accretion of granite-rhyolite province ( 1.55-1.35 ga ) resulting in the nd line
DESCRIPTION
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. - PowerPoint PPT PresentationTRANSCRIPT
• Accretion of Granite-Rhyolite Province (1.55-1.35 Ga ) resulting in the Nd line
• Terranes stitched together by the emplacement of anorogentic granites (1.48-1.35 Ga) – generation of TIKL?
Whitmeyer and Karlstrom, 2007
Whitmeyer and Karlstrom, 2007
• Long wavelength magnetization • Change in magnetization aligns with Nd-
lineWarm colors high susceptibility Cool colors low susceptibility
• 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
Previous Geophysical Observations
(Ravat, 2007 )
(Ravat et al., 2009)
Full-spectrum magnetic anomaly map
Depth integrated magnetic contrasts
Warm colors high susceptibility Cool colors low susceptibility
Crustal modification
OIINK Crustal Thickness