Geochemical results from upper Ediacaran organic-rich shales / mudstones, Yangtze Craton, South China
These data comprise geochemical results from upper Ediacaran organic-rich shales / mudstones from the Yangtze Craton (South China) from the Doushantuo Formation (member IV) and overlying lower Dengying Formation (= Miaohe Member). Ages range from about 570 to 550 Ma. The data consist of iron partitioning (Fe-speciation), phosphorus partitioning (P-speciation), bulk rock metal concentrations, total organic content and pyrite sulfur isotopes. Major and trace element concentrations of all samples were measured by inductively coupled plasma optical emission spectrometry and mass spectrometry, respectively, after quantitative HNO3-HFHClO4 digestion. Fe speciation was performed after the established methodology of Poulton and Canfield to extract operationally defined Fe phases, including Fe associated with carbonates (Fecarb), ferric oxides (Feox), magnetite (Femag), and pyrite (Fepy). The sum of these Fe pools constitutes the proportion of Fe that is considered highly reactive (FeHR) toward dissolved sulfide. Ratios of FeHR/FeT > 0.38 support FeHR enrichment and deposition under anoxic bottom water conditions, whereas values of <0.22 indicate deposition from oxic bottom waters. The intermediate range of 0.22 to 0.38 is regarded as equivocal because of the possibility for rapid sediment deposition or early diagenetic transformation of unsulfidized FeHR to poorly reactive sheet silicate minerals. For anoxic samples (FeHR/FeT > 0.38), the degree of sulfidation of the FeHR pool can be used to distinguish ferruginous (Fepy/FeHR <0.7) from euxinic (Fepy/FeHR > 0.8) conditions, with an intermediate zone ascribed to “possible euxinia”. Recent analyses of Holocene sapropels and the euxinic Lake Cadagno indicate that Fepy/FeHR > 0.6 may be a more suitable threshold for distinguishing ferruginous from possible euxinic conditions. Selected shale samples were analyzed for pyrite sulfur isotopes (δ34Spy), TOC, organic carbon isotopes (δ13Corg), and P phase associations. The P measurements use a sequential extraction method to distinguish the proportion of total P (PTot) associated with detrital apatite (Pdet) relative to potentially bioavailable and reactive (Preac) minerals, including Fe (oxyhydr)oxides (PFe),organic matter (Porg), and authigenic carbonate fluorapatite, biogenic apatite, and CaCO3-bound P (Pauth). For methods, see: S. W. Poulton, D. E. Canfield, Development of a sequential extraction procedure for iron: Implications for iron partitioning in continentally derived particulates. Chem. Geol. 214, 209–221 (2005). Fred T. Bowyer, Alexander J. Krause, Yafang Song, Kang-Jun Huang, Yong Fu, Bing Shen, Jin Li, Xiang-Kun Zhu, Michael A. Kipp, Lennart M. van Maldegem, Jochen J. Brocks, Graham A. Shields, Guillaume Le Hir, Benjamin J. W. Mills, and Simon W. Poulton Biological diversification linked to environmental stabilization following the Sturtian Snowball glaciation. Sci. Adv. 9 (34), eadf9999. DOI: 10.1126/sciadv.adf9999 (2023)
Simple
- Date (Creation)
- 2024-10-22
- Citation identifier
- http://data.bgs.ac.uk/id/dataHolding/13608293
- Point of contact
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Organisation name Individual name Electronic mail address Role University College London
Professor Graham Shields-Zhou
not available
Originator British Geological Survey
Enquiries
not available
Distributor British Geological Survey
Enquiries
not available
Point of contact
- Maintenance and update frequency
- notApplicable
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GEMET - INSPIRE themes, version 1.0
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BGS Thesaurus of Geosciences
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Ediacaran fauna
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Pyrite
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NGDC Deposited Data
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Shale
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- dataCentre
- Keywords
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NERC_DDC
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- Access constraints
- Other restrictions
- Other constraints
- restricted
- Use constraints
- Other restrictions
- Other constraints
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The copyright of materials derived from the British Geological Survey's work is vested in the Natural Environment Research Council [NERC]. No part of this work may be reproduced or transmitted in any form or by any means, or stored in a retrieval system of any nature, without the prior permission of the copyright holder, via the BGS Intellectual Property Rights Manager. Use by customers of information provided by the BGS, is at the customer's own risk. In view of the disparate sources of information at BGS's disposal, including such material donated to BGS, that BGS accepts in good faith as being accurate, the Natural Environment Research Council (NERC) gives no warranty, expressed or implied, as to the quality or accuracy of the information supplied, or to the information's suitability for any use. NERC/BGS accepts no liability whatever in respect of loss, damage, injury or other occurence however caused.
- Other constraints
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Either: (i) the dataset is made freely available, e.g. via the Internet, for a restricted category of use (e.g. educational use only); or (ii) the dataset has not been formally approved by BGS for access and use by external clients under licence, but its use may be permitted under alternative formal arrangements; or (iii) the dataset contains 3rd party data or information obtained by BGS under terms and conditions that must be consulted in order to determine the permitted usage of the dataset. Refer to the BGS staff member responsible for the creation of the dataset if further advice is required. He / she should be familiar with the composition of the dataset, particularly with regard to 3rd party IPR contained in it, and any resultant use restrictions. This staff member should revert to the IPR Section ( ipr@bgs.ac.uk) for advice, should the position not be clear.
- Spatial representation type
- Grid
- Language
- English
- Topic category
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- Geoscientific information
- Geographic identifier
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SOUTHERN CHINA [id=519700]
British Geological Survey Gazetteer: Geographical hierarchy from Geosaurus 1979 creation
- Begin date
- 2018-01-01
- End date
- 2024-08-31
- Unique resource identifier
- WGS 84 (EPSG::4326)
- Distribution format
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Name Version Excel (xlsx)
- Distributor contact
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Organisation name Individual name Electronic mail address Role British Geological Survey
Enquiries
not available
Distributor
- OnLine resource
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Protocol Linkage Name https://webapps.bgs.ac.uk/services/ngdc/accessions/index.html#item186399 Data
- Hierarchy level
- Dataset
- Other
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dataset
Conformance result
- Title
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INSPIRE Implementing rules laying down technical arrangements for the interoperability and harmonisation of Geology
- Date (Publication)
- 2011
- Explanation
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See the referenced specification
- Pass
- No
Conformance result
- Title
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Commission Regulation (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services
- Date (Publication)
- 2010-12-08
- Explanation
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See http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=OJ:L:2010:323:0011:0102:EN:PDF
- Pass
- No
- Statement
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ICP-AES, ICP-OES (after quantitative HNO3-HFHClO4 digestion) TOC (LECO® SC-144DR Dual Range carbon and sulfur analyser) Pyrite S isotopes (extracted using the chromium reduction method and analysed on an Elementar Pyrocube coupled to an Isoprime continuous flow mass spectrometer)
Metadata
- File identifier
- 253b4319-d54a-1989-e063-0937940a06e5 XML
- Metadata language
- English
- Hierarchy level
- Dataset
- Date stamp
- 2024-12-11
- Metadata standard name
- UK GEMINI
- Metadata standard version
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2.3
- Metadata author
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Organisation name Individual name Electronic mail address Role British Geological Survey
Point of contact
- Dataset URI