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2007•Acta Mineralogica SinicaRequires access

GEOCHEMISTRY AND GEOLOGICAL IMPLICATIONS OF MAFIC-ULTRAMAFIC ROCKS AS OLD AS ～838 Ma IN THE DEXING AREA,NE JIANGXI

Long Guangming

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Abstract

Mafic-ultramafic rocks dated at ～838 Ma in the Dexing area,NE Jiangxi belong to sub-alkaline series.On the one hand,they have some similar geochemical characteristics such as high eNd(t)values.However,different samples show distinctive differences in certain other features.Some samples display characteristics of arc volcanic rocks,while others of within-plate basalts and tectonic discrimination.According to the analyses of major elements,trace elements,REE and Sm-Nd isotopic data,this paper gives some implications for petrogenesis,the geochemical properties of original magma,magma evolution,and the tectonic environment of these mafic-ultramafic rocks.

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What this paper is about

Mafic-ultramafic rocks dated at ～838 Ma in the Dexing area,NE Jiangxi belong to sub-alkaline series.On the one hand,they have some similar geochemical characteristics such as high eNd(t)values.However,different samples show distinctive differences in certain other features.Some samples display characteristics of arc volcanic rocks,while others of within-plate basalts and tectonic discrimination.According to the analyses of major elements,trace elements,REE and Sm-Nd isotopic data,this paper gives some implications for petrogenesis,the geochemical properties of original magma,magma evolution,and the tectonic environment of these mafic-ultramafic rocks.

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Available abstract

Mafic-ultramafic rocks dated at ～838 Ma in the Dexing area,NE Jiangxi belong to sub-alkaline series.On the one hand,they have some similar geochemical characteristics such as high eNd(t)values.However,different samples show distinctive differences in certain other features.Some samples display characteristics of arc volcanic rocks,while others of within-plate basalts and tectonic discrimination.According to the analyses of major elements,trace elements,REE and Sm-Nd isotopic data,this paper gives some implications for petrogenesis,the geochemical properties of original magma,magma evolution,and the tectonic environment of these mafic-ultramafic rocks.

Key concepts: Mafic, Ultramafic rock, Petrogenesis, Geology, Geochemistry, Magma, Volcanic rock, Basalt

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GEOCHEMISTRY AND GEOLOGICAL IMPLICATIONS OF MAFIC-ULTRAMAFIC ROCKS AS OLD AS ～838 Ma IN THE DEXING AREA,NE JIANGXI — Research Paper | ScholarLens