Experimental study on evolution of lacustrine shallow-water delta

Xin, Weiyan; Bai, Yuchuan; Xu, Haijue

doi:10.1016/j.catena.2019.104125

Cited by 14 publications

(5 citation statements)

References 25 publications

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“…6A and B. Complete mouth‐bars in front of shallow‐water deltas are rare because they are easily incised by distributary channels (Zhu et al ., 2017; Xin et al ., 2019; Cole et al ., 2021; Liu et al ., 2021; Figs 5A, B and 13A).…”

Section: Discussionmentioning

confidence: 99%

Evolution from shallow‐water deltas to fluvial fans in lacustrine basins: A case study from the Middle Jurassic Shaximiao Formation in the central Sichuan Basin, China

Yang,

Li,

Yang

et al. 2023

Sedimentology

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Distinguishing between shallow‐water delta and fluvial fan deposits in the subsurface of lacustrine basins is challenging due to their similar depositional characteristics and distribution patterns. This study focuses on the Middle Jurassic Shaximiao Formation in the central Sichuan Basin using core observations, seismic analyses, petrology analyses, zircon analyses, palaeoclimate indicators and palaeocurrent analyses to address this issue. Fifteen sedimentary lithofacies and eight lithofacies associations were established, corresponding to channelized fluvial deposits, non‐channelized fluvial deposits and shallow‐water delta deposits. Shallow‐water deltas are dominated by channels and mouth‐bar complexes with grey, red and green interbedded mudstone. Shingled seismic reflection, green mud clasts, small burrows and wave ripples are common with occasional palaeosols. Fluvial fans are dominated by channels and crevasse‐splays with pink colour and accompanied by red coloured floodplain deposits. Bright spot seismic reflection, red mud clasts, big burrows, current ripples and palaeosols are common. The increased uplift of the Dabashan Mountains controls the palaeocurrent direction, promoting the evolution from a shallow‐water delta in relatively humid environments to a fluvial fan in relatively arid environments. The channel widths in shallow‐water deltas are wider than those in fluvial fans, whereas the opposite applies for the channel amalgamation rate. Highly frequent channel‐width variations are controlled by short‐cycle climate fluctuation, corresponding to chemical index of alteration value fluctuations in different sandstone groups. The channel width in the relatively humid environments is wider than that in arid environments for both shallow‐water deltas and fluvial fans. It is likely that the sedimentary evolution from shallow‐water deltas to fluvial fans is relatively common in lacustrine basins in relatively arid environments with wide and gentle slope landforms.

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Section: Discussionmentioning

confidence: 99%

Evolution from shallow‐water deltas to fluvial fans in lacustrine basins: A case study from the Middle Jurassic Shaximiao Formation in the central Sichuan Basin, China

Yang,

Li,

Yang

et al. 2023

Sedimentology

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“…14 Then, a lot of researchers found that water depth is an important controlling factor for the development of shallow water deltas. 13,15,16 This article is licensed under CC-BY-NC-ND 4 Existing studies have shown that shallow water deltas have the following characteristics: the delta front is open, the sedimentary water is shallow, and it is often exposed to the surface. 8,17 According to Zhang et al's sedimentary research on modern Dongting Lake and Poyang Lake, shallow water deltas are divided into branch-shaped distributary channel deltas dominated by river and continuous distributary sand dam deltas dominated by lake current.…”

Section: ■ Introductionmentioning

confidence: 99%

“…In recent years, with the continuous development of oil and gas exploration and development in China’s continental basins, shallow water delta oil and gas reservoirs have been discovered in the Songliao Basin, Ordos Basin, and Bohai Bay Basin. Among them, river-controlled shallow water deltas dominated by rivers account for a large proportion. − Obviously, large shallow water delta reservoirs in the depression lake basin have made important contributions to the growth of China’s oil and gas reserves. , The remarkable achievements in oil and gas exploration in shallow water delta reservoirs have attracted wide attention from geologists, and a large number of studies have been carried out on the genesis and depositional patterns of shallow water deltas. − …”

