The Toarcian Oceanic Anoxic Event in a shelf environment (Eastern Tethys): Implications for weathering and redox conditions

Nie, Ying; Fu, Xiugen; Liang, Jintong; Wei, Hengye; Chen, None Zheng'an; Lin, Fei; Zeng, Shengqiang; Wu, Yajuan; Zeng, Yi; Mansour, Ahmed

doi:10.1016/j.sedgeo.2023.106476

Cited by 8 publications

(6 citation statements)

References 141 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

Section: Terrigenous Debris Influx and Primary Productivitymentioning

confidence: 99%

“…Certain lithogenic elements, including Al, Si, Ti, and Zr, serve as robust proxies of terrigenous debris influx [51,52]. Zr is commonly associated with the heavy mineral zircon, while Al is primarily found in clay mineral fractions.…”

Section: Terrigenous Debris Influx and Primary Productivitymentioning

confidence: 99%

“…Consequently, ratios such as Si/Al, Zr/Al, and Ti/Al can provide insights into the clastic sediment component. An elevation in Zr/Al and Ti/Al ratios signifies increased eolian detrital input, while an increase in Si/Al ratio reflects enhanced fluvial delivery of clastic material [52,53]. The distribution ranges for the Si/Al, Zr/Al, and Ti/Al ratios within the Dongyuemiao shale are 2.10 to 3.12 (average = 2.61), 5.5 × 10 −4 to 10.0 × 10 −4 (average = 7.6 × 10 −4 ), and 0.043 to 0.063 (average = 0.055), respectively.…”

Section: Terrigenous Debris Influx and Primary Productivitymentioning

confidence: 99%

“…This observation further supports the inference of relatively low primary productivity in the Dongyuemiao shale. Cu, Ni, and Zn contents serve as indicators to assess primary productivity patterns [42,52,54]. These elements are essential micro-nutrients participating in biological metabolism, and they are transported to sediments in conjunction with sedimentary OM in the form of organometallic complexes [52,54].…”

Section: Terrigenous Debris Influx and Primary Productivitymentioning

confidence: 99%

“…Cu, Ni, and Zn contents serve as indicators to assess primary productivity patterns [42,52,54]. These elements are essential micro-nutrients participating in biological metabolism, and they are transported to sediments in conjunction with sedimentary OM in the form of organometallic complexes [52,54]. To eliminate the impact of terrigenous debris influx, we employ the Al-normalized Ni, Cu, and Zn values of the Dongyuemiao shale to characterize primary productivity levels.…”

Section: Terrigenous Debris Influx and Primary Productivitymentioning

confidence: 99%

See 4 more Smart Citations

Geological Features, Paleosedimentary Environment, and Organic Matter Accumulation Mechanisms of the Lacustrine Shale Oil System: A Case Study of the Jurassic Dongyuemiao Member in the Sichuan Basin

Wang,

Li,

Guo

et al. 2023

Processes

View full text Add to dashboard Cite

Lacustrine shale has garnered significant attention due to its significant resource potential. The Jurassic shale in the Sichuan Basin is an important target for lacustrine shale exploration in China. However, previous studies have predominantly focused on the Da’anzhai member of the Ziliujing Formation, and little attention has been paid to the shale of other strata. This paper aims to address this gap by investigating the Jurassic Dongyuemiao member in the Sichuan Basin. The study systematically characterizes the geological properties of the Dongyuemiao shale system, reconstructs the paleosedimentary environment, identifies the key factors influencing organic matter (OM) enrichment and physical properties, and assesses its resource potential through comparative analysis. Our results show that the Dongyuemiao shale was deposited in an oxic and semi-humid sedimentary environment characterized by intense weathering conditions. The enrichment of OM in the shale is primarily controlled by redox conditions and salinity, with redox conditions playing the most crucial role in OM accumulation. In terms of pore system characterization, clay mineral-associated pores dominate the pore types in the Dongyuemiao shale, while two types of organic matter-associated pores are also widely observed. The development of framework grain-associated pores is limited and only present in certain siliceous and carbonate minerals. The shales of the Dongyuemiao member and the Da’anzhai member exhibit slight differences in TOC content. However, the kerogen in the Dongyuemiao member displays higher hydrocarbon generation potential, and the Dongyuemiao shale exhibits more favorable pore structure parameters. Overall, the Dongyuemiao shale does not exhibit any significant disadvantages compared to the Da’anzhai shale. Therefore, it deserves greater attention in future exploration endeavors. The research findings presented in this paper provide a solid theoretical foundation for expanding the exploration scope of lacustrine shale in the Sichuan Basin.

