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detrital mica separation

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Thermal 40Ar/39Ar separation of diagenetic from detrital ...

2000-02-15· Although diagenetic illite-rich I/S dominates shale fine fraction, detrital mica is observed even in the <0.2 μm size fraction. Age spectra of shales consist of two portions: (1) a staircase-shaped low temperature section, corresponding to degassing of the diagenetic illite-rich I/S component, and (2) a peak in the high temperature section, corresponding to degassing of well-crystallized ...

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detrital mica separation - restauraceukubicku.cz

2006 2 1betweenanics and theanics, making separation using conventional techniques more difficult. This paper examines the relationshipanic Much of the mineral matter is detrital, for example quartz, mica and some associated clay minerals Figure 1. Kaolinite appears to be both detrital and derived from in si tu feldspar get price

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A new detrital mica 40Ar/39Ar dating approach for ...

2017-07-27· Sample EA12 from the Tiroler Achen River received minerals from the Northern Calcareous Alps units; the detrital white mica ages distribution is made of a narrow peak at 300 Ma. The Enns (EA13) sample was collected in the middle of the Northern Calcareous Alps unit that is characterized by a range of muscovite bedrocks ages of 300–200 and 100–50 Ma [ Liu et al ., 2001 ].

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Thermal 40 Ar/ 39 Ar separation of diagenetic from ...

2000-02-01· Although diagenetic illite-rich I/S dominates shale fine fraction, detrital mica is observed even in the <0.2 μm size fraction. Age spectra of shales consist of two portions: (1) a staircase-shaped low temperature section, corresponding to degassing of the diagenetic illite-rich I/S component, and (2) a peak in the high temperature section, corresponding to degassing of well-crystallized ...

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Thermal 40Ar/39Ar separation of diagenetic from detrital ...

Thermal 40 Ar/ 39 Ar separation of diagenetic from detrital illitic clays in Gulf Coast shales. Author links open overlay panel Hailiang Dong a Chris M Hall a Donald R Peacor a Alex N ...

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Detrital mineral chronology of the Uinta Mountain Group ...

Numerous studies have shown that large quantities of Grenville-age detritus dominate Neo-proterozoic to Cambrian arenites in southwest Laurentia (southwestern United States). U-Pb ages and Hf isotopic compositions of zircons and 40Ar/39Ar ages of white mica from clastic sedimentary rocks of the Neoproterozoic Uinta Mountain Group also indicate significant Mesoproterozoic detritus mixed with a ...

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Detrital mineral chronology of the Uinta Mountain Group ...

Numerous studies have shown that large quantities of Grenville-age detritus dominate Neo-proterozoic to Cambrian arenites in southwest Laurentia (southwestern United States). U-Pb ages and Hf isotopic compositions of zircons and 40Ar/39Ar ages of white mica from clastic sedimentary rocks of the Neoproterozoic Uinta Mountain Group also indicate significant Mesoproterozoic detritus mixed with a ...

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A new detrital mica 40Ar/39Ar dating approach for ...

A new detrital mica 40Ar/39Ar dating approach for provenance and exhumation of the Eastern Alps L. Gemignani1, Xilin Sun1, J. Braun2,3, T. D. van Gerve1, and J. R. Wijbrans1 1Department of Earth Sciences, Faculty of Earth and Life Sciences, Vrije Universiteit Amsterdam, Amsterdam, Netherlands, 2GFZ DeutschesGeoForschunngZentrum, Potsdam, Germany, 3ISTerre, Université Grenoble Alpes and

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Detrital zircons and the interpretation of palaeogeography ...

2019-10-03· Cadomian detrital white mica ages (612–585 Ma) occur in Middle–Upper Ordovician (Darriwilian–Hirnantian) sandstones, and Givetian sandstones have yielded micas dated at 487 Ma (Neuroth Reference Neuroth 1997). Stratigraphical breaks and transgressive contacts of lower Cambrian and basal Ordovician clastic sediments on older rocks (including Cadomian basement) suggest that those mica ...

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Provenance of Palaeozoic sandstones from the Carnic Alps ...

2004-03-20· Finally, mica grains were hand selected under a binocular microscope, and polished multigrain sections were prepared from seven concentrates of detrital white mica (Permian samples: DM2, 22, Carboniferous samples: DM4, 9, 14, Ordovician samples: DM3, 12). Sample DM3 represents the entire fraction (without concentration by magnetic separation) because of the scarcity of mica. …

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Precise tracing of exhumation and provenance using 40Ar ...

Precise tracing of exhumation and provenance using 40 Ar/ 39 Ar geochronology of detrital white mica: the example of the Central Alps Author(s) H. Von Eynatten H. Von Eynatten 1. Institut für Geowissenschaften, FSU Jena, Burgweg 11, D-07749 Jena, Germany (e-mail: [email protected]) Search for other works by this author on: GSW. Google Scholar; J. R. Wijbrans ...

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Thermal 40Ar/ 39Ar separation of diagenetic from detrital ...

Request PDF | Thermal 40Ar/ 39Ar separation of diagenetic from detrital illitic clays in Gulf Coast shales | The 40Ar/39Ar age spectra for illite-rich, mixed-layered illite/smectite (I/S) from ...

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Thermal 40Ar/39Ar separation of diagenetic from detrital ...

Thermal 40Ar/39Ar separation of diagenetic from detrital illitic clays in Gulf Coast shales. Earth and Planetary Science Letters, 2000. Donald Peacor. Chris Hall. Donald Peacor. Chris Hall. Download PDF. Download Full PDF Package. This paper. A short summary of this paper. 37 Full PDFs related to this paper . READ PAPER ...

