西昆仑玛尔坎苏锰矿带晚石炭世岩相古地理特征及其对成矿的控制  

Lithofacies paleogeographical characteristics of the Late Carboniferous Malkansu metallogenic zone in West Kunlun and its control on manganese carbonates mineralization

作　　者：张帮禄 薛建玲[1,3] 吕志成 于晓飞[1,3] 李永胜 甄世民[1,3] ZHANG Banglu;XUE Jianling;LYU Zhicheng;YU Xiaofei;LI Yongsheng;ZHEN Shimin(Development and Research Center,China Geological Survey,Beijing 100037,China;China University of Geosciences,Beijing 100083,China;Mineral Exploration Technical Guidance Center,MNR,Beijing 100037,China)

机构地区：[1]中国地质调查局发展研究中心,北京100037 [2]中国地质大学(北京),北京100083 [3]自然资源部矿产勘查技术指导中心,北京100037

出　　处：《地质通报》2022年第11期2047-2064,共18页Geological Bulletin of China

基　　金：国家自然科学基金项目《西昆仑石炭纪沉积锰矿床所需特定水体环境的形成机制探究》(批准号:42102114)和《西昆仑玛尔坎苏石炭纪大型碳酸锰成矿带:主要控制因素及成矿规律》(批准号:U1703242);中国博士后科学基金资助项目《西昆仑玛尔坎苏地区锰矿石中REE的赋存形式及碳酸锰沉积成岩转化过程量化研究》(编号:2021M703018);中国地质调查局项目《矿集区矿产调查及深部找矿预测》(编号:DD20190570、DD20190571)

摘　　要：西昆仑玛尔坎苏锰矿带晚石炭世沉积岩系发育中国最富的大型碳酸锰矿床。含锰岩系岩相古地理在控制沉积锰矿形成方面具有重要意义,但目前对玛尔坎苏锰矿带晚石炭世岩相古地理特征缺乏系统研究。通过对该锰矿带内典型地段沉积剖面沉积相展布规律研究,表明矿带两端及中部含锰岩系(C_(2)k)表现为浅水环境碳酸盐岩台地相沉积特征;而在穆呼-玛尔坎土和奥尔托喀讷什矿区含锰岩系则主要发育深水台盆相沉积。斜坡相-台盆相沉积时空变化特征反映海进-海退沉积旋回。海进-海退事件可能与区域构造作用下发育的同生断裂活动有关。同生断裂可能控制该地区次级裂陷盆地沉积,进而控制金属锰的浓集和沉淀。The Upper Carboniferous Kalaatehe Formation in the Malkansu metallogenic zone,West Kunlun Mountains,hosts manganese carbonate ores with the highest Mn grade in China.The lithofacies paleogeography of manganese-bearing rock series is of great significance in controlling the formation of sedimentary manganese deposits,but there is currently a lack of systematic research on the lithofacies and paleogeography characteristics of the late Carboniferous Malkansu manganese zone.The study on the sedimentary facies of the representative sections indicate that carbonate platform facies of shallow water environment are districted at both ends and in the middle parts of the district.While in the Muhu-Malkantu and Ortokarnash,sub-basin sedimentary facies of relatively deep water deposition character the Upper Carboniferous manganese-bearing sequence.The change between ramp and sub-basin facies corresponds to the transgression-regression depositional rhythm.This likely resulted from the syn-depositional faults,which control the formation of the sub-basin and further the concentration and formation of the manganese ore intervals.

关 键 词：岩相古地理 含锰岩系 晚石炭世 玛尔坎苏锰矿带 西昆仑 矿产勘查工程 

分 类 号：P534.45[天文地球—古生物学与地层学] P531[天文地球—地质学] P618.32