云南富宁两期基性岩地球化学性质与金矿成矿
Geochemical Characteristics of Two Stages of Basic Dykes and Gold Mineralization at Funing,Yunnan Province,China
查看参考文献78篇
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文摘
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基性岩与金矿的关系一直备受关注。本文研究了富宁周边分布的2期基性岩,以及该地区的几个大型金矿。结果表明,早期基性岩的U-Pb年龄为(258±5) Ma,与前人研究成果相吻合,认为富宁早期基性岩与峨眉山地幔柱相关。晚期基性岩~(206)Pb /~(238)U年龄为(219.9±6.6) Ma (MSWD = 1.2),与早期基性岩差异明显。晚期基性岩的主微量和稀土元素研究均显示可能存在俯冲物质混染,熔体源区为富集岩石圈地幔端元(EMORB)和亏损岩石圈地幔端元(N-MORB)部分熔融的混合产物。结合前人对该地区构造活动的研究,认为晚期基性岩来源于地幔并受俯冲物质污染。矿相学与地球化学的研究显示,2期基性岩对于金矿的形成均有贡献,早期基性岩提供了有限的作用,而晚期基性岩年龄与该区几个大型金矿成矿年龄大致相吻合,结合地球化学分析与前人研究,认为晚期基性岩除了大量萃取地层成矿物质外,也是成矿流体循环成矿的重要热源,加之频繁的构造活动对早期矿床的叠加成矿作用,最终形成该区的几个大型金矿。因此晚期基性岩与该区金矿成矿有密切关系,是该区下一步寻大矿揪小矿的重要标志。 |
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其他语种文摘
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The relationship between basic rocks and gold deposits has always been paid much attention. In this paper, two basic dykes and several large gold deposits in the Funing area have been studied. The results show that,the U-Pb age of 258±5 Ma for the early basic rock is consistent with those of previous studies which had shown that the early basic rock in the Funing area was associated with the Emeishan mantle plume. The ~(206)Pb /~(238)U age of 219.9±6.6 Ma (MSWD= 1.2) for the late basic rock suggest that it is significantly different from the early basic rock. The study on the major,trace,and rare earth elements of the late basic rock shows that there could be subduction material contamination for the magma which was a mixture of melts derived from the partial melting of the enriched lithospheric mantle (E-MORB) and the depleted lithospheric mantle (N-MORB). Combined with previous researches on the tectonic activity in the region,it was concluded that the late basic rock was derived from the mantle and contaminated by subduction materials. A comprehensive study of mineralography and geochemistry shows that the basic rocks of two stages had contribution to the formation of gold deposits. The early basic rock played a limited role for the gold mineralization. Due to the age of the late basic rock is roughly coincided with the metallogenic ages of several large gold deposits in the region,with the combination of the geochemical analyses and previous studies,it is believed that the late basic rock has provided not only ore-forming materials mainly extracted from strata,but also an important heat source for the metallogenic fluid circulation and mineralization. Together with superposed mineralization of frequent tectonic activities on early deposits,several large gold deposits were finally formed in this area. Therefore,we think that the late basic rock could be closely related to the gold mineralization in this region,and it is an important sign for further exploring various sized gold deposits in the area. |
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来源
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矿物学报
,2018,38(5):499-513 【核心库】
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DOI
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10.16461/j.cnki.1000-4734.2018.38.231
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关键词
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基性岩
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U-Pb定年
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地球化学特征
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岩石成因
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金矿
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地址
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1.
桂林理工大学地球科学学院, 广西, 桂林, 541004
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桂林理工大学, 广西隐伏金属矿产勘查重点实验室, 广西, 桂林, 541004
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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实验室, 贵州, 贵阳, 550081
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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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国家自然科学基金项目
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广西自然科学基金
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国家自然科学基金项目
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广西自然科学基金
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广西高等学校高水平创新团队及卓越学者计划
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文献收藏号
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CSCD:6452549
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