| 陈 龙.重庆城口锰矿红籽矿区地质特征及控矿因素分析[J].地质与勘探,2020,56(5):915-927 |
| 重庆城口锰矿红籽矿区地质特征及控矿因素分析 |
| Geological characteristics and ore controlling factors of the Hongzi mining area, Chengkou manganese deposit, Chongqing |
| 投稿时间：2019-11-23 修订日期：2020-07-06 |
| DOI：10.12134/j.dzykt.2020.05.003 |
| 中文关键词: 城口锰矿 红籽矿区 地质特征 控矿因素 |
| 英文关键词: Chengkou manganese deposit area, Hongzi mining area, geological characteristics, ore control factor |
| 基金项目:中国地质调查局整装勘查区找矿预测与技术应用示范子项目（编号：DD20160050）、重庆市国土资源和房屋管理局科研项目（编号：KJ-2017014）、重庆市市级财政勘查项目“重庆市城口县红籽村锰矿预查”共同资助 |
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| 中文摘要: |
| 城口锰矿整装勘查区空白区块全隐伏锰矿体的揭露，标志着城口锰矿整装勘查深部找矿取得重大突破。红籽矿区锰矿呈层状产于陡山沱组顶部，层位稳定。根据岩芯观察、剖面观察、薄片观察、大比例尺地质填图等，展开了岩石学、地层学、沉积学、矿田构造地质学研究，认为红籽矿区菱锰矿层为陡山沱末期深海相向碳酸岩台地过渡时期产物，具台地边缘斜坡沉积特征。首次报道城口锰矿锰质热液运移通道疑似证据以及南大巴山北相区龙潭河组为城口锰矿锰质物源潜力大陆风化源区，红籽矿区矿层中微体藻类降解集合体以及红籽矿区西侧锰质叠层石的发现，再次证实了微生物在成矿过程中的富集作用。锰矿矿石矿物为菱锰矿，矿石结构以微晶、藻鲕为主。综合研究表明沉积相及物质来源控制了矿层沉积，区域叠瓦状-逆冲推覆作用与右型走滑作用控制了矿区锰矿产出形态，红籽矿区B断块、修齐矿区以南至坪坝-修齐断裂之间区块为下一步2000m以浅深部勘探有利区。 |
| 英文摘要: |
| The discovery of a fully concealed manganese ore body in the blank area of the Chengkou manganese deposit integrated exploration area marks a major breakthrough in the deep exploration of the mining district. The manganese ore in the Hongzi mining area occurs in layers at the top of Doushantuo Formation with stable horizons. Based on observations to cores, profiles, and thin sections and large-scale geological mapping, a study of petrology, stratigraphy, sedimentology and ore field structural geology has been carried out. It is considered that the siderite manganese deposit is a product of the transition period from deep sea to carbonate platform at the end of Doushantuo Formation and has the sedimentary characteristics of a platform margin slope. It is the first time to report the evidence of the suspected hydrothermal channel of manganese ore forming minerals in the Chengkou manganese deposit area, and Longtanhe formation in the north stratigraphic area of South Dabashan Thrust belt is the potential of manganese provenance continental weathering source area of Chengkou manganese deposit. The microalgae degradation aggregate in the ore bed of the Hongzi ore area and the manganese stromatolite in the west of the Hongzi mining area that once again confirms the enrichment of manganese by microorganisms in the generation process of manganese deposit. The manganese ore mineral is rhodochrosit and the manganese ore structure is mainly crystallite and algal oolite. Comprehensive research shows that imbricated thrust napped structure and right-type strike-slip structure controled the manganese ore production form in the ore area. The block B in the Hongzi mining area and the area between the south boundary of the Xiuqi mining area and the Pingba-Xiuqi fault are favorable exploration areas at depth less than 2000m. |
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