摘要
对比研究公婆泉铜矿生物地球化学异常与原生异常后发现 :产生生物地球化学异常的元素通常是那些在原生异常中强度高且浓度系数较大的元素 ,植物本身对元素的生理吸收特性对元素异常的形成也有重要影响。二者异常组合分带的共同特点是在矿化中心都存在Cu、(Pb)、Au、Ag异常 ,向外都存在Ba、B、As、(Sb)异常 ,最外带则都有Ti、V等异常。比较花岗闪长斑岩和英安斑岩铜矿体的生物地球化学异常 ,前者元素的种类多 ,且内带出现原生晕的中下部或尾晕元素Sn、W等 ,反映其为浅偏中等剥蚀 ;后者元素的种类少 ,内带未出现中下部或尾晕元素 ,反映其为浅剥蚀。建立的铜矿床 (体 )生物地球化学找矿预测模式能为定位预测戈壁覆盖层下的隐伏矿床 (体 )并推断其剥蚀程度和矿体规模提供重要的科学依据。
Comparisons of biogeochemical anomalies to primary anomalies discovered that the elements producing biogeochemical anomalies are usually those high in intensity with the biggest concentration coefficient in primary anomalies, and the formation of biogeochemical anomalies is affected by physiological absorption character of plant itself, and compositional zoning of biogeochemical anomalies and primary anomalies is a common feature of existing anomalies of Cu, (Pb) Au, Ag, in the ore center, Ba, B, As, (Sb) outside and Ti,V, etc. on the ragged edge of zoning. The biogeochemical anomalies upon copper ore in granodiorite porphyry contain more kinds of element, Sn,W, etc. appear as mid below or subore primary halos in the inner zone, therefore, it is reflected at shallow moderate denudatic depth. The biogeochemical anomalies upon copper ore in dacite porphyry contain less kinds of element, no elements appear as mid below or subore primary halos in the inner zone. Therefore, it is reflected at shallow denudatic depth. The biogeochemical prognostic model for the denudatic depth and deep dimention of copper ore deposits has been established, and by this model concealed ore bodies can be predicted.
出处
《地质地球化学》
CSCD
2002年第2期40-45,共6页
Geology-Geochemistry
基金
国家计委"九五"科技找矿项目 (JG947190 1)
