河南省大河沟锑矿床构造-流体与低温成矿
发布时间：2019-01-25 19:40
【摘要】：大河沟锑矿床分布在中元古界秦岭群变质岩内,矿体产出受双槐树深大断裂及其旁侧断裂控制,是一个构造控矿因素明显的低温热液矿床。为了深入探索它的成矿构造与成矿元素富集的有机联系及成矿机理,选择矿床内典型构造岩开展了构造岩特征和矿石的主微量元素、矿石矿物学、同位素地球化学和包裹体测试等分析。研究结果表明:矿床分布受区域韧性剪切带的控制,矿体围岩的糜棱岩化时限198.6"4.74Ma,并具有成矿元素矿源层的性质;辉锑矿可能在单一环境和封闭条件下形成,有独特的辉锑矿晶体特征峰值,含高的As、Au、Ag、Mo、Hg、Pb和Zn元素;方解石矿物的C—O同位素属于岩浆-地幔来源;辉锑矿硫同位素的值域为δ34S介于1.8‰~2.6‰之间,铅同位素显示地层铅的变化与辉锑矿相近;包裹体成分的测定表明流体具有硫酸盐的性质,局部为重碳酸根型水溶液,以热液改造沉积卤水为特征,成矿作用在还原条件下进行,石英包裹体中含有较高的H2暗示成矿流体具有深源性质。综合研究认为,矿床形成作用是深部热流体沿深大断裂活动,萃取了韧性剪切变形构造带中活动的金属元素,然后在还原条件和低温环境中沉淀成矿,成矿类型厘定为构造-流体制约的变质型矿床。
[Abstract]:The Dahegou antimony deposit is distributed in metamorphic rocks of Qinling Group in the Middle Proterozoic. The orebody is controlled by Shuanghuashu deep fault and its adjacent faults. It is a low temperature hydrothermal deposit with obvious structural ore-controlling factors. In order to explore the organic relation between metallogenic structure and ore-forming element enrichment and its metallogenic mechanism, the characteristics of tectonite and the main trace elements of ore and ore mineralogy were selected. Isotopic geochemistry and inclusion testing. The results show that the distribution of the deposit is controlled by the regional ductile shear zone, and the mylonization time of the surrounding rock of the orebody is 198.6 "4.74 Ma.The ore deposit has the property of ore-forming element source bed. Stibnite may be formed in a single environment and closed conditions with unique peak crystal characteristics of stibnite containing high As,Au,Ag,Mo,Hg,Pb and Zn elements and C-O isotopes of calcite minerals belong to magma mantle source. The range of sulfur isotopes of stibnite is between 1.8 鈥，
本文编号：2415126
[Abstract]:The Dahegou antimony deposit is distributed in metamorphic rocks of Qinling Group in the Middle Proterozoic. The orebody is controlled by Shuanghuashu deep fault and its adjacent faults. It is a low temperature hydrothermal deposit with obvious structural ore-controlling factors. In order to explore the organic relation between metallogenic structure and ore-forming element enrichment and its metallogenic mechanism, the characteristics of tectonite and the main trace elements of ore and ore mineralogy were selected. Isotopic geochemistry and inclusion testing. The results show that the distribution of the deposit is controlled by the regional ductile shear zone, and the mylonization time of the surrounding rock of the orebody is 198.6 "4.74 Ma.The ore deposit has the property of ore-forming element source bed. Stibnite may be formed in a single environment and closed conditions with unique peak crystal characteristics of stibnite containing high As,Au,Ag,Mo,Hg,Pb and Zn elements and C-O isotopes of calcite minerals belong to magma mantle source. The range of sulfur isotopes of stibnite is between 1.8 鈥，
本文编号：2415126
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