Grenville Iapetus Peri-Gondwanan Taconic/Acadian Atlantic Alleghanian <= USGS Circ. 1264 (2004) mod from Hatcher (2002) Appalachians orogen: - Fossil regimes.

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Presentation transcript:

Grenville Iapetus Peri-Gondwanan Taconic/Acadian Atlantic Alleghanian <= USGS Circ (2004) mod from Hatcher (2002) Appalachians orogen: - Fossil regimes complementary - Exposed accreted terranes - Cryptic terrane suturing - Laurentian-Paleozoic transition - Upper mantle modification - GeoPrisms focus site First-order Plan of Appalachian Orogen (Hibbard and Waldron, 2009)

S. Appalachians Suturing and Upper Mantle Modification (Wannamaker, 2005, Surv. Geop.) MT can: Clarify continental assembly through suture zone mapping Assess mantle modification by purging of volatiles, ICE’s Augment active tectonic models through their fossil aftermath

Deep Crustal Conductivity In Fossil Regimes; Graphite, Sulphide Fluid Remobilization, Shearing Luque et al. (AJS, 1998) Fluid remobilized graphite Jones et al. (JGG,1997) Sulphide Stringers Geomagnetic Induction Arrows, 3867 s Geomagnetic Induction Sites (Mareschal et al., 1983)

Northern Appalachians regional conductor, stronger than in South (Greenhouse and Bailey, 1981) Depression of Appalachian coast response indicates compensating interior conductor Broadscale 2D forward models suggest main conductivity lies in lower crust, but hard to resolve from GMV alone Geomagnetic induction arrows corrected for coast effect Seismicity ‘avoids’ conductor

Fischer et al. (2010) - Mantle receiver functions often imply sharp LAB along eastern seaboard - Can conductivity confirm based on hydration or melting?