源区和岩浆演化既相似又存在不均一性。
Through the detailed studies of petrochemistry, rock-forming, chronology, trace elemental and isotopic geochemistry of intermediate-acidic instrusive rocks, This thesis tried to investigate the genesis and magamatic evolution of it. The time of the large-scale calc-alkaline magma instrusion events were preliminarily determined, and the models of partial melting and crystallization fractionation were used to determine the property of source magma and its evolution process with the following conclusions:The intermediate-acidic instrusive rocks in the Saishitang copper deposit mainly include intermediate to acidic quartz diorite (quartz dioritic porphyrite), then diorite (dioritic porphyrite)、granodiorite and quartz porphyry, formed in about 220Ma, as a result of the large-scale calc-alkaline magmatic activities of early Indosinian epoch. The intermediate-acidic instrusive rocks in Shaishitang copper deposit was shown to be hypogene syntexis-type with the parent magma formed by 63% partial melting degree from 63.75% of the lower crust content with 36.25% of the upper mantle material. And the magma experienced crystallization fractionation from low REE magma to REE-rich magma. Quantitative modeling calculations show that high REE granitoid rocks in Shaishitang copper deposit are products crystallized from the low REE intermediate-acidic instrusive rocks with a relatively high degree of crystallization fractionation (59%). Geochemical characteristics of the rock-forming minerals and whole rock petrochemistry show that the regional source being heterogeneous.
引文
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