银岩锡矿床找矿信息层次模型

STAGE MODEL OF EXPLORATION INFORMATION OF YINYAN TIN DEPOSIT

本文在研究广东银岩区域地质地球化学背景、矿床晕及矿体晕特征,分层次提出找矿信息的基础上,综合出银岩锡矿床找矿信息层次模型。

Yinyan tin deposit is obviously controlled by the granite porphyry in spatial distribution and genetic relationship. The exposed strata are mainly pre-Devonian metamorphic rocks. The tin-bearing cylinder-like granite porphyry is a concealed stock, some dikes of quartz porphyry are seen on the surface. The manifestations of alteration in the intrusion and its wall rock are characterized by the occurence of many alteration types and distinguishable alteration zones. Yinyan Tin deposit is characterized by great dimensions and intense contrast of anomalies, and multitudinous indicator elements. There is a clear zonation of concentration and composition of primary anomalies. The geochemical behavior of K2O, Na2O and Ba, and Ⅴ is influenced principally,the content of K2O and Na2O increase, But Ba and Ⅴ decrease from top to bottom. So, (BaV x 108) / (K2O Na2O) can be used to discriminate different alteration the vertical zoning sequence, the zonality coefficient of (Cu Pb Ag× 104)/ (Li Sn Be) can be used for assessment of the exposure of level of erosion of geochemical anomalies and the provision of some discriminant criteria which can be cnosen for prognostication of the depth of the hidden orebody. The full information of Yinyan tin deposit is placed emphasis on here. The geological and geochemical settings, some characteristics of the deposit halo and ore halo are summarized. Exploration information is put up , and stage concept model is developed.