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- W2756230537 abstract "Research Article| July 07, 2017 Meishucun phosphorite succession (SW China) records redox changes of the early Cambrian ocean Ze-Rui Ray Liu; Ze-Rui Ray Liu † 1Department of Earth Sciences, University of Hong Kong, Pokfulam Road, Hong Kong, China †Zhou, corresponding author—mfzhou@hkucc.hku.hk; Liu—guayu@126.com. Search for other works by this author on: GSW Google Scholar Mei-Fu Zhou Mei-Fu Zhou † 1Department of Earth Sciences, University of Hong Kong, Pokfulam Road, Hong Kong, China2State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China †Zhou, corresponding author—mfzhou@hkucc.hku.hk; Liu—guayu@126.com. Search for other works by this author on: GSW Google Scholar Author and Article Information Ze-Rui Ray Liu † 1Department of Earth Sciences, University of Hong Kong, Pokfulam Road, Hong Kong, China Mei-Fu Zhou † 1Department of Earth Sciences, University of Hong Kong, Pokfulam Road, Hong Kong, China2State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China †Zhou, corresponding author—mfzhou@hkucc.hku.hk; Liu—guayu@126.com. Publisher: Geological Society of America Received: 12 Jun 2016 Revision Received: 23 Mar 2017 Accepted: 05 May 2017 First Online: 07 Jul 2017 Online Issn: 1943-2674 Print Issn: 0016-7606 © 2017 Geological Society of America GSA Bulletin (2017) 129 (11-12): 1554–1567. https://doi.org/10.1130/B31612.1 Article history Received: 12 Jun 2016 Revision Received: 23 Mar 2017 Accepted: 05 May 2017 First Online: 07 Jul 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Ze-Rui Ray Liu, Mei-Fu Zhou; Meishucun phosphorite succession (SW China) records redox changes of the early Cambrian ocean. GSA Bulletin 2017;; 129 (11-12): 1554–1567. doi: https://doi.org/10.1130/B31612.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGSA Bulletin Search Advanced Search Abstract Two early Cambrian phosphorite units from the Meishucun section, SW China, were investigated to decipher the mechanism of phosphogenesis and to understand the redox states of the early Cambrian ocean. Rocks from the lower unit contain abundant cyanobacterial-like microfossils and radial francolite aggregates, and they have oolitic textures, a negative δ13Ccarb shift, and kerogen-like rare earth element (REE) patterns. These rocks were derived from degradation of organisms and were subsequently reworked by high-energy water. In contrast, rocks from the upper unit are dominated by stumpy francolite and have high Zn (40-185 ppm) and Pb (15–845 ppm) contents and seawater-like REE patterns, indicating that P adsorption and regeneration were mediated by Fe-(oxyhydr)oxides. Phosphorites in this unit were episodically exposed above the wave base and are characterized by bedding structures. Rocks from the lower unit have low V (3–18 ppm) and Cr (7–20 ppm) contents and negative δ97/95Mo values, clearly suggesting that the ambient water was oxygenated due to proliferation of cyanobacteria. The upper unit must have formed near a Fe-redox boundary in sediments that allowed the transformation between Fe3+ and Fe2+, consistent with high V (18–55 ppm) and Cr (20–62 ppm) contents, and positive δ97/95Mo values in the unit. The oceanic reduction may be attributed to the ca. 535 Ma volcanism and hydrothermal venting in the basin. Similar compositions of phosphorites from the lower unit and equivalents elsewhere indicate that the early Cambrian phosphogenesis was controlled mainly by proliferation of primary producers. Given that shallow water above the wave base can be well mixed and in equilibrium with atmospheric oxygen, the subsequent reducing environment in the ocean recorded in the upper unit may have been a global phenomenon. You do not have access to this content, please speak to your institutional administrator if you feel you should have access." @default.
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- W2756230537 date "2017-07-07" @default.
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- W2756230537 title "Meishucun phosphorite succession (SW China) records redox changes of the early Cambrian ocean" @default.
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- W2756230537 doi "https://doi.org/10.1130/b31612.1" @default.
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