Dead orogens: Are they really? Crustal vP/vS ratio is

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Presentation transcript:

Dead orogens: Are they really? Crustal vP/vS ratio is After Christensen, JGR 1996 Crustal vP/vS ratio is sensitive to lithology: Quartz most abundant in the Cordillera and older orogenic belts. After Lowry & Pérez-Gussinyé, Nature 2011

Moho temperature from Te from Pn velocity Moho temperature from Te Wet Qtz/Wet Olv Dry Ano/Dry Olv Schutt et al., e.g., this meeting…  water & crustal lithology contribute to Te variations Low-Te Cordillera: High-Te Stable Interior: Wet Quartz Dry Feldspar Wet Olivine Dry Olivine

For Te < 30 km in the Cordillera, crustal lithology is sometimes evident… For larger Te in the stable interior, mantle water tends to dominate the picture. Based on mapped Te variation, the Appalachian orogen in central Atlantic states seem interesting… vP/vS Te