Formation environments and mechanisms of multistage ...

2021-1-12 · The Majiagou Formation is mainly composed of thick dolomitic limestones and dolomites (Fig. 2), with an average thickness of 150 m; the Xiaoxian Formation is primarily composed of …

Sedimentary rock

Limestones and dolomites. Limestones and dolomites are collectively referred to as carbonates because they consist predominantly of the carbonate minerals calcite (CaCO 3) and dolomite (CaMg[CO 3] 2).Almost all dolomites are believed to be produced by …

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 ...

Geological and Hydrogeological Investigation of Kozluk ...

2010-9-9 · Mardin Group is mainly composed of dolomites and limestones of Aptian - Turonian age and it is an important reservoir for oil accumulation in the south eastern Turkey. It is observed in between 1920-2400m depths in the well Selmo-32 A (Fig. 4). Mardin Group comprise the below formations in general. 3.1 Areban Formation

Limestone and dolomite

2021-6-2 · Tertiary limestones; Quaternary limestones made up mainly of sand-sized shell fragments that have been blown into dunes, some of which have consolidated. Deposit sites and uses. Silurian–Devonian limestones are confined to the eastern half of Victoria, with major deposits at Buchan (Rocky Camp), Bindi, Lilydale, Limestone …

AAPG International Conference Barcelona, Spain …

2010-2-24 · Nodular thin-bedded to massive limestones (mainly wakestones and packstones), and marly limestones with dolomitic limestones and dolomites intercalated. The limestones record are rich in fossils as bivalves, gastrops, ostracods ans larger foraminifera. The materials from this have been attributed by different authors to Dolomitic

Sedimentary rock

2021-8-18 · Sedimentary rock - Sedimentary rock - Origin of limestones: Limestones originate mainly through the lithification of loose carbonate sediments. Modern carbonate sediments are generated in a variety of environments: continental, marine, and …

A review of carbonates as hydrocarbon source rocks: basic ...

2019-7-26 · Carbonate rocks are sedimentary rocks dominated by carbonate minerals and include two main categories: limestones and dolomites (Ham and Pray 1962; Leighton and Pendexter 1962; Zhao et al. 2016) classical petroleum geology and geochemistry, these rocks typically form hydrocarbon reservoirs, while some organic-rich carbonate rocks formed in low-energy environments can also act …

Limestone and Dolomite Resources of Africa — …

This publication describes occurrences of limestone and dolomites in the African countries. All rock types containing industrially useful quantities of calcium and/or magnesium carbonates, including limestones and dolomites proper, as well as various sedimentary, metamorphic and igneous rocks such as marble, travertine, calcrete, carbonatite, hydrothermal veins of calcite and dolomite, etc ...

Limestone

Sedimentary rock - Limestones and dolomites | Britannica

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 ...

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

In the Penglaiba Formation strata, limestones were developed at the bottom and top, dolomites were developed in the middle, and several siliceous rock interlayers were distributed mainly in middle dolomites and also in upper limestones (Figures 2b–2e and 3b).

2015-1-9 · i.e. bioclastic limestones (dolomites), intraclastic limestones (dolomites), arenaceous limestones (dolomites) and argillaceous limestones (dolomites). With core calibrated logs, the electrical characteristics interpretation criteria for various carbonates are

Dolomite formation in breccias at the Musandam Platform ...

2006-4-1 · Layered dolomites consist mainly of type 1 dolomite and display less depleted signatures. The depleted carbon and oxygen values of the type 2 dolomites can be explained by a high-temperature fluid with carbon originating from oxidation of hydrocarbons. Fluid inclusions in early calcite veins in the limestones are filled with hydrocarbons.

Nature, Origins and Evolution of Porosity in Dolomites

Compared to limestones, dolomites are much more intensively fractured and a relatively greater number of fractures appear in dolomites (Aguilera 1980;Stearns and Friedman 1972) as dolomite is more ...

Original paper Mineralogy and origin of supergene ...

2014-1-3 · in the Hronic Unit are mainly Triassic limestones and dolomites. The Silicic Unit in the Poniky area (Drienok Nappe, Bystrický 1964) has a stratigraphic range from Lower to Upper Triassic (Polák et al. 2003b). A char-acteristic Lower Triassic member of the Drienok Nappe are acid volcanites and associated pyroclastic rocks (Slavkay 1965).

Middle Permian dolomites of the SW Sichuan Basin and the ...

2021-6-1 · The carbonate rocks in the southwest Sichuan Basin were composed mainly of limestones, dolomites, and transitional rocks such as dolomitic limestones and limy dolomites. Based on Dunham (1962), limestone samples were classified as wackestone, packstone and grainstone. Dolomite samples were divided into matrix-replacement dolomite (Md) and ...

