Full
DU Yuansheng,born in 1958,is a professor and doctoral supervisor at China University of Geosciences(Wuhan). His research focuses on sedimentary geology. E-mail: duyuansheng126@126.com.
Outline
The Jiujialu Formation of the Lower Carboniferous in central Guizhou Province represents a significant bauxite-bearing stratigraphic unit in the region. This study aims to clarify the metallogenic geological setting and the dominant ore-forming processes of the bauxite deposits within the Jiujialu Formation in central Guizhou Province. Based on the theoretical framework of metallogenic sedimentology and supported by quantitative palaeogeographic reconstruction,the study employs an integrated approach combining petrology,sedimentology,and sedimentary geochemistry of the ore-bearing deposit to reconstruct the palaeoenvironment and explore the mechanisms of bauxite formation. The findings indicate that during the Early Carboniferous,central Guizhou Province was characterized by a nearshore karst peneplain depositional setting. The aluminous strata developed within a closed,karst-depression-controlled lacustrine-marsh wetland environment. The basal iron-rich section of the Jiujialu Formation represents Fe-enriched interval formed from relict slope deposits of ancient weathering crusts. The overlying clay-rich interval comprises dark clay rocks formed in transitional facies influenced by marine transgression or inundation. The middle aluminous section shows a regular vertical succession of lithofacies,including layered claystone,massive bauxite or bauxitic rock,pisolitic bauxite,clastic bauxite,and porous bauxite. This lithofacies assemblage reflects a metallogenic process combining both wetland sedimentation and subaerial leaching under subaerial exposure conditions. The deposition of Al-rich source rocks was followed by desiccation of the lacustrine-wetland system and the formation of a vadose leaching sequence under the influence of fluctuating groundwater levels. Based on these results,a metallogenic model for the bauxite deposits of the Jiujialu Formation in the Lower Carboniferous of central Guizhou Province is proposed.
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| 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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