Discussion on Geochemistry and Formation of Intermediate Volcanics of Dahalajunshan Group in Southeast Tekesi County Area, West Tianshan Mountains

详细信息   

• 责任者：Chen Yaoyu (Third Institute of Geology and Mineral Prospecting ; Bureau of Geology and Mineral Resources of Gansu Province ; Lanzhou 730050 ; China) ; Dai Wenjun
• 刊名：Journal of Mineralogy and Petrology
• 出版年：2012
• 卷期：32(2)
• 关键词：火山岩 ; volcanic rocks ; 天山 ; Tianshan Mountains
• 页码：p.56-62
• 图表：3 illus., 2 tables, 23 refs.
• 分类号：0801
• issnNo：ISSN1001-6872
• isbnNo：CN51-1143/TD

摘要

The intermediate volcanic rocks of Dahalajunshan Group in southeast Tekesi County area, west Tianshan Mountains, are calc-alkaline volcanic rocks, most of them are basaltic andesite, andesite, with minor trachyandesite. These rocks are high in silicon and sodium, low in titanium and potassium. Geochemical characteristics show that the magmatic source is of enriched mantle magma source,which was resulted from by crust contamination and metasomatic process by fluid or melted materials from subduction residual plate.