岩石圈减薄与成矿关系的不均一性

Inhomogeneity of Relationship Between Lithospheric Thinning and Mineralization

结合实际工作中的体会,提出和讨论了"岩石圈减薄与成矿关系的不均一性"这一有意义的科学问题。岩石圈减薄导致岩石圈中分布不均一的金、钼、钨等成矿元素被消耗带出至地壳中成矿,是中国东部金、钼、钨大规模成矿的基本机制;华北地块岩石圈减薄对金、钼、钨大规模成矿的贡献时限始自构造转折开始时而终至岩浆富集地幔源向亏损地幔源转化期,即可能在163～136 Ma至117～80 Ma期间;岩石圈在时间和空间上的不均一减薄可能是地壳中不同类型的金、钼、钨等矿床和矿集区时空分布差异性的重要原因。

The inhomogeneity of relationship between lithospheric thinning and mineralization were put forward and discussed.The basic mechanism for mineralization of gold,molybdenum and tungsten in large in Eastern China was that gold,molybdenum and tungsten deposits,which were inhomogeneous in lithosphere because of lithospheric thinning,were depleted and taken into earth crust.The time ranges for mineralization of gold,molybdenum and tungsten in large caused by lithospheric thinning in North China Craton,began from tectonic transition and ended in period of magma transforming from enriched mantle source to depleted mantle source,could be from 163-136 Ma to 117-80 Ma.The important reason for the difference of time-space distribution of gold,molybdenum and tungsten deposits and ore concentration areas could be the inhomogeneous lithospheric thinning in time and space.