| 新疆额尔齐斯地区裂谷火山岩的初步研究 |
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| 引用本文： | 卫管一,倪志清.新疆额尔齐斯地区裂谷火山岩的初步研究[J].矿物岩石,1990,10(3):15-23. |
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| 作者姓名： | 卫管一 倪志清 |
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| 作者单位： | 成都地质学院，成都地质学院 成都 610059，成都 610059 |
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| 摘 要： | 新疆富蕴县西部上石炭统喀喇额尔齐斯组的变质火山岩,是一套多旋回双峰式古裂谷型火山岩.基性成员为玄武岩。酸性成员为流纹岩.基性岩套由拉斑玄武岩-碱性玄武岩组成.微量元素分配模式证明了地幔成分不均一性;玄武岩浆来自石榴二辉橄榄岩44％的分批熔融;证明古裂谷是在岛弧基础上演化形成。从而说明额尔齐斯断裂带经历了俯冲-碰撞-裂谷三个演化阶段.晚期的碱性玄武岩喷发,标志裂谷作用的消亡.
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| 关 键 词： | 火山岩 裂谷 新疆 额尔齐斯 玄武岩 |
PRELIMINARY STUDIES ON THE VOLCANIC ROCKS OF THE RIFT IN THE ERTIX REGION, XINJIANG |
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| Wei Guanyi Ni Zhiyao.PRELIMINARY STUDIES ON THE VOLCANIC ROCKS OF THE RIFT IN THE ERTIX REGION, XINJIANG[J].Journal of Mineralogy and Petrology,1990,10(3):15-23. |
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| Authors: | Wei Guanyi Ni Zhiyao |
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| Abstract: | Metamorphic volcanic rocks of Upper Carboniferous Karaertix Formation in the west of Fuyun County of Xinjiang is a suite of old-rift type volcanic rocks of the multicycle and bimodal type. The basic and acidic members are basalt and rhyolite respectively. Basic suite consists of tholeiite and alkali-basalt. Distribution model of frace elements testifles that the mantle composition is nonuniform, and the basaltic magma came from batch melting of 44% of garnet-lherzolite, as well as that old-rift evolved from the island are setting. Thus, Ertix rift zone underwent three cvolutional stages of downgoing-collision-rift. Eruption of the later alkali-basalt indicates thc subduction of rifting. |
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| Keywords: | Xinjiang Ertix rifting bimodal volcanic rocks basalt |
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