Origin of minerals with intermediate chlorite-vermiculite structure (Szklary, Poland)

Wiewióra, Andrzej; Dubińska, Elżbieta

doi:10.1016/0009-2541(87)90124-0

Cited by 6 publications

(5 citation statements)

References 14 publications

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“…L'analyse des argiles par diffraction des rayons X en transmission sur préparations orientées a été pratiquée depuis une vingtaine d'années par plusieurs chercheurs, surtout issus des pays de l'Est [8,9,14]. Cette technique apporte un complément d'information très utile, notamment pour l'identification précise des variétés polytypiques, dont la signification géologique est importante (paléothermométrie et paléobarométrie).…”

Section: Resultsunclassified

“…Il faut un volume suffisant de matière, donc une épaisseur suffisante de la préparation, pour avoir une diffraction correcte, mais un compromis doit être trouvé pour éviter une absorption trop importante des RX. L'épaisseur optimale dépend à la fois du minéral étudié et de l'angle d'incidence [8], une épaisseur de l'ordre de 0,lmm paraît, dans la plupart des cas, acceptable. Les techniques de préparation varient selon le support utilisé (ou l'absence de support).…”

Section: Préparation De L'échantillonunclassified

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Utilisation du détecteur courbe multicanal INEL CPS 120 pour l'identification des phyllosilicates par diffraction des rayons X, en transmission, sur préparations orientées

Weber¹,

Blanc²,

Pflanz³

et al. 1996

J. Phys. IV France

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il est souvent difficile d'obtenir des diagrammes d'argiles de bonne qualité sur poudre désorientée par diffraction des rayons X, ce qui justifie la confection de préparations orientées selon les plans (001). Cependant, seules les analyses par transmission permettent d'accéder aux plans autres que les (000. Or la connaissance de l'équidistance de certains plans (hk/) est indispensable à l'identification précise des minéraux des argiles, en particulier à la détermination des variétés polytypiques des phyllosilicates. Le détecteur courbe INEL CPS 120, qui collecte simultanément les données de diffraction des rayons X surl20°-20 grâce à un compteur multicanal (2 "• = 4096 canaux) est bien adaptée aux analyses par transmission, il a été utilisé pour l'analyse par transmission de préparations orientées d'argile. Deux exemples illustrent la possibilité d'identifier les polytypes de l'illite par cette méthode.

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Section: Resultsunclassified

Section: Préparation De L'échantillonunclassified

Utilisation du détecteur courbe multicanal INEL CPS 120 pour l'identification des phyllosilicates par diffraction des rayons X, en transmission, sur préparations orientées

Weber¹,

Blanc²,

Pflanz³

et al. 1996

J. Phys. IV France

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“…The formation of chlorite-like phases is probably a result of selective dissolution of a metalhydroxy layer of chlorite (e.g. Carnicelli et al, 1997;Churchman, 1980;Righi et al, 1993;Ruiz Cruz, 1999;Ruiz Cruz & Novák, 2003;Wiewióra, 1978;Wiewióra & Dubińska, 1987). The greenschist-facies metamorphism of the metabasic rocks is confirmed by the occurrence of chlorite-actinolitetalc-albite assemblage in metabasic rocks from the neighbouring drill core, Kotusz-1.…”

Section: Mafic Rocksmentioning

confidence: 97%

“…Chlorite phases can be subject to decomposition during metamorphic processes or weathering (Carnicelli et al, 1997;Churchman, 1980;Righi et al, 1993;Nieto et al, 1994Nieto et al, , 2005Wiewióra & Dubińska, 1987). They can indicate metamorphic retrogression in very low-temperature processes and the presence of acidic fluids.…”

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confidence: 99%

Clay minerals from Permo-Carboniferous very low-grade metamorphic rocks from the central part of the Fore Sudetic Monocline (western Poland)

et al. 2008

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The mafic rocks from boreholes studied here contain the assemblage typical for upper-subgreenschist to lower-greenschist facies (albite, chlorite, illite, titanite, quartz, Ti-oxide ± actinolite) as well as relict clinopyroxene.Metapelites underlying a metabasic rock sequence also record metamorphic alteration as demonstrated by the chlorite and illite crystallinities. Chlorite crystallinity suggests formation in conditions close to the subgreenschist/greenschist facies boundary, but this mineral is partly decomposed during metamorphic retrogression.

