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Geology Of The Clairmont Springs 7.5-Minute Quadrangle And Geochronology Of The Alabama Blue Ridge, Adelie Ionescu
Geology Of The Clairmont Springs 7.5-Minute Quadrangle And Geochronology Of The Alabama Blue Ridge, Adelie Ionescu
MSU Graduate Theses
The Alabama Blue Ridge (USA) of the southern Appalachians contains metamorphic rocks and structures associated with island arc accretion and continent-continent collision that record the Acadian and Alleghenian orogenies. The western Blue Ridge is underlain by Cambrian to Mississippian, clastic and carbonate, low-grade, greenschist facies metamorphic Talladega belt that formed outboard from the Alabama promontory or along the Laurentian margin. The eastern Blue Ridge contains the Neoproterozoic to Paleozoic, lithologically diverse, high grade, middle to upper amphibolite facies Ashland Supergroup. Geologic mapping of the Clairmont Springs 7.5- minute quadrangle unveils tectonic relationships between the eastern and western Blue Ridge and …
Geologic Mapping And Geochronology Of The Heavens Gate 7.5-Minute Quadrangle: How Long Does It Take To Accrete An Island Arc To A Continent?, Samuel Gordon Deyoung
Geologic Mapping And Geochronology Of The Heavens Gate 7.5-Minute Quadrangle: How Long Does It Take To Accrete An Island Arc To A Continent?, Samuel Gordon Deyoung
MSU Graduate Theses
The Blue Mountain province of western Idaho and eastern Oregon is composed of a mélange of geologic terranes that represent Permian and Triassic island arcs that collided with North America in the Mesozoic, resulting in westward growth of the continent. Separating these accreted rocks from North America are the mid- crustal metamorphic rocks of the Salmon River suture zone. Containing units and features associated with the accreted island arc terranes and suture zone is the Heavens Gate 7.5-minute quadrangle, located in Idaho county, Idaho. Within the quadrangle the Salmon River suture zone is divided into structural blocks by a series …