苏南锶矿成矿作用讨论

CHARACTERISTICS AND METALLOGENESIS OF STRONTIUM DEPOSIT IN THE MIDDLE AND LOWER YANGTZE REACA

近年来在长江中下游的溧水和宁芜火山岩盆地不断发现一些与火山碎屑岩有关的锶矿床和含锶重晶石,本文通过阐述这些矿床的地质特征,分析其成矿作用,为今后火山热液型锶矿的找矿工作提供理论依据。

In recent several years,some strontium deposits and strontium anomalies rela- ted to volcanic clastic rock in the Lishui and Ning-Wu volcanic basins in the middle and lower Yangtze reach.All these deposits and anomalies are located in the upwarped district where the fault system is often well-developed in the volcanic basin.They are identified with the similar metallogenetic conditions and deposit genesis whose geological characteristics is also similar to each other.The deposits and anomalies are controled by the volcanic clastic rock of Longwangshan cycle of Upper Jurassic series.The metallogenesis is controlled by volcanic activities and fault structures.The metallogenetic type belongs to strata-bound-volcanic hydrothermal reformation ore deposit.The early stage of metallogenesis is hydrothermal replace- ment when the ore-forming (?)element-Sr was leached out from rock and tran- sported to the hydrothermal solution and concentrated there.During the late stage, ore-forming compounds precipitated to form a industrial ore deposit.