Details
| Original language | English |
|---|---|
| Article number | 103927 |
| Journal | Global and planetary change |
| Volume | 216 |
| Publication status | Published - Sept 2022 |
| Externally published | Yes |
Abstract
The geodynamic reorganization of major cratonic blocks during the assembly of Gondwana in the late Neoproterozoic caused a (bio)geochemical evolution of marine habitats that witnessed fluctuating seawater oxygenation and nutrient fluxes. Previous studies of carbonates deposited on the Yangtze Platform (South China) have shown their use as reliable archives of paleo-redox and bio-productivity changes intrinsically linked to continental weathering fluxes and water mass cycling. Despite its complex submarine morphology, only a few carbonate-bearing sections comprising deeper depositional environments of the Yangtze Platform have been evaluated. Here we report temporal, lateral, and vertical variations of stable C and radiogenic Sr, Nd, and Os isotopic compositions together with trace element and rare earth and yttrium (REY) systematics in carbonates from the Doushantuo Formation representing different paleo-marine environments of the Yangtze Platform, including I) inner shelf, II) restricted intra-shelf basin, III) slope and IV) deep-water basin sections to trace the extent and evolution of paleo water masses. Variations in shale-normalized (subscript SN) Ce anomalies argue for variably oxidizing atmosphere/ocean conditions. The combination of REYSN systematics with carbonate associated P enrichments defines three distinct local water masses from which the carbonates precipitated: i) fully oxidized shallow-water, ii) nutrient-poor intra-shelf basin waters, and iii) organic carbon-rich slope and deep-waters with temporal evolution to higher dissolved pO2. Negative carbon isotope excursions in the carbonates such as during the putative Shuram equivalent Doushantuo Negative Carbon Excursion (DOUNCE) correlate with less negative CeSN anomalies and ambient seawater shifts to more radiogenic initial 87Sr/86Sr and 187Os/188Os, but unradiogenic 143Nd/144Nd compositions, arguing for coupling of redox and weathering trends. Our comprehensive geochemical study highlights the vertical and temporal variations of physicochemical water mass properties recorded in late Neoproterozoic Yangtze Platform carbonates until the emergence of the first metazoans.
Keywords
- C and P cycles, Carbonate osmium isotopes, Nutrient cycling, Shuram anomaly, Sr-Nd isotope stratigraphy, Yangtze Platform
ASJC Scopus subject areas
- Earth and Planetary Sciences(all)
- Oceanography
- Environmental Science(all)
- Global and Planetary Change
Sustainable Development Goals
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In: Global and planetary change, Vol. 216, 103927, 09.2022.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Spatiotemporal evolution of late Neoproterozoic marine environments on the Yangtze Platform (South China)
T2 - Linking continental weathering and marine C-P cycles
AU - Hohl, Simon V.
AU - Jiang, Shao Yong
AU - Becker, Harry
AU - Wei, Hai Zhen
AU - Wei, Guang Yi
AU - Xu, Juan
AU - Guo, Qingjun
AU - Viehmann, Sebastian
AU - van Acken, David
N1 - Funding information: SH acknowledges funding from the National Science Foundation of China (grant no: 4211101120). We thank W. Baro, M. Quiring, K. Neldner, S. Herzlieb for sample preparation; M. Feth, U. Wiechert, D. Hnatyshin for lab support and members of DFG-FOR 736 for field support. Finally we would like to thank Maoyan Zhu for editorial handling of the manuscript and three anonymous reviewers for their constructive comments that helped to significantly improve the quality of this manuscript. SH acknowledges funding from the National Science Foundation of China (grant no: 4211101120 ). We thank W. Bäro, M. Quiring, K. Neldner, S. Herzlieb for sample preparation; M. Feth, U. Wiechert, D. Hnatyshin for lab support and members of DFG-FOR 736 for field support. Finally we would like to thank Maoyan Zhu for editorial handling of the manuscript and three anonymous reviewers for their constructive comments that helped to significantly improve the quality of this manuscript.
