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《Earth Science》 2018-07
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Petrogenesis and Implications of the Haiyan A-Type Granites and Mafic Microgranule Enclaves in Southern Guangdong Province

Jia Xiaohui;Xie Guogang;Meng Delei;Wan Le;Wu Jun;Bu Jianjun;Wu Fuqiang;Zeng Hailiang;Lu Jiawen;Zhan Ruihua;Wuhan Center of China Geological Survey;Research Center for Petrogenesis and Mineralization of Granitoid Rocks,China Geological Survey;No.912 Geological Surveying Party,Jiangxi Bureau of Geology and Mineral Exploration and Development;  
The study of the late Mesozoic granites in South China and its tectonic setting is a hotspot issue.In this paper,new zircon U-Pb ages and geochemical data of the Haiyan A-type granites and mafic microgranule enclaves(MMEs)in southern Guangdong are reported,and the petrogenesis and implications of these rocks are discussed.We present new zircon LA-ICP-MS U-Pb ages of the Haiyan granites and its MMEs,and the results of the age analyzing show that the granites and MMEs were generated in Early Cretaceous(144.0±1.7 Ma and 141.1±2.5 Ma,respectively).The Haiyan granites have the typical features of A-type granites,they are characterized by enrichment in silicon,alkali and iron contents,and depletion in magnesium and calcium contents,with high 10 000×Ga/A1 values and Zr+Nb+Ce+Y components.Small amounts of MMEs occur in the Haiyan granites,and they are characterized by enrichment in alkali and more enrichment in potassium contents,high aluminum and low titanium,strong enrichment in the large ion lithophile elements and light rare earth elements,belonging to shoshoniticrocks.Granites have ISrvalues of 0.706 6-0.712 2,ε_(Nd)(t)values of-7.01--2.03.While MMES have relatively lower I_(Sr) values(0.708 5-0.711 1)and higherε_(Nd)(t)values(-6.99--2.23).Combining with geochemical and Sr-Nd isotopic compositions,we suggest that the Haiyan granites were likely generated by partial melting of the Mesoproterozoic crustal rocks,and the primitive compositions of shoshonitic MMEs likely originated from enriched mantle source somatized by subducted oceanic sediments.The findings of the Haiyan A-type granites and shoshonitic mafic enclaves suggest that the regional tectonic setting during the Early Cretaceous was in extension,and different from southeast coastal areas with compressive tectonic regime.
【Fund】: 中国地质调查局项目(No.DD20160064-01);; 国家自然科学基金项目(No.41302046)
【CateGory Index】: P534.4;P588.121
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