首页|Integrated Stratigraphy and Mineralogy of the Doushantuo Formation in Weng'an,South China,and Implications for Ediacaran Phosphogenesis

Integrated Stratigraphy and Mineralogy of the Doushantuo Formation in Weng'an,South China,and Implications for Ediacaran Phosphogenesis

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The Ediacaran-Cambrian Phosphogenic Episode is the Earth's first true phosphogenic event and resulted in worldwide phosphate deposits,which occurred during the processes of the Neo-proterozoic Oxygenation Event.The Ediacaran Doushantuo Formation(ca.635-551 Ma)of Weng'an area in central Guizhou,South China,contains two economic phosphorite beds(the Lower and Upper Phosphorite Beds).This paper presents a detailed stratigraphic,sedimentological and mineralogical study of multiple outcrop and drill core sections of the Doushantuo Formation across the Weng'an ar-ea,and identified 11 lithofacies and 4 types of phosphatic grains.Significant differences in lithofacies and grain types between the upper and lower phosphate deposits are observed,indicating that the two sets of phosphate deposits are the products of two distinct phosphogenic processes.The Lower Phos-phorite Bed mainly consists of banded and laminated phosphorites,contains micro-oncoids formed by microbially-mediated precipitation and peloids formed by in-situ chemically oscillating reactions,indi-cating a biochemical and chemical enrichment of phosphorus to sediments during the Early Ediacaran Period.The Upper Phosphorite Bed is mainly composed of carbonaceous,massive,and stromatolitic phosphorites,contains bioclasts(phosphatized spheroidal fossils),and intraclasts formed by hydrody-namic agitation,suggesting that the major accesses of phosphorus to sediments were the remineraliza-tion of organic P.Deposition of the two economic phosphorite beds was controlled by two sea-level cy-cles.Such differences have also been documented in contemporaneous phosphate-bearing successions in Brazil and Mangolia,indicating a significant shift in global phosphogenic mechanism during the ear-ly and middle Ediacaran,which may be due to the changes in redox conditions in seawater,associated with the Neoproterozoic Oxygenation Event.These regional active P-cycle processes could produce more free oxygen,which may have contributed to the upcoming Phanerozoic global oxidation.

phosphoritelithofaciesphosphatic grainsphosphogenic paragenesisphosphorus cy-clemineralogy

Liangxuan Jiao、Zhenbing She、Dominic Papineau、Yaguan Zhang、Matthew S.Dodd、Kenan Cao、Qun Chen、Guoyong Chen

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State Key Laboratory of Biogeology and Environmental Geology,China University of Geosciences,Wuhan 430078,China

School of Earth Sciences,China University of Geosciences,Wuhan 430047,China

London Centre for Nanotechnology,17-19 Gordon Street,University College London,London WC1E 6BT,UK

Department of Earth Sciences,University College London,London WC1E 6BT,UK

Centre for Planetary Science,University College London and Birkbeck College,London WC1E 7HX,UK

Innovation Center of Ore Resources Exploration Technology in the Region of Bedrock,Ministry of Natural Resources of People's Republic of China,Guiyang 550000,China

Guizhou Bureau of Geology and Mineral Exploration and Development,Guiyang 550000,China

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中国科学院战略规划重点项目国家自然科学基金State Key Laboratory of Biogeology and Environmental Geology,China University of GeosciencesGuizhou Provincial Department of Science and Technology Guizhou Science Foundation

XDB2602010241272038GBL12001[2016]1407

2024

10.1007/s12583-022-1765-3

地球科学学刊(英文版)
中国地质大学

地球科学学刊(英文版)

CSTPCD
影响因子：0.724
ISSN：1674-487X
年,卷(期)：2024.35(2)
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