| 东秦岭火山岩的壳幔热动力状态及造山模式 |
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| 引用本文： | 何瑞芳,段联合.东秦岭火山岩的壳幔热动力状态及造山模式[J].地球科学与环境学报,1993(3). |
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| 作者姓名： | 何瑞芳 段联合 |
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| 作者单位： | 西安地质学院 710054
(何瑞芳)，西安地质学院 710054(段联合) |
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| 摘 要： | 根据火山岩、沉积岩、变质作用与花岗岩成岩和形成环境的综合研究,本文确认熊耳群玄武粗安岩-英安流纹岩组合、大红口组粗面岩组合具低级壳幔热动力状态,形成于大陆裂谷环境;秦岭群、宽坪群变拉斑玄武岩建造具中级壳幔热动力状态,形成于海槽环境;二郎坪群、丹凤群细碧岩-石英角斑岩建造发育于高级壳幔热动力状态的海盆环境,具有下地幔岩石圈拆离导致的A型俯冲造山模式。
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| 关 键 词： | 壳幔热动力状态 构造环境 地幔岩石圈俯冲 东秦岭 |
CRUST-MANTLE THERMODYNAMIC STATES AND ORIGENIC MODELS OF VOLCANIC ROCKS IN THE EAST QINLING |
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| He Ruifang Duan Lianhe.CRUST-MANTLE THERMODYNAMIC STATES AND ORIGENIC MODELS OF VOLCANIC ROCKS IN THE EAST QINLING[J].Journal of Earth Sciences and Environment,1993(3). |
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| Authors: | He Ruifang Duan Lianhe |
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| Institution: | Xi' an College of Geology |
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| Abstract: | Based on the multidisciplinary genesis studies of volcanics, sedimentary rocks, granites and metamor-phism, it can be concluded that the bimodal basaltic trachyandesite-rhyodacite association of the Xionger group and the trachyte association of Dahongkou Formation developed in the continental rifts of the low grade crust-mantle thermodynamic state, and that the metatholeiite formations of the Qinling gronp and Kuanping group belong to the sea trough tectonic settings of the medium grade crust-mantle thermodynamic state. It also can be believed that the spilite-quartz-keratophtre formations of the Erlangping group and the Danfeng group developed in the sea basin tectonic settings of the high grade crustmantle thermodynamic environment with an origenic model of a northward type A subduction of delamination which was led by the sinking of the dense subcrustal mantle lithosphere. |
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| Keywords: | Crust-mantle thermodynamic states Volcanic tec-tonic setting Subcrustal lithosphere subduc-tion The Eastern Qinling Mountains |
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