镜铁山铁铜矿床热液沉积地球化学研究  

STUDY ON HYDROTHERMAL SEDIMENTARY GEOCHEMICAL NATURES OF IRON COPPER ORE DEPOSIT IN JINGTIESHAN, NORTHWEASTERN CHINA

作　　者：薛春纪[1] 张连昌[1] 刘华山[1] 李秋林 

机构地区：[1]成都理工学院资源与经济系,西安地质学院应用化学系,冶金部西北地勘局第五地质队

出　　处：《成都理工大学学报（自然科学版）》1996年第S1期1-7,共7页Journal of Chengdu University of Technology: Science & Technology Edition

摘　　要：镜铁山铁矿中新近发现并正在进行铜矿的勘探。这个矿床的含矿层虽然作为震旦系同生沉积体的一部分与地层整合产出，但它的化学组成明显不同于围岩，典型元素组合为：Ｆｅ—Ｃｕ—Ｓｉ—Ｂａ，热液沉积指示元素富集，Ｆｅ、Ｍｎ、Ａｌ、Ｔｉ、Ｐ、Ｙ等的相互关系可与现代洋底含金属热液沉积物较好类比；Ｓ、Ｃ、Ｏ、Ｐｂ同位素地球化学研究证明成岩成矿物质与地热系统中的深部流体有关，而非陆源风化物所能提供；成矿流体为酸性（ＰＨ＝４．８７—５．３７）、还原（Ｅｈ＝—０．２９Ｖ——０．５８Ｖ）热（１７５Ｃ）水；地球化学研究证明了该矿床的形成经历了（主期）海底热液同生沉积和（次期）后生热液叠加（对铜硫化物再富集有一定作用）两个过程。Copper ore bodies were discovered and have been explored in Jingtieshan lron Ore De-posit. Although the deposit' s.ore-bearing bed is one part of Sinian sedimentary system and concord with the stratum,its chemical compositions are eviently different form the wall rock and the typical ele-ment assemblage is Fe Cu Si Ba, It is rich in indicating elements of hydrothermal sediment and the relationships .of Fe、 Mn、 Al、 Ti、 P、 Y etc. are similar to that of mordern submarine metalliferous hy-drothermal sediments. The geochemical study of S、C、 O、Pb isotopes shows that the material of forming the rocks and the ore is relatd to a deep fluid in geothermal system and no continental waste could pro-vide. The mtallogenic fluid was a thermal (1 75 C ) water of acid (pH= 4. 87～ 5. 37 )and reduction (Eh = 0. 29v～ 0. 58v ). The geochemical studies well prove that the metallogenesis of the lron-Copper ore deposit existed two processes of (main )syngenetic submarine hydrothermal sediment and (minor) epigenetic hydrothermal superimposition (some effcts on the concentration of Copper-sulphide).

关 键 词：镜铁山 铁铜矿床 地球化学 热液沉积 

分 类 号：P618.41[天文地球—矿床学]