The Discovery of the Jurassic OIB-Type Rocks in the Bangong Lake-Nujiang River Suture Zone
详细信息
- 责任者：Basang Yuzhen (College of Earth Science ; Jilin University ; Changchun 130061 ; China) ; Li Cai
- 刊名：Geological Bulletin of China
- 出版年：2013
- 卷期：32(4)
- 关键词：洋岛玄武岩 ; ocean-island basalts ; 青藏高原 ; Qinghai-Tibetan Plateau
- 页码：p.563-566
- 图表：illus., 1 plate, 3 refs.
- 分类号：0801
- issnNo：ISSN1671-2552
- isbnNo：CN11-4648/P
摘要
Nadong oceanic island is located in the western part of the Bangong Lake-Nujiang River suture zone.It occurs as an EWtrending belt in parallel with ophiolite and is associated with the Jurassic Muga Kangri Group.There exists transitional contact relationship between the OIB-type basalts and the flysch of the Muga Kangri Group.The OIB-type rocks are composed of basalt,basaltic conglomerate,limestone and/or reef limestone.Furthermore,these rocks display several volcanic eruption cycles.Geochemical data show that all the basalts have typical OIB features.Studies have also shown that a Jurassic ocean basin existed in the Bangong LakeNujiang River suture zone.Thus the discovery of the Nadong oceanic island plays a key role in revealing the evolutionary history of the Bangong-Nujiang Ocean during the Jurassic.