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Structure, Construction, And Emplacement Of Jurassic And Cretaceous Plutons In The Keiths Dome-Echo Lake Area, Southwest Of Lake Tahoe, California, Pamela Jamie Clay
Structure, Construction, And Emplacement Of Jurassic And Cretaceous Plutons In The Keiths Dome-Echo Lake Area, Southwest Of Lake Tahoe, California, Pamela Jamie Clay
Master's Theses
Jurassic (Keiths Dome) and Cretaceous (Echo Lake, Glen Alpine) plutons and their host rocks were investigated, and structural and petrographic analyses were conducted, to elucidate the nature and timing of pluton construction and emplacement, deformation, and related tectonic regimes. Evenly distributed enclaves and a lack of internal contacts suggest pluton construction via thorough mixing of multiple increments of magma. Ductile flow of conglomerate host rocks, stoping of volcanic host rocks, and possibly other processes, facilitated emplacement. In Cretaceous plutons, margin-parallel magmatic foliations may record internal processes, whereas the Keiths Dome pluton contains foliations that are discordant to contacts and likely …
Structure And Emplacement Of Cretaceous Plutons In Northwest Yosemite National Park, California, Ashley Van Dyne
Structure And Emplacement Of Cretaceous Plutons In Northwest Yosemite National Park, California, Ashley Van Dyne
Master's Theses
The ~103-98 Ma Yosemite Valley Intrusive Suite, younger Granodiorite North of Tuolumne Peak, and ~97 Ma Yosemite Creek Granodiorite intrude plutonic and metasedimentary host rocks of the central Sierra Nevada batholith. Precambrian to Cambrian metasedimentary rocks separate the Yosemite Valley Intrusive Suite from the younger (94-85 Ma) Tuolumne Intrusive Suite and are interpreted to represent the original extent of the older suite. The Mt. Hoffman granodiorite and Taft Granite of the Yosemite Valley Intrusive Suite record evidence of the development of magma chambers, whereas the Tuolumne Peak and Yosemite Creek granodiorites were likely constructed via several small increments, and a …