Evolution and stratigraphy of the Nakdong River valley deposits in response to late Quaternary sea-level change

2020 ◽  
Author(s):  
Dong-Geun Yoo ◽  
Seok-Hwi Hong ◽  
Gwang-Soo Lee ◽  
Jin-Cheul Kim ◽  
Gil-Young Kim ◽  
...  
Keyword(s):  
Sea Level ◽  
River Mouth ◽  
River Valley ◽  
Coarse Grained ◽  
Nakdong River ◽  
Delta Front ◽  
Delta Plain ◽  
Depositional System ◽  
Depositional Systems ◽  
The Nakdong River

<p>Sequence analysis using borehole samples and high-resolution seismic data in the Nakdong River valley reveals that the Nakdong River valley deposits, approximately 60 - 70 m thick, consist of a set of lowstand, transgressive, and highstand systems tracts that corresponds to a fifth-order (20 ka) sea-level cycle. Four main depositional systems, including ten sedimentary facies, constitute these systems tracts: fluvial, estuary, coastal/shoreface, and delta. The lowstand systems tract (LST), consisting of gravelly sand, forms a fluvial depositional system (Unit I) which fills the thalweg of river valley mainly developed approximately before 12 ka. The transgressive systems tract (TST) can be divided into two depositional systems (Unit II and III). The river-derived sediments were trapped within the paleo-estuary, forming an estuarine depositional system (Unit II) developed between 12 and 6 ka. As the transgression continued, the coarse sediments were deposited and redistributed by coastal processes, resulting in coastal/shoreface depositional system (Unit III). It is characterized by an isolated sand body and thin sand veneer. The HST is composed of deltaic depositional system including delta plain, delta front, and prodelta (Unit IV). During the delta progradation, most coarse-grained sands derived from the river were deposited in the lower delta plain and delta front, forming sand bars and shoals less than 15 m deep. The remaining fine-grained sediments were transported further offshore in a suspension mode and deposited in the inner shelf off the present river mouth, forming a subaqueous prodelta. Radiocarbon and optica<strong>lly stimulated luminescence (OSL</strong>) dating suggest that the recent deltaic system was initiated by aggradational and progradational stacking patterns at approximately 8 ka during the last stage of decelerated sea-level rise, and was then followed by a prograding clinoform after the highest sea level at approximately 6 ka.</p>

Stratigraphic evolution of the Nakdong River valley in response to late Quaternary sea-level changes

2020 ◽  
Vol 427 ◽  
pp. 106243
Author(s):  
Dong-Geun Yoo ◽  
Seok-Hwi Hong ◽  
Gwang-Soo Lee ◽  
Jin Cheul Kim ◽  
Hyun Ho Yoon ◽  
...  
Keyword(s):  
Sea Level ◽  
Late Quaternary ◽  
River Valley ◽  
Sea Level Changes ◽  
Nakdong River ◽  
The Nakdong River ◽  
Stratigraphic Evolution

scholarly journals Evolution of Depositional Environments in Response to the Holocene Sea-Level Change in the Lower Delta Plain of Nakdong River Delta, Korea

2021 ◽  
Vol 12 (1) ◽  
pp. 177
Author(s):  
Eun Je Jeong ◽  
Daekyo Cheong ◽  
Jin Cheul Kim ◽  
Hyoun Soo Lim ◽  
Seungwon Shin
Keyword(s):  
Grain Size ◽  
Sea Level ◽  
Depositional Environments ◽  
River Delta ◽  
Present Level ◽  
Nakdong River ◽  
Delta Front ◽  
Shallow Marine ◽  
Delta Plain ◽  
Drilling Site

