Original paper Mineralogy and origin of supergene ...

2014-1-3 · as limestones and dolomites (Polák et al. 2003b). 2.2.opper mineralization of the Farbiště C occurence Early exploration and small-scale mining at the locality took place in the 19th century in an adit situated in the supergene zone (Figs 2, 3a). In 1959–1960, an extensive geological exploration (boreholes, test pits) was started.

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Detrital zircon ages and provenance of the Upper Paleozoic ...

Lower Devonian strata are <1 km thick and consist of limestones, dolomites, clayey limestones, and clayey dolomites, with subordinate beds of argillites and siltstones (Kos''ko et al., 1985). The Middle Devonian strata (Sokolov Formation) rest on different stratigraphic levels of the Lower Devonian carbonates with disconformity, with ...

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Determination of calcium, magnesium, manganese, …

1980-1-1 · Major and trace element associations in limestones and dolomites Chem. Geol., 14 ( 1974 ), pp. 273 - 280 Article Download PDF View Record in Scopus Google Scholar

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Palaeogeographic and stratigraphic distribution of mid ...

2004-7-9 · and Middle Jurassic oolitic limestones and dolomites. The upper boundary is recognized by the record of Epipeltoceras and is usually related to a slight increase in the clay content. Relatively distal areas of the shelf (Internal Prebetic) are characterized by lithofacies with abundant lumps and on-coids of nubeculariids, and show more ...

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Geological history of Yorkshire

2021-8-28 · Four major cycles of limestones, later altered to dolomites, and succeeding evaporites, including gypsum (now anhydrite), halite and potash salts, were developed. These cycles resulted from periodic recharge of the basin by normal marine waters, from which limestones, ''many oolitic and locally fossiliferous, were formed around the margins.

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Upper Jurassic-Lower Creta-ceous limestones from the ...

2020-8-17 · Upper Jurassic-Lower Cretaceous limestones from the H ... ainsi que des associations micropaléontologiques, qui couvrent en partie la limite Jurassi- ... sandstones, marls, dolomites and cherty limestones (SĂNDULESCU, 1975). Nodular limestones, sandy limestones with Saccoccoma sp., interbedded sandy limestones and marls de-

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SEDIMENTARY ROCKS

LIMESTONES AND DOLOMITES 316 Introduction 316 Definitions 316 Occurrence of Limestones 316 Economic Value of Limestones 317 General References 317 ... associations 364 Diagenesis of Carbonate Rocks 365 Cements and Cavity Fillings 366 Solution 367 Grain Growth (Aggrading Neomorphism) 368

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Major and trace element associations in limestones and ...

 · Major and trace element associations in limestones and dolomites. Barber, C. Abstract. Publication: Chemical Geology. Pub Date: December 1974. DOI: 10.1016/0009-2541 (74)90064-3.

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Fracture dolomite as an archive of continental palaeo ...

2020-10-21 · The origin of Quaternary dolomites in continental environments (e.g. karst and lakes) is barely constrained compared to marine dolomites in sedimentary records. …

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Sedimentology and petrology of the Cañete Dolomites and ...

The Cañete Dolomites and Limestones Formation (Muschelkalk Facies, Middle to Upper Triassic) of the South Iberian Ranges (East Spain) displays a carbonate ramp evolution with characteristic features like shoal, lagoon and tidal flat subenvironments. Six individual facies and five main facies associations have been defined. The general facies association succession allows to recognize a main ...

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Chapter 15 Sedimentary facies and biotic associations in ...

The Thitsipin Limestone Formation mainly comprises limestones and dolomites. Foraminifers reported from the lower part of this carbonate unit suggest Kungurian or Roadian age (Zaw Win et al., 2017) .

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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 ...

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Origin and evolution of Upper Triassic to Miocene clay ...

2010-12-28 · consist of dolomites occasionally containing marly and oolithic limestone beds. These sediments grade upwards into partially oolithic limestones representing the late Aalenian. During the Bajocian grey locally silicified limestones with several marly intercalati ons were accumulated again (90-170m), The latter as well as the grey limestones and

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Plant Life of the Dolomites

The landscape and vegetation of the Dolomites have characteristics that are very particular. Some 2300 species live here, about a fifth of the flora in Europe as a whole. This book depicts what the plant cover of the Dolomites is composed of, how it was …

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Discovery of a shoal-controlled karst dolomite reservoir ...

2017-9-27 · Leopard porphyritic dolomites as well as some limestones are mainly developed in the upper part of the Qixia Formation, and are associated with grainstones. Dark and light patches can be observed. Dark ones are dolomites, and undolomitized plastic limestone breccia can be seen in the larger dark patches (Figure 3(d)).

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Visean, Carboniferous Evaporites in Leitrim, Ireland

2018-6-1 · A sequence of thinly bedded limestones, dolomites, shales and sandstones contains evaporitic beds in County Leitrim and Cavan, Republic of Ireland. This sequence constitutes the Aghagrania Formation (new name) of B2 to P1c age, (Upper Visean - …

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Sedimentology and sequence stratigraphy from a mixed ...

2015-3-1 · Logs of the lithofacies and facies associations are shown in Fig. 4 and field pictures of facies associations can be seen in Fig. 5, Fig. 6. The most representative microfacies are shown in Fig. 7 and a detailed description is in Table 2 in the supporting online material. For limestones, the Dunham classification (1962) is used.

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Chapter 15 Sedimentary facies and biotic associations in ...

