30 years of P-T-t paths: What we’ve learned about orogenesis

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Presentation transcript:

30 years of P-T-t paths: What we’ve learned about orogenesis Frank S. Spear Rensselaer Polytechnic Institute

(1977)

P-T paths from zoned garnet Tauern Window, Austria (Selverstone et al, 1984)

Tauern Window, Austria (Selverstone et al, 1984)

P-T paths and nappe tectonics - New Hampshire Spear et al. (2007) Ernst, 1976

Trace element thermobarometry Ti-in-quartz (Titaniq) Y in garnet

Y zoning in garnet BF-17A - Western New Hampshire TM-730 - Strafford Dome, Central Vermont 4341 ppm - inner core 5346 ppm - outer core 29 ppm - rim

garnet + xenotime assemblages Y concentration in garnet + xenotime assemblages Tectonic loading at rates in excess of 8 cm/year

Rates of tectonic processes Diffusion studies: Rates of tectonic processes Ti-in-quartz (Titaniq) Mn in garnet

79-149d (New Hampshire: kyanite zone) Grt St Ky Grt

79-149d (New Hampshire: kyanite zone) CL image Grt

79-149d (New Hampshire: kyanite zone) CL image Grt

79-149D Orfordville, NH: kyanite zone CL image Qtz Grt

Peak T/Duration 550C/1.2 m.y. 575C/0.6 m.y. 600C/0.3 m.y.

TM-730 - Central VT. Staurolite-Kyanite zone

TM-730 Mn zoning

TM-730 - Mn diffusion modeling 2.5 m.y. 0.25 m.y.

10 cm/year

10 cm/year