REE Geochemical Study of the Permian-Triassic Marine Sedimentary Environment in Guizhou Province  

作　　者：南君亚  刘丛强  周德全  王筑明  

机构地区：[1]State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002 , China [2]Research Institution of Regional Geological Surveying, Guizhou Provincial Bureau of Geology and Mineral Resources, Guiyang 550005, China

出　　处：《Chinese Journal Of Geochemistry》2002年第4期348-361,共14页中国地球化学学报

基　　金：This research project was financially supported by the National Natural Science Foundation of China (GrantNos.94 6 2 5 30 4 ;4 99730 0 5 )

摘　　要：This paper deals with the REE geochemical characteristics of Permian\|Triassic marine carbonate rocks in Guizhou Province. It is found that there are two broad categories of stratigraphic units in the region studied in accordance with their ∑REE contents and REE distribution patterns: one is characterized by LREE enrichment and slight Ce depletion, with the REE distribution patterns similar to those of North American shales, and the other features relative HREE enrichment and relatively remarkable Ce depletion, with the REE distribution patterns close to those of pelagic sediments. In terms of their different ∑REE contents, five types of stratigraphic units can be distinguished. Incorporation of detrital minerals, REE complexing capability, oxidation\|reduction conditions of the media are the main factors affecting the REE composition and REE distribution patterns of marine carbonate rocks in the region studied. In the light of REE geochemical characteristics of carbonate rocks, coupled with sedimentary facies analysis , this paper discusses the characteristics of the Permian\|Triassic marine sedimentary environment in Guizhou Province and its evolutional rules.This paper deals with the REE geochemical characteristics of Permian\|Triassic marine carbonate rocks in Guizhou Province. It is found that there are two broad categories of stratigraphic units in the region studied in accordance with their ∑REE contents and REE distribution patterns: one is characterized by LREE enrichment and slight Ce depletion, with the REE distribution patterns similar to those of North American shales, and the other features relative HREE enrichment and relatively remarkable Ce depletion, with the REE distribution patterns close to those of pelagic sediments. In terms of their different ∑REE contents, five types of stratigraphic units can be distinguished. Incorporation of detrital minerals, REE complexing capability, oxidation\|reduction conditions of the media are the main factors affecting the REE composition and REE distribution patterns of marine carbonate rocks in the region studied. In the light of REE geochemical characteristics of carbonate rocks, coupled with sedimentary facies analysis , this paper discusses the characteristics of the Permian\|Triassic marine sedimentary environment in Guizhou Province and its evolutional rules.

关 键 词：二叠纪 沉积环境 稀土元素 贵州 三叠纪 海相沉积 地球化学 

分 类 号：P593[天文地球—地球化学]