西藏扎西康矿区典型剖面岩石地球化学特征及地质意义
发布时间:2018-03-29 16:23
本文选题:岩石地球化学 切入点:流体来源 出处:《地质与勘探》2017年01期
【摘要】:扎西康矿床位于北喜马拉雅成矿带内,是目前该带发现的唯一一例大型规模的Sb-PbZn-Ag矿床,该矿床也成为了国内学者研究的热点。但迄今为止,矿床研究工作中非常重要的问题——矿床成因,尚未得到解决,目前存在的矿床成因观点达四种之多。本文基于成矿流体来源在解决矿床成因问题研究中的重要地位,通过对扎西康矿床15号地质剖面开展岩石地球化学立典研究,并结合矿体中主成矿元素的分带特征,发现SiO_2、Al2O_3、CaO、TiO_2、Ba、Sr、Co、Ni、∑REE等主要分布在炭质板岩(围岩)中,而Fe-2O_3、FeO、MnO、Cu、Sn、δEu主要分布在Sb-Pb-Zn-Ag矿体中;提出扎西康SbPb-Zn-Ag矿体由深部至浅部,成矿元素的分带为Sn→Cu→Zn→Pb+Ag→Sb,具有较明显的由高温向低温的演化规律,重塑了扎西康矿床成矿流体沿着断层破碎带向上运移的演化路径。通过对扎西康矿床成矿流体的演化规律研究,文章认为该矿床成矿流体主要来源于岩浆热液,在演化过程中有大气降水的参与,并受到了炭质板岩的改造。根据本文对扎西康矿床成因的认识,得出扎西康矿床与广西大厂锡矿以及湖南香花岭锡多金属矿较为相似的认识,建议矿区下一步找矿重点为深部的锡矿体。
[Abstract]:The Zaxikang deposit, which is located in the northern Himalayan metallogenic belt, is the only large scale Sb-PbZn-Ag deposit found in the belt at present. The important problem in ore deposit research is that the origin of ore deposit has not been solved, and there are as many as four kinds of views on genesis of deposit. This paper is based on the important position of the source of ore-forming fluid in solving the problem of genesis of ore deposit. Based on the study of rock geochemistry in section 15 of the Zaxikang deposit and the zonation characteristics of the main ore-forming elements in the orebody, it is found that SiO2Al2O3CaOTiOTiO2Al2O3CaOTiOTiO2Ba-BaOTiOCoCo-Ni, 鈭,
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