Lithofacies paleogeographical characteristics of the Late Carboniferous Malkansu metallogenic zone in West Kunlun and its control on manganese carbonates mineralization
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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(C2k)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。
Abstract: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.
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图 3 玛尔坎苏弧后盆地乌赤别里山口、奥尔托喀讷什、苏萨尔布拉克、琼喀讷什沟、穆呼-玛尔坎土和喀拉阿特河剖面地层柱状图(图中展示喀拉阿特河组地层厚度和锰矿化层位据参考文献[10])
Figure 3.
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① 河南省地质调查院.新疆1：5万喀腊嘎依恰提幅、克牙孜幅、玛里他巴尔山幅、博托彦幅、穆呼幅区域地质调查报告.中国地质调查局,2013.
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