The Nakdong River delta, located in southeastern Korea, preserves thick and wide sediments, which are suitable for the high-resolution study of the evolution of depositional environments in the lower delta plain area. This study traces the Holocene evolution of the Nakdong River delta using deep drill core (ND-3; 46.60 m thick) sediments from the present delta plain. Sedimentary units of the sediments were classified based on grain size compositions and sedimentary structures: (A) alluvial zone, (B) estuarine zone, (C) shallow marine, (D) prodelta, (E) delta front, and (F) delta plain. The weathered sediment, paleosol, was observed at 43.16 m below the surface. There is an unconformity (43.10 m) to separate a Pleistocene sediment layer in the lowermost part differentiating from a Holocene sediment layer in the upper part of the core. The shallow marine sedimentary unit (32.20~23.50 m), in which grain size decreases upward is overlain by the prodelta unit (23.50~15.10 m), which consists of fine-grained sediments and relatively homogeneous sedimentary facies. The boundary between the delta front unit (15.10~8.00 m) and the delta plain unit (8.00~0.00 m) appears to lie at 8.0 m, and the variation in grain size is different; coarsening upward in the delta front unit and fining upward in the delta front unit, respectively. These sediments are characterized by a lot of sand–mud couplets and mica flakes aligned along with cross-stratification, which may be deposited in relatively high-energy environments. Until 13 cal ka BP, the sea level was 70 m below the present level and the drilling site might be located onshore. At 10 cal ka BP, the sea level was located 50 m below the present level and the drilling site might be moved to an estuarine environment. From 8 to 6 cal ka BP, a transgression phase occurred as a result of coastline invasion by the rapid rise of the sea level. Thus, the drilling site was drowned in a shallow marine environment. After 6 cal ka BP, the sea level reached the present level, and, since then, progradation might begin to form, primarily by more sediment input. After this period, the progradation phase continues as the sediments have advanced and the delta grows.

Sediment properties of lithologic units and their correlation within the lower delta plain of the Nakdong River Delta, southeast Korea

2019 ◽  
Vol 519 ◽  
pp. 170-182
Author(s):  
Boo-Keun Khim ◽  
Seungwon Shin ◽  
Jin Cheul Kim ◽  
Hiroyuki Takata ◽  
Sangmin Hyun ◽  
...  
Keyword(s):  
River Delta ◽  
Nakdong River ◽  
Sediment Properties ◽  
Delta Plain ◽  
The Nakdong River

Delta Front Depositional System Study Based on Seismic Attributes and Well Logging Facies

2012 ◽  
Vol 170-173 ◽  
pp. 1285-1289 ◽  
Author(s):  
Xu Tao Li ◽  
Chang Song Lin
Keyword(s):  
River Mouth ◽  
Well Logging ◽  
Seismic Attributes ◽  
Delta Front ◽  
Seismic Attribute ◽  
The North ◽  
Depositional System ◽  
Sedimentary Microfacies ◽  
Mouth Bars ◽  
Bottom To Top

Along with analysis of logging facies characteristics of drilled wells, isometric strata slicing technique for seismic attribute is applied to interpret the distribution of the depositional systems in the study area. It is understood that Nenjiang3 Formation in Xinbei area of Xinli field consists of water regressive and sand progressive delta front depositional system from bottom to top. Combined with analogue analysis of well logging facies and planar seismic attributes, it is learned that sediments generally came from the north area, and main sedimentary microfacies include underwater distributary channels, river mouth bars, sheet sands body and interdistributary bays of delta front. With isometric slicing for the extraction of seismic attributes and logging operation, the distribution rules for sedimentary systems could analyzed, thereby providing a feasible method that could be referenced by the study on sedimentary system distribution of other areas.

scholarly journals The Palaeo-Kambaniru river mouth, Sumba, East Nusa Tenggara, Indonesia: A record of strongly seasonal catastrophic flow in a monsoon-controlled deltaic complex

2021 ◽  
Vol 47 (3) ◽  
pp. 65-72
Author(s):  
John-Paul Zonneveld ◽  
Yahdi Zaim ◽  
Yan Rizal ◽  
Aswan Aswan ◽  
Anne Fortuin ◽  
...  
Keyword(s):  
Coral Reef ◽  
River Mouth ◽  
Coarse Sand ◽  
Coarse Grained ◽  
Low Flow ◽  
Delta Front ◽  
Subsidence History ◽  
Study Interval ◽  
History Of ◽  
The City

The Kambaniru River valley near the city of Waingapu preserves a thick succession of coarse-grained fluvial-deltaic sediment deposited during the Late Pleistocene. This succession incises through a thick uplifted coral reef terrace succession and records intervals of highly episodic flow events during the last glacial interval. The occurrence of intraclastic, coarse sand/gravel matrix olistostromes in several areas attests to the occasionally catastrophic nature of flow in the ancestral Kambaniru River. Small to moderate-sized coral-rich reefs and laterally restricted reef terraces occur on delta-front conglomerate successions at multiple horizons through the study interval. These reefs record both intervals of low flow as well as periodic river-mouth avulsion episodes. Comparison of radiometric dates obtained from pelecypod and coral material from both deltaic successions and laterally adjacent coral reef terrace intervals indicates that uplift/subsidence history of the terraces differs from that of the valley and that correlation between the two should be taken with care.

scholarly journals Consideration of modern sendimentary processes of the Evros river delta front and prodelta, NE Aegean sea

