Shelf-margin architecture variability and its role in sediment-budget partitioning into deep-water areas

Gong, Chenglin; Steel, Ronald J.; Wang, Yingmin; Lin, Changsong; Olariu, Cornel

doi:10.1016/j.earscirev.2015.12.003

Cited by 67 publications

(40 citation statements)

References 50 publications

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“…(a) Modern topographic continental shelf margin of QDNB, SCS with the shelf edge location of T40, T30, T27, T20 and T0 (Gong et al, ; Ren et al, ; Shi et al, ; Sun et al, ; Zhao et al, , ). AA′, BB′ and CC′ mark the 3 illustrated seismic profiles out of a group of 28 parallel seismic lines available to this study.…”

Section: Geological Backgroundmentioning

confidence: 99%

“…(a) Northwest‐southeast orientated shelf slope seismic profile of QDNB shelf margin, SCS (see also Gong et al, ; Su et al, ; Sun et al, ; Zhang et al, ; Zhao et al, ; Zhao et al, ) (see the location AA′ in the base map Figure a). Y ‐axis is the TWTT (two‐way travel time in milliseconds).…”

Section: Geological Backgroundmentioning

confidence: 99%

“…The SCS margin was fed by a large drainage system with runoff greater than 0.43 m/year (Milliman & Farnsworth, 2011;Milliman & Syvitski, 1992;Syvitski & Milliman, 2007). The potential river sources for QDNB Margin are Ca River (suspended sediment (TSS) and dissolved-solid (TDS) F I G U R E 1 (a) Modern topographic continental shelf margin of QDNB, SCS with the shelf edge location of T40, T30, T27, T20 and T0 (Gong et al, 2016;Ren et al, 2014;Shi et al, 2013;Sun et al, 2015;Zhao et al, 2016Zhao et al, , 2015. AA′, BB′ and CC′ mark the 3 illustrated seismic profiles out of a group of 28 parallel seismic lines available to this study.…”

Section: Potential Sediment Supply To the Marginmentioning

confidence: 99%

“…Only three main seismic lines (Line AA′, BB′, CC′ in Figure 1a) are used in the discussions below and in the sediment flux calculation, because the method used is a 2D-based wave equation calculation giving a result for each of the seismic profiles. Petter, Steel, Mohrig, Kim, and Carvajal (2013) tested this method successfully with different numbers of laterally coeval seismic F I G U R E 2 (a) Northwest-southeast orientated shelf slope seismic profile of QDNB shelf margin, SCS (see also Gong et al, 2016;Su et al, 2014;Sun et al, 2015;Zhang et al, 2013;Zhao et al, 2016;Zhao et al, 2015) (see the location AA′ in the base map Figure 1a). Y-axis is the TWTT (two-way travel time in milliseconds).…”

Section: Seismic Databasementioning

confidence: 99%

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Clinoform growth and sediment flux into late Cenozoic Qiongdongnan shelf margin, South China Sea

et al. 2019

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The South China Sea continental margin in the Qiongdongnan Basin (QDNB) area has incrementally prograded since 10.5 Ma generating a margin sediment prism more than 4km‐thick and 150–200 km wide above the well‐dated T40 stratigraphic surface. Core and well log data, as well as clinoform morphology and growth patterns along 28 2D seismic reflection lines, illustrate the evolving architecture and margin morphology; through five main seismic‐stratigraphic surfaces (T40, T30, T27, T20 and T0) frame 15 clinothems in the southwest that reduce over some 200 km to 8 clinoforms in the northeast. The overall margin geometry shows a remarkable change from sigmoidal, strongly progradational and aggradational in the west to weakly progradational in the east. Vertical sediment accumulation rate increased significantly across the entire margin after 2.4 Ma, with a marked increase in mud content in the succession. Furthermore, an estimate of sediment flux across successive clinoforms on each of the three selected seismic cross sections indicate an overall decrease in sediment discharge west to east, away from the Red River depocenter, as well as a decrease in the percentage of total discharge crossing the shelf break in this same direction. The QDNB Late Cenozoic continental margin growth, with its overall increased sediment flux, responded to the climate‐induced, gradual cooling and falling global sea level during this icehouse period.

