摘要
本文介绍了桓仁多金属矿床的地球化学特征,并从成矿母岩及矿床围岩的含矿性、方铅矿和闪锌矿的微量元素、S、H、O、Pb同位素及稀土元素等方面讨论了该矿床的地球化学特征,对矿床成因提出了初步认识。
The Huanren ore deposit is controlled by the skarn in the contact zone of augite-diorite with the Cambrian limestone. It is characterized by complex mineral composition and ore fabrics, intensive wall-rock alteration and distinct mineralization zoning. The augite-diorite, which is the parent-rock of mineralization, has high contents of Cu, Pb, Zn, Ag, etc. The REE data indicate that it is an igneous rock derived from the mantle, with a K-Ar age of 124 Ma. Galena and sphalerite possess similar trace element associations to those observed in magmatic hydroth-ermal ore deposits. Sulfur isotopic composition (δ34S 3-6‰) indicates that the sulfur was derived from magma. Hydrogen and oxygen isotopic compositions of ore fluids (δD 49.9-76.4‰; δ18O 5.8-8.1‰) are consistent with those of magma water. Lead isotopic compositions of ore and augite-diorite provide evidence for single-stage low-μ mantle lead. Their single-stage model ages have no deviation from their K-Ar ages as well as from geological data, indicating that the mineralization took place during the Middle-Late Yenshanian movement.
出处
《地球化学》
CAS
CSCD
北大核心
1992年第3期243-254,共12页
Geochimica
