| 黄骅盆地中新生代火山岩岩相及岩石化学特征 |
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| 引用本文：谷俐,戴塔根,范蔚茗.2000.黄骅盆地中新生代火山岩岩相及岩石化学特征[J].地球学报,21(4):365-372. |
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| 全文下载次数: 1970 |
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| 中文摘要:通过对渤海地区黄骅盆地中新生代火山岩进行典型的岩芯取样、岩相及全岩分析，并结合KAr法测年、微量元素和同位素地球化学分析，得出以下结论:主要岩石类型有新生代老第三纪玄武岩、中生代晚白垩世玄武粗安岩、中生代晚白垩世粗面英安岩和流纹岩和中生代早三叠世英安岩。晚中生代火山岩岩石的主量元素丰度呈双峰分布，从老到新，火山岩主元素中SiO2减少，Fe2O3、FeO、CaO、MgO、TiO2、P2O5、MnO有所增加。新生代玄武岩可能源自亏损的软流圈地幔，晚白垩世玄武粗安岩源自玄武质组分亏损和受到富集改造的岩石圈地幔，晚白垩世及早三叠世长英质火山岩可能源自地壳组分的部分熔融。 |
| 中文关键词:中新生代 火山岩 岩石化学 黄骅盆地 |
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| Petrographic and Petrochemical Characteristics of the Mesozoic-Cenozoic Volcanic Rocks in Huanghua Basin |
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| Abstract: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. |
| keywords:Mesozoic-Cenozoic volcanic rocks petrochemistry Huanghua Basin |
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