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“…Moreover, such vermiculites, on saturation with K + ions, readily revert to the polytype of the parent mica (de la Calle et aL, 1975). Identification of the parent mineral using X-ray oblique transmission diffractometry (Wiewiora & Weiss, 1985) was successfully applied by Wiewiora & Dubinska (1987) to intergrades from Szklary (Poland). K-saturated vermiculites from Jordanow readily produced the structure of trioctahedral mica (polytype lAfA-I -3 r A-IV); thus they are presumably formed from micas.…”

Section: Origin O F the Vermiculitementioning

confidence: 99%

Layer-silicates in the contact zone between granite and serpentinite, jordanów, lower Silesia, Poland

Dubińska

Wiewióra

1988

Clay miner.

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Chlorite belonging to subfamily C, vermiculite 2MB-VlI-meso, talc and a monoclinic amphibole were identified in rocks from a contact zone between highly tectonized granite and serpentinite at Jordan6w, Lower Silesia, Poland. K-saturated vermiculite readily produced a phlogopite-like structure 1M-I (3TA-IV) indicating trioctahedral mica to be its precursor. Spatial relations of the mineral assemblages were compared with published experimental data and used to produce a tentative model of the geological evolution of the rocks and minerals, which include four episodes of mineral development separated by three tectonic events.Materials from a small quarry near Jordan6w, in the eastern part of the Jordan6w-Gogot6w serpentinite massif (Lower Silesia, Poland) have been extensively studied for the last 100 years with particular attention on nephrite and calc-silicate rocks and minerals. The origin of these rocks and minerals is still controversial, however, and in the latest papers (e.g. Heflik, 1982) the rocks are considered to be rodingites or rodingite-like rocks developed at the expense of gabbroic dykes. Chlorite, smectite and talc, concomitant with calc-silicate rocks from Jordan6w, were assumed to be products of amphibole alteration and form a sequence: actinolite-,talc--,smectite-ochlorite (Heflik, 1967). This sequence seems to contradici conclusions on the evolution of the calc-silicate rocks from Jordan6w, especially those dealing with the remarkable influence of retrogression (Heflik, op. cit.). The purpose of this paper is to supply additional information on the genesis of the rocks from Jordan6w from detailed study of layer-silicates, which are susceptible to variations in physico-chemical conditions. MATERIALS AND METHODSRocks rich in layer-silicates (apart from the serpentinites) form veins up to 1.5 m thick, extending ~ 20 m (Fig. 1) and filling fissures in highly tectonized leucogranite, where they form flakes with minor acicular monoclinic amphibole. The composition of the veins changes gradually, amphibole becoming more abundant and, in the zone between the calc-silicate rocks and serpentinite, the veins consist mainly of the amphibole, with a minor admixture of other minerals in places. 1988 The Mineralogical Society

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Origin of minerals with intermediate chlorite-vermiculite structure (Szklary, Poland)

Cited by 6 publications

References 14 publications

Utilisation du détecteur courbe multicanal INEL CPS 120 pour l'identification des phyllosilicates par diffraction des rayons X, en transmission, sur préparations orientées

Utilisation du détecteur courbe multicanal INEL CPS 120 pour l'identification des phyllosilicates par diffraction des rayons X, en transmission, sur préparations orientées

Clay minerals from Permo-Carboniferous very low-grade metamorphic rocks from the central part of the Fore Sudetic Monocline (western Poland)

Layer-silicates in the contact zone between granite and serpentinite, jordanów, lower Silesia, Poland

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