新疆阿克陶县奥尔托喀讷什锰矿地质特征及成因探讨  

Geological Characteristics and Genesis of the Aoertuokanashi Manganese Deposit in Aketao County,Xinjiang

作　　者：王军 李生全 黄河 李向军 WANG Jun;LI Sheng-quan;HUANG He;LI Xiang-jun(Qinghai Geological Exploration Institute of China Metallurgical Geology Bureau,Xining,Qinghai 810000;Northwest Geological Exploration Institute of China Metallurgical Geology Bureau,Xi'an,Shaanxi 710061)

机构地区：[1]中国冶金地质总局青海地质勘查院,青海西宁810000 [2]中国冶金地质总局西北地质勘查院,陕西西安710061

出　　处：《地质与勘探》2018年第S01期1338-1343,共6页Geology and Exploration

摘　　要：新疆阿克陶县奥尔托喀讷什地区具有巨大的锰矿找矿潜力,并在近年来取得重大找矿突破。目前该锰矿区已累计查明资源储量(121b+122b+331+332+333)1206.74万吨,矿床平均品位37.82%。锰矿赋存于上石炭统喀拉阿特河组(C 2 k)含碳泥质灰岩夹薄层细晶灰岩条带中,该套含锰岩系岩石组合具有滨浅海相沉积物的特征。矿体呈层状、似层状、条带状产出,层位稳定,出露长度40km,矿体厚度0.5~22m不等,矿石矿物主要为菱锰矿,其次软锰矿,少量硅酸锰。矿石主要为微晶结构、细粒结构,致密块状构造、浸染状构造。该锰矿床P/Mn平均值为0.0056,Mn/TFe平均值为14.01,属于中磷富锰矿床。奥尔托喀讷什锰矿床的形成可能与晚古生代期间强烈拉张环境下火山活动形成的大量火山岩以及弧后拉张拗陷环境海水热液活动有关。The Aoertuokanashi region of Akto County,Xinjiang hosts a huge prospecting potential of manganese ores,where a significant breakthrough in prospecting has been made in recent years.At present,total identified Mn resource reserves of this mine area reach(121b+122b+331+332+333)12.0674×104 tons with an average grade of 37.82%.The manganese deposit occurs in fine-grained limestone strips containing carbonaceous argillaceous limestone in the Upper Carboniferous Karatite Formation(C 2 k),featured by superficial marine sediments.The orebodies are layered,quasi-stratified,and banded,with stable horizons,exposed lengths of 40km,and orebody thicknesses ranging from 0.5m to 22m.The ore minerals are dominated by rhodochrosite,next pyrolusite,and a small amount of silica manganese.The ore is mainly of microcrystalline,fine grain,dense massive and disseminated structures.The average value of P/Mn of this manganese deposit is 0.0056,and Mn/TFe is 14.01,attributed to middle phosphorus-rich manganese manganese deposits.The formation of this manganese deposit may be related to the large amount of volcanic rocks formed by volcanic activity in an intense extension environment and activity of marine hydrothermal fluids in a back-arc extension-depression during the Late Paleozoic.

关 键 词：沉积型锰矿 矿床地质特征 矿床成因 晚古生代 奥尔托喀讷什 新疆 

分 类 号：P624.6[天文地球—地质矿产勘探]