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The dark-colored rocks are gabbro. The light-colored mass is a single large anorthosite xenolith within the gabbro. Xenoliths are "foreign rocks" that sometimes occur in igneous rocks - they form by detachment of magma chamber wall rocks. In this case, the magma chamber contained gabbroic magma
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Gabbro is a mafic, phaneritic (coarsely-crystalline), intrusive igneous rock dominated by the minerals plagioclase feldspar and pyroxene. Anorthosite is a mafic, phaneritic, intrusive igneous rock dominated by just plagioclase feldspar.
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These rocks are part of the widespread Duluth
Complex, a ~1.1 billion year old suite of igneous rocks in northeastern Minnesota that is associated with volcanism in the Lake Superior segment of the ancient Mid-Continent Rift System.
264:– You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
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Large anorthosite xenolith in ophitic ilmenite gabbro (anorthosite series, Duluth
Complex, Mesoproterozoic, 1099 Ma; Keene Creek East Skyline Parkway roadcut, Duluth, Minnesota, USA) 1 (22039818790).jpg
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Large anorthosite xenolith in ophitic ilmenite gabbro (anorthosite series, Duluth
Complex, Mesoproterozoic, 1099 Ma; Keene Creek East Skyline Parkway roadcut, Duluth, Minnesota, USA) 1
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Locality: Keene Creek East outcrop - roadcut along the northern side of
Skyline Parkway, Duluth, northeastern Minnesota, USA (46° 45’ 08.52” North, 92° 10’ 29.93” West)
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This file contains additional information, probably added from the digital camera or scanner used to create or digitize it.
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Geologic unit & age of gabbros: anorthosite series, Duluth
Complex, late Mesoproterozoic, 1099 Ma
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Large anorthosite xenolith in ophitic ilmenite gabbro in the
Precambrian of Minnesota, USA.
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Age of anorthosite xenolith: unknown, but
Precambrian, likely derived from the lower crust
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Add a one-line explanation of what this file represents
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https://www.flickr.com/photos/jsjgeology/22039818790/
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Commons is a freely licensed media file repository.
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