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Full-Text Articles in Geological Engineering
Outboard Onset Of Ross Orogen Magmatism And Subsequent Igneous And Metamorphic Cooling Linked To Slab Rollback During Late-Stage Gondwana Assembly, Timothy Paulsen, John Encarnación, Anne Grunow, Jeffrey Benowitz, Paul Layer, Chad Deering, Jakub Sliwinski
Outboard Onset Of Ross Orogen Magmatism And Subsequent Igneous And Metamorphic Cooling Linked To Slab Rollback During Late-Stage Gondwana Assembly, Timothy Paulsen, John Encarnación, Anne Grunow, Jeffrey Benowitz, Paul Layer, Chad Deering, Jakub Sliwinski
Michigan Tech Publications
Changes in magmatism and sedimentation along the late Neoproterozoic-early Paleozoic Ross orogenic belt in Antarctica have been linked to the cessation of convergence along the Mozambique belt during the assembly of East-West Gondwana. However, these interpretations are non-unique and are based, in part, on limited thermochronological data sets spread out along large sectors of the East Antarctic margin. We report new 40Ar/39Ar hornblende, muscovite, and biotite age data for plutonic (n = 13) and metasedimentary (n = 3) samples from the Shackleton–Liv Glacier sector of the Queen Maud Mountains in Antarctica. Cumulative 40Ar/39Ar age data show polymodal age peaks (510 …