Cathedral Peak Granodiorite
The Cathedral Peak Granodiorite (CPG) was named after its type locality, Cathedral Peak in Yosemite National Park, California. The granodiorite forms part of the Tuolumne Intrusive Suite (Tuolumne Batholith), one of the four major intrusive suites within the Sierra Nevada. It has been assigned radiometric ages between 88 and 87 million years and therefore reached its cooling stage in the Coniacian (Upper Cretaceous).
The Cathedral Peak Granodiorite forms part of the central eastern Sierra Nevada in California. It is exposed in glaciated outcrops from the upper Yosemite Valley into the high Sierra Divide. It covers large parts of Mariposa County and Tuolumne County and also touches Madera County and Mono County. At its northern end it includes Tower Peak and Matterhorn Peak, at 12,264 feet (3743 m) its highest elevation. In its southwestern section rises the Cathedral Range with the 10,911 feet Cathedral Peak (3326 m) above Tuolumne Meadows. California State Route 120 traverses the granodiorite in its southern half. Due to the block-faulting and tilting of the Sierra Nevada to the west its drainage system is oriented to the west and follows mainly southwesterly courses, especially in the northern section.
The shape of the intrusion is a drawn-out rectangle or ellipse oriented roughly in the NNW-SSE-direction. Its long dimension measures about 30 miles (48 km), its width hardly reaches 12 miles (19 km) at the northern end. The surface area amounts to about 230 square miles (600 km2), roughly half of the total area of the Tuolumne Intrusive Suite. The granodiorite completely engulfes the Johnson Granite Porphyry in the south. It is surrounded in the southeast, southwest and northwest by the Half Dome Granodiorite. In its central belt region it touches the Kuna Crest Granodiorite. In the north and northeast it comes into contact with weakly metamorphosed country rocks, mainly Paleozoic and Jurassic metavolcanics and metasediments.
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