Depositional Environment of Sandy Tidal Flat in Anmyeondo, Western Coast of Korea

Trace fossil zonation in the Hartselle Sandstone of Mississippian age (Chesterian: Visean-Serpukhovian) exposed on Fielder Ridge, Alabama is compared with modern macro-tidal flat ichnocoenoses on the Bay of Fundy at Lubec, Maine, and demonstrated to be analogous by sedimentologic and ichnotaxonomic criteria. The modern flat has minimal influence from either waves or freshwater influx, and can be divided into five distinct ichnocoenoses, characterized by surface traces (epichnia) and four sedimentologic facies defined by gross grain texture or hydrodynamic characteristics, but lacking significant surface traces. Several characteristics of tidal flat deposits in a fetch-limited, marine (i.e., non-estuarine), meso- to macro-tidal regime can be used to recognize similar environments as old as the late Paleozoic. These criteria include (1) limited influence of wind and waves on the depositional environment, (2) lack of significant freshwater influence and therefore any persistent brackish environments, (3) a distinct spatial distribution of microenvironments defined by substrate and exposure period, (4) high diversity of epichnial traces directly associated with microenvironments across the tidal flat, (5) generally low degree of reworking of traces by bioturbation but high degree of reworking by tidal currents, and (6) preservation of traces of predation and scavenging behavior on an exposed surface. These features, together with the regional depositional pattern of the Hartselle Sandstone interpreted as tide-influenced bars and shoals, support a meso- to macro-tidal interpretation of the depositional environment.

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Ordovician deep dolomite reservoirs in the intracratonic Ordos Basin, China: Depositional model and Diagenetic evolution

Energy Exploration & Exploitation ◽

10.1177/0144598718778171 ◽

2018 ◽

Vol 36 (4) ◽

pp. 850-871 ◽

Cited By ~ 6

Author(s):

Anqing Chen ◽

Shenglin Xu ◽

Shuai Yang ◽

Hongde Chen ◽

Zhongtang Su ◽

...

Keyword(s):

Tidal Flat ◽

Depositional Environment ◽

Ordos Basin ◽

Depositional Model ◽

Facies Associations ◽

Intracratonic Basins ◽

Sea Level Fluctuation ◽

Reservoir Type ◽

Diagenetic Evolution

Recent natural gas discoveries indicate that non-karstification-dominated reservoirs exist in the intracratonic Ordos Basin. This study examines the sedimentological and geochemical characteristics needed to clarify the depositional model and diagenetic evolution process of this newly discovered reservoir type. The depositional environment of the dolomite reservoir can be characterized as a tidal flat that grew from the Central Paleo-uplift to the eastern depression by cyclic progradation on an epeiric platform. A tidal flat sequence can extend laterally as a progradational wedge in each cycle of sea level fluctuation. The sheet-shaped peritidal shoal facies associations patched on the wedge represent potential dolomite reservoirs and can be recognized by the presence of doloarenite that has been altered into a vaguely relict grained-texture by diagenesis. Although continuing destructive diagenesis has led to reservoir densification, burial dolomitization and burial dissolution with facies selectivity have tended to occur in peritidal shoal facies associations, thus improving the quality of the dolomite reservoirs. These models provide new insights for targeting deep dolomite hydrocarbon reservoirs in intracratonic basins.

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Analysis of Sedimentary Environment and Micro-Landform Changes After the Construction of Artificial Structures in the Tidal Flat of Anmyeondo Gagyeongju, Western Coast of Korea

JOURNAL OF THE KOREAN GEOMORPHOLOGICAL ASSOCIATION ◽

10.16968/jkga.25.1.31 ◽

2018 ◽

Vol 25 (1) ◽

pp. 31-45

Author(s):

Dong-Ho JANG ◽

Ju-Hyun Ryu

Keyword(s):

Tidal Flat ◽

Sedimentary Environment ◽

Western Coast ◽

Artificial Structures

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Determination of sedimentation rate of a recently deposited tidal flat, western coast of Korea, using IRSL dating