The Plateau Limestone, a thick carbonate rock unit representing Permian–Triassic stratigraphy in Myanmar, is extensively developed on the Shan Plateau of eastern Myanmar. The name was proposed first by La Touche (1913) for thick dolomites and crystalline limestones of Devonian and Permo-Carboniferous age, widespread throughout the Shan Plateau.

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Facies, depositional environment, and palaeoecology of the ...

2010-5-28 · The Ladinian Cassina beds belong to the fossiliferous levels of the world-famous Middle Triassic Monte San Giorgio Lagerstätte (UNESCO World Heritage List, Canton Ticino, Southern Alps). Although they are a rich archive for the depositional environment of an important thanatocoenosis, previous excavations focused on vertebrates and particularly on marine reptiles.

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Constraining dolomitization by Mg isotopes: A case study ...

2016-2-23 · Dolomites in the inter‐grain spaces are anhedral (nonplanar) (Figure 3e), while the crystal shape is confined by grain boundaries in dolomitized carbonate grains (Figure 3f). In contrast, dolomites in ribbon rocks are subhedral with planar crystal edges (planar‐s) (Figure 3 d), …

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1 The Environment of Dolomites: the General A Outline 1

The Principal Rupestrian Associations: The Potentilletum Associations 490 Some of the Record-Holding Plants of the Dolomites 491 Conclusion of the Plant Association Survey (Chaps. 2-13) 493 Data Sheets 499 Androsacetum helveticae Br.-Bl. 1918 499 Campanuletum morettianae Pign. E. et S. 1978 501

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Holocene meteoric dolomitization of Pleistocene limestones ...

Zdzislaw M. Migaszewski, Devonian Dolomites from the Holy Cross Mts, Poland: A New Concept of the Origin of Massive Dolomites Based on Petrographic and Isotopic Evidence, The Journal of Geology, 10.1086/629483, 99, 2, (171-187), (1991).

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FACIES ASSOCIATIONS AND MICROFOSSILS FROM THE …

2020-2-22 · FACIES ASSOCIATIONS AND MICROFOSSILS FROM THE MIDDLE-UPPER TRIAS-SIC LIMESTONES OF THE TRANSILVANIAN NAPPES (PERȘANI MOUNTAINS, EASTERN CARPATHIANS, ROMANIA) ... stones and dolomites covered by Steinalm type limestones with abundant foraminifera and dasycladalean algae (Fig. 1c).

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Sedimentary Rocks in the Field

2007-12-10 · 5.4 Depositional structures of limestones (including dolomites) 5.5 Post-depositional sedimentary structures 5.6 Biogenic sedimentary structures 5.7 The geometry of sedimentary deposits and lateral fades changes 111 6 Fossils in the field 6.1 Introduction 6.2 Fossil distribution and preservation 6.3 Fossil associations and diversity 6.4 ...

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(PDF) Dolomite: Occurrence, Evolution and Economically ...

associations. John Warren. ... dolomites and limestones Wolf and Surdam,. 1974 . Individual units contain stromatolites, ripples, flat pebble breccias, oolites, mudcracks and extru-

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FACIES ASSOCIATIONS AND MICROFOSSILS FROM THE …

2019-9-8 · FACIES ASSOCIATIONS AND MICROFOSSILS FROM THE MIDDLE-UPPER TRIAS-SIC LIMESTONES OF THE TRANSILVANIAN NAPPES (PERȘANI MOUNTAINS, EASTERN CARPATHIANS, ROMANIA) ... stones and dolomites covered by Steinalm type limestones with abundant foraminifera and dasycladalean algae (Fig. 1c).

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Early Cretaceous benthic associations (foraminifera and ...

2006-6-9 · Early Cretaceous benthic associations (foraminifera and calcareous algae) of a shallow tropical-water platform environment (Mljet Island, southern Croatia) ... limestones and dolomites and, sporadi-cally, intraformational breccias. These sediments accumulated in shallow-marine, tropical-water platform environments, sim-

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Major and trace element associations in limestones and ...

1974-12-1 · Selective chemical separations of mineralogical constituents of limestones (Carboniferous limestones from the Isle of Man, and Lincolnshire limestone, Middle Jurassic, Lincolnshire) and dolomites (from Carboniferous limestone, Isle of Man) using dilute acetic acid and hydrogen peroxide have been used and the fractions obtained analysed to evaluate mineralogical associations of trace and major …

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Porosity enhancement potential through dolomitization of ...

2021-5-15 · The micritic limestones within the "limestone zone" were non to slightly replaced by the primary dolomites and/or the dolomicrites (the early phase of dolomitization), here, the content of the dolomites is usually less than 20% (Fig. 8a, b and c), the dolomicrites are characterized by very fine particles that are less than 20 μm in size.

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The Y oUDger Palaeozoic deposits in the basement of the ...

characteristic mixed associations can be present as well, for example calcisphaere-forami­ ... The next (V) lithostratigraphic unit comprises vadose limestones and vadose dolomites. The lower part of the unit is a massive complex of light coloured, cavernous dolomites without any fossils (Fig. 2), whereas the upper part is built of light ...

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Environments of limestone deposition | Journal of ...

Basin limestones of the open basin type are lithologically similar to platform limestones, but display differential thickening. Barred basin limestones are typically the first stage in depositional cycles which include primary dolomites and evaporites. Basin margins are commonly marked by linear zones of reef limestones.

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MACROFUNGI IN FOREST ASSOCIATIONS OF THE …

The mycoflora from similar associations on limestones and dolomites is compared in other columns. Only one association on dolomites, the Helleboro-Pinetum, does not have its cor- cresponding association on limestones. The abundance of species is indicated after the scale of J a h n, Nespiak & Tüxen (1967) as: a = abundant, n = numerous, ...

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