Multiple controls on the preservation of organic matter in Devonian–Mississippian marine black shales: geochemical and petrographic evidence

Rimmer, Susan M.; Thompson, Jennifer A.; Goodnight, Shane A.; Robl, Thomas L.

doi:10.1016/j.palaeo.2004.09.001

Cited by 79 publications

(79 citation statements)

References 63 publications

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“…Si/Al and Ti/Al ratios have been considered as proxies of detrital input in many previous studies (e.g., Bertrand et al 1996;Murphy et al 2000;Rimmer et al 2004;Sageman et al 2003;Werne et al 2002). Silica in marine sediments is of detrital origin or biogenic origin.…”

Section: Clastic Dilutionmentioning

confidence: 99%

“…Although these fine-grained rocks are common lithofacies of sedimentary rocks, they are the least understood (Schieber 1998;Wignall 1994). Black shales form in multiple and varied sedimentary environments (Stow et al 2001), and generally, preservation, organic productivity, and clastic dilution or sedimentary rate are the three main factors that cause black shale formation (e.g., Arthur 2005;Bohacs 2005;Rimmer et al 2004;Sageman et al 2003;Wang and Carr 2013). From the aspect of preservation, organic-rich shales accumulate as the result of favorable preservation in anoxic environments (Canfield 1989;Demaison and Moore 1980;Funnell 1987;Paropkari et al 1992;Wignall 1991;Woolnough 1937).…”

Section: Introductionmentioning

confidence: 99%

“…Previous studies ascertained the dominated control of only one of these three main factors (e.g., Demaison and Moore 1980;Tyson 1987;Wignall 1994). Recent studies, however, have proved that complex, multiple-control pathways most likely lead to accumulation of organic matter (e.g., Arthur 2005;Bohacs 2005;Rimmer et al 2004;Sageman et al 2003;Wang and Carr 2013).…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, some geochemical behaviors of trace elements in paleosea bottom water, such as barium, can be influenced by transformation of organic matter or biological growth, which is the indicator of paleoproductivity (McManus et al 1998;Pfeifer et al 2001). In addition, Si/Al and Ti/Al have been interpreted as indicative of detrital input, which is considered as proxy of clastic dilution (e.g., Rimmer et al 2004;Sageman et al 2003). In this research, samples of the Upper Ordovician Wufeng and the Lower Silurian Longmaxi shale from southeastern Chongqing (Fig.…”

Section: Introductionmentioning

confidence: 99%

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Impact of paleoenvironment, organic paleoproductivity, and clastic dilution on the formation of organic-rich shales: a case study about the Ordovician-Silurian black shales, southeastern Chongqing, South China

Tang

Zhang

et al. 2015

Arab J Geosci

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Three triggering factors, including preservation, organic paleoproductivity, and clastic dilution, for the formation of black shale successions during the Ordovician-Silurian transition have been debated for many years. Preserving conditions are controlled by redox conditions and microbial activities which have close relationship with salinity. Five outcrop sites of the Wufeng-Longmaxi black shales located in the southeastern area of Chongqing are analyzed for their elemental geochemistry, total organic carbon, and clay minerals. Clay minerals and boron are used to reconstruct the paleosalinity (S p ) of the bottom water during this period. Depending on the clay minerals' specific combining pattern, the calculation of S p is modified. The results show that the S p concentration ranges from 1.73 to 16.12‰, with an average value of 9.68‰. This shows an increasing trend from the Late Ordovician to the Early Silurian, indicating oligohaline-mesohaline water. Desalinization of the global ocean in the Late Ordovician was caused by melting of continental glaciers. The S p concentration shows negative correlation with total organic carbon (TOC) content, since the microbial decomposition rates are improved by high salinity. V/(V+Ni) and V/Cr ratios are used to reconstruct the paleoredox conditions of the bottom seawater during the Ordovician-Silurian transition, and the results suggest that the oxygen levels in seawater increased from the Late Ordovician to the Early Silurian and increased landward as a whole. Correlation between redox conditions with the TOC content reveals that anoxic conditions are favorable to the accumulation of organic matter. Ba and (Ba/Al) terr are used to calculate the biogenic Ba, in order to reconstruct organic paleoproductivity. The biogenic Ba shows no apparent relationship with the TOC content, which implies that organic paleoproductivity does not solely control the accumulation of organic matter. Si/Al and Ti/Al ratios are considered as indicators of clastic input. Our data imply that clastic input is quite low in the distal basin around the Ordovician-Silurian boundary, which is consistent with the maximum content of TOC. In the proximal basin, high clastic input dilutes enrichment of organic matter. We may conclude that complex, nonlinear interactions among the three factors most likely lead to the accumulation of organic matter. High preservation, low dilution, and low organic production lead to the formation of organic-rich shale, whereas low preservation, high dilution, and high organic production lead to organic-poor shale. Key PointsPaleoenvironment and organic paleoproductivity of the Yangtze Platform during the Late Ordovician and the Early Silurian are reconstructed.A combination of multiple factors significantly affects the formation of organic-rich shales.

