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《Geotectonica Et Metallogenia》 2008-02
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PETROGENESIS OF THE MESO-NEOPROTEROZOIC GRANITOIDS IN HAINAN ISLAND AND THEIR TECTONIC SIGNIFICANCE

XU Deming1,SANG Longkang2,MA Daquan1,XIE Caifu1, ZNANG Yeming1 and FU Taian1(1.Yichang Institute of Geology and Mineral Resources, Yichang 443003, Hubei, China; 2. Faculty of Earth Sciences, China Univesity of Geosciences, Wuhan 430074, Hubei, China)  
Geochemical and Sm-Nd isotopic data are reported for the Meso-Neoproterozoic (ca. 1000Ma) granitoids in Hainan Island. The Meso-Neoproterozoic granitoids in Hainan Island are calc-alkaline,characterized by enrichment in silicon (SiO2 contents are 67.78%~75.04%),being metaluminous or weakly peraluminous(A/CNK=0.96~1.08),lower Mg# values(0.24~0.44)and Cr (5.82~13.42μg/g) and Ni(2.74~7.23μg/g)contents,intensively depletion in Y(2.85~13.70μg/g)and HREE(Yb contents are 0.26~1.22μg/g),and with high Sr/Y(23.75~173.38)and La/Yb(32.11~88.12)values,which are similar to TTG or low-Mg adakites. Combined with their slighty positive εNd(t),the Meso-Neoproterozoic granitoids in Hainan Island might be generated by partial melting of underplated basaltic lower crust,with garnets and possible few amphiboles as residues in source region,and the source rocks are most likely the Paleo-Mesoproterozoic amphiboles with high K and low Cr and Ni contents. The Meso-Neoproterozoic granitoids in Hainan Island were generated in the late stage of the Grenvillian orogeny,and this result supports the idea that a coherent South China Craton was formed during the ca. 1000Ma.
【Fund】: 中国地质调查局国土资源大调查项目(200013000127)和(200113900018).
【CateGory Index】: P588.121
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