摘 要:青藏高原西部燕山早期花岗岩分布于塔阿西-红山湖缝合带北侧的塔什库尔干-甜水海地体内,岩石组合为石英二长闪长岩“花肉闪长岩-二长花岗岩,岩石属高钾钙碱性系列,形成于活动陆缘环境。花岗岩及区域沉积建造特征表明,塔阿西-红山湖缝合带形成于燕山早期晚侏罗世。
关键词:燕山早期;花岗岩;地球化学;青藏高原西部
分类号:P595 文献标识码:A
文章编号:1001-6872(2000)01-0074-79 GEOCHEMISTRY OF EARLY YANSHANIAN GRANITOIDS AND ITS TECTONIC SIGNIFICANCE IN THE WESTERN QINGHAI-TIBET PLATEAU JIANG Yao-hui
(Nanjing Institute of Geology and Mineral Resources,Ministry of Land Resources,Nanjing 210016)
YANG Wan-zhi
(Xinjiang Geophysical and Geochemical exploration Team,Changji 831100) Abstract:Early Yanshanian granitoids in the western Qinghai-Tibet plateau are distributed in Taxkorgan—Tianshuihai terrane located to the north-side of Taaxi-Hongshanhu suture zone. The rock association is quartz monzodiorite-granodiorite-monzonitic granite. The rocks belong to K-rich calc-alkaline series and generated in the active continental margin environment. The charac-teristics of the granitoids and regional sedimental formation indicate that Taaxi-Hongshanhu su-ture formed in late Jurassic.
Keywords:early Yanshanian ;granite ;geochemistry ;western Qinghai-Tibet Plateau
基金项目:“九五”原地矿部资源与环境科技攻关项目(编号:9502010)
作者简介:姜耀辉 男 36岁 副研究员(博士) 矿物学、岩石学、矿床学专业 研究方向:岩浆岩石学
作者单位:姜耀辉(国土资源部南京地质矿产研究所,南京 210016)
杨万志(新疆物化探大队,昌吉 831100)
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