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Enclaves of Diorite in Granite
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Photographer: Ron Wolf
ID: 0000 0000 0710 1505 (2010-07-14)Copyright © 2010 Ron Wolf
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INFORMATION PROVIDED WITH THE PHOTO
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date of photo Jun 19, 2010
location
Along the Merced River. Yosemite National Park (Mariposa County, California, US)notes The dark patches of Diorite within this intrusion of El Capitan Granite are enclaves, fragments of foreign rock engulfed in a mass of magma. The fragments were probably torn loose from the walls of a conduit by the rising granitic magma. Both the El Capitan Granite and the diorite enclaves date from Cretaceous time, about 103 million years ago. The unusually fresh, unweathered surface shown here was exposed as the result of a large rockslide in 1982.keywords: batholith, Cretaceous, diorite, El Capitan Granite, enclave, granite, rock, Sierra, intrusion, petrology
camera Canon 40D, 60mm, f/10, 1/80 sec.
photo category: Misc. - geology
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Using this photo The thumbnail photo (128x192 pixels) on this page may be freely used for personal or academic purposes without prior permission under the Fair Use provisions of US copyright law as long as the photo is clearly credited with © 2010 Ron Wolf.
For other uses, or if you have questions, contact Ron Wolf RonWolf[AT]EyeOnNature.com. (Replace the [AT] with the @ symbol before sending an email.) |
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