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《GEOCHIMICA》 1997-02
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GEOCHRONOLOGY AND GEOCHEMISTRY OF CRETACEOUS MAFIC DIKES FROM NORTHERN GUANGDONG, SE CHINA

Li Xianhua ① Hu Ruizhong ② Rao Bing ③ (① Guangzhou Institute of Geochemistry, Chinese Academy of Sciences,Guangzhou 510640) (② Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002) (③ Department of Earth Sciences, Na  
Systematic radiometric, geochemical and Sr-Nd isotopic analyses are reported here for the Cretaceous mafic dikes from northern Guangdong, SE China in order to provide a better understanding of the origin of magma and its tectonic significance. The mafic dikes were emplaced in three principal episodes: at~140Ma, ~105Ma and ~90Ma. With the chemical characteristics of tholeiitic basalts, they were derived from a moderate time-integrated LREE depleted mantle source with ε Nd ( T) values of 5. The trace element chemistry of the dikes shows general similarities to within-plate basalts. However, some of the 140 Ma dike samples exhibit arc signitures with Th-enrichment and Zr-and Hf-depletion. Thus, these mafic dikes are interpreted as having been magmatism produced during a lithospheric extension from a mantle source influenced by earlier subduction processes. This mantle source shows an EMII signature in incompatible trace element ratios. The combined geochemical and geochronological constraints on the origin of the mafic dikes, together with results from previous studies of late Mesozoic granites, volcanic rocks and extensional (or rifted) basins indicated that SE China was dominated by an extensional tectonic regime during the Cretaceous, with four major episodes of extensional activities taking place at ~ 140Ma ,~124 Ma,~105 Ma and~90 Ma.
【Fund】: 国家自然科学基金
【CateGory Index】: P534.53
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