A Comparative Study of the Geochemical Characteristics and Genetic Mechanisms of Sedimentary Manganese Deposits from the Permian and Nanhua Periods in Hunan Province
5 affiliations
- 1Hunan Provincial Key Laboratory of Geochemical Processes and Resource Environmental Effects , , ,
- 2China Geological Survey , , ,
- 3Geophysical and Geochemical Survey Institute of Hunan Province , , ,
- 4Geological Survey Institute of Hunan Province , , ,
- 5China University of Geosciences , ,
Abstract
This study presents a comparative geochemical and mineralogical investigation of two representative sedimentary manganese deposits in Hunan Province, China: the Datangpo Formation deposit in Xiangtan and the Gufeng Formation deposit in southern Hunan. The Shuibutou deposit (Gufeng Formation) is hosted in carbonate rocks and is dominated by Mn-bearing calcite, exhibiting near-zero δ13Ccarb values (−0.13‰ to 0.95‰), positive Y anomalies, high Y/Ho ratios (average 36.19), and enrichment in redox-sensitive elements (average MoEF = 88.5; average UEF = 19.7), together with abundant framboidal pyrite (<8 μm), and these features are consistent with formation under an anoxic environment via direct precipitation of manganese carbonates. In contrast, the Xiangtan Datangpo deposit is hosted in black shales and characterized by rhodochrosite, negative δ13Ccarb values (−7.43‰ to −5.79‰), pronounced positive Ce anomalies, and low concentrations of redox-sensitive elements (e.g., low Mo/Al, U/Al ratios), suggesting initial Mn oxide precipitation under oxic conditions followed by diagenetic transformation. Based on these differences, two distinct metallogenic models are proposed: (1) a two-stage process involving Mn oxide precipitation and subsequent diagenetic reduction for the Datangpo deposit, and (2) direct precipitation of manganese carbonates in an anoxic water column for the Shuibutou deposit. Although both formed in fault-controlled rift basins under extensional settings, their contrasting redox conditions led to fundamentally different mineralization pathways. These findings provide new insights into the genetic diversity of sedimentary manganese deposits and have important implications for mineral exploration.
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BibTeX
@article{xu2026comparative,
title = {{A Comparative Study of the Geochemical Characteristics and Genetic Mechanisms of Sedimentary Manganese Deposits from the Permian and Nanhua Periods in Hunan Province}},
author = {Junwei Xu and Fengchu Liao and Hantao Wei and Zhaozhao Tan and Aili Li and Leqing Huang and Suxin Li and Lifen Zhu and Fangge Chen},
journal = {ACS Omega},
year = {2026},
month = oct,
doi = {10.1021/acsomega.6c04186},
url = {https://pubs.acs.org/acsodf/article/doi/10.1021/acsomega.6c04186/5459741/A-Comparative-Study-of-the-Geochemical},
note = {CC BY-NC-ND 4.0},
}
RIS
TY - JOUR
TI - A Comparative Study of the Geochemical Characteristics and Genetic Mechanisms of Sedimentary Manganese Deposits from the Permian and Nanhua Periods in Hunan Province
AU - Junwei Xu
AU - Fengchu Liao
AU - Hantao Wei
AU - Zhaozhao Tan
AU - Aili Li
AU - Leqing Huang
AU - Suxin Li
AU - Lifen Zhu
AU - Fangge Chen
PY - 2026
DA - 2026/10/28
JO - ACS Omega
DO - 10.1021/acsomega.6c04186
UR - https://pubs.acs.org/acsodf/article/doi/10.1021/acsomega.6c04186/5459741/A-Comparative-Study-of-the-Geochemical
AB - This study presents a comparative geochemical and mineralogical investigation of two representative sedimentary manganese deposits in Hunan Province, China: the Datangpo Formation deposit in Xiangtan and the Gufeng Formation deposit in southern Hunan. The Shuibutou deposit (Gufeng Formation) is hosted in carbonate rocks and is dominated by Mn-bearing calcite, exhibiting near-zero δ13Ccarb values (−0.13‰ to 0.95‰), positive Y anomalies, high Y/Ho ratios (average 36.19), and enrichment in redox-sensitive elements (average MoEF = 88.5; average UEF = 19.7), together with abundant framboidal pyrite (<8 μm), and these features are consistent with formation under an anoxic environment via direct precipitation of manganese carbonates. In contrast, the Xiangtan Datangpo deposit is hosted in black shales and characterized by rhodochrosite, negative δ13Ccarb values (−7.43‰ to −5.79‰), pronounced positive Ce anomalies, and low concentrations of redox-sensitive elements (e.g., low Mo/Al, U/Al ratios), suggesting initial Mn oxide precipitation under oxic conditions followed by diagenetic transformation. Based on these differences, two distinct metallogenic models are proposed: (1) a two-stage process involving Mn oxide precipitation and subsequent diagenetic reduction for the Datangpo deposit, and (2) direct precipitation of manganese carbonates in an anoxic water column for the Shuibutou deposit. Although both formed in fault-controlled rift basins under extensional settings, their contrasting redox conditions led to fundamentally different mineralization pathways. These findings provide new insights into the genetic diversity of sedimentary manganese deposits and have important implications for mineral exploration.
SN - 2470-1343
ER -