Carbonate platform

However, southern hemisphere records of Toarcian carbonate platforms are rare, and thus the extent and significance of biotic platform demise during the T-OAE is unclear. Here we present high-resolution geochemical and sedimentological data across two Pliensbachian–Toarcian shallow-water carbonate-platform sections exposed in the …

China's Paleozoic deep carbonate effective reservoirs, mainly non-porous reservoirs, are generally formed under the interaction of late diagenesis, hydrothermal fluids, and structural fractures. Faults and their deformation mechanism and internal structure of fault zones play an important role in the formation of carbonate reservoirs and hydrocarbon accumulation. Based on the detailed ...The carbonate influence is greater in the clay minerals facies than in the quartzous facies because of the mixing of terrigenous mud (relict or modern) with modern bioclastic sedimentation. This mixed carbonate-siliciclastic system is observed throughout the semi-arid shelf of the Brazilian equatorial margin (Piauí to Rio Grande do Norte shelf).Carbonate platforms usually keep pace with subsidence and sea level rise but “platform drowning” occurs when carbonate sedimentation slows or when siliciclastics replace carbonates. Identifying specific mechanism(s) behind platform drowning is critical for understanding global environmental changes such as Ocean Anoxic Events (OAEs). ...During the E-C transition, the Yangtze Block evolved from a rift basin to a passive continental margin basin (Wang and Li, 2003), most of which accommodated the carbonate platform, surrounded by narrow marginal transitional zones to the north (~ 800 km long) and south-to-southwest (> 1600 km long), along which shallow-water carbonates sharply change facies basinwards into black chert-shale ...٢١ شوال ١٤٣٥ هـ ... Carbonate Platforms Carbonate platforms consist of thick accumulations of shallow water carbonate sediment separated into a number of zones ...8/13/2019 Carbonate Platforms 1/47Carbonate Platforms8/13/2019 Carbonate Platforms 2/47I. Intro1. Limestones are biochemicalrocks2. Composed of CaCO31. Calcite, Aragonite3.…These biotic carbonate platforms were commonly modified by drowning or a shift to non-skeletal carbonates during the early Toarcian, temporally consistent with the extinction of reef-building ...

Whereas concept of physical accommodation prevails in carbonate ramp platforms dominated by hydrodynamic processes (wave, current) and without any reef structure, in rimmed carbonate platforms with reefal structure the concept of ecological accommodation take a lead where adherence of organism with one another with growth of reef can happen ...Such fractures are generally oriented parallel to the carbonate platform margin (Kosa & Hunt, 2005; Hunt et al., 2002; Narr, 2008). A second driver is differential compaction over pre-existing (antecedent) topography. Deformation can result from the flexure of early cemented carbonate strata over an ancient topographic high sitting below the ...Results from petrographic evidence as well as facies analysis demonstrate that the depositional environment of Jamal Formation in the studied area (Kharu village, East Tabas) exhibits the characteristics of a homoclinal carbonate ramp platform with the gentle slope. This platform is mainly composed of tidal flat, lagoon, and shoal sub …Backstepping of carbonate platform margins is an important process for understanding how carbonate platform responds to paleoenvironment changes. The products of backstepping, such as backstepped margin, backstepping surface and backstepping succession have been widely documented on both modern and ancient platforms around the world.The Apulia Carbonate Platform, a main palaeogeographic domain of the Mediterranean Tethys, is characterized by huge megabreccia bodies which were deposited along its flank at various intervals ...Carbonate platforms usually keep pace with subsidence and sea level rise but "platform drowning" occurs when carbonate sedimentation slows or when siliciclastics replace carbonates. Identifying specific mechanism(s) behind platform drowning is critical for understanding global environmental changes such as Ocean Anoxic Events (OAEs). ...The buildup morphology and seismic facies are linked to core facies that can help to uncover the complex development of the carbonate platform. Core-seismic calibration was used to create maps illustrating carbonate depositional settings for each stratigraphic unit.

