The late Barremian Halimedides horizon of the Dolomites ...

It is approximately 20 cm thick and restricted to the uppermost part of the Puez Limestone Member (marly limestones; Hauterivian-Barremian; Puez Formation). It is fixed to the top 20 cm of bed P1/204. The grey-whitish limestone bed of the G. sartousiana Zone is penetrated by Aptian red marls-siltstones of the Redbed Member. The horizon is ...

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Groundwater in Karst Regions

2017-1-15 · limestones (CaCO3) and dolomites (MgCa(CO3)2), which are soluble in water charged with carbon dioxide gas. In these carbonate rocks the dissolving capacity is related to rock properties, the permeability of the ground, and tectonic movements. Climate is also an important factor in the solubility of limestones and dolomites. Carbonate rocks in

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New stratigraphic and genetic model for the dolomitic ...

2020-8-17 · Note: Stratiform stylolites are not restricted to limestones and dolomites. Very good examples are in quartzites of the Devonian "Grès armoricain" at Pointe de Pen Hir (48°16''03.1"N 4°36''57.1"W), near Camaret in Brittany, France . There, stylolites definitely required much deeper burial to develop than in limestones.

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Late Frasnian Atrypida (Brachiopoda) from the South …

2008-12-2 · algal limestones and secondary dolomites. The overlaying evaporite-carbonate deposits of the topmost Frasnian in South Timan are without brachiopod faunas, and the F-F transition is poorly documented in these fossil-impoverished se- ... small, restricted basin; and (3) red-coloured, continental (E and S borders). Deposits of this age are

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Facies and early dolomitization in Upper Albian shallow ...

2013-2-13 · Restricted platform successions consist of well-bedded cyclic limestones and dolomites capped by silicified evaporites and green marls. Petrographic and geochemical data are used to highlight the control of short-term climatic variability on facies and early diagenesis.

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Formation environments and mechanisms of multistage ...

2021-1-12 · The Ordovician section in the Huai-Fu Basin is mainly composed of dolomitic limestones (Fig. 3a), breccia limestones (Fig. 3b), argillaceous limestones (Fig. 3c), and dolomites (Fig. 3d), with a ...

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Identification signs for sedimentary facies of complex ...

Argillaceous limestones: brown grey, light brown grey, grey and dark grey, indicating reducing environemnts. Dolomites: grey brown, indicating weak oxidation environments (Fig.2). Fig.1 Intraplatform shoal of open platform Fig.2 Dolomitic flat of restricted platform

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Geologia Croatica

tion of algal and stromatolitic limestones and dolomites, calcilutites, intrasparites and biointraspa- rites. The limestones were deposited in a restricted shelf environment. Stromatolitic and fenestral layers indicate intertidal conditions of sedimentation. Limestone brec- cia with calcitic and bauxitic cement and bauxite were formed on the ...

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Limestone, Shell, Dolomite | Florida Department of ...

2021-8-24 · The Mining and Mitigation Program administers reclamation, environmental resource/stormwater management, and federally-delegated dredge and fill (State 404) permit programs for mining operations in Florida, including limestone, shell and dolomite mines. Reclamation standards for limestone, shell and dolomite mining are detailed in Part II of Chapter 211, Florida …

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Classification and environmental significance of ...

Stromatolitic and cryptalgalaminate carbonate sediments appear to be restricted to the intertidal zone, but thrombolites and oncolites do not. Description of some cryptalgal fragmental limestones and dolomites draws attention to the sediment-forming role o,f the non-calcareous algae, which in view of widespread emphasis on the sediment-binding ...

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Balancing cross sections with kinematic constraints: The ...

in the Dolomites (Bellerophon Formation), whereas deltaic, meandering, and braided fiver clastics follow to the west (Gardena and Verrucano Lombardo Formations [Assereto et al., 1973]). Limestones, marls, siltstones, and locally also evaporites were sedimented on …

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Diagenesis of an Upper Devonian carbonate-evaporite ...

Limestones are present only in the eastern part of the study area, and were altered by meteoric and burial diagenesis and do not retain marine δ 18 O values. δ 18 O values of replacement dolomites have limited range (-3‰ to -5‰) and may indicate dolomitization by hypersaline marine waters having low δ …

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Limestone

Andrew Mitchell, in Geological Belts, Plate Boundaries, and Mineral Deposits in Myanmar, 2018. 2.7.1 Evolving Ideas on Plateau Limestone Stratigraphy. Limestones and dolomites of mostly late Paleozoic age from the Shan States west of the Salween River were known to geologists of the GSI by the end of the 19th Century. Middlemiss (1900) referred to his Great Limestone Zone in the Southern Shan ...

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Origins and Geochemistry of Dolomites and Their ...

The sedimentary facies of the basin are characterized by restricted to evaporitic platform facies. The rocks of the Leikoupo Formation are characterized by multiple cycles of marine carbonates and evaporites, including limestones, dolomites, gypsum, and salt …

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ORIGIN OF DOLOMITE MOTTLING IN ORDOVICIAN LIMESTONES …

ORIGIN OF DOLOMITE MOTTLING IN ORDOVICIAN LIMESTONES FROM SASKATCHEWAN AND MANITOBA A. C. Kendall. A. C. Kendall ... dolomitization of mottle-matrices has generated colour-mottled dolomites. ... Anhydrite pseudomorphs after later-diagenetic halite crystals are restricted to dolomite mottles. This restriction indicates that, when halite grew ...

