TY  - JOUR
A1  - Wiederkehr, Michael
A1  - Bousquet, Romain
A1  - Ziemann, Martin Andreas
A1  - Berger, Alfons
A1  - Schmid, Stefan M.
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)
T2  - International journal of earth sciences
N2  - This study monitors regional changes in the crystallinity of carbonaceous matter (CM) by applying Micro-Raman spectroscopy to a total of 214 metasediment samples (largely so-called Bundnerschiefer) dominantly metamorphosed under blueschist- to amphibolite-facies conditions. They were collected within the northeastern margin of the Lepontine dome and easterly adjacent areas of the Swiss Central Alps. Three-dimensional mapping of isotemperature contours in map and profile views shows that the isotemperature contours associated with the Miocene Barrow-type Lepontine metamorphic event cut across refolded nappe contacts, both along and across strike within the northeastern margin of the Lepontine dome and adjacent areas. Further to the northeast, the isotemperature contours reflect temperatures reached during the Late Eocene subduction-related blueschist-facies event and/or during subsequent near-isothermal decompression; these contours appear folded by younger, large-scale post-nappe-stacking folds. A substantial jump in the recorded maximum temperatures across the tectonic contact between the frontal Adula nappe complex and surrounding metasediments indicates that this contact accommodated differential tectonic movement of the Adula nappe with respect to the enveloping Bundnerschiefer after maximum temperatures were reached within the northern Adula nappe, i.e. after Late Eocene time.
KW  - HP-metamorphism
KW  - Barrovian metamorphism
KW  - Graphitization
KW  - Metasediments
KW  - Micro-Raman spectroscopy
KW  - Central Alps
Y1  - 2011
UR  - https://publishup.uni-potsdam.de/frontdoor/index/index/docId/36780
SN  - 1437-3254
VL  - 100
IS  - 5
SP  - 1029
EP  - 1063
PB  - Springer
CY  - New York
ER  -