| 黄骅盆地中新生代火山岩岩相及岩石化学特征 |
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| 关键词:Mesozoic-Cenozoic volcanic rocks petrochemistry Huanghua Basin |
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| 摘要: |
| Petrographic and Petrochemical Characteristics of the Mesozoic-Cenozoic Volcanic Rocks in Huanghua Basin |
| Based on data collected from typical boreholes and petrographic and petrochemical characteristics,combined with K Ar dating, trace element geochemistry and isotopic composition of the Mesozoic Cenozoic volcanic rocks in Huanghua basin of Bohai region, this paper has discussed geochemical features of these volcanic rocks.The rocks fall into four groups, namely Cenozoic basalt ,Late Cretaceous basaltic trachyandesite, Late Creatceous trachydacite and liparite, and Early Triassic dacite. The distribution of the abundances of major elements in Late Mesozoic shows a typical bimodal pattern.With the evolution of the volcanic rocks, the amount of SiO2 decreased gradually, whereas the content of Fe2O3, FeO, CaO, MgO, TiO2, P2O5 and MnO increases step by step. The Cenozoic basalt was derived from the asthenospheric mantle. The Late Cretaceous basaltic trachyandesite was derived from the enriched lithospheric mantle. In Late Cretaceous and Early Palaeogene, the felsic volcanic rocks might have been derived from fractional melting of the crust. |
| GU Li,DAI Ta-gen,FAN Wei-ming.2000.Petrographic and Petrochemical Characteristics of the Mesozoic-Cenozoic Volcanic Rocks in Huanghua Basin[J].Acta Geoscientica Sinica,21(4):365-372. |
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