Organic Carbon Deposition on the Inner Shelf of the East China Sea Constrained by Sea Level and Climatic Changes Since the Last Deglaciation

Zhang, Mingyu; Liu, Xiting; Xu, Fu-Liu; Li, Anchun; Gu, Yu; Chang, Xiaofeng; Zhuang, Guang‐Chao; Zhang, Kaidi; Bi, Naishuang; Wang, Houjie

doi:10.1007/s11802-023-5476-x

Cited by 7 publications

(4 citation statements)

References 96 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Recent studies have shown that rapid depositional events within the mud zone of the ECS inner shelf also favored the formation of closed diagenetic environments, and the migration of SMTZ has also been verified by multi-sulfur isotopes (Liu et al, 2019;Chang et al, 2020). Due to abundant terrestrial input and unstable sedimentary dynamics in the ECS shelf (Zhang et al, 2023), sedimentation rates vary significantly over different sites. The sedimentation rates at site YEC7-1 and YEC7-2 in this study are 0.86 cm yr -1 and 1.26 cm yr -1 (Figure 7), and they were indicated to be slightly higher than YS6 (Figure 8; Wang et al, 2013), but their minor difference should not account for their remarkable difference in SMI depth (Figure 6).…”

Section: Sedimentation Ratesmentioning

confidence: 99%

“…Intensified human activities have concerningly reduced sediment input and exacerbated coastal erosion, thinning the cap layer of shallow gas and enhancing leakages (Yang et al, 2011;Deng et al, 2017). The ECS continental shelf is a key area for studying both shallow gas and methane-related anaerobic processes, as evidenced by recent researches (Xu et al, 2018;Liu et al, 2020a;Zhang et al, 2021). Chen et al (2020) used high-resolution seismic exploration to map shallow gas distribution in the ECS's Holocene sediments, suggesting the thickness of Holocene mud wedge control the shallow gas distribution which is vulnerable to coastal erosion.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Response of early diagenesis to methane leakage in the inner shelf of the East China Sea

Wang,

Su,

Song

et al. 2024

Front. Mar. Sci.

View full text Add to dashboard Cite

Shelf seas are experiencing a rise in shallow gas leaks, primarily methane, raising concerns due to their environmental impact. However, the effect of the leaks on early diagenesis remains poorly understood. This study analyzes sediment lithology, organic geochemistry and porewater geochemistry of two short cores collected nearby the pockmarks in the muddy inner shelf of the East China Sea. Our findings clearly demonstrate the impact of methane leakage on early diagenesis, evidenced by the shallower position of the SMTZ (sulfate-methane transition zone), higher concentrations of uranium (U), vanadium (V), and manganese (Mn) in the porewater near and above the SMTZ, and downcore decrease in Mg2+, Ca2+, and Sr2+ concentrations versus increase in Mg2+/Ca2+ and Sr2+/Ca2+ ratios. Their profile variations and the difference between two cores are determined by the intensity of methane leakage. The estimated methane diffusive flux of 619 mmol m-2 yr-1 at YEC7–2 is roughly 8.5 times that at YEC7–1 (73 mmol m-2 yr-1), consistent with a shorter distance of YEC7–2 to the pockmark with active methane leakage. A schematic model is summarized to demonstrate the response of early diagenesis processes to the increasing methane leakages in response to changing sedimentation regimes from accretion to severe erosion. This study undoubtedly improves our understanding mutual promotion effect between seafloor erosion and gas leakage, and their impact on early diagenesis processes and resultant porewater geochemical changes and authigenic mineral records.

show abstract

Section: Sedimentation Ratesmentioning

confidence: 99%

mentioning

confidence: 99%

Response of early diagenesis to methane leakage in the inner shelf of the East China Sea

Wang,

Su,

Song

et al. 2024

Front. Mar. Sci.

