滇西北羊拉铜矿床构造体系及其控岩控矿作用
Ore-field structural system and its mechanism of rock-and ore-controlling processes of Yangla Cu deposit in northwest Yunnan, China
查看参考文献38篇
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文摘
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羊拉铜矿床是我国西南“三江”多金属成矿域内矽卡岩–斑岩型矿床的典型代表,为滇西北金沙江缝合带中生代构造–岩浆–成矿事件的产物。该矿床构造发育,形成了一套褶皱–断层控岩控矿体系。本文运用矿田地质力学方法对羊拉铜矿床构造形迹的几何学、运动学和力学性质进行解析,建立羊拉铜矿床的构造体系及其控岩控矿模式。结果表明:自海西期→印支期→燕山期→喜马拉雅期,羊拉铜矿床主压应力经历了东西向→北西向→北西向→(北东向→近东西向)的转变,依次形成了早南北构造带、北东构造带(早–晚)、(北西构造带和晚南北构造带)。早南北构造带为羊拉铜矿床控岩控矿构造的基础,早北东构造带为控制矽卡岩–斑岩成矿系统的主导构造,晚北东构造带、北西构造带和晚南北构造带为破岩破矿构造。根据构造体系及其控岩控矿作用,认为羊拉铜矿床构造控岩控矿模式为海西期“层间断裂”+印支期“侵入接触构造”+燕山期“λ字型构造”+喜马拉雅期“阶梯状构造”。 |
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其他语种文摘
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The Yangla Cu deposit is located in northwest Yunnan, China and formed during the Mesozoic structure-magma-mineralization events, is one of the typical skarn-porphyry deposits in the Jinshajiang suture zone, “Sanjiang” polymetallic metallogenic domain. Well developed structures in the Yangla Cu deposit composed a typical folds-faults rock- and ore-controlling structural system, which constituted the skarn-porphyry metallogenic system. In this paper, the theory and method of ore-field geomechanics are used to analyze the geometry, kinematics and mechanical property of the structure traces in the Yangla Cu deposit, and to determine the ore-field structural system and its mechanism of rock-and ore-controlling model. The results show that the Yangla Cu deposit mainly experienced transformation of main constructional compressive stress from EW- to NW- to NW- to (NE- to nearly EW) trending, and formed the early NS, NE (early to late), NW, late NS structure belts in turn, since the Hercynian→Indochina→Yanshanian→Himalaya, and affected the Jianshajiang suture zone and Indian-Eurasian plates. It is believed that the early NS structure belt was the rock- and ore-controlling structural framework system in the Hercynian. The early NE structure belt was provided a favorable structural setting for the skarn-porphyry metallogenic system, which was the dominant ore-controlling structural system in the Indochina. In contrast, the late NE structure belt destroyed the rock and ore-bodies, which belong to rock- and ore-breaking structure in Yanshanian. The NW and late NS structure belts also destroyed the intrusions and ore-bodies, and belong to the rock- and ore-breaking structure in Himalaya. The corresponding structure rock- and ore-controlling model are successively the “Interlayer Faults” of the Hercynian, “Intrusion into Contact Faults” of the Indochina, “λ-Type Faults” of the Yanshanian, and “Stair-Step Faults” of the Himalaya, which based on the structural system and its rock- and ore-controlling structure type. |
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来源
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中国有色金属学报
,2021,31(9):2596-2611 【核心库】
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DOI
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10.11817/j.ysxb.1004.0609.2021-39775
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关键词
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构造体系
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控岩控矿构造
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构造控矿模式
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羊拉铜矿床
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滇西北
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地址
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昆明理工大学国土资源工程学院, 昆明, 650093
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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, 贵阳, 550002
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中国有色金属工业昆明勘察设计研究院有限公司, 昆明, 650051
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云南迪庆矿业开发有限责任公司, 香格里拉, 674400
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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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1004-0609 |
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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
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云南省万人计划青年拔尖人才项目
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昆明理工大学重点学科建设项目
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文献收藏号
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CSCD:7099603
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