摘要
银山地区火山岩－次火山岩由流纹岩、流纹英安斑岩、英安质熔岩、英安斑岩和粗面安山斑岩组成，喷发和侵入存在着反序特征．通过各种物理化学方法确定了岩浆房中存在的化学成分和温度、密度、粘度梯度．建立了以英安质岩浆为主，顶部有一层富ＳｉＯ２、富Ｋ的流纹质岩浆，底部为少量粗面安山质岩浆的带状岩浆房．岩浆演化及带状岩浆房的形成是分离结晶、同化混染、岩浆对流和边界层机制共同作用的结果．
The volcanic-subvolcanic rocks in Yinshan ore area are composed of rhyolite, rhyodacite porphyry, dacitic lava, dacite porphyry and latite porphyry. Their eruption and intrusion show obvious reversed order. Grandients of chemical compositions, temperature, density and viscosity in the chamber have been defined by some physicochemical methods. The zonal magma chamber is dominated by dacitic magma with a layer of rhyolitic magma rich in SiO 2 and K on the top, and a little latitic magma in the bottom. The magma evolution and the genetic mechanism of the zonal magma chamber are restrained by fractional crystallization, assimilation, magma convection and boundary layer mechanism.
出处
《地球科学（中国地质大学学报）》
EI
CAS
CSCD
北大核心
1998年第3期257-261,共5页
Earth Science-Journal of China University of Geosciences
基金
地质矿产部定向基金
关键词
火山岩-次火山岩
岩浆演化
带状岩浆房
银山
德兴
volcanic_subvolcanic rock, magma evolution, zonal magma chamber, Yinshan, Dexing.
