四川省青川县马公锰矿地质特征及找矿预测

Geological characteristics and ore prediction of Magong Mn deposit in Qingchuan county,Sichuan province

马公锰矿是川西北地区近年来新发现的具有找矿潜力的石坎式锰矿床,矿区共发现2个锰矿层,共圈出锰矿体5个,矿体倾向NW,呈层状、似层状分布,厚度大、延深稳定,地表以氧化锰矿为主,深部为碳酸锰。在阐述马公锰矿矿床地质特征的基础上,总结了矿区的找矿标志,认为马公锰矿属于海相沉积型锰矿,严格受地层层位的控制,多形成于沉积环境转变之际,其含矿层位为下寒武统邱家河组,含矿岩性为含碳白云质硅质板岩;预测矿区附近同层位具有较好的锰矿找矿前景。

Magong Mn deposit is a newly discovered Shikan-style Mn deposit with prospecting potential in the Northwest Sichuan province.Two Mn ore layers occur in the property and 5 ore bodies have been located.The ore bodies are thick,layered or layeroid dipping NW and extending stably to depth along the dip.At surface the ore is dominated by Mn oxide and turns to Mn carbonate to depth.In this paper geological characteristics are described and the prospecting marks summarized.We consider that the Mn deposit is a marine sedimentary deposit controlled strictly by stratigraphy horizonand occurring at the place where take place rock facies change.Qiujiahe formation of Lower Cambrian Series is the ore-bearing horizon and the carbonaceous dolomitic siliceous slate the ore-bearing lithology.The same horizon in surroundings is predicted potential for further prospecting.