Secondary Ca–Al silicates in plutonic rocks: implications for their cooling history

Freiberger, R.; Hecht, Lutz; Cuney, Michel; Morteani, G.

doi:10.1007/s004100100241

Cited by 26 publications

(34 citation statements)

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“…2A,B). In all samples, fractured wall rocks show primarily a widespread and pervasive alteration stage, postdating early retrograde assemblages (Ca-silicates;Freiberger et al, 2001a). This alteration stage corresponds to the largest alteration halos, frequently along major fractures in highly fractured plutonites.…”

Section: Geological Setting and Sample Descriptionmentioning

confidence: 98%

Dating multistage paleofluid percolations: A K-Ar and 18O/16O study of fracture illites from altered Hercynian plutonites at the basement/cover interface (Poitou High, France)

Cathelineau

Fourcade

Clauer

et al. 2004

Geochimica et Cosmochimica Acta

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Section: Geological Setting and Sample Descriptionmentioning

confidence: 98%

Dating multistage paleofluid percolations: A K-Ar and 18O/16O study of fracture illites from altered Hercynian plutonites at the basement/cover interface (Poitou High, France)

Cathelineau

Fourcade

Clauer

et al. 2004

Geochimica et Cosmochimica Acta

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“…The Oberpfalz region (including the Steinwald and the southern Fichtelgebirge, i.e. A hydrous mineralogy consisting of amphibole and biotite (both Mg-rich but notably low in Al), plagioclase (An 40 -An 30 ), minor amounts of quartz, K-feldspar, pyroxene, titanite, and apatite as well as early post-magmatic Ca-Al alteration minerals is typical (Troll 1968;Freiberger et al 2001). 1).…”

Section: Geological Backgroundmentioning

confidence: 99%

Late-Variscan magmatism revisited: new implications from Pb-evaporation zircon ages on the emplacement of redwitzites and granites in NE Bavaria

Siebel¹,

Chen²,

Satır³

2003

Int J Earth Sci (Geol Rundsch)

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Pb-evaporation zircon analyses coupled with a detailed cathodoluminescence (CL) study on the complete series of granitoids from the northern Oberpfalz, NE Bavaria, provide new evidence for the commencement and timing of late-Variscan magmatism. All granitoids analysed in this study were dated before by Rb-Sr and/or K-Ar methods. Investigated samples comprise medium-grained, I-type dioritic rocks (redwitzites), I/Stype granites (Leuchtenberg, Marktredwitz (G1), Zainhammer) and S-type granites (Falkenberg, Liebenstein, Mitterteich, Friedenfels, Steinwald, Flossenbürg, Bärnau). The zircon evaporation technique reveals three groups of 207 Pb/ 206 Pb ages which are interpreted to represent magmatic crystallisation: (1) ages of 324-321 Ma are found in all analysed redwitzites and in almost all I/S-type granites; (2) the granites of Falkenberg and Liebenstein yield ages of ~315 Ma; (3) ages between 312 and 310 Ma are recorded in the Mitterteich, Friedenfels, Steinwald and Flossenbürg granites. Titanite crystals from different redwitzite bodies yield conventional U-Pb ages of 325-322 Ma, identical to the Pb-evaporation zircon data of these rocks. The S-type granites of groups 2 and 3 contain zircons with relict cores but only a small number of them yield older ages, indicating that some of the cores must have lost their radiogenic Pb. From the geochronological data, we infer that metamorphic conditions of the Variscan crust produced different granite types at different times. The data support a model involving an early period of mantle-related magmatism which postdates the final convergence stage of the Variscan orogen. This magmatic activity was at the same time as the thermal peak of regional metamorphism and is followed by a late period of crustal anatexis, which is probably related to post-collisional extension of the thickened Variscan crust.

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“…In both places, the pistacitic component in the analysed epidotes show no compositional gap, consistent with relatively HP/HT condi tions during metamorphism, probably within amphibolite fades (e.g. Caruso et al 1988, Freiberger et al 2001. Significantly, the epi dotes from Fournas, on a Fe ( vs. AI VI diagram, form a well defined trend, indicative for prove nance from a unique source rock, and are strongly compared to epidotes from the Koziakas ophiolite (Fig.…”

Section: Garnetsmentioning

confidence: 77%

Provenance of Pindos Flysch Deposits in Metsovo and Fourna Areas Using Scanning Electron Microscopy and Microanalysis

et al. 2004

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Pétrographie observation of sandstones that contain detrital grains and lithic fragments along with microanalytical data from certain minerals suggest that detrital material in Pindos flysch deposits, in Metsovo and Fourna areas, may have been sourced in the Pindos ophiolite and the Pelagonian metamorphic rocks; additionally some material from Fournas has probably been derived from the Koziakas ophiolite outcrop. The Loumnitsa Unit (Pindos ophiolite), has probably supplied the Pindos foreland with ma+erial from the erosion of amphibolites while the Dramala Unit was the most probable source of spinels and ultramafic material. Fragments of acid plutonio rocks have been observed, too, owing their origin from the plutonite of Vamounta-Kastoria (Pelagonian Zone). The area of Fourna has been also fed by the Koziakas ophiolites, as evidenced from the composition of chlorites and epidotes.

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Secondary Ca–Al silicates in plutonic rocks: implications for their cooling history

Cited by 26 publications

References 0 publications

Dating multistage paleofluid percolations: A K-Ar and 18O/16O study of fracture illites from altered Hercynian plutonites at the basement/cover interface (Poitou High, France)

Dating multistage paleofluid percolations: A K-Ar and 18O/16O study of fracture illites from altered Hercynian plutonites at the basement/cover interface (Poitou High, France)

Late-Variscan magmatism revisited: new implications from Pb-evaporation zircon ages on the emplacement of redwitzites and granites in NE Bavaria

Provenance of Pindos Flysch Deposits in Metsovo and Fourna Areas Using Scanning Electron Microscopy and Microanalysis

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