摘要
长龙山铁矿为一中型矽卡岩铁矿床,其矽卡岩一般呈似层状,与围岩碳酸盐岩接触界线清楚截然,并发育气孔构造和似伟晶岩囊。矽卡岩矿物中见有熔融包裹体和熔-流包裹体,表明矽卡岩成岩流体为岩浆熔融体。形成于矽卡岩之后的铁矿体,除矿体与围岩界线清楚外,还发育流动作用形成的条带状构造。地质及矿物中包裹体和稳定同位素研究显示成矿流体可能为富含挥发组分的铁矿浆,而深部岩浆房内的熔离作用则是产生矽卡岩浆和铁矿浆的主要机制。
The Changlongshan iron deposit is a skarn one in moderate scale. Its skarn generally occurs in the quasi-layered form, and the boundary with wall rocks (carbonate) is sharply conspicuous. At the skarn time, the vesicular structure and quasi-pegmatitic pockets develop, and there are melting and melting-fluid inclusions in the skarn. These suggest that the skarn-forming fluid is melting magma.In addition to the clear outline, iron orebody following the skarn has developed the banded structure caused by the flowing of ore magma. It can be thought that the ore-form-ing fluid possibly is the volatile-rich iron ore magma, and the immiscibility in the deep magmatic chamber is the formation mechanism of skarn magma and ore magma through the studies of geological features as well as some kinds of the testing data in laboratories.
出处
《地球科学（中国地质大学学报）》
EI
CAS
CSCD
北大核心
1990年第6期649-656,共8页
Earth Science-Journal of China University of Geosciences
关键词
铁矿
矿床
成因
矽卡岩
岩浆
安徽
skarn magma, iron ore magma, liquid immiscibility, genesis of mineral deposit, Anhui Province,