Boron in the carbonate rocks of the Kajrahat formation ...

2019-4-9 · The limestones and dolomites of Kajrahat formation also contain shales as minor constituents. For the purpose ofcomparison, the author has analysed fivesamples of the shales ... The lower part of the sequence is mainly limestones with thin bands ofdolomites, whereas the upperpartgradually becomes completely dolomitic. The

Facies and early dolomitization in Upper Albian shallow ...

2013-2-13 · In fact, Albian-Cenomanian organic-rich dolomites, which accumulated into shallow intraplatform basins, have been identified as the source rocks of the Val d''Agri and Tempa Rossa oil-fields (Bertello et al. 2010). The same stratigraphic interval in the reservoir is mainly represented by dolomitized limestones (Bertello et al. 2010).

Biancone transformed into dolosparite: evidence for ...

2015-6-15 · In the Dolomites, Lower Cretaceous cephalopod-bearing deposits are mainly recorded in two different facies, the calcareous limestones of the Biancone Formation (= Maiol-ica Formation elsewhere in Italy) and the Puez Formation (marls–marly limestones). The Lower Cretaceous relicts are situated on the Triassic limestones of the Dolomites

The Evolution of Limestone and Dolomite. I

limestones and dolomites inclosing the chitinous fossil Beltina donai in the Clarke range and the Siyeh and Sheppard siliceous limestones of northwestern Montana, probably of middle Cambrian age. He also quotes Vogt as stating that the finest grained Nor-wegian dolomites …

Permeability and Porosity Evolution in Dolomitized Upper ...

1994-5-25 · The pelagic lime mudstones have median porosities and permeabilities which are markedly lower than those of the dolomites that have replaced them locally. Although the lower porosities in the non‐dolomitized micrites could result from differential compaction, the absence of visible burial compaction fabrics suggests that the more elevated ...

Sedimentary rock

2021-8-26 · Carbonate rocks: limestones and dolomites. Limestones and dolostones (dolomites) make up the bulk of the nonterrigenous sedimentary rocks. Limestones are for the most part primary carbonate rocks. They consist of 50 percent or more calcite and aragonite (both CaCO 3).Dolomites are mainly produced by the secondary alteration or replacement of limestones…

Aspects of geodiversity of Palaeozoic limestones in the ...

2021-7-28 · the geodiversity of carbonate formations (limestones and dolomites), mainly of Paleozoic age, can be observed in the nested scales of the geotopes, geofacies, and geosystems. KEYWORDS: geography, geology, geomorphology, geodiversity, Black Mountains (Montagne Noire ), Tolkien, France This article was submitted for publication on October 9th, 2014.

Chapter 5 LIMESTONES

2020-12-31 · Dolomites containing some percentage of Fe2+ are called ferroan dolomite. The middle member of the range between dolomite and hypothetical (Fe, Ca)(CO3)2 is called ankerite. There are also a few significant carbonate evaporite minerals (trona, natron) we won''t consider here. 2.2 Figure 5-1 is a composition triangle showing the range of carbonate

Difference Between Limestone and Dolomite | Compare the ...

2013-12-3 · Limestone mainly consists of two types of minerals; namely, calcite and aragonite. These are two different forms of calcium carbonate itself. The source of these calcium depositions are usually the left-over shell secretions/skeletal fragments of marine organisms such as corals. Therefore, limestone is a type of sedimentary rock formed by the ...

Metamorphism of Dolomites and Limestones | Request PDF

There are two main types of carbonate rocks, dolomites and limestones. The first is modally dominated by dolomite (CaMg (CO3)2), the second by calcite (CaCO3) and there is a complete gradation ...

Durability Test on Iowa Limestones and Dolomites

2021-3-22 · ing composed mainly of quartl grains, is felt to have uniformly good enough durability characteristics to make a fine aggregate soundness test generally unnecessary. Iowa gravel coarse aggre­ gates have had a long history of transportation and weathering . 279 . 1 Wood: Durability Test on Iowa Limestones and Dolomites

Dolomite origin and its implication for porosity ...

2016-9-1 · For another, the homogenization temperatures of fluid inclusions in type 2 dolomites range from 60 °C to 200 °C (mainly from 100 °C to 160 °C; Fig. 17), indicating that the dolomites are precipitated at a depth of at least 1400 m on the assumption that the near-surface temperature is 25 °C and the geothermal gradient is 25 °C/km ...

59. CYPRUS EVAPORITES Theodoulos M. Pantazis, …

2007-7-27 · limestones and dolomites overthrust on younger chalky sedi-ments and turbidites. The Mesaoria Plain, separating these two zones, is a subsided ... evaporites (mainly gypsum) of the Kalavasos Forma-tion. Salt has only been found in the northern …

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