本文選題：巖石地球化學　切入點：流體來源　出處：《地質(zhì)與勘探》2017年01期

【摘要】：扎西康礦床位于北喜馬拉雅成礦帶內(nèi),是目前該帶發(fā)現(xiàn)的唯一一例大型規(guī)模的Sb-PbZn-Ag礦床,該礦床也成為了國內(nèi)學者研究的熱點。但迄今為止,礦床研究工作中非常重要的問題——礦床成因,尚未得到解決,目前存在的礦床成因觀點達四種之多。本文基于成礦流體來源在解決礦床成因問題研究中的重要地位,通過對扎西康礦床15號地質(zhì)剖面開展巖石地球化學立典研究,并結(jié)合礦體中主成礦元素的分帶特征,發(fā)現(xiàn)SiO_2、Al2O_3、CaO、TiO_2、Ba、Sr、Co、Ni、∑REE等主要分布在炭質(zhì)板巖(圍巖)中,而Fe-2O_3、FeO、MnO、Cu、Sn、δEu主要分布在Sb-Pb-Zn-Ag礦體中;提出扎西康SbPb-Zn-Ag礦體由深部至淺部,成礦元素的分帶為Sn→Cu→Zn→Pb+Ag→Sb,具有較明顯的由高溫向低溫的演化規(guī)律,重塑了扎西康礦床成礦流體沿著斷層破碎帶向上運移的演化路徑。通過對扎西康礦床成礦流體的演化規(guī)律研究,文章認為該礦床成礦流體主要來源于巖漿熱液,在演化過程中有大氣降水的參與,并受到了炭質(zhì)板巖的改造。根據(jù)本文對扎西康礦床成因的認識,得出扎西康礦床與廣西大廠錫礦以及湖南香花嶺錫多金屬礦較為相似的認識,建議礦區(qū)下一步找礦重點為深部的錫礦體。
[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，

本文編號：1681908