Redox sensitivity of P cycling during marine black shale formation: Dynamics of sulfidic and anoxic, non-sulfidic bottom waters

März, Christian; Poulton, Simon W.; Beckmann, Britta; Küster, Kathrin; Wagner, Thomas; Kasten, Sabine

doi:10.1016/j.gca.2008.04.025

Cited by 216 publications

(148 citation statements)

References 87 publications

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“…Lower wind intensity also transported less dense particles with lower Zr/Al. Continuously high HI was linked to overall enhanced TOC preservation in persistently anoxic bottom water (22,42). Overall, the major climate control factor at this site seemed to be transitions between trade wind and river control on primary production and particle transport.…”

Section: Climate Context For the Xiamaling Formationmentioning

confidence: 87%

Orbital forcing of climate 1.4 billion years ago

Zhang

Wang

Hammarlund

et al. 2015

Proc. Natl. Acad. Sci. U.S.A.

125

126

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Fluctuating climate is a hallmark of Earth. As one transcends deep into Earth time, however, both the evidence for and the causes of climate change become difficult to establish. We report geochemical and sedimentological evidence for repeated, short-term climate fluctuations from the exceptionally well-preserved ∼1.4-billion-year-old Xiamaling Formation of the North China Craton. We observe two patterns of climate fluctuations: On long time scales, over what amounts to tens of millions of years, sediments of the Xiamaling Formation record changes in geochemistry consistent with long-term changes in the location of the Xiamaling relative to the position of the Intertropical Convergence Zone. On shorter time scales, and within a precisely calibrated stratigraphic framework, cyclicity in sediment geochemical dynamics is consistent with orbital control. In particular, sediment geochemical fluctuations reflect what appear to be orbitally forced changes in wind patterns and ocean circulation as they influenced rates of organic carbon flux, trace metal accumulation, and the source of detrital particles to the sediment.

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Section: Climate Context For the Xiamaling Formationmentioning

confidence: 87%

Orbital forcing of climate 1.4 billion years ago

Zhang

Wang

Hammarlund

et al. 2015

Proc. Natl. Acad. Sci. U.S.A.

125

126

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“…Closed system behavior may not occur in normal marine sediments but is certainly observed in some euxinic sediments. For example, Marz et al (2008) used the Poulton and Canfield (2005) Another important development has been to combine the use of the Fe geochemical indicators. Shen et al (2002) introduced the plot of Fe HR /FeT against DOP for Proterozoic black shales from the McArthur Basin.…”

Section: Recent Developmentsmentioning

confidence: 99%

The Iron Biogeochemical Cycle Past and Present

Raiswell¹,

Canfield²

2012

GeochemPersp

581

445

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“…To date, the Fe-speciation technique has been widely applied to shales and mudrocks, for which it was originally calibrated, and the technique has also been successfully applied to some carbonate-rich sediments (e.g., März et al, 2008; Kendall et al, 2012 abundance in order to consider Fe-enrichments independent of background (clastic) supply, and the ratio can be used in tandem with Fe-speciation to better understand Fe systematics.…”

Section: Fe-speciation In Carbonatesmentioning

confidence: 99%

“…To date, the Fe-speciation technique has been widely applied to shales and mudrocks, for which it was originally calibrated, and the technique has also been successfully applied to some carbonate-rich sediments (e.g., März et al, 2008;Kendall et al, 2012). Indeed, Clarkson et al (2014) recently demonstrated the utility of Fe-speciation for application to A c c e p t e d M a n u s c r i p t 17 appropriate carbonate-rich strata.…”

Section: Fe-speciation In Carbonatesmentioning

confidence: 99%

Dynamic redox conditions control late Ediacaran metazoan ecosystems in the Nama Group, Namibia

Wood

Poulton

Prave

et al. 2015

Precambrian Research

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172

194

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A c c e p t e d M a n u s c r i p t 3 ABSTRACTThe first appearance of skeletal metazoans in the late Ediacaran (~550 million years ago; Ma) has been linked to the widespread development of oxygenated oceanic conditions, but a precise spatial and temporal reconstruction of their evolution has not been resolved. Here we consider the evolution of ocean chemistry from ~550 to ~541 Ma across shelf-to-basin transects in the Zaris and Witputs Sub-Basins of the Nama Group, Namibia. New carbon isotope data capture the final stages of the Shuram/Wonoka deep negative C-isotope excursion, and these are complemented with a reconstruction of water column redox dynamics utilizing Fe-S-C systematics and the distribution of skeletal and soft-bodied metazoans. Combined, these inter-basinal datasets provide insight into the potential role of ocean redox chemistry during this pivotal interval of major biological innovation.The strongly negative  13 C values in the lower parts of the sections reflect both a secular, global change in the C-isotopic composition of Ediacaran seawater, as well as the influence of 'local' basinal effects as shown by the most negative  13 C values occurring in the transition from distal to proximal ramp settings. Critical, though, is that the transition to positive  13 C values postdates the appearance of calcified metazoans, indicating that the onset of biomineralization did not occur under post-excursion conditions. Significantly, we find that anoxic and ferruginous deeper water column conditions were prevalent during and after the transition to positive  13 C that marks the end of the Shuram/Wonoka excursion. Thus, if the C isotope trend reflects the transition to global-scale oxygenation in the aftermath of the oxidation of a large-scale, isotopically light organic carbon pool, it was not sufficient to fully oxygenate the deep ocean. Page 4 of 74A c c e p t e d M a n u s c r i p t 4 Both sub-basins reveal highly dynamic redox structures, where shallow, inner ramp settings experienced transient oxygenation. Anoxic conditions were caused either by episodic upwelling of deeper anoxic waters or higher rates of productivity. These settings supported short-lived and monospecific skeletal metazoan communities. By contrast, microbial (thrombolite) reefs, found in deeper inner-and mid-ramp settings, supported more biodiverse communities with complex ecologies and large skeletal metazoans. These long-lived reef communities, as well as Ediacaran soft-bodied biotas, are found particularly within transgressive systems, where oxygenation was persistent. We suggest that a mid-ramp position enabled physical ventilation mechanisms for shallow water column oxygenation to operate during flooding and transgressive sea-level rise. Our data support a prominent role for oxygen, and for stable oxygenated conditions in particular, in controlling both the distribution and ecology of Ediacaran skeletal metazoan communities.Keywords: Oxygenation; Neoproterozoic; Biomineralisation; Metazoans; Ediacaran; Ecosystems Introductio...

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Redox sensitivity of P cycling during marine black shale formation: Dynamics of sulfidic and anoxic, non-sulfidic bottom waters

Cited by 216 publications

References 87 publications

Orbital forcing of climate 1.4 billion years ago

Orbital forcing of climate 1.4 billion years ago

The Iron Biogeochemical Cycle Past and Present

Dynamic redox conditions control late Ediacaran metazoan ecosystems in the Nama Group, Namibia

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