内蒙古阿尔山侏罗纪火山沉积盆地地质特征及地球化学异常  

Geological Characteristics of Jurassic Volcano-sedimentary Basins and Geochemical Anomaly of Aershan Area,Inner Mongolia

作　　者：陈广义[1] 朱迎堂[1,2] 王洪黎 沈坤 田江飞[1] 

机构地区：[1]成都理工大学沉积地质研究院,成都610059 [2]成都理工大学地球探测与信息技术教育部重点实验室,成都610059 [3]河南省地勘局第一地质勘察院,南阳474200

出　　处：《地质与勘探》2009年第5期563-569,共7页Geology and Exploration

基　　金：内蒙古国土厅阿尔山等五幅1:5万区域矿产地质调查项目(编号:NMKD2006-08)资助

摘　　要：通过内蒙古阿尔山地区1∶5万区域矿产调查工作,研究了晚侏罗世火山沉积盆地的特征,及其与土壤地球化学异常的关系,认为侏罗纪火山沉积盆地、NE向断裂共同控制成矿元素富集及异常的分布。对阿尔山银江沟上侏罗统白音高老组实测剖面进行岩石光谱分析统计得出,盆地内Au、Cu、Zn、W、Mo、As、Sb、Hg、Mn、Ni含量均低于大陆岩石地层的克拉克值;Ag含量与大陆岩石地层的克拉克值相近;Sn、Bi、Pb含量高于大陆岩石地层克拉克值,其中Pb的含量是大陆岩石地层克拉克值的8倍,个别层位达到146倍。根据火山岩相、控矿构造和地球化学异常等特点,综合认为阿尔山侏罗纪火山沉积盆地具有Pb、Zn、W、Mo、Cu富集成矿的潜力,是重要的找矿目标区。Through 1：50,000 regional mineral survey at Aershan region of Inner Mongolia , characteristics of late Jurassic volcano- sedimentary basins and the relationships between them are studied, which shows that geochemical anomaly are controlled by volcano - sedimentary basins and NE - trending faults, the rock spectrum measurement of upper Jurassic Baiyingaolao Formation at Yinjiang ditch of Aershan shows that that Au, Cu, Zn, W, Mo, As, Sb, Hg, Mn, Ni contents in basins are lower than the continental lithostratigraphie Clark value. Ag contents are generally similar to that of continental crust. Sn, Bi and Pb are higher than the that of continental crust of Clark value, in which the contents of Pb is more than eight times higher than that of continental crust, some samples can reach one hundred and forty six times. Based on characteristics of comprehensive assessment criteria such as volcanic rocks, ore - controlling structure and geochemical anomalies, there is potential of mineralization at Jurassic volcano - sedimentary basins of Aershan area, therefore it is an important exploration target area.

关 键 词：内蒙古 阿尔山 侏罗纪 火山盆地 化探异常 

分 类 号：P534.52[天文地球—古生物学与地层学]