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| 柴达木盆地北缘西端冷湖花岗岩 | |
| 引用本文： | 吴才来 杨经绥 王志红 乔德武 李海兵 史仁灯. 柴达木盆地北缘西端冷湖花岗岩[J]. 地质通报, 2001, 20(1): 73-81 |
| 作者姓名： | 吴才来 杨经绥 王志红 乔德武 李海兵 史仁灯 |
| 作者单位： | 1. 中国地质科学院地质研究所 2. 西安工程学院 3. 中国地质科学院地质力学研究所 |
| 基金项目： | 国家自然科学基金项目（49772106、49732070）和原地矿部“九五”重点基础项目（9501106）以及国家305项目06－04专题资助。 |
| 摘 要： | 冷湖花岗岩体由花岗闪长岩和二长花岗岩组成，岩体中发育较多的辉绿岩墙和花岗闪长斑岩岩墙。岩石的常量、稀土、微量元素地球化学研究表明花岗岩类和脉岩类为同源岩浆分异演化而成，Rb-Sr、Sm-Nd同位素特征反映其源岩来自地幔。地球化学判别图解得出，冷湖花岗岩类属I型花岗岩，早期的花岗闪长岩形成于岛弧环境，与柴达木板块、南祁连板块的碰撞有关；晚期的二长花岗岩形成于板块碰撞隆起环境，与阿尔金大型走滑断裂的活动有关。 |
| 关 键 词： | 花岗岩类；脉岩类；地球化学；构造环境；青海冷湖 |
| 文章编号： | 1000－3967（2001）01－0073－09 |
| 修稿时间： | 1999-10-20 |
The Lenghu granitoids at the western endof the northern margin of the Qaidam basin， Qinghai |
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| WU Cai-lai,YANG Jing-sui,WANG Zhi-hong,QIAO De-wu,LI Hai-Bing,SHI Ren-deng. The Lenghu granitoids at the western endof the northern margin of the Qaidam basin， Qinghai[J]. Geologcal Bulletin of China, 2001, 20(1): 73-81 | |
| Authors: | WU Cai-lai YANG Jing-sui WANG Zhi-hong QIAO De-wu LI Hai-Bing SHI Ren-deng |
| Abstract: | The Lenghu granitoids consist of granodiorite and monzonitic granite． There exist many diabase and granodioritic porphyry dikes in the intrusion． Major and minor element， REE and trace element geochemistry of the rocks show that the granitoids and dike rocks originated by differentiation of cogenetic magma． Rb-Sr and Sm-Nd isotope data indicate that they were derived from the mantle． Trace element discrimination diagrams show the following： the Lenghu granitoids belong to I-type granites； the early-stage granodiorite intruded in an island-arc environment and was related to the collision of the Qaidam plate and South Qilian plate， while the late-stage monzonitic granite formed in a plate collision and uplift environment and was related to the activity of the Altun strike-slip fault． |
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