摘要
在浙江东北部大衢山花岗岩体的局部地段出现大量闪长岩类包体,其分布、形态、结构和构造特点表明,该类包体是由成分和温度不同的两种岩浆,即寄主岩浆与包体岩浆经机械混合和包体岩浆的淬冷结晶的产物——淬冷包体。依据Campbell et al.(1986)的岩浆动力学模拟实验,混合的模型是岩浆喷泉作用。上述岩石包体与寄主岩相比,相对地富Zr,P,Ti和REE等高场强元素,这说明发生混合的、成分不同的两岩浆很可能是同源的,由液相不混溶作用产生。
A large number of dioritic enclaves are distributed only in a restricted part of the Dajushan biotite-adamellite pluton, East Zhejiang. The characteristics of their distribution, shape, structure and texture show that they are quenched enclaves and are the products of the mechanical mixing of two magmas of different composition at different temperatures. It is believed that the simulation experiments of magma fountain by Campbell et el. can be used to explain the formation of this kind of enclaves. The fact that the enclaves and the host rock are comagmatic and that the former is relatively rich in high-field-strength elements such as Zr, P, Ti, REE, etc. suggests that origin of the enclaves may be magma immiscibility between the two corresponding magmas.
出处
《岩石学报》
SCIE
EI
CAS
CSCD
北大核心
1992年第3期234-242,共9页
Acta Petrologica Sinica
基金
国家自然科学基金48970103号的部分研究成果
关键词
花岗岩
淬冷包体
成因机制
Quenched enclaves
Magma fountain
Magma immiscibility
