Benthic foraminiferal fauna and sediment provenance of Eocene syn-rift sequences in Taiwan: implication for onset of Asian epi-continental marginal seas off China coast

Age of breakup unconformity of Palawan microcontinent block (33-32 Ma) demonstrate its conjugate relationship with Pearl River Mouth Basin • Both interior Cathaysia block and local basement uplifts supplied syn-rift sediments to central-southern Palawan on the continental slope • Sediment routing on the South China margin imply a wide rifted margin with very low topographic gradient before seafloor spreading

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“…The inferred Middle Eocene coastline is mainly based on Huang et al. (2019), Q. Y. Li et al. (2017) and Yao et al.…”

Section: Discussionmentioning

confidence: 99%

Stratigraphy and Provenance of the Paleogene Syn‐Rift Sediments in Central‐Southern Palawan: Paleogeographic Significance for the South China Margin

et al. 2021

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“…3). The species characteristics were similar to those of Eocene synrift sediments in Taiwan (Huang et al, 2018;Jian et al, 2019), and the sedimentary environment was a shallow shelf environment that exhibited the expansion process of the marine environment from east to west. The IODP site U1435A also revealed that the Upper Eocene was a 280 m thick littoral-delta deposit (Shao et al, 2017c), indicating that marine deposits occurred in the Late Eocene in the eastern deep-water area of the northern SCS.…”

Section: Cenozoic Sea-land Transition and Sedimentary Environment Evomentioning

confidence: 65%

Cenozoic Sea‐land Transition and its Petroleum Geological Significance in the Northern South China Sea

Zhao¹,

Zhang

Cui

et al. 2021

Acta Geologica Sinica (Eng)

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The process of Cenozoic sea-land changes in the northern South China Sea (SCS) controlled the sedimentary filling pattern and played an important role in the petroleum geological characteristics of the northern marginal sedimentary basins. Under the control of the opening process of the SCS, the northern SCS Cenozoic transgression generally showed the characteristics of early in the east and late in the west, and early in the south and late in the north. The initial transgression occurred in the Eocene in the Taixinan Basin (TXNB) of the eastern SCS, while the transgression occurred until the Pliocene in the Yinggehai Basin (YGHB) of the western SCS. International Ocean Discovery Program (IODP) expeditions (Expeditions 367/368) revealed that the initial transgression of the SCS basin occurred at approximately 34 Ma, which was the initial opening time of the SCS. The period of drastic changes in the sedimentary environment caused by large-scale transgression corresponded to the opening time of the southwestern subbasin (approximately 23 Ma), which also represented the peak of the spreading of the SCS. The sea-land transition process controls the distribution of alternating continent-marine facies, marine facies source rocks and reservoirs in the basins. The marine facies source rocks of the basins in the northern SCS have a trend of gradually becoming younger from east to west, which is consistent with the regional process of gradual transgression from east to west. Regional sea-level changes were comprehensively influenced by SCS opening and global sea-level changes. These processes led to the early development in the east and south and late development in the west and north for the carbonate platform in the SCS. Carbonate platforms form another type of "selfgenerating and self-accumulating" oil-gas reservoir in the northern SCS. The sea-land transition controlled the depositional filling patterns of different basins and laid the foundation of marine deposits for oil and gas resources. The source-reservoircap assemblage in the northern SCS was controlled horizontally by provenance supply and sedimentary environmental changes caused by sea-land transition and vertically by the tectonic evolution of the SCS and regional sea-level changes.

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“…Among them, two papers focus on the northern margin of the SCS, and the other two on the southern SCS. Huang et al (2018) examine the onset of Asian epi-continental marginal sea by the integration of both paleontology and sedimentology evidence from the Eocene sequences exposed on Taiwan Island. This research provides new constraints for evolution in the eastern margin of the SCS.…”

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confidence: 99%

Preface to the special issue “Tectonics and depositional infilling of western Pacific marginal sea”

2019

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Benthic foraminiferal fauna and sediment provenance of Eocene syn-rift sequences in Taiwan: implication for onset of Asian epi-continental marginal seas off China coast

Cited by 5 publications

References 24 publications

Stratigraphy and Provenance of the Paleogene Syn‐Rift Sediments in Central‐Southern Palawan: Paleogeographic Significance for the South China Margin

Stratigraphy and Provenance of the Paleogene Syn‐Rift Sediments in Central‐Southern Palawan: Paleogeographic Significance for the South China Margin

Cenozoic Sea‐land Transition and its Petroleum Geological Significance in the Northern South China Sea

Preface to the special issue “Tectonics and depositional infilling of western Pacific marginal sea”

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