Geochemical Features of Devonian Volcanic Rock in the Western Edge of Sub-North-Zone of Beishan in Gansu Province
详细信息
- 责任者：Dai Wenjun (No. 3 Geology and Mineral Exploration Team ; Gansu Provincial Bureau of Geology and Mineral Exploration and Development ; Lanzhou 730050 ; China) ; Liu Mingqiang
- 刊名：Gansu Geology
- 出版年：2008
- 卷期：17(3)
- 关键词：火山岩 ; volcanic rocks ; 甘肃 ; Gansu
- 页码：p.13-21
- 图表：7 illus., 3 tables, 25 refs.
- 分类号：0801
- issnNo：ISSN1004-4116
- isbnNo：CN 62-1191/P
摘要
Devonian volcanic rock situated in the edge of sub-north-zone of Beishan in Gansu Province is mainly composed of a suite of low metamorphic rocks of andesite, rhyolite, dacite, and a few of basalt in the local. The compositions of rocks meet the feature of sodium type of calc-alkaline series. It is the concentration of light rare earth elements with the total rare earth of 65. 48×10-6～196. 69×10-6, and Chondrite-normalized REE pattern incline to the right. The analyzing results of the features of petrology and geochemistry, and regional tectonic settings support that this suite of volcanic rock formed in the environment of active continental margin and island arc, and is the results of volcanism of subduction with the tectonic setting of subducted orogenic belt.