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Geochemistry of Mesoproterozoic Volcanic Rocks in the Western Kunlun Mountains: Evidence for Plate Tectonic Evolution

查看全文 作　　者：[1]ZHANGChuanlin;[2]DONGYongguan;[2]ZHAOYu;[2]WANGAiguo;[2]GUOKunyi 高影响力作者 机构地区：[1]GuiyangInstituteofGeochemistry,ChineseAcademyofSciences,Guiyang,Guizhou550002;[2]NanjingInstituteofGeologyandMineralResources,Nanjing,Jiangsu210016高影响力机构 出　　处：《Acta Geologica Sinica(English Edition)》索引2003年第77卷第2期,共9页高影响力期刊 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 exploring the position of the Paleo-Tarim plate in the Rodinia super-continent. 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
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