摘要
对桐柏北部加里东期桃园岩体和黄岗杂岩体的地球化学研究表明 ,桃园岩体形成于与洋壳消减作用有关的弧后盆地环境 ,与二郎坪基性火山岩具有相同的岩浆来源 .黄岗杂岩岩浆中含有一定比例的陆壳物质 ,该物质来自俯冲板片上陆壳沉积物的再循环 ,与二郎坪弧后盆地向北的俯冲消减有密切联系 .
Major and trace element compositions and isotopic compositions for Taoyuan intrusion and Huanggang intrusive complex are presented in this paper. The geochemical research into the Taoyuan intrusion and Huanggang intrusive complex in the Caledonian stage, north of Tongbai shows that the Taoyuan granitic magma derived from the depleted mantle are similar to the Erlangping basic volcanic magma. The Taoyuan granites that occurred in the back-arc basin related to the subdcution of the ocean plate originated from the same magma as those of Erlangping basic volcanic rocks. The Huanggang intrusive complex, closely related to the northward subduction of the Erlangping back-arc basin, was formed in the island-arc tectonic environment. The magmas of Huanggang are mixed with a certain percentage of continental crustal substances, products of the partial melting of the mantle wedge enhanced by the fluid extracted from the subducted slab and the overlying crustal substance in the subduction process.
出处
《地球科学（中国地质大学学报）》
EI
CAS
CSCD
北大核心
2001年第1期18-24,共7页
Earth Science-Journal of China University of Geosciences
基金
国家自然科学基金项目! (No .40 0 730 0 5 )
国家重点基础研究项目! (No .G19990 75 5 0 6 )
国土资源部壳幔体系组成
物质交换
关键词
弧后盆地
陆壳物质再循环
地球化学
俯冲消减作
back-arc basin subduction
recycling of crustal substance
Taoyuan intrusion
Huanggang intrusive complex
geochemisty
northern Qinling.
