摘要
本文主要对秦岭凤太矿田泥盆系铅-锌矿床的海底喷气成矿特征进行了较深入的研究,剖析了不同类型矿化的形成机制及其空间分布规律,并揭示了研究海底喷气成矿类型及其空间分布规律的理论与实践意义。
The Fengtai Pb-Zn ore field is located in the middle sector of the Devonian Qinling lead-zinc (copper)polymetallic metallogenic zone, and tectonically lies within the Paleozoic Qinling intercontinental rift system between the Yangtze plate and the North China plate. The Pb-Zn deposits in the field mainly occur near syndepositional faults, and are obviously controlled by palaeostructure. There are two types of orebody, stratiform and network, implying two different origins, syngenitic and epigenitic. The main host rocks are represented by a special kind of siliceous rock, showing hydrothermal-sedimentary features. The ore substances were derived from the basement, and the ore-forming elements exhibit both lateral and vertical zoning. The above-mentioned, features suggest that the lead-zinc deposits of the Fengtai ore field belong to stratabound deposits of submarine exha lative-sedimentary type. Furthermore, the spatial distribution of the two types of mineralization shows notable regularities. Vertically, the stratiform mineralization of exhalative-sedimentary type occurs in the transional horizon from limestone of the Gudaoling Formation (D_2) to pelite of the Xinghongpu Formation (D_3), while the network mineralization of metasomatic type lies below the stratiform miner- alization. Laterally, the exhalative-sedimentary mineralization is developed in a relatively confined Devonian sedimentary basin in the south of the field, while the exhalative-metasomatic mineralization occurs near a regional syndepositional fault in the north of the field.A study of the submarine exhalative mineralization types and their spatial distribution patterns is of great importance. The oritically it helps ascertain the origin of stratabound deposits with different mineralization characteristics, and in the prospecting practice it may guide the search for new ore deposits and orebodies.
出处
《地质论评》
CAS
CSCD
北大核心
1990年第5期394-403,共10页
Geological Review
