安徽长龙山矽卡岩浆型铁矿床成因探讨

AN INVESTIGATION INTO THE GENESIS OF THE CHANG- LONGSHAN SKARN-MAGMA TYPE OF IRON DEPOSIT, ANHUI PROVINCE

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.