Abstract Multichannel high‐resolution seismic and multibeam data were acquired from the Maldives‐isolated carbonate platform in the Indian Ocean for a detailed characterization of the Neogene bank architecture of this edifice. The goal of the research is to decipher the controlling factors of platform evolution, with a special emphasis on sea‐level changes and changes of the oceanic ...Highlights Carbonate platform paired δ 13 C carb and δ 13 C org record of the early Toarcian CIE. Demise of Lithiotis/Palaeodasycladus carbonate factory at the onset of the T-OAE CIE. Palaeophysiology indicates sensitivity of hypercalcifiers to ocean acidification. Shift from biotic to chemical carbonate factory across the T-OAE. Platform …Carbonate rock aquifers in Paleozoic rocks are flatlying to gently folded in places. Folded and faulted carbonate-rock aquifers are in the Appalachian and Rocky Mountain chains. The carbonate-rock aquifers that underlie Florida and adjacent states are called platform carbonates, and have intergranular porosity as well as large solution openings.The carbonate platform records the deposition of green algal grainstone, coated grain grainstone and bioclastic packstone, grainstone, floatstone and rudstone in shallow-waters, and burrowed bioclastic wackestone, microbioclastic peloidal packstone and grainstone, and fine-grained burrowed wackestone and packstone in the deep-water shelfal ...

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The post-volcanic carbonate platform (Fig. 12) is mainly consisting in slope facies, with a dip angle locally decreasing with respect to the pre-volcanic slope, and a narrow (about 40 m), bio-constructed margin belt. Inner platform succession has a mean thickness of 50 m and pinches out toward the margin belt. In the basin, a pelagic ...The platform was sometimes affected by storms that reworked the rock material. Soil properties imply that precipitation on Wōdejebato was less than 1 metre per year (39 in/year), but erosion by precipitation water and dissolution of parts of the carbonate platform have been inferred from dissolution traces in the rocks.Many isolated carbonate platforms are found in this area, providing mass-wasting materials as a sediment source for MTDs. The MTDs in the study area were divided into three types (slide, slump, and debris flow) based on their rheological properties. The MTDs were mostly distributed at the toe of the carbonate platform slope, where a large ...Platform carbonates are a major component of the Earth system, but their spatial distribution through geological times is difficult to reconstruct, due to the incompleteness of geological records, sampling heterogeneity, and their intrinsic complexity.all carbonate platform shapefiles and allowing them to persist until present day. Ages were ascribed based on the Golonka and Kiessling (2002) Phanerozoic timescale. However, ow-ing to new chronostratigraphic data, the geological times as-cribed to the existence of carbonate platforms in our modelCarbonate rock aquifers in Paleozoic rocks are flatlying to gently folded in places. Folded and faulted carbonate-rock aquifers are in the Appalachian and Rocky Mountain chains. The carbonate-rock aquifers that underlie Florida and adjacent states are called platform carbonates, and have intergranular porosity as well as large solution openings.

Carbonate platform drowning, i.e. the sudden to gradual demise of a shallow-water carbonate factory, is common in the geological record. Eustatic sea-level changes, variations in subsidence rates and environmental effects have been identified as controlling factors for such a development (Schlager, 2005 ).Distribution of facies on carbonate platforms; rimmed vs. unrimmed platforms; cross-bedded shoal facies; autocyclic and allocyclic models for genesis of mete...The Great Bank of Guizhou (GBG), an isolated carbonate platform of Permian-Triassic age in the Nanpanjiang Basin of south China (Figs. 1 and 2), is an ideal test case for assessing and quantifying ...The morphology of Carbonate platforms may be influenced by tectonic activity and eustatic variations. 3D seismic data and satellite imagery are used in order to investigate the morphological similarities between present-day carbonates platforms, East of Borneo Island and Miocene carbonate platforms of the South China Sea.Based on high-resolution seismic and well datasets, this paper examines the evolution and drowning history of a Paleocene-Eocene carbonate platform in the Offshore Indus Basin of Pakistan. This study uses the internal seismic architecture, well log data as well as the microfauna to reconstruct factors that governed the carbonate platform growth and demise. Carbonates dominated by larger ...The late Aptian Lower Serdj Formation (LSF) in the Northern Atlas of Tunisia records a mixed carbonate-siliciclastic system from the southern margin of Tethys. Sedimentological investigations of key sections in the Serdj-Bargou area along a NE-SW-platform-to-basin profile reveal five shallow-marine carbonate units (Cu1, Cu2, Cu3, Cu4a and Cu4b), dominated by subtidal deposits, separated by ...The Mega Platform is a 30- 50-km-large and 1.2-km-thick middle Miocene carbonate platform located in the Luconia Province, offshore Sarawak, Borneo.The Zhujiang carbonate platform (Liuhua 11-1 field, South China Sea) study shown here provides an example of an integrated approach combining high-resolution geochemistry, microfacies analyses and foraminiferal biostratigraphy in order to improve the reconstruction of environmental conditions prior, during and after platform demise and drowningThe Great Bahama Bank (GBB), an isolated carbonate platform that is dominated by nonskeletal sands and muds (15–17), has been at the center of the debate for over a century (8, 18–24). Broadly, there are three prevailing hypotheses for mud formation. First, carbonate mud could be formed by algae (7, 20, 25).Carbonate platforms are among the most important archives of Earth's biological and chemical histories and hold approximately half of the world's conventional petroleum reservoirs. Understanding the biologic, chemical and physical controls on carbonate platform architecture and facies distribution is therefore critical to interpreting the ...