show abstract

Section: Terrigenous Debris Influx and Primary Productivitymentioning

confidence: 99%

Section: Terrigenous Debris Influx and Primary Productivitymentioning

confidence: 99%

Section: Terrigenous Debris Influx and Primary Productivitymentioning

confidence: 99%

Section: Terrigenous Debris Influx and Primary Productivitymentioning

confidence: 99%

Section: Terrigenous Debris Influx and Primary Productivitymentioning

confidence: 99%

See 3 more Smart Citations

Geological Features, Paleosedimentary Environment, and Organic Matter Accumulation Mechanisms of the Lacustrine Shale Oil System: A Case Study of the Jurassic Dongyuemiao Member in the Sichuan Basin

Wang,

Li,

Guo

et al. 2023

Processes

View full text Add to dashboard Cite

show abstract

Multi‐Parameter Investigation of Cretaceous to Palaeocene Sedimentary Sequences in the Anambra and Niger Delta Basins, Nigeria: Organic Matter Characterisation, Palynofacies and Implications for Palaeoclimate and Sea‐Level Changes

Omietimi,

Lenhardt,

Yang

et al. 2024

Geological Journal

View full text Add to dashboard Cite

The Anambra Basin of Nigeria, part of the larger West and Central African Rift System (WCARS) across Africa, contains primarily Cretaceous to Palaeocene shallow to marginal marine and freshwater sedimentary deposits. The organic‐rich deposits of the Cretaceous Nkporo and Mamu formations within the Anambra Basin and the Palaeocene Imo Formation of the Niger Delta Basin constitute important conventional source rocks. Despite its economic significance, research on organic matter characterisation, palynofacies, sea‐level fluctuations, palaeoclimate, hydrogeography, basin restriction, palaeobathymetry and the factors controlling organic matter preservation remains largely undocumented. The here presented new inorganic and organic geochemical and organic petrography data of the Cretaceous to Palaeocene deposits serve to refine the regional interpretation at a basinal scale and within the supra‐regional context of the WCARS. Geochemical palaeotemperature proxies suggest a warm and humid tropical palaeoclimate during the Late Cretaceous within the study area. Furthermore, the measured TOC values indicate poor to very good organic content. Palynofacies analysis revealed high abundances of opaque and translucent phytoclasts and low amounts of palynomorphs with negligible amorphous organic matter (AOM) in the studied mudrocks. Two palynofacies groups suggest shallow‐marine conditions in a proximal shelf setting and a heterolithic oxic basin. The palynofacies of the upper Imo Formation reveal higher percentages of dinoflagellate cysts during the early highstand phase, with equidimensional, opaque phytoclasts representing the maximum flooding phase, accompanied by warmer conditions. Additionally, abundant terrestrial phytoclasts, Deltoidospora spp., Classopollis spp. and geochemical indicators collectively indicate warm tropical climatic conditions consistent with geochemical interpretations. The palaeobathymetry reconstructions suggest a shallow seaway during the Upper Cretaceous in the Anambra Basin.

show abstract

Global hydroclimate perturbations during the Toarcian oceanic anoxic event

Kemp,

Han,

et al. 2024

Earth-Science Reviews

View full text Add to dashboard Cite

The Toarcian Oceanic Anoxic Event in a shelf environment (Eastern Tethys): Implications for weathering and redox conditions

Cited by 8 publications

References 141 publications

Geological Features, Paleosedimentary Environment, and Organic Matter Accumulation Mechanisms of the Lacustrine Shale Oil System: A Case Study of the Jurassic Dongyuemiao Member in the Sichuan Basin

Geological Features, Paleosedimentary Environment, and Organic Matter Accumulation Mechanisms of the Lacustrine Shale Oil System: A Case Study of the Jurassic Dongyuemiao Member in the Sichuan Basin

Multi‐Parameter Investigation of Cretaceous to Palaeocene Sedimentary Sequences in the Anambra and Niger Delta Basins, Nigeria: Organic Matter Characterisation, Palynofacies and Implications for Palaeoclimate and Sea‐Level Changes

Global hydroclimate perturbations during the Toarcian oceanic anoxic event

Contact Info

Product

Resources

About