【摘要】 长龙山铁矿床矿石以发育条带状构造为特点,组成条带状矿石的矿物主要为镜铁矿和方解石。研究表明,条带状方解石在微量元素,稳定同位素及流体包裹体特征等方面明显有别于围岩碳酸盐岩地层。条带状矿石的形成方式可能系成矿流体沸腾作用的结果。更多还原

【Abstract】 The iron ore of Changlongshan deposit is characterized by band structure in which specularite andcalcite alignate perallely alternatively. Bands are not uniform in distribution and occurrence. Ore tex-ture shows that calcite is in the interstitals of speclarite. Therefore, calcite is later than specularite. Calcite in banded ore is obviously different ftom carbonate country rock on the compositions ofchemical components, trace elements, carbon and oxygen stable isotopes. The fluid inclusions found in the banded calcite are gasliquid inclusion and polyphased inclusionwith daughter mineral, homhgeneous temperature of 239--303℃, salinity of 17.8--36.1Wt% equiv-alent to NaCl, density of 0.866--1.08g.cm~3. Based on the above features, it can be pointed out that the banded iron ore is likely formed byboiling process (even including partinl immiscibility) during the migration and locatoin of mineralizingfluid through layer slip fracture.更多还原