新疆东天山康古尔金矿构造叠加晕特征及矿床成因

发布时间：2018-03-26 10:12

本文选题：康古尔金矿　切入点：构造叠加晕　出处：《中国地质大学(北京)》2015年硕士论文

【摘要】：康古尔金矿位于新疆东天山秋格明塔什—黄山韧性剪切带西段南缘,赋矿岩石主要为下石炭统雅满苏组钙碱性火山岩、火山碎屑岩等。本文通过钻孔和井下坑道系统采样,研究了康古尔金矿不同成矿阶段的矿床元素组合、元素之间的相关性、元素垂向分带序列、构造叠加晕特征等,最后建立了构造叠加晕模型并进行了深部盲矿预测。同时,通过从矿区岩(矿)石主量元素、微量元素、稀土元素特征及H、O、Pb、S同位素特征等方面分析了康古尔金矿的矿床地球化学特征、控矿因素、成矿流体特征及来源、成矿物质来源等,并研究了成岩时代、成矿时代与区域构造演化之间的耦合关系,总结了矿床成因和矿床模型。论文取得了以下主要成果和认识:(1)通过对矿石微量元素进行相关分析发现Hg与Au的相关系数达0.61,可将Hg作为康古尔金矿找矿的重要指示元素。Au与Pb、Zn也具有较高的相关性,而Cu与其他元素相关性弱且主要分布于金矿下部,推测铜矿的形成可能为另一期成矿事件。(2)查明康古尔金矿单一期次成矿成晕轴向分带序列,As、Sb、Hg(前缘晕)→Au、Ag、Cu、Pb、Zn、Cd(近矿晕)→Bi、Mo、Mn、Co、V、W(尾晕),以及元素垂向分带序列为Hg-Pb-Zn-Bi-Co-Mo-Mn-Au-Sb-As-Ag-Cd-W-V-Cu,为“反分带”序列,指示成矿作用有叠加。(3)岩矿石微量元素、稀土元素及Pb、S同位素特征等表明成矿物质来源主要是次火山岩,另外地层提供了部分成矿物质,次火山岩的侵入为主要的控矿因素,Pb、S主要来源于地幔。(4)成岩时代、成矿时代与区域构造演化之间的耦合关系表明康古尔金矿为两期成矿作用,成矿主因分别为早二叠世次火山岩的侵入和晚二叠世秋格明塔什—黄山韧性剪切带右行走滑剪切作用,结合H、O同位素特征认为成矿流体演化具有火山次火山热液为主→混合热液→大气降水为主的演化趋势,综合认为康古尔金矿为受韧性剪切带控制的产于火山岩次火山岩中的造山带型中低温热液矿床。
[Abstract]:The Kangguer gold deposit is located in the southern margin of Qiugingtash-Huangshan ductile shear zone in eastern Tianshan, Xinjiang. The ore-bearing rocks are mainly calc-alkaline volcanic rocks and pyroclastic rocks of the Yamensu formation in the Lower Carboniferous. The element assemblages, the correlation among elements, the vertical zoning sequence of elements, the characteristics of structural superimposed halo in Kangguer gold deposit at different metallogenic stages are studied. Finally, the structural superimposed halo model is established and the deep blind ore is predicted. The geochemical characteristics, ore-controlling factors, ore-forming fluid characteristics and ore-forming material sources of Kangguer gold deposit are analyzed from the main elements of rock (ore), trace elements, rare earth elements and the isotopic characteristics of HGO _ O _ (P _ (b)) S, etc. The coupling relationship between diagenetic age, metallogenic age and regional tectonic evolution is also studied. This paper summarizes the genesis and model of ore deposits. The paper has obtained the following main achievements and understanding: (1) through the correlation analysis of trace elements in ore, it is found that the correlation coefficient between Hg and au is 0.61, which can be regarded as an important prospecting for Kangguer gold deposit. There was also a high correlation between the indicating element. Au and PBO Zn. The correlation between Cu and other elements is weak and mainly distributed in the lower part of the gold deposit. It is speculated that the formation of copper deposit may be another metallogenic event. 鈫扐u-Ag-Ag-CU PbPbPbPbCU (near Ore Halo). 鈫扵he vertical zonation sequence of elements is Hg-Pb-Zn-Bi-Co-Mo-Mn-Au-Sb-As-Ag-Cd-W-V-Cu, indicating that the ore-forming process has superimposed ore trace elements, rare earth elements and PBS isotopic characteristics, indicating that the ore-forming material is mainly derived from subvolcanic rocks, and the vertical zonation sequence of elements is Hg-Pb-Zn-Bi-Co-Mo-Mn-Au-Sb-As-Ag-Cd-W-V-Cu, indicating that the ore-forming process has superimposed ore trace elements, rare earth elements and PBS isotopic characteristics. In addition, the strata provide part of the ore-forming material, and the subvolcanic intrusion is the main ore-controlling factor (PbPbSs). The coupling relationship between the metallogenic age and the regional tectonic evolution indicates that the Kangguer gold deposit is a two-stage metallogenic process. The main metallogenic factors are the intrusions of early Permian subvolcanic rocks and the right-strike-slip shear of late Permian Qiugingtash-Huangshan ductile shear zone. Combined with the Hau O isotopic characteristics, the ore-forming fluid evolution is dominated by volcanic subvolcanic hydrothermal solution. 鈫扢ixed hydrothermal solution. 鈫扞t is considered that Kangguer gold deposit is a middle-low temperature hydrothermal deposit controlled by ductile shear zone in volcanic subvolcanic rocks.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.51

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