Section: Introductionmentioning

confidence: 99%

Analysis of the Genetic Model of the Extremely Narrow Channel Shallow Water Delta in DL-A Oilfield, Bohai Bay Basin

Fan,

Kong,

et al. 2023

ACS Omega

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“…Several studies have shown that shifts in the deltaic sediment composition provide information about the paleo shoreline and large water-level variations that occur during extreme and prolonged desiccation events (Hyne et al 1979;Machlus et al 2000;Sáez et al 2018;Betancurth and Cañón 2021;Zhang et al 2021). However, deltaic sediments are rarely used for paleolimnological inferences because processes such as erosion, re-suspension, and posterior re-deposition of old material on top of more recent sediments make their interpretation difficult (Xin et al 2019).…”

Section: Introductionmentioning

confidence: 99%

Evidence of large water-level variations found in deltaic sediments of a tropical deep lake in the karst mountains of the Lacandon forest, Mexico

et al. 2022

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Lake Tzibaná is one of the largest (1.27 km2) and deepest (Zmax = 52 m) karstic lakes in the UNESCO’s Biosphere Reserve “Nahá-Metzabok” and in the Lacandon Forest, southeastern Mexico. It archives sediments from multiple sources and the inflowing Nahá River forms deltaic deposits. In 2019, the water level in Lake Tzibaná declined by ~ 15 m, persisting for 4 months and exposing the Nahá River Delta. A geophysical profile on the exposed delta revealed an accumulation of ~ 20 m of such deposits. Three sediment outcrops from an inactive channel in the Nahá River Delta, which ranged in height from 0.6 to 1.43 m, were sampled and a multi-proxy analysis of biological remains and geochemical variables was conducted. Four facies were observed: (1) massive-coarse sand, (2) fine sand, (3) dark leaf litter and (4) massive silty clay, each characterized by specific microcrustacean, testate amoebae and diatom taxa. Six dark leaf litter horizons were radiocarbon dated and revealed a complex depositional history including inverted ages making the establishment of an age model difficult. Nevertheless, past lake-level changes and the formation of the four facies match three characteristic water-level stages, which can also be observed on recent satellite images: (1) Massive-coarse sand deposits, with compositional and sedimentological characteristics of a shoreline environment and fluvial lateral banks, were formed during large-magnitude reductions in the lake level, similar to the one in 2019, (2) Interbedded layers of fine sand and dark leaf litter, currently found in low-energy fluvial environments, were formed during shorter and less pronounced decrease intervals, and (3) Massive silty clay, with distinctive microorganisms from low-energy lacustrine environments, is deposited during high water-level stages, when the delta is covered by water. Our findings illustrate how hydrological changes alter sedimentary dynamics in deltaic areas of lakes. Despite the complexity of their depositional processes, deltaic records can serve as a complementary source of paleolimnological information to records from distal zones due to their sensitivity to variations in water level, especially during extreme and prolonged desiccation events. Future research should attempt to combine evidences from deltaic and sediment sequences from deeper zones of Lake Tzibaná to reconstruct water-level variations during the entire Holocene. Understanding past lake-level reductions is not only relevant for the local indigenous communities but also crucial for the conservation of this ecosystem of international importance.

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Experimental study on evolution of lacustrine shallow-water delta

Cited by 14 publications

References 25 publications

Evolution from shallow‐water deltas to fluvial fans in lacustrine basins: A case study from the Middle Jurassic Shaximiao Formation in the central Sichuan Basin, China

Evolution from shallow‐water deltas to fluvial fans in lacustrine basins: A case study from the Middle Jurassic Shaximiao Formation in the central Sichuan Basin, China

Analysis of the Genetic Model of the Extremely Narrow Channel Shallow Water Delta in DL-A Oilfield, Bohai Bay Basin

Evidence of large water-level variations found in deltaic sediments of a tropical deep lake in the karst mountains of the Lacandon forest, Mexico

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