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Published byLuke Eaton Modified over 9 years ago
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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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(1977)
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P-T paths from zoned garnet
Tauern Window, Austria (Selverstone et al, 1984)
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Tauern Window, Austria (Selverstone et al, 1984)
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P-T paths and nappe tectonics - New Hampshire
Spear et al. (2007) Ernst, 1976
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Trace element thermobarometry
Ti-in-quartz (Titaniq) Y in garnet
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Y zoning in garnet BF-17A - Western New Hampshire
TM Strafford Dome, Central Vermont 4341 ppm - inner core 5346 ppm - outer core 29 ppm - rim
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garnet + xenotime assemblages
Y concentration in garnet + xenotime assemblages Tectonic loading at rates in excess of 8 cm/year
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Rates of tectonic processes
Diffusion studies: Rates of tectonic processes Ti-in-quartz (Titaniq) Mn in garnet
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79-149d (New Hampshire: kyanite zone)
Grt St Ky Grt
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79-149d (New Hampshire: kyanite zone)
CL image Grt
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79-149d (New Hampshire: kyanite zone)
CL image Grt
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79-149D Orfordville, NH: kyanite zone
CL image Qtz Grt
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Peak T/Duration 550C/1.2 m.y. 575C/0.6 m.y. 600C/0.3 m.y.
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TM-730 - Central VT. Staurolite-Kyanite zone
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TM-730 Mn zoning
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TM-730 - Mn diffusion modeling
2.5 m.y. 0.25 m.y.
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10 cm/year
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10 cm/year
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