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REE Compositions of Lower Ordovician Dolomites in Central and North Tarim Basin,NW China:A Potential REE Proxy for Ancient Seawater 被引量:3
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作者 ZHANG Xuefeng HU Wenxuan +6 位作者 JIN Zhijun ZHANG Juntao QIAN Yixiong ZHU Jingquan ZHU Dongya WANG Xiaolin XIE Xiaomin 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2008年第3期610-621,共12页
Rare earth element compositions of Lower Ordovician dolomites in the Central and Northern Tarim Basin are studied. Most dolomite samples are more or less contaminated by clay minerals. Their rare earth element composi... Rare earth element compositions of Lower Ordovician dolomites in the Central and Northern Tarim Basin are studied. Most dolomite samples are more or less contaminated by clay minerals. Their rare earth element compositions have been consequently changed, showing both seawater-like and non-seawater-like features. The clay contamination should be disposed before the REE data are used. Through ICP-MS and ICP-AES analyses, the REE features are well documented. The clay contamination is quantitatively determined by microscopic investigation, trace elements and REE contents. The dolomites, at least in the Tarim Basin, are thought to be pure when their total LREE contents are less than 3×10^-6. Through comparison, the pure dolomites show similarities in REE patterns but differences in REE contents with co-existing pure limestone, which indicates that dolomitization may slightly change the REE compositions. Nevertheless, whatever the change is, the pure dolomites may act as a potential REE proxy for Ordovician seawater, which would be significant for ancient massive dolomite strata that lack limestone. 展开更多
关键词 DOLOMITE REE clay contamination Tarim Basin
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