摘要
锡铁山铅锌矿床为海底喷流沉积为主兼后期迭加改造的矿床。研究表明,矿体元素在纵向上从盆地边缘—近边缘—盆地中心—喷流口部位,出现由低温Hg、S r、B a、Cu—中低温Hg、S r、B a、B、A g、A u、M n、Cu、Pb、Zn—中高温Pb、Zn、A g、A u、Cu、Sn、B i、A s—高温Cu、B i(Pb、Zn)的分带,并且以喷流口为中心,两侧盆地呈对称状态。矿体垂向上晕的表现为Cu、Pb、Zn、Sn、B i、A s、A u等中高温元素紧裹着矿体,Co、N i、C r对称地分布在两侧,B a(Hg)呈宽缘晕如帽式样分布在矿体前缘,为一种紧裹型镜相对称的帽式结构。元素轴向分带序列为(由上至下):B-B a-Hg-(S r-C r)-N i-Cu-Zn-A u-M o-B i-A s-Pb-M n-Sn-Co-A g-Sb-(N i),前缘晕元素为B a、B、Hg、S r,矿体尾部元素为Co、N i、C r。在此基础上建立了矿床综合地球化学异常模式及找矿评价指标。
The Xitieshan lead-zinc deposit is a type of submarine spout sedimentary deposit with superimposed reconstruction during later period. Research shows that the ore element combination zoning is changing from Hg,Sr,Ba,Cu of low temperature to Hg,Sr,Ba,B,Ag,Au,Mn,Cu,Pb,Zn of low to moderate temperature to Pb, Zn, Ag, Au, Cu, Sn, Bi, As of moderate to high temperature and then. to Cu, Bi （Pb. Zn） of high temperature from the margin of basin to near margin . and to the center of the basin, then to the spouting part longitudinally and centered at the spouting part. showing a symmetry state on both sides of the basin. Vertically halos of the moderate to high temperature elements such as Cu,Pb,Zn,Sn,Bi,As,Au closely wrap the orebody. Co,Ni,Cr distribute on sides symmetrically. Ba （Hg） distributes at the front of the orebody as a cap. This is a wrapping type symmetric cap structure with an axial zoning sequence of front halo of Ba,B, Hg,Sr and the elements at the rear of the orebody are Co,Ni,Cr. An integrated geochemical anomaly model of the deposit and evaluation indicators for exploration are set up based on the above evidences.
出处
《矿产与地质》
2005年第6期710-714,共5页
Mineral Resources and Geology
关键词
地球化学
异常模式
分带序列
找矿指标
铅锌矿床
锡铁山
青海
zoning sequence, anomaly model, prospecting indicator, geochemistry, lead and zinc deposit, Xitieshan, Qinghai
