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Pingguo |
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Guangxi, China |
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The Pingguo bauxite deposit is located ~100 km NW of Nanning in Guangxi Province, China (#Location: 23° 25' 30"N, 107° 37' 28"E).
The deposit overlies the karstic limestone topography of the Permian Maokou Formation of western Guangxi and are apparently the product of weathering of overlying basalts belonging to the Permian Emeishan Large Igneous Province (LIP).
The bauxite bearing mass is composed of three distinct layers:
i). a lower band, dominated by ferric clay or weathered iron oxides,
ii). a middle layer of cryptocrystalline and oolitic bauxite ore, and
iii). an upper unit dominated by argillaceous bauxite.
The bauxite ore is predominantly composed of diaspore, pyrite, chamosite and anatase, whilst the argillaceous bauxite contains diaspore, kaolinite, pyrophyllite, pyrite and anatase.
Two types of pyrite have been identified from the bauxite: i). fine-grained and framboidal pyrite (Py1), which occurs in aggregates, enriched in trace elements and is thought to have a diagenetic origin, and ii). coarse-grained and euhedral pyrite which is deficient in trace elements and is considered to have formed by later recrystallisation. The S isotopic composition of pyrite (-34.11 to -18.91‰) and visible ovoid microorganisms within the bauxite provide evidences of microbial activity during bauxite formation. Microorganisms were likely to have enhanced the dissolution and weathering of the parent rock and facilitated the precipitation of diaspore under near-surface conditions.
The district is estimated to contain >0.5 Gt of bauxite. It supports a large smelter, 15 km to the SW at the town of Pingguo.
The most recent source geological information used to prepare this decription was dated: 2017.
This description is a summary from published sources, the chief of which are listed below.
© Copyright Porter GeoConsultancy Pty Ltd. Unauthorised copying, reproduction, storage or dissemination prohibited.
Pingguo
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Selected References:
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Ling, K., Wen, H., Han, T., Lu, Z., Cui, Y., Luo, C. and Yu, W., 2024 - Lithium-rich claystone in Pingguo area, Guangxi, southwest China: precursor kaolinite controls lithium enrichment: in Mineralium Deposita v.59, pp. 329-340.
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Liu, X., Wang, Q., Zhang, Q., Yang, Y., Liang, Y., Zhang, Y., Li, Y. and Guan, T., 2017 - Genesis of the Permian karstic Pingguo bauxite deposit, western Guangxi, China: in Mineralium Deposita v.52, pp. 1031-1048.
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Porter GeoConsultancy Pty Ltd (PorterGeo) provides access to this database at no charge. It is largely based on scientific papers and reports in the public domain, and was current when the sources consulted were published. While PorterGeo endeavour to ensure the information was accurate at the time of compilation and subsequent updating, PorterGeo, its employees and servants: i). do not warrant, or make any representation regarding the use, or results of the use of the information contained herein as to its correctness, accuracy, currency, or otherwise; and ii). expressly disclaim all liability or responsibility to any person using the information or conclusions contained herein.
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