Abstract As North America collided with Africa to form Pangea during the Alleghanian orogeny, crystalline and sedimentary rocks in southeastern United States were thrust forelandward along Appalachian décollement. We examined Ps receiver functions better constrain kinematics of this prominent subsurface structure. From Southeastern Suture Margin Experiment (SESAME) other EarthScope stations on ...

The Ross orogen of Antarctica is one of Earth’s great Phanerozoic mountain belts. It is thought from igneous geochemistry, deformation patterns, and sedimentation history to be the result of late Neoproterozoic and early Paleozoic plate-margin convergence between paleo-Pacifi c oceanic lithosphere and continental lithosphere represented by the composite East Antarctic shield. Convergence along ...

Abstract. The Stratigraphy, Structure, Tectonics (SST) course at James Madison University incorporates a capstone project that traverses the Mid Atlantic region of Appalachian Orogen and includes several all-day field trips. In Fall 2020 semester, SST trips transitioned to virtual format, due restrictions from COVID pandemic. trip projects were developed in web-based Google Earth incorporated o...

The theories of critical orogenic wedges and fluvial erosion are combined to explore the interactions between tectonics, erosion, and climate. A model framework is developed which allows the derivation of an exact analytical scaling relationship for how orogen width, height, and rock uplift rate vary as a function of accretionary flux and precipitation rate. Compared to a model with prescribed ...

The Iapetus Ocean was the first ancient ocean to be identified following development of plate tectonics; its history has been fundamental in relating orogenesis and motion. probably formed 3-way rifting between Laurentia, Baltica, Amazonia – West Africa (a block that became incorporated Gondwana). Closure trapped numerous terranes during Appalachian–Caledonide Orogen. Subsequent deformation, in...

The oldest rocks in the Avalonian Antigonish Highlands of northern mainland Nova Scotia, Canada, are late Neoproterozoic (>618 Ma) volcanic and sedimentary Georgeville Group intruded by gabbroic/dioritic to granitic plutons. New U–Pb zircon ages presented here for five samples from plutons into James River (or) Keppoch formations have ranging ca. 615 604 Ma. They petrological characteristics...

The Ellsworth belt is one of several fault-bounded blocks exposed along the southeastern coast Maine that formed within Ganderia. New ID-TIMS U–Pb geochronological data integrated with field relationships provide additional insights into timing magmatism and deformation in belt. deformed Lamoine Granite was selected for zircon analysis to: (i) establish protolith age; (ii) direct temporal const...