Petrochemical Characteristics of the Mesozoic-Cenozoic Volcanic Rock in Huanghua Basin

来源期刊：中南大学学报(英文版)2000年第2期

论文作者：GU Li DAI Ta-gen DENG Cai-hua FAN Wei-ming

文章页码：75 - 80

Key words：Mesozoic-Cenozoic era; volcanism; petrochemistry; Huanghua basin

Abstract: Based on the data from typical core sampling, combined with K-Ar dating, petrochemistry,trace elemental geochemistry and isotopic compositions of the Mesozoic-Cenozoic volcanic rock in the Huanghua basin, Bohai region, the geochemical features of the volcanic rock were studied. The rocks fall into four groups: Cenozoic basalt, Mesozoic late Cretaceous basaltic-trachyandesite, Mesozoic late Cretaceous trachy-dacite and liparite, and Mesozoic early Triassic dacite. The distribution pattern of the main elemental abundance of late Mesozoic shows a typical bimodal.Chronologically, for the volcanic rock, the amount of SiO₂ decreases gradually, the contents of Fe₂O₃,FeO,CaO,MgO,TiO₂,P₂O₅ and MnO increase little by little. The Cenozoic basalt is derived from the asthenospheric mantle.The late Cretaceous basaltic-trachy-andesite is derived fromthe enriched lithospheric mantle.In late Cretaceous and early Palaeogene,the felsic volcanic rock may be derived from fractional melting of the crust.