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Hydrothermal activities and seawater acidification in the Late Devonian F-F transition:Evidence from geochemistry of rare earth elements

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Science China Earth Sciences 2011年第4期54卷 540-549页

作者： ZENG JianWei XU Ran GONG YiMing Key Laboratory of Biogeology and Environmental Geology of Ministry of Education & State Key Laboratory of Geological Processes and Mineral Resources China University of Geosciences Wuhan 430074 China Institute of Resources and Environment Key Laboratory of Biogenic Traces & Sedimentary Minerals of Henan Province Henan Polytechnic University Jiaozuo 454003 China

Rare-earth dements （REE） in limestones were measured by ICP-MS from the Yangdi section across the Frasnian-Famennian （F-F） transition in Guilin, Guangxi of South China. The average EREE contents of measured samples are 33.32 ppm. The average LREE/HREE ratio is 6.35. Data show LREE-enriched REE distribution pattern in the Yangdi section. Most of samples are characterized by positive Eu anomaly with average of 1.13, and there are two maxima of Eu anomaly just below the F-F boundary. Almost all analytical samples show obvious tetrad effects. Remarkable M-shaped tetrad effects are observed in these samples with positive Eu anomaly. The characters of REE and some relative elements （Fe, Mn, Al, etc.） indicate that hydro- thermal activities occurred and resulted in seawater acidification in Upper and Lower Kellwasser horizons of the Late Devonian. The changes of marine environment caused by hydrothermal activities, such as seawater acidification, heavy metal pollution, and eutrophication, would destroy the neritic ecosystem and finally result in the F-F mass extinction.

关键词： Devonian mass extinction REE hydrothermal activities tetrad effects seawater acidification

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Geochemical Characteristics of Rare Earth Elements of Guidong Granitic Complex and Relationship with Uranium Mineralization

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Journal of Rare Earths 2007年第S2期25卷 313-319页

作者：张展适华仁民刘晓东邓平吴烈勤 Key Laboratory of Nuclear Resources and Environment (East China Institute of Technology) Ministry of Education State Key Laboratory for Mineral Deposit Research Nanjing University No.290 Research Institute China National Nuclear Corporation

Guidong granitic complex is constituted by Luxi intrusion, Xiazhuang intrusion, Maofeng intrusion, Sundong intrusion, Aizi intrusion and Siqian intrusion, which emplaced in Indosinian and early Yanshanian Periods. These intrusions varied from each other not only in major element content, aluminium saturation index, but also in values of ∑REE, δEu, and LREE/HREE, (La/Yb)N, (La/Sm)N and (Gd/Yb)N. The Maofeng intrusion, which has the closest relationship with uranium mineralization, belongs to strong peraluminous granites. Having undergone much intense fluid-rock interaction, it is characterized by typical M-type tetrad effects and lowest values of ∑REE, δEu, LREE/HREE, (La/Yb)N, (La/Sm)N and (Gd/Yb)N ratios than other studied intrusions.

关键词： Guidong granitic complex fluid-rock interaction tetrad effects uranium mineralization Maofeng intrusion Rare earths

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Geochemical Characteristics of Rare Earth Elements of Guidong Granitic Complex and Their Relationship with Uranium Mineralization

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Journal of Rare Earths 2005年第6期23卷 731-731页

作者： Zhang Zhanshi Hua Renmin Liu Xiaodong Deng Ping Wu Lieqin State Key Laboratory for Mineral Deposit Research Nanjing University Nanjing 210093 China Department of Geosciences and Geomatics East China Institute of Technology Fuzhou 344000 China Research Institute No. 290 Bureau of Geology China National Nuclear CorporationShaoguan .512026 China

The Guidong granitic complex is constituted by Luxi pluton, Xiazhuang pluton, Maofeng pluton, Sundong pluton, Aizi pluton and Siqian pluton, which intruded in Indosinian and early Yanshanian Periods. These plutons varies from each other not only in major element content, aluminium saturation index, but also in ∑REE, δEu, and LREE/HREE, （La/Yb）N, （La/Sm） N and （Gd/Yb） N ratios. Uranium mineralization is mainly hosted by strong peraluminous granites, which has undergone intense fluid-rock interaction, and their REE compositions are characterised by M-type tetrad effects and lower ∑REE, δEu value, LREE/HREE, （La/Yb） N, （La/Sm） N and （Gd/Yb） N ratios.

关键词： Guidong granitic complex fluid-rock interaction tetrad effects uranium mineralization Maofeng pluton rare earths

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