石榴石-黑云母地质温度计在四川拉拉铜矿床的应用
APPLICATION OF THE GARNET-BIOTITE GEOTHERMOMETER IN THE LALA COPPER DEPOSIT, SICHUAN PROVINCE
查看参考文献29篇
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文摘
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在晋宁运动中,拉拉铜矿床区发生了大规模的区域变质作用,由于其变质条件的资料较少,使得人们对矿床的成因机制存在诸多争论.采用石榴石-黑云母地质温度计和多硅白云母地质压力计,结合电子探针分析结果,对矿区内广泛出露的石榴石黑云母片岩进行了研究,得到区域变质作用的变质温度为500～560 ℃,变质压力上限为0.6～0.73GPa,变质程度为高绿片岩相.同时,根据野外观测及室内研究并结合前人工作,认为矿床主要存在两个成矿期次,即火山-喷气沉积成矿期和变质热液成矿期. |
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其他语种文摘
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The Lala copper deposit underwent a significant regional metamorphism during the Jinningian period.Because of the lack of data concerning the metamorphic conditions,there are still some controversies about the ore-forming mechanism.On the basis of the result of electron microprobe analysis for garnet-biotite schist which occurs widely in the deposit,the calculated metamorphic temperature is 500-560℃ and the upper limit of pressure is 0.6-0.73GPa,using the garnet-biotite geothermometer and geobarometry of Si in phengite.This metamorphic event mainly corresponds to high greenschist facies.As a result,in combination with previous work,we concluded that the Lala copper deposit was formed at two main ore-forming stages: the volcanic exhalative-sedimentary stage and the metamorphic-hydrothermal stage. |
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来源
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矿物学报
,2008,28(2):127-134 【核心库】
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关键词
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石榴石-黑云母地质温度计
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多硅白云母地质压力计
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电子探针
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变质条件
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成矿机制
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地址
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中国科学院,地球化学研究所, 矿床地球化学国家重点实验室, 贵州, 贵阳, 550002
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1000-4734 |
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学科
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地质学 |
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基金
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中国科学院“百人计划”项目
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文献收藏号
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CSCD:3266923
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