Anoxia and fluctuating climate recorded from the Devonian–Carboniferous black shales, Tethys Himalaya, India: a multi-proxy approach

Ganai, Javid A.; Rashid, Shaik A.

doi:10.1007/s00531-019-01682-1

Cited by 11 publications

(8 citation statements)

References 80 publications

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“…It represents a key lithostratigraphic and biostratigraphic locality for the Devonian-Carboniferous boundary displaying Milankovich cyclicity, several regressions and transgressions, as well as extinction events as recorded by the Hangenberg and Lower Alum Shale Events (Becker, 1992(Becker, , 1999Korn et al 1994;Siegmund et al 2002;Kumpan et al 2015;. These two black shale intervals have been correlated globally to coeval strata in Spain, France and Poland, as well as to Hangenberg Event strata from India (Ganai & Rashid, 2019), Vietnam (Komatsu et al 2014), China (Zhang et al 2019), Morocco (Kaiser et al 2007), Italy (Spalletta et al 2021) and the USA (Lu et al 2019;Martinez et al 2019;Barnes et al 2020). Facies changes are recorded at Drewer starting with the latest Famennian nodular Wocklum Limestone and the calcareous, laminated Drewer Sandstone (Luppold et al 1994), followed by the Hangenberg Black Shale and intercalated Hangenberg Sandstone (Clausen et al 1989).…”

Section: B Upper Devonian To Mississippian Strata At Drewermentioning

confidence: 95%

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Chemotrophy-based phosphatic microstromatolites from the Mississippian at Drewer, Rhenish Massif, Germany

Zwicker,

Smrzka,

Gothieu

et al. 2023

Geol. Mag.

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The Drewer quarry located in the Rhenish Massif is a well-studied outcrop that comprises Upper Devonian (Famennian) to Lower Carboniferous (Viséan) strata. Within the Drewer deposits two black shale intervals have been described that are linked to two global oceanic anoxic events, the Hangenberg Event and the Lower Alum Shale Event. The black shales associated with the Middle Tournaisian Lower Alum Shale Event contain abundant phosphatic concretions, which were investigated using thin section petrography, powder X-ray diffraction, Fourier-transform infrared spectrometry and scanning electron microscopy. The concretions formed during several growth phases under anoxic and at least episodically sulphidic conditions within the sediment and served as a substrate for subsurface microbial mats that formed phosphatic microstromatolites. The microstromatolites occur either as partially branched columns of up to 600 µm in length attached to the phosphatic concretions or as smaller, bulbous aggregates surrounding the concretions. Element mapping identified the presence of pyrite and other metal sulphides within the phosphatic microstromatolites. The carbon and oxygen stable isotopic composition of phosphate-associated carbonate within the phosphatic microstromatolites suggests that the mat-forming microorganisms were probably anaerobic, chemotrophic microbial communities dwelling in the anoxic environment during the Lower Alum Shale Event. Such interpretation agrees with the deeper-water depositional setting of the Lower Alum Black Shale and its high content of organic matter, suggesting that chemotrophic microbial mats are potent agents of phosphogenesis in general, and of the formation of phosphatic stromatolites in particular.

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Section: B Upper Devonian To Mississippian Strata At Drewermentioning

confidence: 95%

“…2016). These two black shale intervals have been correlated globally to coeval strata in Spain, France and Poland, as well as to Hangenberg Event strata from India (Ganai & Rashid, 2019), Vietnam (Komatsu et al . 2014), China (Zhang et al .…”

Section: Geological Setting and Localitymentioning

confidence: 98%

Chemotrophy-based phosphatic microstromatolites from the Mississippian at Drewer, Rhenish Massif, Germany

Zwicker,

Smrzka,

Gothieu

et al. 2023

Geol. Mag.

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“…They further suggested that the Takche Formation also recorded pre-Hirnantian warming interval and an Hirnantian global cooling (Boda event). The geochemical studies carried out by Ganai et al (2016) and Ganai and Rashid (2019) suggested that varying Chemical Index of Alteration values (CIA) and -4Si% values corresponding to Lipak, Po and Ganmachidam formations of Spiti might have resulted due to varying weathering conditions in the provenance, i.e. warmer Devonian (more weathering), gradually becomes cooler during middle Carboniferous and finally leading to ice age during the Permo-Carboniferous interval.…”

Section: Singh Et Al (2016a) Precisely Demarcated Thementioning

confidence: 99%

“…The phosphatic nodules occurring in these black shales show enriched Y, Sr and REE abundances with high P 2 O 5 contents and MREE enrichments, with a "hat-shaped" pattern and subtle positive Ce-anomalies. The hat-shaped patterns are linked to the formation of authigenic apatite caused by microbial decomposition of organic matter (Ganai and Rashid, 2019). The δ 13 C values of the Lipak carbonates range from -8 to +2.6 ‰ and δ 18 O from -10-14.5%, the large shift in values may represent facies change associated with the regression (Ganai et al, 2016).…”

Section: Singh Et Al (2016a) Precisely Demarcated Thementioning

confidence: 99%

Contributions to the Palaeozoic and Mesozoic of the Himalaya

Bhargava¹,

Singh²,

Pandey³

et al. 2020

PINSA

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“…Research on black shales oftentimes relies on the use of chemical indices that serve as proxies for the physical-chemical conditions of ancient bodies of water (e.g., [11][12][13]). Different chemical indices are used as proxies for different parameters, including redox conditions [14][15][16], salinity [17] and hydrographic conditions [18].…”

Section: Introductionmentioning

confidence: 99%

Applying Statistical Analysis and Economics Models to Unscramble the Depositional Signals from Chemical Proxies in Black Shales

Goldberg,

Goldberg Da Rosa

2024

Geosciences

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The complex controls on the accumulation of organic-rich rocks remain elusive, despite their economic importance as source rocks and unconventional reservoirs, partially due to the multitude of factors that may impact production and preservation of organic matter in sediments. The complexity of Earth systems is comparable to the intricacies of Economics, and application of statistical and econometrics methods and models to analyze geological data may assist interpretation of the processes controlling organic burial. Chemical indices calculated for mudrock datasets from modern sediments and the Woodford Formation were used as proxies for detrital input, primary productivity, redox conditions, and upwelling, and a series of statistical analyses were run to test whether these methods were useful to discriminate different depositional conditions and establish the controls on total organic carbon (TOC) in the sediments. Model results showed that chemical proxies reliably predict not only TOC but also indicate correlations between indices. Our results suggest that detrital input, primary productivity and bottom-water anoxia are relevant drivers of organic content in the sediments, but the first two appear to have a more significant role in organic burial, illustrating the usefulness of these methods to assess depositional parameters in organic-rich rocks.

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Anoxia and fluctuating climate recorded from the Devonian–Carboniferous black shales, Tethys Himalaya, India: a multi-proxy approach

Cited by 11 publications

References 80 publications

Chemotrophy-based phosphatic microstromatolites from the Mississippian at Drewer, Rhenish Massif, Germany

Chemotrophy-based phosphatic microstromatolites from the Mississippian at Drewer, Rhenish Massif, Germany

Contributions to the Palaeozoic and Mesozoic of the Himalaya

Applying Statistical Analysis and Economics Models to Unscramble the Depositional Signals from Chemical Proxies in Black Shales

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