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Accretion of Granite-Rhyolite Province ( 1.55-1.35 Ga ) resulting in the Nd line PowerPoint Presentation
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Accretion of Granite-Rhyolite Province ( 1.55-1.35 Ga ) resulting in the Nd line. Whitmeyer and Karlstrom , 2007. Terranes stitched together by the emplacement of anorogentic granites (1.48-1.35 Ga ) – generation of TIKL?. Whitmeyer and Karlstrom , 2007.

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slide1

Accretion of Granite-Rhyolite Province (1.55-1.35 Ga) resulting in the Nd line

Whitmeyer and Karlstrom, 2007

  • Terranes stitched together by the emplacement of anorogentic granites (1.48-1.35 Ga) – generation of TIKL?

Whitmeyer and Karlstrom, 2007

slide2

Previous Geophysical Observations

Depth integrated magnetic contrasts

  • Long wavelength magnetization
  • Change in magnetization aligns with Nd-line
  • Warm colors  high susceptibility
  • Cool colors  low susceptibility

(Ravat, 2007 )

Full-spectrum magnetic anomaly map

  • Short wavelength magnetic anomalies
  • Do magnetic highs mark locations of intrusive events that modified the crust?
  • Abrupt transition from high to low anomaly marks the TIKL

Warm colors  high susceptibility

Cool colors  low susceptibility

(Ravat et al., 2009)