湖南省花垣县民乐锰矿地质特征及找矿方向分析

花垣县民乐锰矿属于典型的“大塘坡式”锰矿,位于松桃成锰沉积盆地中部,是我国南华系锰矿的集中分布区。锰矿赋存于南华系下统大塘坡组第一段炭质页岩下部,矿体呈层状、似层状产出,受地层、岩性、含锰岩系厚度、古构造、岩相古地理环境控制。本次通过对民乐锰矿地质特征、矿区锰富集规律分析,进一步从岩相古地理、古构造、后期断裂构造对矿体影响进行了综合研究,再结合物探音频大地电磁测深初步推测锰矿层埋藏深度,最后与毗邻松桃地区锰矿进行类比,提出了下一步找矿方向。

Geological characteristics and prospecting direction of the Minle manganese deposit in Huayuan County, Hunan Province

The Minle manganese deposit in Huayuan County is a typical "Datangpo" manganese deposit, located in the middle of Songtao Manganese Depositional Basin, which is the concentrated distribution area of manganese deposits in South China. Manganese deposits occur in the lower part of the first member of the Datangpo Formation of the Lower South China System. The ore bodies occur in layered and bedlike formations, which are controlled by strata, lithology, thickness of manganese-bearing rock series, paleostructure, lithofacies and paleogeographic environment. Based on the analysis of the geological characteristics of Minle manganese deposit and the regularity of manganese enrichment in the mining area, the influence of lithofacies palaeogeography, palaeostructure and late fault structure on the orebody is further studied comprehensively. Then the burial depth of manganese deposit is preliminarily estimated by using the combined prospecting audio-frequency magnetotelluric sounding. Finally, the next prospecting direction is put forward by analogy with the manganese deposit in the adjacent Songtao area.