期刊
TERRA NOVA
卷 26, 期 2, 页码 130-138出版社
WILEY
DOI: 10.1111/ter.12079
关键词
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资金
- French Agence Nationale de la Recherche project [ANR-08-BLAN-0303-01]
- SUBDEF [ANR-08-BLAN-0192]
- Labex [OSUG2020]
Pressure-Temperature-time (P-T-t) estimates of the syn-kinematic strain at the peak-pressure conditions reached during shallow underthrusting of the Brianconnais Zone in the Alpine subduction zone was made by thermodynamic modelling and 40Ar/39Ar dating in the Plan-de-Phasy unit (SE of the Pelvoux Massif, Western Alps). The dated phengite minerals crystallized syn-kinematically in a shear zone indicating top-to-the-N motion. By combining X-ray mapping with multi-equilibrium calculations, we estimate the phengite crystallization conditions at 270 +/- 50 degrees C and 8.1 +/- 2kbar at an age of 45.9 +/- 1.1Ma. Combining this P-T-t estimate with data from the literature allows us to constrain the timing and geometry of Alpine continental subduction. We propose that the Brianconnais units were scalped on top of the slab during ongoing continental subduction and exhumed continuously until collision.
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