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Section: Clastic Dilutionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Impact of paleoenvironment, organic paleoproductivity, and clastic dilution on the formation of organic-rich shales: a case study about the Ordovician-Silurian black shales, southeastern Chongqing, South China

Tang

Zhang

et al. 2015

Arab J Geosci

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“…For most of sedimentary deposition, aluminum can be considered as an indicator of the aluminosilicate fraction of the sediments, with very little ability to move during the diagenesis (Brumsack 1989;Calvert and Pedersen 1993;Morford and Emerson 1999;Piper and Perkins 2004). Though the method is commonly used for analyzing the paleoenvironmental condition of fine-grained siliciclastic sediments and sedimentary rocks relatively rich in OM, such as gray and black shales (e.g., Rimmer 2004;Rimmer et al 2004;Algeo and Maynard 2004;Tribovillard et al 2004a, b;Riquier et al 2005), recent studies have applied this method to carbonate rocks, especially Neoproterozoic cap carbonate (e.g., Font et al 2006;Nédélec et al 2007;Huang et al 2009Huang et al , 2012Meyer et al 2012).…”

Section: Al-normalized Trace Elementsmentioning

confidence: 99%

Trace element and REE geochemistry of the Ediacaran Doushantuo Formation from Fanjingshan area, northeast Guizhou province, China

Xiong

Wang

et al. 2014

Carbonates Evaporites

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Trace and rare earth elements (REEs) geochemistry of carbonate rocks of the Ediacaran Doushantuo Formation, northeast Guizhou province were studied to present spatio-temporal variations of trace elements and REEs from two suites of different sedimentary facies, so as to discuss simultaneously differing palaeo-environmental conditions during the deposition of Ediacaran carbonate formation. Results demonstrate that the depositional seawater of the Nongjing section is more oxygen-depleted than those of the Tongluo section during the early Doushantuo period. For the whole Doushantuo Formation, the sedimentary water column of the lower Doushantuo Formation is much more oxygen deficient than those of the upper, and is the most anoxic in the middle formation, which is consistent with sedimentary model of the Doushantuo Formation in this area. Relative to average marine carbonate, the depletion and enrichment of certain trace elements indicate that the sedimentary condition of the Doushantuo carbonates deposition was anoxic (the early)-oxic (the middle)-anoxic (the later), with more intensive volcanic and hydrothermal accompanying with lower palaeoproductivity. The North American shale compositenormalized REE ? Y patterns of Doushantuo carbonates from two sections are both characteristic of a slightly negative Ce anomaly, positive Eu anomaly and superchondritic Y/Ho ratio. Geochemical characteristics of trace elements and REEs reveal that these carbonates of the Doushantuo Formation formed generally in an alternant anoxic-oxic environment and a moderately stratified ocean with influx of high-temperature hydrothermal fluids and volcanic material. Different from the stepwise and protracted oxidation, an anoxic-oxic switching process of sedimentary water column with two episodic anoxic events had taken place, and would have contributed to a stimulus for increased evolution at that time.

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A kinetic model to explain the grain size and organic matter content dependence of magnetic susceptibility in transitional marine environments: A case study in Ria de Muros (NWIberia)

Mohamed

Andrade

Rey

et al. 2017

Geochem Geophys Geosyst

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Magnetic minerals in marine sediments are sensitive indicators of processes such as provenance changes, climatic controls, pollution, and postdepositional geochemical changes. Magnetic susceptibility is the bulk property of the sediments most commonly used to understand the magnetic characteristics of sediments. Before conclusions can be drawn from changes in this parameter, it is important to understand what factors and to what extent control changes in magnetic susceptibility. The magnetic susceptibility of surficial sediments in the Galician Rias Baixas, in NW Spain, has been shown to covary with sediment texture and organic matter content. Downcore, the magnetic properties of these sediments experience drastic changes as a result of strong dissolution caused by early diagenesis. In this paper, we further explore the relationship between these factors and formalize the observed covariations as the result of a simple second‐order kinetic model dependent on the content of organic matter in surficial sediments in the Ria de Muros. The reanalysis of previously reported data from the Rias de Vigo and Pontevedra confirmed the validity of this model and suggested further controls such as wave climate and water depth in the rates at which magnetic susceptibility changes are controlled by organic matter content.

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Multiple controls on the preservation of organic matter in Devonian–Mississippian marine black shales: geochemical and petrographic evidence

Cited by 79 publications

References 63 publications

Impact of paleoenvironment, organic paleoproductivity, and clastic dilution on the formation of organic-rich shales: a case study about the Ordovician-Silurian black shales, southeastern Chongqing, South China

Impact of paleoenvironment, organic paleoproductivity, and clastic dilution on the formation of organic-rich shales: a case study about the Ordovician-Silurian black shales, southeastern Chongqing, South China

Trace element and REE geochemistry of the Ediacaran Doushantuo Formation from Fanjingshan area, northeast Guizhou province, China

A kinetic model to explain the grain size and organic matter content dependence of magnetic susceptibility in transitional marine environments: A case study in Ria de Muros (NWIberia)

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