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Redox Conditions of Manganese Deposits in the Datangpo Formation, Minle Area, Western Hunan Province: Mineralogical and geochemical constraints
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Yong WANG1, 2, ChunHua WEN1, JingQiang TAN2, ChuangHua CAO1, YongGang DING2, GuangQian ZENG1, LingJue WANG1, WenQuan XIE3, LeQing HUANG1
Acta Sedimentologica Sinica | 2026, 44(4) : 1353 - 1368
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Acta Sedimentologica Sinica | 2026, 44(4): 1353-1368
Redox Conditions of Manganese Deposits in the Datangpo Formation, Minle Area, Western Hunan Province: Mineralogical and geochemical constraints
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Yong WANG1, 2, ChunHua WEN1, JingQiang TAN2, ChuangHua CAO1, YongGang DING2, GuangQian ZENG1, LingJue WANG1, WenQuan XIE3, LeQing HUANG1
Affiliations
  • 1.Geological Survey Institute of Hunan Province, Changsha 410014, China
  • 2.School of Geosciences and Info-Physics, Central South University, Changsha 410083, China
  • 3.School of Earth Sciences and Space Information Engineering, Hunan University of Science and Technology, Xiangtan, Hunan 411201, China
Published: 2026-08-10 doi: 10.14027/j.issn.1000-0550.2025.006
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Objective The western Hunan region hosts extensive Neoproterozoic marine sedimentary manganese deposits. Manganese （Mn） is a typical redox-sensitive metallic element whose enrichment in sediments is strongly correlated with the redox condition of the bottom water in the basin. A detailed study of the sedimentary redox conditions of such deposits helps to explain their metallogenic mechanisms and the constraints on their marine cycling during the mineralization period， and also provides theoretical support for the assessment of regional mineralization potential. Methods This study involved mineralogical， geochemical and inorganic carbon isotope analyses of 16 manganese ore samples of various grades from the Nanhua System Datangpo Formation in the Minle area， western Hunan. Results Mineralogical and carbon isotope analyses revealed that high-grade （MnO>20%） and medium-grade （10%<MnO<20%） manganese ores consist of predominantly subhedral granular microcrystalline rhodochrosite （grain size <5 μm） and are relatively enriched in light carbon isotope （δ13C=-10.4‰~-8.3‰； n=10）. Conversely， low-grade （MnO<10%） manganese ores contain larger- grained （>20 μm） subhedral platy rhodochrosite enriched in heavier carbon isotope （δ13C=-7.4‰~-5.3‰； n=6）. Pyrite morphology and element geochemical proxies （Mo， V， Ni concentrations and Ni/Co， V/Cr ratios） indicate that the high-grade manganese ores were deposited in oxic conditions， the medium-grade ore in suboxic conditions， and the low-grade ore in anoxic conditions. Additionally， high-grade ores exhibit geochemical characteristics indicating hydrothermal deposition （e.g.， high Eu* values and high Fe/Ti ratios）. Conclusions These findings suggest that， in the Minle area of western Hunan， the rhodochrosite in the medium- to high-grade manganese ores was formed as a result of the reaction between Mn oxides with organic matter during diagenesis， whereas in the low-grade manganese ores the rhodochrosite was probably precipitated from Mn2+ and CO32- in highly alkaline and anoxic conditions. Submarine gas-hydrothermal activity in the deep-water basin of northeastern Guizhou most likely supplied the Mn2+ ions for these manganese deposits； oxidation of bottom water in the basin was the key factor determining manganese enrichment and mineralization in the region.

Neoproterozoic  /  sedimentary manganese deposits  /  redox proxies  /  carbon isotope  /  hydrothermal activity
Yong WANG, ChunHua WEN, JingQiang TAN, ChuangHua CAO, YongGang DING, GuangQian ZENG, LingJue WANG, WenQuan XIE, LeQing HUANG. Redox Conditions of Manganese Deposits in the Datangpo Formation, Minle Area, Western Hunan Province: Mineralogical and geochemical constraints[J]. Acta Sedimentologica Sinica, 2026 , 44 (4) : 1353 -1368 . DOI: 10.14027/j.issn.1000-0550.2025.006
Funding
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  • National Key Research and Development Project(2017YFC0601506)
  • Research Foundation of the Department of Natural Resources of Hunan Province(HBZ20240128)
Appendix
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Year 2026 volume 44 Issue 4
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96
17
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Article Info
doi: 10.14027/j.issn.1000-0550.2025.006
  • Receive Date：2024-09-10
  • Online Date：2026-09-02
  • Published：2026-08-10
Article Data
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History
  • Received：2024-09-10
  • Revised：2025-02-03
  • Accepted：2025-03-11
Funding
National Key Research and Development Project(2017YFC0601506)
Research Foundation of the Department of Natural Resources of Hunan Province(HBZ20240128)
Affiliations
    1.Geological Survey Institute of Hunan Province, Changsha 410014, China
    2.School of Geosciences and Info-Physics, Central South University, Changsha 410083, China
    3.School of Earth Sciences and Space Information Engineering, Hunan University of Science and Technology, Xiangtan, Hunan 411201, China

Corresponding:

WEN ChunHua, E-mail:
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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