Nanhuan (Cryogenian) Stratigraphic Sequence in Central-south China and Its Response for Major Geological Events
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摘要: 罗迪尼亚超大陆裂解、雪球地球、锰铁成矿作用耦合是南华纪重大地质事件。中南地区南华纪地层广泛分布,自北而南沉积类型丰富,本文以冰期沉积、锰矿层和铁矿层为标志,以同位素年龄为格架,厘定了南华纪岩石地层和年代地层序列,自北而南对比了超大陆裂解事件、斯图特冰期、马里诺冰期、成锰事件、成铁事件、火山事件和早期生命演化事件沉积的差异性。本文认为中南地区南华系表现为两次冰期和一次间冰期的沉积特征,下铁上锰、南铁北锰的时空格局揭示了裂谷的演化历程。建议进一步聚焦南华系存在的关键地质问题,加强锰铁成矿作用与全球重大地质事件的响应关系调查研究,为新一轮找矿突破战略行动提供理论支撑。Abstract: Breakup of the Rodinia Supercontinent, the Snowball Earth and manganese and iron mineralization coupling have been significant geological events during the Nanhuan (Cryogenian). The Nanhuan strata has been widely distributed in Central-south China, with variety sedimentation types being gradual transition from south to north. This review redefines the Nanhuan lithostratigraphy and chronostratigraphy sequence in Central-south China in the framework of regional glacial deposits, manganese deposits, iron deposits and isotopic ages. Regional geological events including breakup, Sturtian and Marinoan, manganization and iron-forming, volcanism activity, and early life evolution have been compared from north to south, focusing on the differences. This paper approved two glaciations with one interglaciation sedimentation preserved in Central-south China. And rifting evolution could be revealed by temporal and spatial distribution of iron and manganese. Further geological survey could be aimed at relationship between regional manganese-iron mineralization and global geological events to provide basic geological supports for the Prospecting Breakthrough Strategy Action.
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Key words:
- Nanhuan /
- Snowball Earth /
- manganese deposit /
- iron ore bed /
- supercontinent breakup
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