甘肃省成县李家沟层控铅锌矿床原生地球化学异常特征及其找矿意义

本文研究了甘肃省成县李家沟层控铅锌矿床的原生地球化学异常特征及找矿标志。根据矿区各种岩石中化学元素的分布和分配,相关性和组合特征的分析,提出了一些无机和有机地球化学相结合的找矿标志。为了研究矿床剥蚀程度的判断标志,文中探讨了化学元素的含量、比值、相关性和组合特征在矿体不同部位上的变化。对成晕元素的共生组合和原生晕在空间上的分布进行了研究,并且根据分带指数的计算确定了矿床原生晕指示元素的垂向和水平分带序列,这些研究将有助于这一类型矿床的找矿和评价工作。最后,本文还探讨了层控矿床和典型热液矿床原生异常的一些差异性。

CHARACTERlSTICS OF PRIMARY GEOCHEMICAL ANOMALIESFROM THE LIJIAGOU STRATABOUND Pb-Zn DEPOSlT INCHENGXIAN COUNTY,GANSU PRQVINCE AND THEIRORE-PROSPECTING SIGNIFICANCE

This paper deals with characteristics of primary geochemical anomaliesfrom the Lijiagou stratabound Pb-Zn deposit in Chengxian county, Gansu pro-vince and the ore-prospecting indicators. According to the distribution of che-mical elements in various rocks of the ore district and an analysis of theircorrelationship and combination characters, the authors propose some ore-pro-specting indicators which combine inorganic chemistry with organic chemistry.In order to find criteria for denudation extent of the deposit, the paper inves-tigates variations of contents, ratios, correlationship and combination charactersof chemical elemeuts in different parts of the orebody. The association of halo-forming elements and the spatial distribution of primary halos are studied and,on the basis of zonality index calculations, the vertical and horizontal zoningsequences of indicator elements in primary halos are determined. All these in-vestigations contributes to the ore-prospecting and evaluation of this type ofore deposits. Finally, the paper makes a tentative discussion on the differencesin primary anomalies between stratabound deposits and typical hydrothermaldeposits.