Early Cenozoic paleontological assemblages and provenance evolution of the Lishui Sag, East China Sea

Jiang, Yiming; Liu, Zhenghua; Li, Shuai; Li, Ning; Liu, Jinshui; Qiao, Peijun; Zhong, Kai; Chen, Shuhui; Goh, Thian Lai

doi:10.1007/s13131-022-2133-y

Cited by 4 publications

(4 citation statements)

References 31 publications

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“…By contrast, in the middle Paleocene (62~61 Ma), transgression from the southeast transformed the restricted lacustrine environment into an open shallow marine environment. Widespread marine source rocks were deposited in this paleoenvironmental background (Figure 8b,c) [37,46]. Therefore, this study suggests that the Lishui Sag transitioned from a closed lake to an open-marine environment in the Paleocene (Figure 8a-c), which is consistent with the conclusion in the previous studies that there was an increase in global sea level accompanied by a gradual warming trend in the Earth's climate in the Paleocene [39,46,50,54].…”

Section: Gc and Gc-ms Analysis Resultssupporting

confidence: 87%

“…In the early period (66~61.6 Ma), the Lishui Sag was marked by an underfilled lake with a low material supply rate but a high subsidence rate, resulting in the occurrence of multiple isolated subsidence centers [41,48]. Some studies suggest that extensive magmatic activity occurred in the East China Sea from the Mesozoic to Early Cenozoic, contributing to the primary source of neutral or acidic magmatic rocks nearby for the Paleocene provenance of the Lishui Sag [37,46,81]. Volcanic activity increased salinity and enriched nutrient elements like Ca, Si, and Mg in the Lishui Sag [82,83].…”

Section: Accumulation Factors Of Organic Matter In a Saline Condition...mentioning

confidence: 99%

“…The fluctuating water inflow, along with an increase in In the late period (61.6~59.2 Ma), the subsidence rate was significantly lower than the sediment supply rate (namely a filled or overfilled basin) [38,41,46]. Zhang et al (2023) suggested simultaneous occurrences of foraminifera and dinoflagellates around 61 Ma, indicating the transition from lacustrine to marine facies in the lower member of Lingfeng Formation [37]. Despite the gradual warming and aridification of the climate during the lower member of Lingfeng Formation's depositional period, the continuous increase in terrestrial organic matter has led to a sustained, relatively high input of material supply (this aspect was discussed in Section 5.1).…”

Section: Accumulation Factors Of Organic Matter In a Saline Condition...mentioning

confidence: 99%

“…In the East China Sea, exploration efforts have predominantly centered on the Xihu and Lishui Sags in recent years because of their abundant natural gas and oil resources [33,34]. The previous studies suggest that the Lishui Sag holds the most potential for hydrocarbon exploration [34][35][36][37]. However, the paleoenvironmental evolution process and organic matter accumulation rule in the Paleogene remain controversial.…”

Section: Introductionmentioning

confidence: 99%

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Paleoenvironmental Evolution and Organic Matter Accumulation in a Hydrocarbon-Bearing Depression in the East China Sea

Zhan,

Liu,

Chen

et al. 2023

JMSE

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Investigating the paleoenvironment and characteristics of source rocks in sedimentary basins is crucial for understanding organic matter accumulation and guiding hydrocarbon exploration. The Lishui Sag, a significant hydrocarbon-bearing depression in the East China Sea, has experienced extensive marine transgression and increasing salinity in the Paleocene, but the changes in accumulation factors of organic matter during this evolution process remain unclear. Through a comprehensive analysis of total organic carbon (TOC), major and trace elements, and biomarker data, this study investigates the characteristics of source rocks from two lithostratigraphic units, namely the Paleocene Yueguifeng and Lingfeng formations, to gain deep insight into the effects of paleoenvironment on organic matter accumulation and hydrocarbon distribution. Our results indicate that the Lishui Sag transitioned from a closed lake to an open-marine environment in the Paleocene, with a shift from warm-humid to arid climate conditions. The biomarker distribution suggests a change in the origin of organic matter, with a higher input of terrestrial organic matter in the Lingfeng Formation. During the early stage, the lacustrine source rocks in the lower Yueguifeng Formation were formed in a relatively humid and anoxic environment within brackish water, resulting in a substantial influx of terrestrial and lacustrine algae organic matter. In contrast, in the late stage, the marine source rocks in the overlying Lingfeng Formation were developed in an arid and oxidizing environment. The lacustrine source rocks in the Yueguifeng Formation were notably more favorable to developing good-quality source rocks. Compared with the other regions, the western and northeastern parts of the study area have greater hydrocarbon generation potential due to the wider distribution of high maturity and organic-rich source rocks, with higher terrestrial and algal organic matter input. Moreover, considering the practical circumstances in the exploration, the northeastern part of the Lishui Sag is recommended as the next exploration target zone.

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Section: Gc and Gc-ms Analysis Resultssupporting

confidence: 87%

Section: Accumulation Factors Of Organic Matter In a Saline Condition...mentioning

confidence: 99%

Section: Accumulation Factors Of Organic Matter In a Saline Condition...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Paleoenvironmental Evolution and Organic Matter Accumulation in a Hydrocarbon-Bearing Depression in the East China Sea

Zhan,

Liu,

Chen

et al. 2023

JMSE

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Phosphorus speciation in wetland sediments of Zhujiang (Pearl) River Estuary, China

Wang

et al. 2013

Chin. Geogr. Sci.

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Phosphorus fractions and adsorption-release characteristics of sediments in the Zhujiang (Pearl) River estuary wetland were investigated. Results showed that the total phosphorus (TP) content in surface sediments ranged from 648.9 mg/kg to 1064.0 mg/kg; inorganic phosphorus (IP) was the major fraction of TP and ranged from 422.5 mg/kg to 643.9 mg/kg. Among the inorganic phosphorus, the main fractions were phosphorus bound to Al and Fe (Fe/Al-P), and calcium-bound phosphorus (Ca-P), accounting for 23%-42% and 21%-67% of IP, respectively. The vertical distribution of TP contents were significantly positive correlated with organic phosphorus (Org-P) and Fe/Al-P contents. The bio-available phosphorus contents in vertical sediments varied from 128.6 mg/kg to 442.9 mg/kg, mainly existed in Fe-Al/P fraction, and increased from the bottom to top sediments. The transport of phosphorus in sediment-water interface was controlled by the soil characteristics. The active Fe and Al content was considered as the main factor that determines adsorption capacity in vegetated marsh wetland. The P buffering capacity of the sediments in vegetated marsh wetland was greater than that in mudflat wetland. The potential risk of eutrophication in the study area is high. Reducing terrestrial phosphorus discharge and preventing the sediment Fe/Al-P release to the interstitial water are the possible solutions to reduce the risk of eutrophication in estuary wetlands, and planting vegetation in estuary wetland can also reduce the release of phosphorus in surface sediment.

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Effects of Smooth Cordgrass Spartina alterniflora Invasion on Macrobenthic Fauna in the Yellow River Delta

et al. 2022

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Early Cenozoic paleontological assemblages and provenance evolution of the Lishui Sag, East China Sea

Cited by 4 publications

References 31 publications

Paleoenvironmental Evolution and Organic Matter Accumulation in a Hydrocarbon-Bearing Depression in the East China Sea

Paleoenvironmental Evolution and Organic Matter Accumulation in a Hydrocarbon-Bearing Depression in the East China Sea

Phosphorus speciation in wetland sediments of Zhujiang (Pearl) River Estuary, China

Effects of Smooth Cordgrass Spartina alterniflora Invasion on Macrobenthic Fauna in the Yellow River Delta

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