2018 ◽  
Vol 34 (2) ◽  
pp. 709 ◽  
Author(s):  
Θ. Δ. ΚΑΝΕΛΛΟΠΟΥΛΟΣ ◽  
Β. ΚΑΨΙΜΑΛΗΣ ◽  
Μ. Ο. ΑΓΓΕΛΙΔΗΣ ◽  
Ε. ΚΑΜΠΕΡΗ ◽  
Α. ΚΑΡΑΓΕΩΡΓΗΣ
Keyword(s):  
Grain Size ◽  
Sedimentary Cover ◽  
River Mouth ◽  
River Delta ◽  
Coarse Grained ◽  
Delta Front ◽  
Long Distance ◽  
Sediment Distribution ◽  
Eastern Area ◽  
Evros River

Gravity cores data from the Evros River delta front and prodelta confirm the aspect that the Evros River deltaic deposits tend to west-northwest, along the main direction of the local hydrodynamic regime, preventing the construction of a symmetrical Holocene prism. In the delta front, the terrigenous sediment consists mostly of fine-grained material. Its vertical succession is monotonous with slight differences in grain size or colour, and lack of internal structure or current-produced laminae, indicating almost immutable sedimentary processes as well as long-term discharge fluctuations. The river-borne sand is limited because of its entrapment in the river mouth but sometimes, during extreme conditions (periods of high river discharge, short-lived catastrophic events etc.), can be transported seawards covering an extensive area of the Alexandroupolis Gulf. The negligible biogenic content and the absence of bioturbation effects are attributed to the high rates of deposition. Some bioturbated horizons are produced when sedimentation rates decrease temporarily. The prodelta sediment distribution patterns occur a distinctive zonation along an east-southeast to westnorthwest trend. In the central part, mud dominates, while on both sides of this area, the content of sand gradually increases and becomes the prevalent facies near the coast and in the outer plateau of the gulf. The vertical facies sequences of the upper sedimentary cover are complicated, with many variations in grain size, colour and biogenic content reflecting a complicated manner of deposition. The major feeder of this area is the Evros River providing great amounts of suspended load. Another remarkable source of sand is derived from the coastline, which during storm conditions provides coarse-grained material in the shoreface area. Finally, a sediment supplier of local importance, Loutros River, affects the eastern area of Alexandroupolis building up a small subaqueous fan. In the open sea, the consequences of the modern sedimentation are negligible. The sandy character of the surface and sub-surface sediments, the analysis of biogenic fragments, the long distance from the present-day terrigenous sources are some evidences which lead to the view that the upper sediment body of the southwestern part of the study area has a presumable relict origin. 210Pb profiles are, more of less, consistent showing a sedimentation rate more than 2 cm/yr in the delta front, which decreases to 0.2 cm/yr at about 8 km seaward.

DEFOSITIONAL FRAMEWORK AND DIAGENESIS OF THE LATE PERMIAN GAS RESERVOIRS OF THE BONAPARTE BASIN

1984 ◽  
Vol 24 (1) ◽  
pp. 299 ◽  
Author(s):  
M. R. Bhatia ◽  
M. Thomas ◽  
J. M. Boirie
Keyword(s):  
Clay Content ◽  
Coarse Grained ◽  
Reservoir Quality ◽  
Late Permian ◽  
Gas Reservoirs ◽  
Delta Front ◽  
Delta Plain ◽  
Porosity And Permeability ◽  
Calcite Cementation

Late Permian sandstones form the reservoir of the Tern and Petrel gas fields in the offshore Bonaparte Basin. The producing reservoirs of the Petrel field were deposited in various environments associated with a major northwesterly trending deltaic system. The producing sands in the Tern field were deposited in the shoreface environment of a barrier-bar system.The reservoir quality of the sands is controlled by the diagenesis, which is facies dependent. In the Petrel field, sandstones deposited in the upper delta plain and along the shoreline are clean, medium-to coarse-grained and highly quartzose but have very low porosity and permeability due to extensive quartz diagenesis. However, sands deposited in delta front and lower delta plain environments are medium to fine grained, argillaceous and have fair to good reservoir potential. In these sands, the dispersed clays formed coats and rims on quartz grains during early diagenesis and inhibited quartz overgrowth. In the Tern field, sands of the upper shoreface have poor reservoir quality due to early calcite cementation. However, finer-grained sandstones of the lower shoreface facies have good reservoir quality. The porosity in these sands is mainly primary and preserved due to low carbonate and high clay content. The processes of quartz and calcite cementation which drastically reduced the reservoir quality of the coarse-grained sands occurred early and were influenced by the texture of the sands and probably also by the chemical character of the formation waters.

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