| Carboniferous Bimodal Volcanic Rocks and Their Plate Tectonic Setting,Hainan Island |
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| 作者姓名： | 夏邦栋 施光宇 |
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| 作者单位： | [1]DepartmentofEarthSciences,NanjingUniversity,Nanjing210008 [2]DepartmentofGeography,ShanghaiNormalUniversity,Shanghai200234 |
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| 摘 要： | The Carboniferous volcanic rocks in western Hainan Island consist of a series of oceanic tholeite and rhyoporphyrite,showing bimodal nature.Similar geochemical characters,in terms of abun-daces and relative rations of incompatible elements and REE and the REE patterns,between the basalt and continental rift-associated tholeiite indicate the occurrence of Late Paleozoic rifting in the area.The basaltic magma,with a low degree of evolution,was originated from deep mantle,show-ing contamination by low crustal material.The rhyolite is thought to be formed from partial melting of the continental crust by higher thermal flow in a rift environment rather than from fractional crystallization of a basaltic magma.
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| 关 键 词： | 火山岩 地质构造 海南岛 石炭纪 地球化学特征 |
Carboniferous bimodal volcanic rocks and their plate tectonic setting,Hainan Island |
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| Bangdong Xia,Jinhai Yu,Zhong Fang,Ciyin Wang,Guangyu Shi.Carboniferous Bimodal Volcanic Rocks and Their Plate Tectonic Setting,Hainan Island[J].Chinese Journal of Geochemistry,1992,11(1):70-79. |
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| Authors: | Bangdong Xia Jinhai Yu Zhong Fang Ciyin Wang Guangyu Shi |
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| Institution: | (1) Department of Earth Sciences, Nanjing University, 210008 Nanjing;(2) Department of Geography, Shanghai Normal University, 200234 Shanghai |
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| Abstract: | The Carboniferous volcanic rocks in western Hainan Island consist of a series of oceanic tholeiite and rhyoporphyrite, showing
bimodal nature. Similar geochemical characters, in terms of abundances and relative ratios of incompatible elements and REE
and the REE patterns, between the basalt and continental rift-associated tholeiite indicate the occurrence of Late Paleozoic
rifting in the area. The basaltic magma, with a low degree of evolution, was originated from deep mantle, showing contamination
by low crustal material. The rhyolite is thought to be formed from partial melting of the continental crust caused by higher
thermal flow in a rift environment rather than from fractional crystallization of a basaltic magma.
This project was financially supported by the National Natural Science Foundation of China. |
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