李延平,林振宏,郑建斌,伊三泉,滕玉红,王岫岩
LI Yan-ping~(1; 2); LIN Zhen-hong~1; ZHENG Jian-bin~1;YI San-quan~2;TENG Yu-hong~2;

• 1:中国海洋大学海洋地球科学学院
• 2:中国海洋大学海洋地球科学学院
• 3:中国海洋大学海洋地球科学学院
• 4:大庆石油学院秦皇岛分院

摘要(Abstract)：

西藏羌塘盆地双湖地区阿木岗燕山早期花岗岩体出露于羌塘盆地中央隆起带之东段。根据岩石地球化学特征及构造环境判别图研究认为, 阿木岗岩体多数为SP强过铝质岩石类型, 地球化学显示具S型花岗岩的特征, 微量及稀土元素可与西藏Gabug同碰撞的花岗岩相类比, 形成于同碰撞构造环境; 少数为ACGI型花岗岩, 指示为大陆弧或岛弧的构造环境。考虑到岩体形成于中央隆起带主碰撞缝合、褶皱、变形和高压变质高峰期事件之后, 以及ACGI型花岗岩可与SP花岗岩形成于同一构造环境———后碰撞构造环境等特点, 认为阿木岗燕山早期花岗岩体形成于后碰撞构造环境。
Amugang early Yanshan granitoid in Shuanghu area of Tibet Qiangtang basin crop out in the eastern central uplift zone of Qiangtang basin. On the basis of geochemical characteristics and tectonic setting discrimination diagrams,Amugang early Yanshan granitoid are described as strongly peraluminous (SP) granite with S type in large volumes and ACGI type in small volumes;the former granite are similar to Tibet Gabug ones in trace element and REE formed in tectonic setting of syn-collision;the later granite is generated in tectonic setting of CAG and IAG.But on account of these granitoid all formed after the climax of main collision suture,folding,deforming and high-pressure regional metamorphic event,ACGI type granite associated with SP granite might generated in the same tectonic setting-post-collision,Amugang early Yanshan granitoid is thought to be formed in tectonic setting of post-collision.

关键词(KeyWords)： 燕山早期花岗岩;地球化学;后碰撞构造环境;阿木岗;藏北
early Yanshan granitoid;geochemistry;post-collision structural setting;Amugang;North Tibet

Abstract:

Keywords:

基金项目(Foundation):

作者(Authors): 李延平,林振宏,郑建斌,伊三泉,滕玉红,王岫岩
LI Yan-ping~(1; 2); LIN Zhen-hong~1; ZHENG Jian-bin~1;YI San-quan~2;TENG Yu-hong~2;

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