Composite dike of andesite and rhyolite at Klondyke, Arizona

Geological Society of America Bulletin



composite dike of probable Tertiary age intrudes Precambrian granodiorite 6 miles north of KlondykeArizona. The dike is exposed discontinuously for about 1500 feet along the strike and has a core of porphyritic rhyolite 15-20 feet thick flanked by coarsely porphyritic andesite 1-2 feet thick. Field evidence indicates that the rhyolite is later than the andesite but that the core of the original andesite dike was still hot and unconsolidated at the time of intrusion of the rhyolite. Chemically, the rhyolite is nearly identical to a large alkali granite pluton of Tertiary age exposed 1 mile east. The andesite component is similar both petrographically and chemically to lavas exposed in the region, but a direct relationship could not be established. Meager evidence suggests that the two dike components were derived from separate magma bodies rather than being differentiates of a single magma.

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Publication type Article
Publication Subtype Journal Article
Title Composite dike of andesite and rhyolite at Klondyke, Arizona
Series title Geological Society of America Bulletin
DOI 10.1130/0016-7606(1963)74[1049:CDOAAR]2.0.CO;2
Volume 74
Issue 8
Year Published 1963
Language English
Publisher Geological Society of America
Description 8 p.
First page 1049
Last page 1056
Country United States
State Arizona
Other Geospatial Klondyke area
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