Zircon U-Pb Ages and Petrologic Evolution of the English Peak Granitic Pluton: Jurassic Crustal Growth in Northwestern California GEOSPHERE; V
Research Paper THEMED ISSUE: Active Margins in Transition—Magmatism and Tectonics through Time: An Issue in Honor of Arthur W. Snoke GEOSPHERE Zircon U-Pb ages and petrologic evolution of the English Peak granitic pluton: Jurassic crustal growth in northwestern California GEOSPHERE; v. 12, no. 5 W.G. Ernst1, Eric S. Gottlieb1, Calvin G. Barnes2, and Jeremy K. Hourigan3 1Geological Sciences, Stanford University, Building 320, Stanford, California 94305-2115, USA doi:10.1130/GES01340.1 2Geosciences, Texas Tech University, MS 1053, Science Building 125, Lubbock, Texas 79409-1053, USA 3Earth and Planetary Sciences, University of California–Santa Cruz, 1156 High Street, Santa Cruz, California 95064, USA 6 figures; 1 table; 1 supplemental file CORRESPONDENCE: wernst@ stanford .edu ABSTRACT incorporated into the evolving Jurassic continental crust. It took place prior to the earliest Cretaceous onset of westward transport of the stack of Klamath CITATION: Ernst, W.G., Gottlieb, E.S., Barnes, In the central Klamath Mountains, the English Peak plutonic complex (EPC) allochthons relative to the active Jura-Cretaceous Sierran calc-alkaline arc. C.G., and Hourigan, J.K., 2016, Zircon U-Pb ages and petrologic evolution of the English Peak granitic invaded the faulted contact between the outboard Eastern Hayfork and inboard pluton: Jurassic crustal growth in northwestern North Fork terranes of the Western Paleozoic and Triassic Belt (WTrPz). This California: Geosphere, v. 12, no. 5, p. 1422–1436, calc-alkaline igneous complex is composed of two small, ~1–2-km-diame- INTRODUCTION TO THE REGIONAL GEOLOGY doi: 10 .1130 /GES01340.1. ter, relatively mafic satellitic plutons peripheral to the younger, much larger, ~10–15-km-diameter English Peak zoned granitic pluton.
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