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Section: Geological Backgroundmentioning

confidence: 99%

Section: Geological Backgroundmentioning

confidence: 99%

Section: Potential Sediment Supply To the Marginmentioning

confidence: 99%

Section: Seismic Databasementioning

confidence: 99%

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Clinoform growth and sediment flux into late Cenozoic Qiongdongnan shelf margin, South China Sea

et al. 2019

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“…Consequently, they remain relatively understudied compared with their more sandstone-rich counterparts. Central issues regarding the development of mudstone-dominated deltaic systems include the process by which sediment is transported to the slope and basin (Nemec, 1995;Walsh & Nittrouer, 2009;Patruno et al, 2015b;Gong et al, 2016;Poyatos-Mor e et al, 2016) and to what extent fluctuations in relative sea-level or sediment supply are driving clinoform progradation (Blum & T€ ornqvist, 2000;Carvajal et al, 2009;Anell et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Clinoform development and topset evolution in a mud‐rich delta – the Middle Triassic Kobbe Formation, Norwegian Barents Sea

Klausen

Torland²,

Eide

et al. 2017

Sedimentology

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Clinoform surfaces are routinely used to mark transitions from shallow waters to deep basins. This concept represents a valuable tool for screening potential reservoir intervals in frontier basins where limited data are available. Variations in the character of clinoform geometries and shoreline and shelf‐edge trajectories are indicators of a range of different factors, such as palaeobathymetry, changes in relative sea‐level and sediment supply. Applications of conceptual and generalized models might, however, lead to erroneous assumptions about the supply of coarse‐grained material to the delta front and basin when superficial similarities between clinoform geometries are not treated holistically. The present study examines the mudstone‐dominated Middle Triassic Kobbe Formation – a potential hydrocarbon reservoir interval in the Barents Sea, where prodeltaic to deltaic deposits can be examined in cores, well logs and two‐dimensional and three‐dimensional seismic data. Despite pronounced acoustic impedance contrast to the surrounding shale, channel belt networks are not observed close to the platform edge in seismic datasets, even at maximum regressive stages. However, sub‐seismic prodeltaic deposits observed on the shallow platform indicate that prodeltaic deposits were sourced directly from the delta plain. Clinoform surfaces with different geometries and scale are observed basinward of the palaeoplatform edge of underlying progradational sequences, correlative to mudstone‐dominated prodeltaic core sections. Results indicate that platform‐edge deltas developed at discrete sites in the basin due to normal regression, but the positions of these deltas are not directly relatable to variations in clinoform geometries. Transitions from third‐order to fourth‐order clinoform geometries record discrete transgressive–regressive cycles but are not necessarily good indicators of sandstone deposition. Because of prolonged periods with high accommodation, channel avulsions were frequent and only very fine‐grained sandstone was deposited in heterolithic units at the delta front. Sandstones with good reservoir properties are predominantly found along basin margins.

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Tectonic and Climatic Controls on Asymmetric Half‐Graben Sedimentation: Inferences From 3‐D Numerical Modeling

et al. 2017

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The tectono‐sedimentary evolution of asymmetric extensional systems driven by the activity of major normal faults or detachments associated with footwall exhumation is often characterized by a sequence of slower, faster, and ultimately again slower subsidence rates in the center of hanging wall half‐grabens during their synkinematic and postkinematic evolution. We have studied this specific evolution by the means of 3‐D stratigraphic numerical modeling that accounts for the variability of the sediment and water flux combined with climatic and sea level variations, and sediment compaction. The model setup is constrained by observations from the Pannonian back‐arc basin of central Europe. Our modeling predicts the formation of low‐order tectonic and higher‐order sea level and climate‐driven transgressive‐regressive sedimentary cycles. Furthermore, we model and analyze the autocyclic nature of the depositional systems. Retrograding‐prograding cycles are visible on the proximal flank of the half‐grabens by their different spatial and temporal expressions, while depocenters record large water depth variations linked to the specific and episodic activity of normal faults and their migration with time. The application to a system of multiple half‐grabens in the Pannonian Basin, which are activated in different locations, at different times and with different kinematics, demonstrates a complex interplay between direct sediment sourcing and the sediments' ability to bypass trapping subbasins and paleo‐reliefs created by eroded footwalls.

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Shelf-margin architecture variability and its role in sediment-budget partitioning into deep-water areas

Cited by 67 publications

References 50 publications

Clinoform growth and sediment flux into late Cenozoic Qiongdongnan shelf margin, South China Sea

Clinoform growth and sediment flux into late Cenozoic Qiongdongnan shelf margin, South China Sea

Clinoform development and topset evolution in a mud‐rich delta – the Middle Triassic Kobbe Formation, Norwegian Barents Sea

Tectonic and Climatic Controls on Asymmetric Half‐Graben Sedimentation: Inferences From 3‐D Numerical Modeling

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