View full text Add to dashboard Cite

show abstract

“…Controls on the fractionation of C isotopes and on TOC/TN ratios include early diagenesis, clay sorption, and sediment grain size. Finegrained minerals have a greater ability to adsorb OM owing to their larger specific surface area, and therefore TOC and TN contents are higher in fine-rather than coarse-grained sediments (Zhang et al, 2022). δ 13 C also vary according to grain-size fraction, and the stable isotope content of the fine-grained fraction is markedly higher than that of the coarse-grained fraction (Kienast et al, 2005).…”

Section: Provenance Of Sedimentary Organic Mattermentioning

confidence: 99%

“…Strong East Asian winter monsoon (EAWM) increases the depth of the mixed layer, thickens the thermocline and halocline, enhances vertical mixing of surface and subsurface seawater, and increases dissolved oxygen concentrations in the subsurface layer. Weak EAWM leads to shallower thermocline and halocline depth, weak vertical mixing and stronger stratification (Steinke et al, 2010;Zhang et al, 2022). The lack of large-scale upwelling in the northwestern SCS, where seawater stratification is common, suggests that it is possible that the variation in δ 15 N values in sediments of core G02 has been at least partly controlled by the upper water column stratification (Lin et al, 2010;Wu et al, 2017;Zhu et al, 2020;Wang et al, 2023a).…”

Section: Response Of Sedimentary δ 15 N Values To Lateral Intrusion O...mentioning

confidence: 99%

High-resolution record of temporal change in organic matter burial over the past ∼8,600 years on the northwestern continental slope of the South China Sea

Tong,

Chen,

Zhang

et al. 2023

Front. Earth Sci.

View full text Add to dashboard Cite

Sedimentary organic matter (SOM) on continental slopes in marine regions can sensitively record climatic and environmental changes. In this study, total organic carbon content (TOC), total nitrogen content (TN), and their stable isotope compositions (δ13C and δ15N) for sediments of core G02 were investigated (at ∼24.2-year resolution) to reveal the temporal variations in organic matter sources and the main controls on the sources and distribution of buried organic matter on the northwestern continental slope of the South China Sea over the last ∼8600 years. Results of a δ13C binary mixing model reveal that ∼82.3 ± 3% of SOM is derived from marine autochthonous sources. We suggest that the carbon and nitrogen contents and compositions of SOM are governed by distinct factors. The more positive δ15N values before the Pulleniatina Minimum Event occurrence are ascribed to stronger subsurface water intrusion by the Kuroshio Current, which led to enhanced subsurface denitrification and in turn counteracted the effect of mixing with surface water caused by the East Asian winter monsoon. Sedimentary δ13C values show a fluctuant decrease during ca. 8.6–3.0 cal kyr BP and a conspicuous increase during ca. 3.0–1.4 cal kyr BP. These changes are attributed to the decrease of marine productivity induced by the continuous weakening East Asian monsoon effect and the decrease of terrigenous organic carbon input induced by the weakened Indian summer monsoon precipitation, respectively. Since ca. 1.4 cal kyr BP, human activities have become the dominant factor in controlling the production and distribution of organic carbon. The results provide an important basis for understanding of source-sink processes of organic matter and the factors influencing these processes on continental slopes in low-latitude marginal seas.

show abstract

Dominant host phase of mercury within the sediments of the East China Sea inner shelf: Implications for mercury inputs

Chang,

Liu,

Zhang

et al. 2024

Chemical Geology

View full text Add to dashboard Cite

Organic Carbon Deposition on the Inner Shelf of the East China Sea Constrained by Sea Level and Climatic Changes Since the Last Deglaciation

Cited by 7 publications

References 96 publications

Response of early diagenesis to methane leakage in the inner shelf of the East China Sea

Response of early diagenesis to methane leakage in the inner shelf of the East China Sea

High-resolution record of temporal change in organic matter burial over the past ∼8,600 years on the northwestern continental slope of the South China Sea

Dominant host phase of mercury within the sediments of the East China Sea inner shelf: Implications for mercury inputs

Contact Info

Product

Resources

About