The evolution of illite to muscovite: mineralogical and isotopic data from the Glarus Alps, Switzerland

Hunziker, J. C.; Frey, Martin; Clauer, Norbert; Dallmeyer, R. D.; Friedrichsen, Hans; Flehmig, Werner; Hochstrasser, K.; Roggwiler, P.; Schwander, H.

doi:10.1007/bf00375291

Cited by 308 publications

(186 citation statements)

References 31 publications

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“…1M ? 2M 1 (Hunziker et al 1986). Generally, illite has 1 M d and 1 M polytypes in a diagenetic zone, a mixture of 1M and 2M 1 polytypes in the anchizone and sole 2M 1 polytypes in the epizone (e.g.…”

Section: Mineralogy and K-ar Dating Of Fault Gougesmentioning

confidence: 99%

Exhumation and uplift of the Sierras Pampeanas: preliminary implications from K–Ar fault gouge dating and low-T thermochronology in the Sierra de Comechingones (Argentina)

Löbens

Bense

Wemmer

et al. 2010

Int J Earth Sci (Geol Rundsch)

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The Sierras Pampeanas in central and northwestern Argentina constitute a distinct morphotectonic feature between 27°S and 33°S. The last stage of uplift and deformation in this area are interpreted to be closely related to the Andean flat-slab subduction of the Nazca plate beneath the South American plate. K-Ar fault gouge dating and low-temperature thermochronology along two transects within the Sierra de Comechingones reveal a minimum age for the onset of brittle deformation about 340 Ma, very low exhumation rates since Late Paleozoic time, as well as a total exhumation of about 2.3 km since the Late Cretaceous. New Ar-Ar ages (7.54-1.91 Ma) of volcanic rocks from the San Luis volcanic belt support the eastward propagation of the flat-slab magmatic front, confirming the onset of flat-slab related deformation in this region at 11.2 Ma. Although low-temperature thermochronology does not clearly constrain the signal of the Andean uplift, it is understood that the current structural relief related to the Comechingones range has been achieved after the exhumation of both fault walls (circa 80-70 Ma).

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Section: Mineralogy and K-ar Dating Of Fault Gougesmentioning

confidence: 99%

Exhumation and uplift of the Sierras Pampeanas: preliminary implications from K–Ar fault gouge dating and low-T thermochronology in the Sierra de Comechingones (Argentina)

Löbens

Bense

Wemmer

et al. 2010

Int J Earth Sci (Geol Rundsch)

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“…43 from Coire Dhuinnid have yielded the following ages: 482_+3 Ma (Ar-Ar dating on Cr illite); 413 _+ 12 Ma (K-Ar dating on Cr illite): and 322_+9 Ma (Rb-Sr dating on Cr illite-clinochlore-whole rock). This discordance is not surprising because the 1M nature of the chromian illite and the presence of ~<10% of interstratified illite-smectite indicate a crystallization temperature of c. 175 200~ (Walker and Thompson, 1990, p. 317;Jennings and Thompson, 1986, p. 92) that is well below the anchizone-epizone boundary (T, c. 280_+30~ (Bucher and Frey, 1994, p. 272)) near which K-Ar and Rb-Sr data and the Ar-Ar release spectra are concordant (Hunziker et al, 1986). A very low temperature is also confirmed by the complete replacement of feldspar by kaolinite in Zones B and C, and by the high IC of 0.74 of the chromian illite that indicates crystallization in the diagenetic zone [zeolite facies] (Merriman et al, 1990, p. 37;Warr, 1996).…”

Section: Discussionmentioning

confidence: 99%

Chromian Illite-Ankerite-Quartz Parageneses from the Kintail District of Southern Ross-Shire, Scotland

Clifford¹

1999

Mineralogical Magazine

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The Coire Dhuinnid fault zone contains emerald green chromian illite-ankerite-quartz rocks that are similar in appearance to the fuchsite(or mariposite)-carbonate-quartz parageneses that are commonplace in Archaean greenstone belts but which are rather rare in Phanerozoic rocks. The chromian illite contains 2.3 wt.% Cr20> low K20 (7.1 7.6 wt.%) and high H20+ (5.7 wt.%), and it is a 1M polytype with ~<10% of an illite/smectite interstratification indicative of a formation temperature of c. 175-200~ The host rocks contain high concentrations of Ni and Cr, and show low concentrations of Ti, Nb, Y and Zr, suggesting a tbrmer primitive mafic protolith (boninitic magma?); they are considered to be retrograde remnants of Lewisian rocks. The latter, and the associated rocks of the Moine Series, have been affected by CO2 metasomatism that was accompanied by the addition of Ca(+Sr), Fe and Mg, and by the removal of Na from, and the addition of H20 to the Moine metasediments. Radiogenic isotope studies of mineral separates and whole rock from sample no. 43 yielded ages of 483_+2 Ma (Ar-Ar dating on Cr illite), 413_+ 12 Ma (K-Ar dating on Cr illite), and 322 + 9 Ma (Rb-Sr dating on minerals and whole rock); the significance of this discrepant pattern is discussed.

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“…When evaluating and interpreting the K-Ar data in order to determine the age of the metamorphism, a possible influence of the detrital material should be taken into consideration (Hunziker et al 1986). The effect of the detritus was tested by dating different mineral grain fractions ( < 0.5 µm and < 2 µm) including the whole rock.…”

Section: Chronology Of Metamorphismmentioning

confidence: 99%

Eoalpine (Cretaceous) very low- to low-grade metamorphism recorded on the illite-muscovite-rich fraction of metasediments from South Tisia (eastern Mt Papuk, Croatia)

Biševac¹,

Balogh²,

Balen³

et al. 2010

Geologica Carpathica

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Eoalpine very low-to low-grade metamorphism related to Cretaceous orogenesis has been investigated in the Slavonian Mts, Croatia. Samples belonging to the Psunj metamorphic complex (PMC), the Radlovac metamorphic complex (RMC) and Permian-Triassic and Triassic sedimentary sequences (PTSS) were studied. The Kübler and Árkai indices of all the analysed samples indicate high-anchizonal to epizonal metamorphism. The degree of Eoalpine metamorphism tends to be constant in all samples implying that the different complexes passed through and recorded the same event. Measurements of illite-white K-mica b 0 -parameter of the RMC samples imply transitional low-to mediumpressure character of the metamorphism. These data together with K-Ar ages (~100-80 Ma) measured on illite-white K-mica rich < 2 m grain-size fractions point to Late Cretaceous very low-to low-grade regional metamorphism presumably related to the main nappe-forming compressional events in the Pannonian Basin and the Carpathians. The P-T-t (pressure-temperature-time) evolution of the studied area is in good agreement with similar scenarios in the surrounding areas of Tisia, but also in Eastern Alps, Carpathians and Pannonian Basin (ALCAPA).

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The evolution of illite to muscovite: mineralogical and isotopic data from the Glarus Alps, Switzerland

Cited by 308 publications

References 31 publications

Exhumation and uplift of the Sierras Pampeanas: preliminary implications from K–Ar fault gouge dating and low-T thermochronology in the Sierra de Comechingones (Argentina)

Exhumation and uplift of the Sierras Pampeanas: preliminary implications from K–Ar fault gouge dating and low-T thermochronology in the Sierra de Comechingones (Argentina)

Chromian Illite-Ankerite-Quartz Parageneses from the Kintail District of Southern Ross-Shire, Scotland

Eoalpine (Cretaceous) very low- to low-grade metamorphism recorded on the illite-muscovite-rich fraction of metasediments from South Tisia (eastern Mt Papuk, Croatia)

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