柴北缘布衣坦乌拉山南东段桑格斯帕地区变质侵入体地质特征及成因探讨

Geological Characteristics and the Origin of Metamorphic Intrusion in Sangesipa Area in Southeastern Region of Buyitanwula Mountain in Northern Margin of Qaidam Basin

摘要:

变质侵入体主要分布于桑格斯帕地区，是从达肯大坂岩群中剔除的一套变质侵入体，和达肯大坂岩群一起构成欧龙布鲁克微陆块的变质基底。变质侵入体常量元素属高分异铝过饱和钾玄岩、高钾钙碱性系列岩浆岩；微量元素显示岩石具火山弧花岗岩特点；稀土元素总体显示轻稀土较为富集、重稀土相对亏损。变质侵入体属于古元古代晚期因不同块体碰撞形成的具有挤压环境特征的火山弧花岗岩。

Abstract:

Metamorphic intrusions are mainly distributed in Sangesipa area. It is a metamorphic intrusion that is disintegrated from Dakendaban group. Metamorphic intrusions and Dakendaban Group constitute the metamorphic basement of Oulongbruk mircoblock. The constant elements of metamorphic intrusions are highheterogeneous aluminosal supercritical kaolinitic rocks and highK calcalkaline series magmatic rocks. The trace elements show the characteristics of volcanic granites. The rare earth element shows that light rare earth element is more enriched, while the heavy rare earth element is relative loss. Metamorphic intrusions belong to volcanic arc granites with crushed environmental characteristics formed by the collision of different blocks in late Paleoproterozoic period.