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The Early Cretaceous Ramona plutonic complex is an elliptical-in-plan structure that intruded the mid- to upper crust of the western zone of the Peninsular Ranges batholith. The complex is composed of a dozen concentrically arranged silicic to intermediate plutons with minor gabbro. Lithologically, these plutons represent six regional plutonic suites, each of which consists of multiple plutons in this part of the batholith. Seven new U-Pb zircon ages indicate that plutons are younger toward the center of the complex, from an age possibly as old as ca. 115 Ma to ca. 101 Ma. The composition of the Ramona plutonic complex...

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