Time calibration of a PT-path from the Western Tauern Window, Eastern Alps: the problem of closure temperatures

Blanckenburg, Friedhelm von; Villa, Igor M.; Baur, H.; Morteani, G.; Steiger, R.

doi:10.1007/bf00387196

Cited by 242 publications

(127 citation statements)

References 29 publications

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“…The formula and the parameters suggested by Dodson (1973) and Robbins (1972), respectively, were used to calculate the closure temperatures. These temperatures are consistent with the previously reported retention temperatures of 350 -430 °C for white mica (Purdy and Jäger, 1976;McDougall and Harrison, 1988;Blanckenburg et al, 1989;Kirschner et al, 1996). The peak metamorphic conditions of the high -P/T metamorphic rocks of the Heilongjiang Complex have been estimated by Bai et al (1988).…”

supporting

confidence: 81%

40Ar/39Ar ages of the high-P/T metamorphic rocks of the Heilongjiang Complex in the Jiamusi Massif, northeastern China

Liu¹,

Takasu²,

Liu

et al. 2009

Journal of Mineralogical and Petrological Sciences

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supporting

confidence: 81%

40Ar/39Ar ages of the high-P/T metamorphic rocks of the Heilongjiang Complex in the Jiamusi Massif, northeastern China

Liu¹,

Takasu²,

Liu

et al. 2009

Journal of Mineralogical and Petrological Sciences

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“…20 to 14 Ma. Hence, cooling by heat conduction and possibly also by convecting fluids dominated over exhumation related upward advection of heat, arguing for a decrease of exhumation rates during that period as suggested by von Blanckenburg et al (1989).…”

Section: Resultsmentioning

confidence: 83%

Mapping of the post-collisional cooling history of the Eastern Alps

Lüth

Willingshofer

2008

Swiss J. Geosci.

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We present a database of geochronological data documenting the post-collisional cooling history of the Eastern Alps. This data is presented as (a) georeferenced isochrone maps based on Rb/Sr, K/Ar (biotite) and fission track (apatite, zircon) dating portraying cooling from upper greenschist/amphibolite facies metamorphism (500-600 °C) to 110 °C, and (b) as temperature maps documenting key times (25, 20, 15, 10 Ma) in the cooling history of the Eastern Alps. These cooling maps facilitate detecting of cooling patterns and cooling rates which give insight into the underlying processes governing rock exhumation and cooling on a regional scale.The compilation of available cooling-age data shows that the bulk of the Austroalpine units already cooled below 230 °C before the Paleocene. The onset of cooling of the Tauern Window (TW) was in the Oligocene-Early Miocene and was confined to the Penninic units, while in the Middle-to Late Miocene the surrounding Austroalpine units cooled together with the TW towards near surface conditions. High cooling rates (50 °C/Ma) within the TW are recorded for the temperature interval of 375-230 °C and occurred from Early Miocene in the east to Middle Miocene in the west. Fast cooling post-dates rapid, isothermal exhumation of the TW but was coeval with the climax of lateral extrusion tectonics. The cooling maps also portray the diachronous character of cooling within the TW (earlier in the east by ca. 5 Ma), which is recognized within all isotope systems considered in this study.Cooling in the western TW was controlled by activity along the Brenner normal fault as shown by gradually decreasing ages towards the Brenner Line. Cooling ages also decrease towards the E-W striking structural axis of the TW, indicating a thermal dome geometry. Both cooling trends and the timing of the highest cooling rates reveal a strong interplay between E-W extension and N-S orientated shortening during exhumation of the TW.

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“…The age spectra of samples and KJCa profi les are ShUWll in Figure 5 (see also (Blakenburg et al 1989;Hames et al 1994;Kirschner et al 1996). Others have expressed doubts as to the universal applic ability of the closure temperature concept (Vi11a 1998).…”

Section: Resultsmentioning

confidence: 99%

⁴⁰ Ar/ ³⁹ Ar laserprobe dating of mylonitic fabrics in a polyorogenic terrane of NW Iberia

Barreiro

Wijbrans

Castiñeiras

et al. 2006

JGS

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The tectonothennal evolution of a polyorogenic terrane in the Variscan belt of NW Spain has been constrained by 40 Ar/ 3 9 Ar laserprobe incremental heating experiments on mylonitic f � brics developed in major structures. Transitional levels between HP-HT and IP upper lUlits in the Ordenes Complex where metamorphic and structural records demonstrate two cycles of burial and exhlUllation were selected for dating. Two groups of ages have been defined: (1) Silurian-Early Devonian, obtained from mylonites of the Fomas extensional detachment, here considered as the minimlUll age for the start of tectonic exhlUllation of the HP HT lUlits and an upper age-limit for the HP-HT event itself; (2) Early to Mid-Devonian, from structures related to the Variscan convergence in the area, which include top-to-the-east thrusts and extensional detachments. A single, YOlUlger Carboniferous age obtained from the uppennost allochthonous sequences possibly reflects the final stages of emplacement of the allochthonous complexes. Our data indicate a polyorogenic character for a part of the Iberian allochthonous complexes, including Variscan (sensu stricto)and Early Variscan convergence, as well as an older, Early Palaeozoic cycle.

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Time calibration of a PT-path from the Western Tauern Window, Eastern Alps: the problem of closure temperatures

Cited by 242 publications

References 29 publications

40Ar/39Ar ages of the high-P/T metamorphic rocks of the Heilongjiang Complex in the Jiamusi Massif, northeastern China

40Ar/39Ar ages of the high-P/T metamorphic rocks of the Heilongjiang Complex in the Jiamusi Massif, northeastern China

Mapping of the post-collisional cooling history of the Eastern Alps

⁴⁰ Ar/ ³⁹ Ar laserprobe dating of mylonitic fabrics in a polyorogenic terrane of NW Iberia

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Time calibration of a PT-path from the Western Tauern Window, Eastern Alps: the problem of closure temperatures

Cited by 242 publications

References 29 publications

40Ar/39Ar ages of the high-P/T metamorphic rocks of the Heilongjiang Complex in the Jiamusi Massif, northeastern China

40Ar/39Ar ages of the high-P/T metamorphic rocks of the Heilongjiang Complex in the Jiamusi Massif, northeastern China

Mapping of the post-collisional cooling history of the Eastern Alps

40 Ar/ 39 Ar laserprobe dating of mylonitic fabrics in a polyorogenic terrane of NW Iberia

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⁴⁰ Ar/ ³⁹ Ar laserprobe dating of mylonitic fabrics in a polyorogenic terrane of NW Iberia