Complex examination of the Upper Paleozoic siliciclastic rocks from southern Transdanubia, SW Hungary—Mineralogical, petrographic, and geochemical study

Varga, Andrea; Szakmány, György; Árgyelán, Tibor; Józsa, Sándor; Raucsik, Béla; Máthé, Z.

doi:10.1130/2006.2420(14)

Cited by 11 publications

(42 citation statements)

References 27 publications

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“…Терригенные породы низов оселковой серии (мар-нинская и нижняя часть удинской свиты) имеют отличные от верхов этой же серии (верхняя часть удинской и айсинская свита) петрохимические ха-рактеристики. Так, на классификационной диа-грамме log(Na 2 O/K 2 O) -log(SiO 2 /Al 2 O 3 ) [Varga et al, 2007], модифицированной после [Pettijohn et al, 1972] (рис. 6) точки составов пород верхней части оселковой серии попали в поля аркозов и лититов, тогда как фигуративные точки пород нижней части оселковой серии сместились от полей субаркозов и аркозов в поле пород, демонстрирующих потерю Nа 2 O [Varga et al, 2007].…”

Section: петрогенные элементыunclassified

“…6. Классификационная диаграмма log(Na 2 O/K 2 O)-log(SiO 2 /Al 2 O 3 ) для песчаников [Varga et al, 2007], мо-дифицированная после [Pettijohn et al, 1972]. Условные обозначения см.…”

Section: петрогенные элементыunclassified

“…Петро-графические и геохимические особенности, отме-ченные в породах марнинской и нижней части удинской свиты, являются типичными для процес-сов эпигенетической проработки пород [Kopeliovich, 1965;Nozhkin, Gavrilenko, 1976;Yudovich, Ketris, 2008]. Низкие содержания Na 2 O в песчаниках и гра-велитах марнинской и нижней части удинской сви-ты могут указывать на потерю Na 2 O в результате его высокой мобильности в процессах химического выветривания, диагенеза и катагенеза [McLennan, 2001;Varga, Szakmány, 2004;Varga et al, 2007]. В то же время в области источника сноса для терри-генных отложений марнинской и нижней части удинской свиты нельзя полностью исключать и присутствие пород, имеющих низкие содержания Na 2 O. Что касается пород верхней части удинской свиты и айсинской свиты, то они на исследуемой территории остались практически неизмененны-ми.…”

Section: обсуждение результатовunclassified

“…10) точки составов пород марнинской свиты, имеющие значения K 2 O/Na 2 O от 27 до 75, а также фигуративные точки пород нижней подсви-ты удинской свиты, значения K 2 O/Na 2 O для кото-рых варьируются от 10 до 33, образуют тренд, параллельный линии А-К. Такой тренд может свидетельствовать о том, что эти породы были подвержены эпигенетическим преобразованиям [Yapaskurt, 1994;Yudovich, Ketris, 2008], в процессе которых произошел вынос Na 2 O [McLennan, 2001;Varga, Szakmány, 2004;Varga et al, 2007], а также распад калиевых полевых шпатов, приводящий к их глинизации и регенерации [Fedo et al, 1995]. По-добные изменения терригенных пород марнинской и нижней части удинской свиты не позволяют в полной мере использовать индекс CIA [Nesbitt, Young, 1982], так как при его расчете учитываются содержания Na 2 O.…”

Section: характеристика процессов палеовыветриванияunclassified

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The Composition and Reconstruction of the Source Area for the Late Precambrian Terrigenous Rocks of the Oselkovaya Series (Biryusa Prisayanie)

Motova¹,

Донская²,

Гладкочуб³

2016

Geodin. tektonofiz.

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Abstract:We present results from petrographic and lithogeochemical studies of the Late Precambrian terrigenous rocks (sandstones, gravelites, and aleuritic sandstones) from the Oselkovaya series of Prisayanie. The studies were conducted to reconstruct the primary composition of the rocks in the source area. It has been found that the rocks in the lower part of the cross-section of this series (Marninskaya suite, and the lower part of the Udinskaya suites) are represented by more coarse-grained terrigenous rocks (gravelites, and sandstones) as compared to the upper part of the cross-section (the upper part of the Udinskaya suite, and the Aisinskaya suite) with sandstones and aleuritic sandstones. Gravelites and sandstones from the lower part of the Oselkovaya series show indicators of epigenetic changes that are less intensively expressed in the rocks from the upper part of the cross-section. The upper and lower parts of the Oselkovaya series are significantly different in terms of lithogeochemistry. The lower rocks show quite low contents of Na2O and ratios K2O/Na2O ranging between 10 and 75. In the terrigenous sediments of the upper part, values of K2O/Na2O do not exceed 1-2. Sandstones and gravelites in the lower part of the Oselkovaya series are characterized by reduced concentrations of radioactive, rare-earth, and highly charged elements, as well as lower concentrations of Ni and Co relative to concentrations of these elements in sandstones and aleuritic sandstones of the Oselkovaya series. The petrographic and lithogeochemical characteristics of the terrigenous sediments of the lower and upper parts of the Oselkovaya series suggest different sources of the denudation of these rocks into the sedimentation basin. It is suggested that acid rocks were the denudation source of the terrigenous rocks in the lower part of the series, and the sandstones and aleuritic sandstones in the upper part of the series were sourced from rocks of a mixed (acid-base) composition. The composition of the rocks in the source area was reconstructed, and the published ages of detrital zircons from the sandstones of the upper and lower parts of the Oselkovaya series were taken into account. The reconstruction suggests that the lower part of the Oselkovaya series resulted from the destruction of the basement rocks in the Siberian craton. The upper part of the Oselkovaya series seems to have formed in the basin, wherein the denudation took place from the orogen formed as a result of the accretion of micro-continents and island arcs of the Paleo-Asian Ocean to the south-western margin of the Siberian craton.