Quaternary Science Reviews ◽

10.1016/s0277-3791(03)00012-x ◽

2003 ◽

Vol 22 (10-13) ◽

pp. 1185-1189 ◽

Cited By ~ 13

Author(s):

Duk-Geun Hong ◽

Man Sik Choi ◽

Jeong-Hee Han ◽

Chang-Sik Cheong

Keyword(s):

Sedimentation Rate ◽

Tidal Flat ◽

Western Coast

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Palaeoenvironment, sequence stratigraphy and palaeogeography of the Lower Cretaceous deposits of Mehdi Abad, Yazd Block, Central Iran

Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen ◽

10.1127/njgpa/2020/0868 ◽

2020 ◽

Vol 295 (1) ◽

pp. 61-89

Author(s):

Mohammad Safaei ◽

Asadollah Mahboubi ◽

Soroush Modabberi ◽

Reza Moussavi-Harami

Keyword(s):

Sequence Stratigraphy ◽

Coastal Plain ◽

Tidal Flat ◽

Lower Cretaceous ◽

Depositional Environment ◽

Carbonate Platform ◽

Depositional Environments ◽

Sea Level Changes ◽

Deep Basin

Four Lower Cretaceous sections in the southern Yazd Block were measured and studied to interpret the palaeoenvironments, synsedimentary tectonics, and sequence stratigraphy. The Early Cretaceous sedimentary record of this block, consisting of the Sangestan, Taft, Abkuh, and Darreh Zanjir formations, was mainly influenced by synsedimentary tectonic activities in a tectonically unstable basin. Field observations and laboratory studies were used to identify lithofacies and microfacies, based on which six depositional environments were identified: upper coastal plain (alluvial fans), shore, tidal flat, lagoon, shoal, and open marine. A carbonate-siliciclastic shallow platform including an alluvial-coastal plain and an inner platform is suggested for the depositional environment of the Sangestan Formation. The depth of the overall shallow sedimentary basin of Sangestan Formation increases from west to east and deposition was controlled by long- term sea-level changes. A carbonate platform consisting of inner and outer parts, including tidal flat, lagoon, open marine belts, is suggested for the depositional environment of the Taft and Abkuh formations, while the Darreh Zanjir Formation accumulated in a deep basin. The predominant facies demonstrate an overall transgression-regression cycle (the 2rd order cycle) during the depositional time of these formations in the southern Yazd Block.

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Sedimentology of the Dinantian of Foulden, Berwickshire, Scotland

Transactions of the Royal Society of Edinburgh Earth Sciences ◽

10.1017/s0263593300010233 ◽

1985 ◽

Vol 76 (1) ◽

pp. 7-12 ◽

Cited By ~ 19

Author(s):

R. Anderton

Keyword(s):

Water Chemistry ◽

Coastal Plain ◽

Tidal Flat ◽

Depositional Environment ◽

Alluvial Plain ◽

Plant Debris ◽

Meandering Rivers ◽

Dry Spells ◽

Saline Waters ◽

Crevasse Splay

ABSTRACTThe Berwickshire Cementstone Group was deposited on a coastal plain crossed by meandering rivers flowing S into a marine gulf, the Northumberland basin. Sedimentation was mainly by overbank flooding onto an alluvial plain which largely dried out between floods. The resulting sediments include poorly-stratified mudstones and siltstones and crevasse splay sheet sandstones. The depositional environment of the cementstones is not clear. Lacustrine and tidal flat origins are considered. Semi-permanent floodplain lakes were very rare, but in one the uniquely fossiliferous Foulden Fish Bed was deposited. This lake was shallow and filled by repeated influxes of sediment carried from rivers by sheetfloods. On entering the lake, these sheetfloods may have become density underflows from which thin, graded siltstones or sandstones were deposited. These floods carried plant debris into the lake and rapidly buried the remains of the lake fauna. The salinity of the lake cannot be determined, but the input of both fresh and saline waters can be envisaged. There is no evidence that the lake was permanently eutrophic. The mortality of the animals may have been due to changes in water chemistry produced by hot dry spells of weather followed by storms and floods.

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