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

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Presentation on theme: "30 years of P-T-t paths: What we’ve learned about orogenesis Frank S. Spear Rensselaer Polytechnic Institute."— Presentation transcript:

1 30 years of P-T-t paths: What we’ve learned about orogenesis Frank S. Spear Rensselaer Polytechnic Institute

2 (1977)

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

4 Tauern Window, Austria (Selverstone et al, 1984)

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

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

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

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

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

12 79-149d (New Hampshire: kyanite zone) Grt Ky St Grt

13 79-149d (New Hampshire: kyanite zone) Grt CL image

14 79-149d (New Hampshire: kyanite zone) CL image Grt

15 79-149D Orfordville, NH: kyanite zone CL image Grt Qtz

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

17 TM Central VT. Staurolite-Kyanite zone

18 TM-730 Mn zoning

19 TM Mn diffusion modeling 0.25 m.y. 2.5 m.y.

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23 10 cm/year

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