摘要
本文根据系统的Pb-Nd-Sr多元同位素体系研究表明,粤东地区中生代花岗质火山—侵入杂岩成岩作用机制为壳源岩石的部分熔融作用。源岩为未出露的古老陆壳基底岩石,源岩物质组成不均一,为先存幔源火山岩和地壳沉积物的混合物或互层。
Eastern Guangdong Province is located at the southeast end of the NE volcanic belt of the coast of southeastern China. The Mesozoic volcanic—intrusive complexes crop out widely over the district. Based on studies of Pb-Nd-Sr multi-element isotopic systems,it is held in this paper that the rock-forming machenism on the granitic volcanic—intrusive complexes is anatexite (equilibrium partial melting) of the continental crust. The source rocks of the complexes are old basement rocks cropping out in the neighbouring eastern Fujian and Zhejiang, but in this region. The composition of the source rocks is not homogeneous, and is the mixed materials or interclay of crustal sediments and mantle volcanic rocks in the crust.
出处
《地质论评》
CAS
CSCD
北大核心
1999年第S1期829-835,共7页
Geological Review
基金
国家教委博士点基金(编号930709)资助成果
关键词
火山—侵入杂岩
Pb-Nd-Sr同位素
岩浆作用
物质来源
粤东
granitic volcanic—intrusive complexes
Pb-Nd-Sr multi-element isotopic system
magmatism
source material
eastern Guangdong