| Geochemistry of Mesoproterozoic Volcanic Rocks in the Western Kunlun Mountains: Evidence for Plate Tectonic Evolution |
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| 作者姓名： | ZHANG Chuanlin DONG Yongguan ZHAO Yu WANG Aiguo and GUO Kunyi Guiyang Institute of Geochemistry Chinese Academy of Sciences Guiyang Guizhou E-mail: zchuanlin@sina.com Nanjing Institute of Geology and Mineral Resources Nanjing Jiangsu |
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| 作者单位： | ZHANG Chuanlin，DONG Yongguan，ZHAO Yu，WANG Aiguo and GUO Kunyi Guiyang Institute of Geochemistry，Chinese Academy of Sciences，Guiyang，Guizhou 550002;E-mail: zchuanlin@sina.com Nanjing Institute of Geology and Mineral Resources，Nanjing，Jiangsu 210016 |
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| 摘 要： | Mesoproterozoic volcanic rocks occurring in the north of the western Kunlun Mountains can be divided into two groups. The first group (north belt) is an reversely-evolved bimodal series. Petrochemistry shows that the alkalinity of the rocks decreases from early to late: alkaline→calc-alkaline→tholeiite, and geochemistry proves that the volcanic rocks were formed in rifting tectonic systems. The sedimentary facies shows characteristics of back-arc basins. The second (south belt) group, which occurs to the south of Yutian-Minfeng-Cele, is composed of calc-alkaline island arc (basaltic) andesite and minor rhyolite. The space distribution, age and geochemistry of the two volcanite groups indicate that they were formed in a back-arc basin (the first group) and an island arc (the second group) respectively and indicate the plate evolution during the Mesoproterozoic. The orogeny took place at -1.05 Ga, which was coeval with the Grenville orogeny. This study has provided important geological data for explorin
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| 关 键 词： | 地球化学 中元古代 火山岩 昆仑山 格林维尔群 造山作用 板块构造 |
Geochemistry of Mesoproterozoic Volcanic Rocks in the Western Kunlun Mountains: Evidence for Plate Tectonic Evolution |
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| Authors: | ZHANG Chuanlin DONG Yongguan ZHAO Yu WANG Aiguo and GUO Kunyi Guiyang Institute of Geochemistry Chinese Academy of Sciences Guiyang Guizhou E-mail: zchuanlin@sinacom Nanjing Institute of Geology and Mineral Resources Nanjing Jiangsu |
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| Abstract: | Mesoproterozoic volcanic rocks occurring in the north of the western Kunlun Mountains can be divided into two groups. The first group (north belt) is an reversely-evolved bimodal series. Petrochemistry shows that the alkalinity of the rocks decreases from early to late: alkaline→calc-alkaline→tholeiite, and geochemistry proves that the volcanic rocks were formed in rifting tectonic systems. The sedimentary facies shows characteristics of back-arc basins. The second (south belt) group, which occurs to the south of Yutian-Minfeng-Cele, is composed of calc-alkaline island arc (basaltic) andesite and minor rhyolite. The space distribution, age and geochemistry of the two volcanite groups indicate that they were formed in a back-arc basin (the first group) and an island arc (the second group) respectively and indicate the plate evolution during the Mesoproterozoic. The orogeny took place at ～1.05 Ga, which was coeval with the Grenville orogeny. This study has provided important geological data for exploring the position of the Paleo-Tarim plate in the Rodinia super-continent. |
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| Keywords: | western Kunlun Mesoproterozoic volcanic rocks geochemistry Grenville orogeny |
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