3-D assessment of peak-metamorphic conditions by Raman spectroscopy of carbonaceous material: an example from the margin of the Lepontine dome (Swiss Central Alps)
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3-D assessment of peak-metamorphic conditions by Raman spectroscopy of carbonaceous material: an example from the margin of the Lepontine dome (Swiss Central Alps). / Wiederkehr, Michael; Bousquet, Romain; Ziemann, Martin; Berger, Alfons; Schmid, Stefan.
I: International Journal of Earth Sciences, Bind 100, 21.01.2011, s. 1029-1063.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - 3-D assessment of peak-metamorphic conditions by Raman spectroscopy of carbonaceous material: an example from the margin of the Lepontine dome (Swiss Central Alps)
AU - Wiederkehr, Michael
AU - Bousquet, Romain
AU - Ziemann, Martin
AU - Berger, Alfons
AU - Schmid, Stefan
PY - 2011/1/21
Y1 - 2011/1/21
N2 - This study monitors regional changes in thecrystallinity of carbonaceous matter (CM) by applyingMicro-Raman spectroscopy to a total of 214 metasedimentsamples (largely so-called Bu¨ndnerschiefer) dominantlymetamorphosed under blueschist- to amphibolite-faciesconditions. They were collected within the northeasternmargin of the Lepontine dome and easterly adjacent areasof the Swiss Central Alps. Three-dimensional mapping ofisotemperature contours in map and profile views showsthat the isotemperature contours associated with the MioceneBarrow-type Lepontine metamorphic event cut acrossrefolded nappe contacts, both along and across strikewithin the northeastern margin of the Lepontine dome andadjacent areas. Further to the northeast, the isotemperaturecontours reflect temperatures reached during the LateEocene subduction-related blueschist-facies event and/orduring subsequent near-isothermal decompression; thesecontours appear folded by younger, large-scale post-nappestackingfolds. A substantial jump in the recorded maximumtemperatures across the tectonic contact between thefrontal Adula nappe complex and surrounding metasedimentsindicates that this contact accommodated differentialtectonic movement of the Adula nappe with respect to theenveloping Bu¨ndnerschiefer after maximum temperatureswere reached within the northern Adula nappe, i.e. afterLate Eocene time.
AB - This study monitors regional changes in thecrystallinity of carbonaceous matter (CM) by applyingMicro-Raman spectroscopy to a total of 214 metasedimentsamples (largely so-called Bu¨ndnerschiefer) dominantlymetamorphosed under blueschist- to amphibolite-faciesconditions. They were collected within the northeasternmargin of the Lepontine dome and easterly adjacent areasof the Swiss Central Alps. Three-dimensional mapping ofisotemperature contours in map and profile views showsthat the isotemperature contours associated with the MioceneBarrow-type Lepontine metamorphic event cut acrossrefolded nappe contacts, both along and across strikewithin the northeastern margin of the Lepontine dome andadjacent areas. Further to the northeast, the isotemperaturecontours reflect temperatures reached during the LateEocene subduction-related blueschist-facies event and/orduring subsequent near-isothermal decompression; thesecontours appear folded by younger, large-scale post-nappestackingfolds. A substantial jump in the recorded maximumtemperatures across the tectonic contact between thefrontal Adula nappe complex and surrounding metasedimentsindicates that this contact accommodated differentialtectonic movement of the Adula nappe with respect to theenveloping Bu¨ndnerschiefer after maximum temperatureswere reached within the northern Adula nappe, i.e. afterLate Eocene time.
U2 - 10.1007/s00531-010-0622-2
DO - 10.1007/s00531-010-0622-2
M3 - Journal article
VL - 100
SP - 1029
EP - 1063
JO - International Journal of Earth Sciences
JF - International Journal of Earth Sciences
SN - 1437-3254
ER -
ID: 32648630