Study on lithogeochemistry of Middle Jurassic basalts from southern China represented by the Fankeng basalts from Yongding of Fujian Province
作者： Jincheng Zhou , Shaoyong Jiang , Xiaolei Wang , Jinghong Yang , Mengqun Zhang
DOI: 10.1007/S11430-006-1020-2
关键词:
摘要: There exists an E-W trending Middle Jurassic volcanic zone in southern China. The Fankeng basalts the Yongding basin of Fujian Province are considered to be a typical example. have TiO 2 contents range 1.92%－3.21%. They classified as high-Ti basalts. also higher total Fe (averaging FeO * = 11.09%). from southwestern obvious distinctive lithogeochemical features early Cretaceous southeastern coast HFSE, such Th, Nb, Ta, Zr and Ti. Their element ratios related with Zr/Ba, La/Nb, La/Ta ,Zr/Y, Ti/Y, Ba/Nb, K/Ti Rb/Zr similar those OIB. most samples e Nd( T ) -0.70－0.24, which near chondrite. Some 1.87－3.55.Therefore, these basaltic magmas might derived depleted asthenospheric mantle. characteristics may caused by interaction between asthenosphere lithosphere at time. (Early-) gabbros Hunan, Jiangxi northern Guangdong provinces show geochemical Fujian. Occurrence OIB-type area regarded petrological mark upwelling Upwelling has led tectonic extension formation rifted area.
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