PY - 2022/9
Y1 - 2022/9
N2 - The geodynamic reorganization of major cratonic blocks during the assembly of Gondwana in the late Neoproterozoic caused a (bio)geochemical evolution of marine habitats that witnessed fluctuating seawater oxygenation and nutrient fluxes. Previous studies of carbonates deposited on the Yangtze Platform (South China) have shown their use as reliable archives of paleo-redox and bio-productivity changes intrinsically linked to continental weathering fluxes and water mass cycling. Despite its complex submarine morphology, only a few carbonate-bearing sections comprising deeper depositional environments of the Yangtze Platform have been evaluated. Here we report temporal, lateral, and vertical variations of stable C and radiogenic Sr, Nd, and Os isotopic compositions together with trace element and rare earth and yttrium (REY) systematics in carbonates from the Doushantuo Formation representing different paleo-marine environments of the Yangtze Platform, including I) inner shelf, II) restricted intra-shelf basin, III) slope and IV) deep-water basin sections to trace the extent and evolution of paleo water masses. Variations in shale-normalized (subscript SN) Ce anomalies argue for variably oxidizing atmosphere/ocean conditions. The combination of REYSN systematics with carbonate associated P enrichments defines three distinct local water masses from which the carbonates precipitated: i) fully oxidized shallow-water, ii) nutrient-poor intra-shelf basin waters, and iii) organic carbon-rich slope and deep-waters with temporal evolution to higher dissolved pO2. Negative carbon isotope excursions in the carbonates such as during the putative Shuram equivalent Doushantuo Negative Carbon Excursion (DOUNCE) correlate with less negative CeSN anomalies and ambient seawater shifts to more radiogenic initial 87Sr/86Sr and 187Os/188Os, but unradiogenic 143Nd/144Nd compositions, arguing for coupling of redox and weathering trends. Our comprehensive geochemical study highlights the vertical and temporal variations of physicochemical water mass properties recorded in late Neoproterozoic Yangtze Platform carbonates until the emergence of the first metazoans.
AB - The geodynamic reorganization of major cratonic blocks during the assembly of Gondwana in the late Neoproterozoic caused a (bio)geochemical evolution of marine habitats that witnessed fluctuating seawater oxygenation and nutrient fluxes. Previous studies of carbonates deposited on the Yangtze Platform (South China) have shown their use as reliable archives of paleo-redox and bio-productivity changes intrinsically linked to continental weathering fluxes and water mass cycling. Despite its complex submarine morphology, only a few carbonate-bearing sections comprising deeper depositional environments of the Yangtze Platform have been evaluated. Here we report temporal, lateral, and vertical variations of stable C and radiogenic Sr, Nd, and Os isotopic compositions together with trace element and rare earth and yttrium (REY) systematics in carbonates from the Doushantuo Formation representing different paleo-marine environments of the Yangtze Platform, including I) inner shelf, II) restricted intra-shelf basin, III) slope and IV) deep-water basin sections to trace the extent and evolution of paleo water masses. Variations in shale-normalized (subscript SN) Ce anomalies argue for variably oxidizing atmosphere/ocean conditions. The combination of REYSN systematics with carbonate associated P enrichments defines three distinct local water masses from which the carbonates precipitated: i) fully oxidized shallow-water, ii) nutrient-poor intra-shelf basin waters, and iii) organic carbon-rich slope and deep-waters with temporal evolution to higher dissolved pO2. Negative carbon isotope excursions in the carbonates such as during the putative Shuram equivalent Doushantuo Negative Carbon Excursion (DOUNCE) correlate with less negative CeSN anomalies and ambient seawater shifts to more radiogenic initial 87Sr/86Sr and 187Os/188Os, but unradiogenic 143Nd/144Nd compositions, arguing for coupling of redox and weathering trends. Our comprehensive geochemical study highlights the vertical and temporal variations of physicochemical water mass properties recorded in late Neoproterozoic Yangtze Platform carbonates until the emergence of the first metazoans.
KW - C and P cycles
KW - Carbonate osmium isotopes
KW - Nutrient cycling
KW - Shuram anomaly
KW - Sr-Nd isotope stratigraphy
KW - Yangtze Platform
UR - http://www.scopus.com/inward/record.url?scp=85137037034&partnerID=8YFLogxK
U2 - 10.1016/j.gloplacha.2022.103927
DO - 10.1016/j.gloplacha.2022.103927
M3 - Article
AN - SCOPUS:85137037034
VL - 216
JO - Global and planetary change
JF - Global and planetary change
SN - 0921-8181
M1 - 103927
ER -