摘要
以贵州龙场地区水系沉积物中的Pt、Pd异常为研究对象,选择相容性接近的7对元素比值Cr/Ni、Nb/Ta、Pd/Pt、Rb/Cs、Sr/Ba、Th/U和Zr/Hf以及CaO、TFe2O3作为地球化学示踪指标,对龙场地区水系沉积物的物质来源组成进行了示踪探讨。结果表明:(1)龙场地区水系沉积物的物质来源主要为玄武岩风化产物,其中的高含量Pt、Pd是对玄武岩层中Pt、Pd高背景的继承和进一步浓缩富集;(2)根据对分布在灰岩区的水系沉积物物质来源的地球化学示踪研究,推测部分样品的物质来源应为玄武岩和灰岩风化产物;(3)根据对红岩村的水系沉积物物质来源的示踪研究,推断有热液活动和基性-超基性侵入体的物质成分,预测该地区具有一定的找矿远景。
The anomalies of Pt and Pd in stream sediment in Longchang area, western Guizhou Province are considered as objects of study, and seven couples of compatibility elements (Cr/Ni, Nb/Ta, Pd/Pt, Rb/Cs, Sr/Ba, Th/U and Zr/Hf) and CaO, TFe2O3 are selected as indicators of geochemical trace. Geochemical trace of the material source of stream sediment in Longchang area is discussed. The results indicate that the material source of stream sediment there derived from the weathering products of basalt, the anomalies of Pt and Pd in stream sediment are a extension to and enrichment of the high background of Pt and Pd of basalt. The geochemical trace study of compatible and incompatible elements for stream sediment samples distributed on limestone area and field geological investigation discover that the material source of some stream sediment samples is derived from the weathering products of basalt and limestone. The geochemical trace for material source of stream sediment in Hongyan area find that the anomalies of Pt and Pd in stream sediment in Hongyan area are due to hydrothermal activity, and basic and ultrabasic intrusion. A prediction with Pt potential is made in Hongyan area.<P>
出处
《地球化学》
CAS
CSCD
北大核心
2003年第2期193-200,共8页
Geochimica
基金
国土资源部"九五"一般科技项目(992034)
国土资源大调查项目(F.8.1.3
200120130090)
国家重点基础研究发展规划项目(G1999043212)
关键词
水系沉积物
地球化学示踪
元素相容性
贵州
铂
钙
玄武岩
stream sediment
anomaly source of Pt and Pd
geochemical trace
element compatibility
Longchang
Guizhou Province
