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- W254899861 abstract "In models of tectonic convergence, oceanic material enters subduction zones, descends, and is deformed. Over time subduction cuts across areas of deformation and should become younger in a direction opposite the dip of the subduction zone. Typically, geologists have found it difficult to document this because of insufficient cross-strike exposure, uncertainties in interpretation of radiometric ages, and overprinting of later tectonothermal events. The Robertson Bay and Bowers terranes of northern Victoria Land, which were accreted to the east antarctic craton (Gondwana margin) during the Ordovician Ross Orogeny, offer a unique opportunity to document a potentially diachronous deformation associated with an Ordovician orogeny. Exposed over a large area, these terranes display nearly uniform lithology, low metamorphic grade, and structural style and are combined with the absence of a regionally significant tectonothermal over print. Reconnaissance age analysis by potassium/argon and argon-40/argon-39 methods suggests that ages decrease eastward across the Robertson Bay terrane. The objective is systematically to collect samples of and perform argon-40/argon-39 age analysis on a whole-rock suite from the Bowers and Robertson Bay terranes. The resultant ages would more clearly document the suggested diachronism and allow more rigorous evaluation of the various tectonothermal models proposed for the evolution of themore » Gondwana margin.« less" @default.
- W254899861 created "2016-06-24" @default.
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- W254899861 date "1987-09-01" @default.
- W254899861 modified "2023-09-26" @default.
- W254899861 title "Argon-40/argon-39 whole-rock slate ages from the Robertson Bay terrane, northern Victoria Land: Documenting diachronous orogeny as a result of terrane accretion" @default.
- W254899861 hasPublicationYear "1987" @default.
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