Yosemite intrusive suite
Yosemite intrusive suite
middle Cretaceous, ~97-104 Ma
Occurs in Yosemite Valley and adjacent areas in the central Sierra Nevada. Chiefly granite and leucogranite. Zircon U-Pb ages from this unit are ~97-108 Ma (Stern and others, 1981; Wooden and others, 1999: Ratajeski and others, 2001; Lackey and others, 2008), although the ~108 Ma age is probably an unmapped inlier of the adjacent Bass Lake pluton (part of unit Gfg; Lackey and others, 2008). In addition, Evernden and Kistler (1970) report a biotite K-Ar age of 90 Ma, and Naeser and Dodge (1969) report an apatite fission track age of 65 Ma and sphene fission track age of 99 Ma. Major plutons: El Capitan Granite, granite of Rancheria Mountain, Taft Granite, and leucogranite of Ten Lakes. Intruded by Buena Vista Crest intrusive suite. Coeval with Shaver Intrusive Suite (unit Gsl) to south.