1 / 27

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

30 years of P-T-t paths: What we’ve learned about orogenesis. Frank S. Spear Rensselaer Polytechnic Institute. (1977). Tauern Window, Austria (Selverstone et al, 1984). P-T paths from zoned garnet. Tauern Window, Austria (Selverstone et al, 1984).

lorene
Download Presentation

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

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

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)

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

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

  7. 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

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

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

  10. 79-149d (New Hampshire: kyanite zone) Grt St Ky Grt

  11. 79-149d (New Hampshire: kyanite zone) CL image Grt

  12. 79-149d (New Hampshire: kyanite zone) CL image Grt

  13. 79-149D Orfordville, NH: kyanite zone CL image Qtz Grt

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

  15. TM-730 - Central VT. Staurolite-Kyanite zone

  16. TM-730 Mn zoning

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

  18. 10 cm/year

  19. 10 cm/year

More Related