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How detrital mica affects compactional porosity loss ...

1996-09-01· How detrital mica affects compactional porosity loss? Mátyás, János 1996-09-01 00:00:00 ABSTRACT Detrital micas are moderately abundant components in lithic sandstones. Examples from the Torte1 and Szolnok Formations (Pannonian basin) and from the Lower Freshwater Molasse and Upper Marine Molasse (Swiss Molasse basin) show that the response of micas to increasing effective stress …

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Detrital mineral chronology of the Uinta Mountain Group ...

2007-05-01· U-Pb ages and Hf isotopic compositions of zircons and 40 Ar/ 39 Ar ages of white mica from clastic sedimentary rocks of the Neoproterozoic Uinta Mountain Group also indicate significant Mesoproterozoic detritus mixed with a variably abundant Archean component. Zircons with ages representative of the Paleoproterozoic basement in the eastern Uinta Mountains or the younger …

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Effects of sampling and mineral separation on accuracy of ...

2012-05-11· [22] Distribution of detrital zircon ages can be significantly altered during the process of heavy mineral separation in the laboratory. The zircon yield from the sample, on the other hand, seems to be rather insensitive to the method used for mineral separation. This experiment with synthetic sediment sample shows almost constant zircon yield of 77–80% for most of the samples, except for ...

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Cretaceous 40Ar/39Ar detrital mica ages in Tertiary ...

Our new detrital mica ages may be the result of either excess Ar in the source rock, as commonly assumed for HP mica Ar ages from the internal western Alps, or of inherited Ar, and consequently be representative of real geological events. The first scenario would imply that incorporation of excess Ar in minerals can lead to non-random detrital age populations which could then mistakenly be ...

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Detrital heavy minerals, white mica and zircon ...

2010-12-01· This depositional history, and its relationship to the Grampian orogeny, to the pre- and post-collision arcs, and to sources in the Laurentian foreland, is recorded in detrital heavy mineral suites, Ar/Ar ages of detrital white micas, and U–Pb ages of detrital zircons. Heavy minerals record the progressive extensional unroofing of an obducted ophiolite complex, then the rapid extensional ...

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Precise tracing of exhumation and provenance using 40Ar ...

Precise tracing of exhumation and provenance using 40 Ar/ 39 Ar geochronology of detrital white mica: the example of the Central Alps Author(s) H. Von Eynatten H. Von Eynatten 1. Institut für Geowissenschaften, FSU Jena, Burgweg 11, D-07749 Jena, Germany (e-mail: [email protected]) Search for other works by this author on: GSW. Google Scholar; J. R. Wijbrans ...

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How detrital mica affects compactional porosity loss ...

1996-09-01· How detrital mica affects compactional porosity loss? Mátyás, János 1996-09-01 00:00:00 ABSTRACT Detrital micas are moderately abundant components in lithic sandstones. Examples from the Torte1 and Szolnok Formations (Pannonian basin) and from the Lower Freshwater Molasse and Upper Marine Molasse (Swiss Molasse basin) show that the response of micas to increasing effective stress …

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Detrital mineral chronology of the Uinta Mountain Group ...

2007-05-01· U-Pb ages and Hf isotopic compositions of zircons and 40 Ar/ 39 Ar ages of white mica from clastic sedimentary rocks of the Neoproterozoic Uinta Mountain Group also indicate significant Mesoproterozoic detritus mixed with a variably abundant Archean component. Zircons with ages representative of the Paleoproterozoic basement in the eastern Uinta Mountains or the younger …

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39Ar ages of detrital white mica from Upper Austroalpine ...

The contrasting detrital white mica ages are interpreted to reflect different source areas. Detrital muscovite from a post-Variscan Carboniferous molasse-type sequence and from a Permian Verrucano-type sequence record ages which indicate ‘‘late’’ Variscan (e.g. 330—300 Ma) metamorphic sources. By contrast, detrital white mica from another Permian Verrucano-type sequence suggests a ...

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Tectonic constraints from 40Ar/39Ar ages of detrital mica ...

Tectonic constraints from 40Ar/39Ar ages of detrital mica from flysch and molasse basins of the Eastern Alps: Original language: English: Number of pages: 1: Publication status: Published - 2001: Bibliographical note Gawlick, H. &. Sachsenhofer, R. (Hrsg.) 6. Österreichisches Sedimentologentreffen, Seewalchen am Attersee, 3. Nov. 2001, Kurzfassungen und Programm, p. 11 . Fields of Science and ...

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ABSTRACT: Effect of Detrital Muscovite on Illite ...

Separation techniques that presume the coarser detrital fraction can be removed are not effective for siliceous shales, which must be ground. Calcareous and organic-rich shales may require disaggregation by chemical treatment, which may alter illite peak sharpness. Shales with 1 to 7% detrital muscovite showed higher illite crystallinity on x-ray diffractograms if the coarser fraction was not ...

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Effects of sampling and mineral separation on accuracy of ...

2012-05-11· [22] Distribution of detrital zircon ages can be significantly altered during the process of heavy mineral separation in the laboratory. The zircon yield from the sample, on the other hand, seems to be rather insensitive to the method used for mineral separation. This experiment with synthetic sediment sample shows almost constant zircon yield of 77–80% for most of the samples, except for ...

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Detrital zircon geochronology - Wikipedia

Detrital zircon geochronology is the science of analyzing the age of zircons deposited within a specific sedimentary unit by examining their inherent radioisotopes, most commonly the uranium–lead ratio.The chemical name of zircon is zirconium silicate and its corresponding chemical formula is Zr SiO 4.Zircon is a common accessory or trace mineral constituent of most granite and felsic ...

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