Finally, the upliftment and subsidence of carbonate platforms by seismicity, and tsunami incidences with storm induced log drift have generated natural impacts of the loss of mangrove forests in carbonate settings of Andaman group of islands. Mangroves of Gujarat and Maharashtra coasts are threatened due to shortages of river flows into the ...

Ocean anoxia has been widely implicated in the Permian-Triassic extinction. However, the duration and distribution of the ocean anoxia remains controversial. In this study, the detailed redox changes across the Permian-Triassic boundary (PTB) in the shallow platform interior at Great Bank of Guizhou (GBG) has been reconstructed based on the high-resolution microfossil composition and multiple ...The Adriatic Carbonate Platform (AdCP), was a separate shallowmarine depositional system characterized by a lack of terrigenous input and was connected to Gondwana towards the South via Gavrovo ...Carbonate Debris Sheets and Turbidites, Exuma Sound, Bahamas. P. Crevello, W. Schlager. Geology. 1980. ABSTRACT Gravity-displaced carbonate sediments on the lower slope and basin floor of a Bahamian intra-platform basin were studied using closely-spaced sediment cores up to 5 m in length, 1500 km of….@article{osti_5857813, title = {Carbonate platform facies models}, author = {Read, J F}, abstractNote = {Various types of carbonate platforms are characterized by distinctive profiles, facies, and evolutionary sequences. Ramps may be homoclinal or distally steepened, and may have fringing or barrier shoal-water complexes of ooidpellet sands or skeletal banks.The Central Luconia province in the South China Sea, offshore Sarawak, features extensive development of Middle to Late Miocene isolated carbonate platforms. This study presents a regional seismic architecture – seismic facies review of platform flank geometries and off-platform depositional styles, with the goals of understanding their ...Hammad Tariq JANJUHAH, José Antonio GÁMEZ VINTANED, Ahmed Mohamed Ahmed SALIM, Ibrahima FAYE, Mumtaz Muhammad SHAH, Deva Prasad GHOSH, Microfacies and Depositional Environments of Miocene Isolated Carbonate Platforms from Central Luconia, Offshore Sarawak, Malaysia, Acta Geologica Sinica - English Edition, 10.1111/1755-6724.13411, 91, 5 ...These biotic carbonate platforms were commonly modified by drowning or a shift to non-skeletal carbonates during the early Toarcian, temporally consistent with the extinction of reef-building Lithiotis bivalves as well as other benthic organisms (Trecalli et al., 2012; Sabatino et al., 2013; Han et al., 2018; Jiang et al., 2020; Krencker et al ...١٩ رمضان ١٤٤٣ هـ ... Third, we provide an improved model for carbonate platform evolution since the Devonian and evaluate the interaction of subduction zones and ...Semantic Scholar extracted view of "Great Basin Paleozoic carbonate platform; facies, facies transitions, depositional models, platform architecture, ...Syndepositional marine cementation on carbonate platforms is a fundamental process that results in physical stabilization and lithification of sediments, as well as reduction in primary porosity ...

