A STUDY OF PRE-CAMBRIAN BASEMENT IN THE QAIDAM BASIN
-
摘要: 重力、航磁、地震、遥感、地表地质等资料的研究结果表明,柴达木盆地基底存在着中央断裂带。中央断裂带将柴达木盆地基底分为南北性质截然不同的两部分,说明柴达木盆地存在吕梁期以前的古陆核。结合中酸性岩浆岩氧化物成分构造环境判别结果,进一步可以推断古阿尔金洋的存在,使古秦祁昆洋的范围扩大。阿尔金运动使阿尔金洋封闭,岛弧成陆,形成前寒武纪的褶皱镶嵌边。Abstract: Based on data of gravity survey, seismic exploration, aerial magnetical survey and surface geology, the central fault belt was identified in the Qaidam Basin. The basin was divided into two differnt parts by the fault and indicated existence of old crystaline continental kernel pre-Wutai movement. In accordance with geochemical data of intermediatoacid intrusives, a conclusion can be drawn that there was an old altyn Ocean, which expanded the scope of the paleo-Qing-Qi-Kun Ocean. The Altyn Ocean was closed during the Altgn Movement and the arc became pre-Cambrian folded accreted belts.
-
Key words:
- Qaidam Basin /
- central fault belt /
- Pre-Cambrian basement /
- the old Altyn Ocean /
- folded accreted belts
-
[1] 青海省地矿局.青海省区域地质志[M].北京:地质出版社,1991. [2] 青藏油气区石油地质志编写组.中国石油地质志(卷十四)[M].北京:石油工业出版社,1990. [3] 黄汉纯.柴达木盆地地质与油气预测[M].北京:地质出版社,1989. [4] 杨华.青藏高原东部航磁特性及其与构造成矿带的关系[M].北京:地质出版社,1991. [5] 黄杏珍,邵宠舜,顾树松,等.柴达木盆地的油气形成与寻找油气田方向[M].兰州:甘肃科学技术出版社,1993. [6] 《中国岩石圈动力学地图集》编委会.中国岩石圈动力学概论[M].北京:地震出版社,1991. [7] 韩宝福,何国琦,王式光.后碰撞幔源岩浆活动、底垫作用及准噶尔盆地基底的性质[J].中国科学(D辑),1999, 129(1): 16-21. [8] Pearce TH, et al. The relationship between major element chemistry and tectonic environment of basic and intermediate volcanic rocks[J]. Earth Planet Sci Lett,1997,36: 121-332. [9] Maniar PD, PiccoliPM. Tectonic discrimination of granitoids[J]. Geological Society of America Bulletin, 1989, 101: 635-643. [10] Condie K C. Contrasting sources for upper and lower continental crust: the greenstone connection[J], The Journal of Geo, 1997,105: 729-736. [11] Sugisako R. Chemical characterisics of volcanic rocks: relation to plate movements[J].Lithos,1976,9:17-30. [12] 陈能松.东昆仑造山带东段清水泉高级变质岩的变质岩石学研究[J].地球科学,1999,24(2):116-120. [13] 刘德良,沈修志,陈江峰,叶尚夫.地球与类地行星构造地质学[M].合肥:中国科技大学出版社,1997.80-117. -
计量
- 文章访问数: 642
- HTML全文浏览量: 60
- PDF下载量: 485
- 被引次数: 0
下载:
苏公网安备32021102000780号