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研究基底与沉积盆地的关系,对于确定陆相(或亚陆相)环境碎屑物中重金属(Pb、Zn、Cu、U)的富集是有意义的。如果沉积物中的重金属是来源于基底(地球化学来源),那末,一直到剥蚀前,作用于基底的风化作用的影响是一个很重要的因素。从研究现代或古代风化壳剖面可看出,由于主要的风化作用对大陆的影响,每种重金属元素,或是被淋滤到盆地,或是被富集和暂时地积聚在风化壳中。对三个地区样品进行地球化学分析得出如下结论:风化时期积聚的重金属形成的工业矿床只见于砂岩岩系中,并且其地球化学的演变或分带可能是由于气象条件的演变或分带而造成的。从风化基底到碎屑盆地的这种地球化学继承性的理论,大大地改变了以前关于从基底到碎屑盆地的继承性的解释,如砂岩矿床有明显的单(二)金属特点。
Studying the relationship between basement and sedimentary basin is significant to determine the enrichment of heavy metals (Pb, Zn, Cu, U) in the continental (or sub-continental) environmental debris. If the heavy metals in the sediments are sourced from the basement (geochemical source), then the effect of weathering on the substrate until denudation is a very important factor. From the study of modern or ancient weathered crust profiles, it can be seen that due to the major weathering effects on the continent, each heavy metal element is either leached into the basin or enriched and temporarily accumulated in weathering crust. The geochemical analysis of the three regional samples concluded that the industrial deposits formed by the accumulation of heavy metals during weathering are found only in sandstone and that their geochemical evolution or zoning may be due to the evolution or zonation of meteorological conditions Caused. This geochemical inheritance from weathered basalts to detritus basins drastically changed previous interpretations of succession from basal to detrital basins, such as the obvious mono- (di-) metallic features of sandstone deposits.