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The Late Triassic and Jurassic platform and the oceanic complexes in Evvoia, Greece, share a complementary plate-tectonic evolution. Shallow marine carbonate deposition responded to changing rates of subsidence and uplift, whilst the adjacent ocean underwent spreading, and then convergence, collision and finally obduction over the platform complex. Late Triassic ocean spreading correlated with ...Changing components, rock textures, lithofacies, platform types and architecture throughout time are unique characteristics of carbonate rocks. Characterizing these attributes has been approached by 1) building reference models for specific Phanerozoic intervals, 2) recognizing the climatic impact in modulating carbonate production, and 3 ...Energy has fueled industrialization and helped lift billions of people out of poverty. However, electricity and heat generation now contribute to significant global CO 2 emissions. We're working to decarbonize power without deindustrializing society. Our platforms can shift the energy mix away from fossil fuels and unlock the potential of clean ...The study area is located in the distal margin of the northern South China Sea (SCS), which ranges from shallow carbonate platforms to deep-sea basins . The Zhongsha Atoll (ZA) is the largest single atoll system of the SCS, forming a unique isolated carbonate platform situated in the study area.Other isolated carbonate platforms such as the Bahamas, the Maldives, or the platforms off northeastern Australia also record this episode of high Pliocene eustatic sea level (Eberli and Ginsburg ...The carbonate platform, where bunch of petroleum reserves are accumulated and discovered, is commonly a place with natural temporal-spatial boundaries (Red, 1985; Pomar, 2001). The boundaries of ...Carbonate platform stratigraphy is driven by the interaction between physical changes during basin formation and ecological evolution of biota. Ecological accommodation depends on a range of ...A carbonate platform is a sedimentary body which possesses topographic relief, and is composed of autochthonic calcareous deposits. Platform growth is mediated by sessile organisms whose skeletons build up the reef or by organisms which induce carbonate precipitation through their metabolism.The group of satellite images above show several small eddies swirling out from shallow waters along the Little Bahama Bank's carbonate platform. Similar swirls in the world's oceans are sometimes colored by large concentrations of certain types of phytoplankton —microscopic plant-like organisms that in abundance can discolor water and be ... ….

1. Evolution. 2. Biological Factor. 3. Climatic Zone. 4. Temperature-Salinity. 5. Clastic Sediment Input. 6. Water Depth-Turbidity . The actual factory dimensions of a carbonate factory are controlled by the size of the platform and the extent of siliciclastic sedimentation while the vertical extent is controlled by the depth of the photic zone.Carbonate platform development and sea level changes in the SCS Previous research, using methods such as lithostratigraphic, stable isotopic, biostratigraphic, and benthic foraminiferal analyses ( Miller et al., 2008 , Miller et al., 2011 ), has shown that ice-volume changes and monsoon strengths have a significant impact on global sea-level ...This isolated carbonate platform has slope angles ranging from 2 to 25°. Our interpretation of the seismic data is that the asymmetric and high-rising platform (250-300 m relief) has different ...The ESM and its peripheral isolated platforms underwent continued and inherited carbonate build-ups during the Middle Jurassic intercontinental rift stage, the Late Jurassic-Late Cretaceous Turonian passive drift stage, and Late Cretaceous Senonian-Miocene subduction stage, as well as medium-slight inversion transformation beginning in the ...Other isolated carbonate platforms such as the Bahamas, the Maldives, or the platforms off northeastern Australia also record this episode of high Pliocene eustatic sea level (Eberli and Ginsburg ...Carbonate Platforms. Examples of hidden mechanisms that modulate CO 2 outgassing are carbonate platforms, seen in the video above. These carbonate reservoirs—formed through eons of carbonate ...Toward the south, the Miocene Triton and Phanh Rang carbonate platform is located offshore south of Vietnam and covers more than 15000 km 2 (C and D in Fig. 1; Fyhn et al., 2009, Fyhn et al., 2013). These carbonate platforms continue to extend southward and also occur on the structural highs of the Nam Con Son Basin (E in Fig. 1; Lü et al., 2013).8/13/2019 Carbonate Platforms 1/47Carbonate Platforms8/13/2019 Carbonate Platforms 2/47I. Intro1. Limestones are biochemicalrocks2. Composed of CaCO31. Calcite, Aragonite3.…There are several methods for its preparation using glycerol as a platform molecule, but the transesterification method using dimethyl carbonate is the most efficient way employing mild reaction conditions and the least harmful reagents. ... Glycerol Carbonate as a Versatile Alkylating Agent for the Synthesis of β-Aryloxy Alcohols. ACS ... Carbonate platform, [text-1-1], [text-1-1], [text-1-1], [text-1-1], [text-1-1], [text-1-1], [text-1-1], [text-1-1], [text-1-1], [text-1-1], [text-1-1], [text-1-1], [text-1-1], [text-1-1], [text-1-1], [text-1-1], [text-1-1], [text-1-1], [text-1-1], [text-1-1], [text-1-1], [text-1-1], [text-1-1], [text-1-1], [text-1-1], [text-1-1], [text-1-1], [text-1-1], [text-1-1], [text-1-1], [text-1-1], [text-1-1], [text-1-1]