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Section: петрогенные элементыunclassified

Section: обсуждение результатовunclassified

Section: характеристика процессов палеовыветриванияunclassified

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The Composition and Reconstruction of the Source Area for the Late Precambrian Terrigenous Rocks of the Oselkovaya Series (Biryusa Prisayanie)

Motova¹,

Донская²,

Гладкочуб³

2016

Geodin. tektonofiz.

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“…Recently, Varga et al (2001Varga et al ( , 2002Varga et al ( , 2003Varga et al ( , 2007 and reported the mineralogical, petrographic, and chemical composition of these rocks. In this study we include data from clay mineralogical and bulk-rock geochemical analyses of sandstone, sandy siltstone, and conglomerate samples collected from the Upper Carboniferous Téseny Sandstone Formation (Slavonia-Drava Unit, Tisza Mega-unit, Hungary) to describe paleoweathering conditions.…”

Section: Introductionmentioning

confidence: 99%

Paleoweathering conditions of Upper Carboniferous siliciclastic rocks of SW Hungary

Varga¹,

Raucsik²,

Hartyáni³

et al. 2007

Central European Geology

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The clay mineralogical and chemical compositions of Upper Carboniferous siliciclastic rocks from the western flank of the Villány Mountains (Téseny Sandstone Formation) have been investigated to determine paleoweathering conditions, as well as to appraise the influence of the post-depositional processes upon source rock signature. The clay-mineral assemblage of the samples consists predominantly of illite±muscovite, suggesting a potassium metasomatism in the Téseny clastics. Therefore the use of the Chemical Index of Alteration (CIA), which provides a consistent quantitative framework for examining weathering, leads to erroneous conclusions without correction for Kmetasomatism. When considered in Al 2 O 3 -CaO*+Na 2 O-K 2 O (A-CN-K) compositional space, orthogneiss and igneous rock clasts selected from the Téseny conglomerate reflect two different weathering trends; one (including orthogneiss, quartz diorite, and andesite samples) shows an ideal trend observed for granodioritic rocks, and the other (including aplite, rhyodacite, and rhyolite samples) follows a trend from a slightly more K-feldspar-rich fresh rock composition than that of average granite. Intermediate to intense chemical weathering of the source areas is indicated by premetasomatized CIA values of 77-84 for the samples from borehole Siklósbodony-1, suggesting that these rocks have gained about 6-7% K 2 O (in A-CN-K space) during metasomatism.

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Provenance and Variscan low-grade regional metamorphism recorded in slates from the basement of the (SW Hungary)

Mészáros

Varga

Raucsik

et al. 2019

Int J Earth Sci (Geol Rundsch)

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A metapelitic sequence with Silurian protolith from the Horváthertelend Unit (Tisza Mega-unit, Hungary) has a K-white mica + chlorite + quartz + albite + anatase ± tourmaline mineral assemblage. Moderately developed disjunctive and welldeveloped continuous foliations are present. Geochemical results reflect a dominantly felsic source of the protoliths, suggesting an intermediate to acidic volcanic arc in the provenance area. Metasandstone pebbles in the metaconglomerate indicate a recycled sedimentary source. Raman spectroscopy of carbonaceous material indicates a ~ 350-370 °C peak metamorphic temperature. The Kübler Index (KI Basel ) values of the phengitic K-white mica indicate epizonal metamorphism (0.22 ± 0.04 Δ°2θ). The Chlorite 'Crystallinity' Index (ChC CIS ) suggests metamorphic alteration near to the anchizone-epizone boundary (0.31 ± 0.06 Δ°2θ). K-Ar ages of K-white mica are interpreted as a result of Variscan metamorphism (c. > 310 Ma) and post-Variscan uplift (c. 290 Ma). The predominance of lydite and slate of Llandoverian age and the overlying coarse-grained metagreywacke and metaconglomerate beds of the Szalatnak Slate Formation show strong lithological similarities with the proximal Silurian sequences in the Małopolska Massif (Kielce Region, Holy Cross Mountains, Poland). The original position of the Horváthertelend Unit is presumably to the northeast from the Bohemian Massif, next to the Upper Silesian Block (Moravo-Silesian Zone) and the Małopolska Terrane.

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Complex examination of the Upper Paleozoic siliciclastic rocks from southern Transdanubia, SW Hungary—Mineralogical, petrographic, and geochemical study

Cited by 11 publications

References 27 publications

The Composition and Reconstruction of the Source Area for the Late Precambrian Terrigenous Rocks of the Oselkovaya Series (Biryusa Prisayanie)

The Composition and Reconstruction of the Source Area for the Late Precambrian Terrigenous Rocks of the Oselkovaya Series (Biryusa Prisayanie)

Paleoweathering conditions of Upper Carboniferous siliciclastic rocks of SW Hungary

Provenance and Variscan low-grade regional metamorphism recorded in slates from the basement of the (SW Hungary)

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