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Igneous Rocks

Two photographs of igneous rock compositional endmembers, granite and basalt, in Grand Canyon National Park. The top photo shows a large lighter colored rock of the Quartermaster granite. The bottom photo shows a large darker colored rock of the Cardenas Basalt.

Photographs of igneous rock compositional endmembers, granite and basalt, in Grand Canyon National Park. (A) The minerals quartz and alkali feldspar are responsible for the light-colored, 1.375 billion-year-old Quartermaster granite (included in map unit Yg [Young granite and pegmatite]) in western Grand Canyon. Rhyolite is the volcanic equivalent of granite. (B) Iron and manganese provide the dark color to the denser, 1.100 billion-year-old Cardenas Basalt (Yc). Gabbro is the plutonic equivalent of basalt.

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NPS photographs by Erin Whitakker from the Trail of Time.

Public domain:Full Granting Rights

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Grand Canyon National Park, Code: GRCA

Grand Canyon National Park, Arizona
Latitude: 36.3291397094727, Longitude: -112.790603637695

NPS.gov Collection

01/01/0001

Public Can View

Friday, June 4, 2021 2:26:04 PM

Friday, June 4, 2021 2:26:04 PM

GRCA_31.jpg

Monday, January 1, 0001 12:00:00 AM

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6.2 MB

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