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《Geochimica》 1993-04
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THE MINEROGENESIS OF SHILU IRON ORES WITH SPECIAL REFERENCE TO Sm-Nd ISOTOPE GEOCHEMICAL CHARACTERISTICS OF SHILU-GROUP BIMODAL VOLCANIC ROCKS IN HAINAN ISLAND

Fang Zhong Xu Shijin Chen Kerong Xia Bangdong (Department of Earth Sciences,Nanjing University,Naniing,210008)Zhao Jianxin M.T.McCulloch (Research School of Earth Sciences,Australian National University,Canberra ACT 2601,Australia)  
Presented in this paper are Sm-Nd isotope and major,trace and rareearth ele-ment analyses of bimodal volcanic rocks of the Shilu Group and other stratigraphicuanits in northwestern Hainan Island,South China.It is shown that there are someN-MORB-type basalts(spilites)in the western part of the bimodal volcanic belt,inaddition to some E-MORB-type and Initial Rift-type tholeiites in the middle andeastern parts.Sm-Nd model ages of these basalts range from 545 to 460 Ma.Theother extremes of the bimodal volcanics are porphyritic quartz rhyolites,which arecharacteristic of crustal material source.Sm-Nd model ages of the rhyolites rangefrom 1562 to 1371 Ma.The bimodal volcanic rocks are almost distributed in riftsor faulted depressions,as well as in the Upper Palaeozoic rift of Hainan Island.Tholeiites of the Shilu Group can be compared with Cenozoic basalts in the mi-ddle and southern parts of the Red Sea Rift Belt in petrology,elemental geochemi-stry and Sm-Nd isotope geology.Shilu iron ores are closely associated with N-MORB-type basalts located in the western bimodal volcanic belt.It is very interestingto note that the Shilu Fe-Co-Cu deposit can also be compared with Atlantis Ⅱ Deepin the Red Sea Rift Belt.Therefore,the present authors believe that the Shilu de-posit is a kind of hydrothermal deposit related to ocean volcanic belt,where thegeotectonic setting belongs to initial extensional rifts in the oceanic crust.On theother hand,the largest Fe-Co-Cu ore deposit in China used to be influenced byHercynian granites after mineralization,as is clearly observed on both ε Nd(T)-1/Nd and ε Nd(T)-~(147)TSm/~(144)Nd diagrams.
【Fund】: 国家自然科学基金;; 澳大利亚国立大学地球科学研究院资助
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