Geochemical composition of sediments in the Liao River Estuary and implications for provenance and weathering

Chi, Guangxi; Liu, Baolin; Hu, Ke; Yang, Juan; He, Bicheng

doi:10.1016/j.rsma.2021.101833

Cited by 5 publications

(2 citation statements)

References 56 publications

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“…CIA is defined as: CIA=[(Al 2 O 3 )/ (CaO*+Na 2 O+K 2 O+Al 2 O 3 )]×100 (in molecular proportions), where Cao* represents CaO associated with the silicate fraction of the sample. When Cao*<Na 2 O, Cao* is directly used; otherwise, Cao*=Na 2 O (McLennan et al, 1983;Oyebanjo et al, 2018;Chi et al, 2021). CIA of 50-60 indicates incipient weathering, CIA of 60-80 indicates intermediate weathering, and CIA >80 indicates extreme weathering (Fedo et al, 1995).…”

Section: Paleoweatheringmentioning

confidence: 99%

Paleoenvironmental reconstruction of the Eocene sediments in the Baiyun sag of the Pearl River Mouth Basin

Lei

Rahman

2023

Front. Earth Sci.

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The Baiyun sag of the Pearl River Mouth Basin has become a focus for deepwater exploration with the highest hydrocarbon potential in northern South China Sea. The Eocene organic-rich mudstones are the main source rocks in the Baiyun sag, and the evolution of their depositional environment remains unclear. Based on the core and geochemical data, we investigated the depositional environments of the Eocene Wenchang and Enping sediments in the Baiyuan sag and revealed the sedimentary environment influences on the formation of the source rocks in the study area. The results indicate that the sediments of the Wenchang and Enping formations were deposited in dysoxic to oxic environments. Moreover, according to the concentrations of salinity-sensitive trace elements, and δ13C (-10.9‰ to -7.2‰, average -8.58‰) and δ18O (-18.4‰ to -14.5‰, average -17.1‰) values of carbonate cement in the sandstone samples, the Wenchang and Enping formations were in fresh water to brackish water conditions during their deposition, with increasing salinity from bottom to top, which suggests that the two formations were mainly deposited in lacustrine environment and the Enping formation experienced a relatively extensive lake transgression. The vertical variations of geochemical characteristics suggest that the Wenchang and Enping formations were deposited under a semi-arid/warm condition and all Eocene sediments experienced mild to moderate chemical weathering, relatively large detrital input and stable paleowater depth. Both primary productivity and preservation conditions played essential roles in controlling the enrichment of organic matters in the Baiyun sag, and the preservation conditions resulted from the restricted water setting. The present work provide a comprehensive analysis of depositional environments based on the abundance of high-resolution geochemical data. The results obtained reveal the dominated factors controlling organic matter enrichment in the Baiyun Sag of the Pearl River Mouth Basin. Those findings are not only significant for understanding the region’s paleogeography, but also provide guidance for future profitable oil and gas exploration in the northern South China Sea and other similar areas.

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Section: Paleoweatheringmentioning

confidence: 99%

Paleoenvironmental reconstruction of the Eocene sediments in the Baiyun sag of the Pearl River Mouth Basin

Lei

Rahman

2023

Front. Earth Sci.

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“…Therefore, it may be reasonable to collect sediment cores from the Liao River estuary and study the historical contamination trend of OPEs. Meanwhile, the Liao River estuary is often used as a study site for historical sedimentary patterns of geochemical components (Zhang et al, 2018;Chi et al, 2021).…”

mentioning

confidence: 99%

Temporal trends of organophosphate esters in a sediment core from the tidal flat of Liao River estuary, Northeast China

Luo

Wang

et al. 2023

Front. Mar. Sci.

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The historical trends and inventory of organophosphate esters (OPEs) were investigated based on depth profiles of OPEs in sediment core collected from the tidal flat of the Liao River estuary in northeastern China. The concentration of ∑13OPEs in sediment core has increased continuously since records began, reaching a peak of 10.8 ng g-1 dry weight (dw) in the 1960s, then began to decline and fall to a low of 3.91 ng g-1 dw in the 1980s, before rising again and increasing to 20.4 ng g-1 dw in the 2000s. After a brief decline, It started to increase again and reached a peak of 27.0 ng g-1 dw in 2018. Tributyl-n-phosphate was found in each layer of the sediment core, accounting for 31.9 - 100% of ∑13OPEs. The fluxes of OPEs ranged from 46.5 to 105 ng cm-2 y-1 in the sediment layers deposited between 2007 and 2018. The inventory of OPEs in the sediment core was estimated to be 1541 ng cm-2. This work reports for the first time the historical contamination trends of OPEs in Chinese sediments, which is important for assessing the environmental risk of OPEs.

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Geochemical and Sedimentological Signatures of Ariyankuppam and Chunnambar Estuarine Sediments, Pondicherry, India: Implications on Weathering and Provenance

Kirubakaran,

Sridharan,

Nathan

et al. 2023

Journal of the Geological Society of India

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Thirty surface sediment samples collected from Ariyankuppam (N = 12) and Chunnambar estuaries (N = 18) located along the coast of Pondicherry, India, are analyzed to understand the nature of weathering and provenance. The granulometric study reveals that sediments are poorly sorted, positively skewed and platykurtic to leptokurtic in nature. The abundance and inverse relationship of SiO2 with other major oxides signify the detention of silica within quartz. The Index of Chemical Variability (ICV) suggests that sediments are compositionally immature and are derived from less weathered source rock. The weathering indices such as the Chemical Index of Alteration (CIA); Chemical Index of Weathering (CIW); Plagioclase Index of Alteration (PIA), and A-CN-K diagram also suggest less intense weathering of parent rocks. The major and trace element ratios viz. Al2O3/TiO2, TiO2/Zr, Cr/V and Y/Ni and discrimination diagrams indicate that estuarine sediment is derived from felsic and intermediate provenance.

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Geochemical composition of sediments in the Liao River Estuary and implications for provenance and weathering

Cited by 5 publications

References 56 publications

Paleoenvironmental reconstruction of the Eocene sediments in the Baiyun sag of the Pearl River Mouth Basin

Paleoenvironmental reconstruction of the Eocene sediments in the Baiyun sag of the Pearl River Mouth Basin

Temporal trends of organophosphate esters in a sediment core from the tidal flat of Liao River estuary, Northeast China

Geochemical and Sedimentological Signatures of Ariyankuppam and Chunnambar Estuarine Sediments, Pondicherry, India: Implications on Weathering and Provenance

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