Conodont colour alteration indices: Palaeotemperatures and metamorphism in the Northern Calcareous Alps ? a general view

Gawlick, Hans‐Jürgen; Krystyn, Leopold; Lein, Richard

doi:10.1007/bf01083235

Cited by 38 publications

(40 citation statements)

References 9 publications

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“…A regional study of illite "crystallinity" measurements identified an anchimetamorphic overprint along much of its southern rim with a general trend toward lower paleotemperatures to the north as well as from bottom to top within the nappe pile (Kralik et al 1987b). A more recent study based on the conodont color alteration index (CAI) suggested this to be an oversimplistic view (Gawlick et al 1994). This study recognized two main tectonic units of different paleothermal regime within the central and eastern portion of the NCA: the "cool" Tirolicum and the variably "hot" Juvavicum.…”

Section: Geologic Settingmentioning

confidence: 95%

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

Spötl

Hasenhüttl

1998

Geologische Rundschau

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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% R o , 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.

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Section: Geologic Settingmentioning

confidence: 95%

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

Spötl

Hasenhüttl

1998

Geologische Rundschau

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“…The maximum temperature is inferred to have not exceeded 50 °C based on local palynomorph and conodont (CAI, Conodont Alteration Index = 1) preservation (Hillebrandt et al 2013;Kuerschner et al 2007). Regionally, similar CAI values of 1 in the Tirolic units of the central Northern Calcareous Alps are thought to correspond to temperature ranges of 50-80 °C (Gawlick et al 1994), whereas palynomorph preservation from another locality in the Eiberg basin suggest a maximum of 65 °C ).…”

Section: Geological Settingmentioning

confidence: 98%

“…faulted at both the nearby Hochalplgraben section and in the Eiberg quarry (Hillebrandt et al 2013). Its true thickness is, therefore, difficult to determine: according to Gawlick et al (2009), it is typically 1-3 m but locally may reach up to 7 m, whereas Furrer (1993) reports common thickness values of 6-10 m in the western Lechtal nappe. The greatest known thickness measured during construction of a tunnel in the Allgäu nappe is ca.…”

mentioning

confidence: 99%

Structural complexity at and around the Triassic–Jurassic GSSP at Kuhjoch, Northern Calcareous Alps, Austria

Palotai

Pálfy²,

Sasvári

2017

Int J Earth Sci (Geol Rundsch)

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“…360-400°C, e.g. Nöth 1991Jones 1992;Burnett et al 1994;Gawlick et al 1994) from Lini section (Pelagonian units). The conodonts are derived from cherty metalimestones.…”

Section: Relative Timing Of Ocean Floor Formation and Destructionmentioning

confidence: 98%

Mirdita Zone ophiolites and associated sediments in Albania reveal Neotethys Ocean origin

Gawlick

Frisch

Hoxha

et al. 2007

Int J Earth Sci (Geol Rundsch)

159

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The Mirdita Ophiolite Zone in Albania is associated with widespread mélanges containing components of up to nappe-size. We dated matrix and components of the mélange by radiolarians, conodonts, and other taxa. The components consist of radiolarites, pelagic limestones and shallow-water limestones, all of Triassic age, as well as ophiolites. Triassic radiolarite as a primary cover of ophiolite material proves Middle Triassic onset of Mirdita ocean-floor formation. The mélange contains a turbiditic radiolarite-rich matrix (''radiolaritic flysch''), dated as Late Bajocian to Early Oxfordian. It formed as a synorogenic sediment during west-directed thrusting of ophiolite and sediment-cover nappes representing ocean floor and underplated fragments of the western continental margin. The tectonic structures formed during these orogenic events (''Younger Kimmeridian or Eohellenic Orogeny'') are sealed by Late Jurassic platform carbonates. The geological history conforms with that of the Inner Dinarides and adjoining areas; we therefore correlate the Mirdita-Pindos Ophiolite Zone with the Vardar Zone and explain its present position by far-distance west-directed thrusting.

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Conodont colour alteration indices: Palaeotemperatures and metamorphism in the Northern Calcareous Alps ? a general view

Cited by 38 publications

References 9 publications

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

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

Structural complexity at and around the Triassic–Jurassic GSSP at Kuhjoch, Northern Calcareous Alps, Austria

Mirdita Zone ophiolites and associated sediments in Albania reveal Neotethys Ocean origin

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