湖北宜昌—兴神磷矿田北向延伸矿层变化研究

Variations of the north-extending seams in the Yichang- Xingshen phosphate mine of Hubei Province

湖北宜昌—兴神磷矿成矿时期为新元古代震旦纪陡山沱期,主要工业矿层为中磷层二矿层（Ph22）和下磷层三矿层（Ph31）,二者自北西向南东均呈带状展布,大致平行排列。由南向北,主矿带由Ph31转变为Ph22,间接验证了海侵方向。根据已发现磷矿区的分布,结合正在工作的兴神保地区,从构造环境、含矿岩系、矿石自然类型等方面探讨了宜昌—兴神磷矿田由南向北、由浅向深的矿层变化情况。

The main mineralization period of the Yichang-Xingshen phosphate mine belongs to Doushantuo Stage in Sinian Period of Neoproterozoic Era. The main industrial seams of this mine are the second seam of the middle phosphate seam（ Ph22 ） and the third seam of the lower phosphate seam （ Phi ） ; these two seams show a parallel zonal distribution extending from NW to SE, and their north-ex- tending variation from ph31 to Ph~ indirectly validates the direction of transgression. The study discussed the variations of the seams from south to north and shallow to deep in the aspects of structural environments, ore-bearing rocks series and ore types.