NDLI: Thermal history of the evaporitic Haselgebirge mélange in the Northern Calcareous Alps (Austria)

Content Provider	Springer Nature Link
Author	Spötl, C. Hasenhüttl, C.
Copyright Year	1998
Abstract	In the central and eastern part of the Northern Calcareous Alps, Upper Permian evaporitic rocks form a tectonic mélange whose distribution is restricted largely to the topmost thrust unit (Juvavicum). Mudrock and dolostone samples associated with the evaporites in ten major outcrops (mostly mines) were examined in order to constrain the paleothermal conditions of the mélange. Measurements of illite "crystallinity" reveal a regionally variable pattern of metamorphic grade ranging from diagenesis to the high anchizone and possibly epizone. Most samples contained very little organic matter and vitrinite particles were rare. Samples containing vitrinite show consistent minimum reflectance values of ∼1.3–1.7% Ro, whereas maximum reflectance values are more variable (up to 4.9%). The former data constrain the minimum burial temperatures to ∼160–180°C. The observed variability in illite "crystallinity" and organic maturity both between and within individual outcrops is consistent with the mélange architecture of this unit and is in good agreement with the regional thermal pattern recognized in Middle to Upper Triassic carbonate formations within the Juvavicum by conodont color alteration studies. Mélange formation and heating of the evaporites is suggested to be linked to the Upper Jurassic closure of the Meliata-Hallstatt Ocean and subsequent thrusting of obducted terranes (Juvavicum) into the depositional realm of the Northern Calcareous Alps.
Starting Page	449
Ending Page	460
Page Count	12
File Format	PDF
ISSN	00167835
Journal	International Journal of Earth Sciences
Volume Number	87
Issue Number	3
e-ISSN	14321149
Language	English
Publisher	Springer-Verlag
Publisher Date	1998-12-14
Publisher Place	Berlin, Heidelberg
Access Restriction	Subscribed
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences

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Thermal history of the evaporitic Haselgebirge mélange in the Northern Calcareous Alps (Austria)

The Haselgebirge evaporitic mélange in central Northern Calcareous Alps (Austria): Part of the Permian to Lower Triassic rift of the Meliata ocean?

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Thermal history of the evaporitic Haselgebirge mélange in the Northern Calcareous Alps (Austria)

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