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Composition, Diversity and Functional Analysis of the ...

2019-12-31 · The Middle Triassic sequence consists of approximately 1,000 metres of reef limestones, dolomites, and bituminous shales which formed in marine conditions at …

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Origin of Dolomite in the Arab-D Reservoir from the …

2002-11-21 · dolomites and limestones in the reservoir, both in terms of their impact on reservoir quality as ... throughout the Arab-D and is not restricted to the carbonate-evaporite transition in Zone 1. The third dolomite type, baroque, is a coarsely crystalline dolomite with ''saddle-shaped'' crystals

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In situ geochemistry of Lower Paleozoic dolomites in the ...

We investigated several outcrop sections and found that the Penglaiba Formation, at the bottom of Lower Ordovician is mainly composed of open to restricted platform facies limestones and dolomites with several siliceous rock interlayers. It develops more abundant pores, fractures, vugs, and diagenetic dolomite minerals than other formations.

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Sedimentary rock

2  · @article{osti_5969468, title = {Limestone and dolomite reservoirs}, author = {Wilson, J L}, abstractNote = {Limestones and dolomites form important reservoirs for oil and gas, but a realization of the future significance of these strata for hydrocarbon production in the noncommunist world is not known. Carbonates currently produce 38% of the oil and gas from the world''s giant fields, a fair ...

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On the Characterization of Porosity and Permeability in ...

2012-12-31 · On the Characterization of Porosity and Permeability in Limestones* Philippe Gouze1 . ... About half of all producing oil reservoir are limestones and dolomites. While porosity and some other physical properties are routinely ... Albeit being restricted to millimeter to few tens of centimeters size samples, X-ray tomography (XMT), coupled with ...

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Sedimentary rock

Mineralogy. Though ancient limestones and dolomites are composed of calcite and dolomite, respectively, other calcite group minerals such as magnesite (MgCO 3), rhodochrosite (MnCO 3), and siderite (FeCO 3) occur in limited amounts in restricted …

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Isotope signatures associated with early meteoric ...

They might be used to identify limestones diagenetically altered in meteoric environments, to identify mixing zone cements and dolomites, and to trace the regional and vertical distributions of early meteoric groundwater systems in ancient carbonate formations.

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The late Barremian Halimedides horizon of the Dolomites ...

It is approximately 20 cm thick and restricted to the uppermost part of the Puez Limestone Member (marly limestones; Hauterivian–Barremian; Puez Formation). It is fixed to the top 20 cm of bed P1/204. The grey–whitish limestone bed of the G. sartousiana Zone is penetrated by Aptian red marls–siltstones of the Redbed Member. The horizon is ...

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Biostratigraphy and carbon-isotope stratigraphy of the ...

2013-8-15 · Unit 4 consists of alternating dolomites and grayish dolomitic marls and intercalated with thin dolomitic limestones and soft green marls (with abundant bivalves). The upper part of unit 4 is restricted to the Admir Section and consists of fossiliferous white limestones (often nodular) with planktonic foraminifera, and

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Dolomite | rock | Britannica

In sedimentary rock: Mineralogy. Though ancient limestones and dolomites are composed of calcite and dolomite, respectively, other calcite group minerals such as magnesite (MgCO 3), rhodochrosite (MnCO 3), and siderite (FeCO 3) occur in limited amounts in restricted environments.Modern carbonate sediments are composed almost entirely of metastable aragonite (CaCO 3) and magnesium-rich …

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AAPG Datapages/Archives: A Petrophysical Evaluation of the ...

Dolomites associated with faults produce at up to ten times the rate of the limestones because of the contribution of fractures to flow capacity. Hydrocarbon pore volumes of limestones and dolomites are similar. Four wells, drilled into the vuggy dolomites account for two thirds of the gas, 67 Bscf, and all of the oil, 2.2 MMbbls, produced to date.

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A NEW MODEL FOR THE FORMATION OF DOLOMITE IN THE …

2014-12-19 · Limestones comprise 2–3% of the platform carbonates and are restricted to narrow corridors (tens to a few hundred metres wide, hundreds of metres long and high) within the dolomite. The mainly sucrosic dolomites of the Pale are interpreted as the result of recrystallization of a depositional, nearly stoichiometric Mg calcite under burial ...

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Availability of Limestones and Dolomites: Task #1 Final Report

Most of the stone is fairly pure, above 87% calcium carbonate, and locally it is of high purity. High grade limestones are generally restricted to extreme eastern Kansas, particuarly in the Kansas City area and the southeastern counties. Dolomites are found in south central and southwestern regions and, though not high grade, are fairly pure.

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Stromatolitic dolomites in the late precambrian malmesbury ...

1978-1-1 · The chemical composition of these high-grade limestones which most probably overlie the dolomitic succession is presented in Table I for comparison. Schidlowski et al. (1975) investigated the carbon and oxygen isotopic composition of Malmesbury dolomites and limestones in the Vanrhynsdorp area. The 513C values are +23.2 and +25.6, respectively.

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