Physical Sciences and Mathematics Commons^™

Geochemical, Isotopic, And U-Pb Geochronologic Investigations Of Intrusive Basement Rocks From The Wallowa And Olds Ferry Arc Terranes, Blue Mountains Province, Oregon-Idaho, Gene Alan Kurz

Boise State University Theses and Dissertations

Late Paleozoic to Mesozoic arc terranes comprising the Blue Mountains Province of northeastern Oregon and western Idaho are poorly understood in terms of the timing and duration of recorded magmatism and deformation. Intrusive basement rocks of the Wallowa and Olds Ferry arc terranes are investigated using a combination of highprecision U-Pb geochronology, radiogenic isotope and trace element geochemistry, and structural geology to help constrain their tectonomagmatic evolution and to provide a better understanding for the accretionary history of the Blue Mountains Province.

The Cougar Creek Complex is a compositionally diverse intrusive complex interpreted as the mid-crustal portion of the Wallowa …

Structural And Stratigraphic Age Constraints Of The Inskip Formation, East Range, Nevada: Implications For Mesozoic Tectonics Of Western North America, Joshua David Wilkins

Boise State University Theses and Dissertations

Structural, stratigraphic, and U-Pb geochronologic studies of the Inskip Formation of the north-central East Range place new constraints on the depositional age of the Inskip Formation and the timing of contractional deformation in the East Range, including Golconda thrusting. The Inskip Formation was initially considered Permian in age and to rest unconformably on the Valmy (or Leach) Formation (Ferguson et al., 1951). Later mapping by Whitbread (1978, 1994) divided the formation into the Upper and Lower Inskip Formation, both of which were inferred to be Mississippian in age. Laterreinterpretation of Whitebread’s (1994) work and new paleontological data revised the age …

Age And Isotopic Investigations Of The Olds Ferry Terrane And Its Relations To Other Terranes Of The Blue Mountains Province, Eastern Oregon And West-Central Idaho, Kyle P. Tumpane

Boise State University Theses and Dissertations

The Olds Ferry terrane of the Blue Mountains province is one of the numerous accreted terranes that comprise the western North American Cordillera. The Blue Mountains province is located in central and eastern Oregon, western Idaho, and extreme southeastern Washington, and is a crucial link in reconstructions of the North American Cordillera due to its position in an area with few visible terranes between the more extensively exposed terranes to the south in California and Nevada and to the north in Canada and Alaska.

New field evidence and U-Pb zircon geochronology for volcanics within the sedimentary onlap assemblages overlying the …