File:Quartz basalt (Fantastic Lava Beds, upper Holocene; Cinder Cone, Lassen County, California, USA) (39806259280).jpg
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Quartz basalt from the Holocene of California, USA. (public display, Geology Department, Wittenberg University, Springfield, Ohio, USA) This is basalt from a lava flow that erupted from "Cinder Cone", a cinder cone volcano in California's Lassen Volcano National Park. Cinder cones are relatively small, steep-sided cones of loose igneous debris, consisting principally of scoria and vesicular basalt. Both rocks are mafic, extrusive igneous rocks composed of plagioclase feldspar and pyroxene. Scoria has a frothy texture and vesicular basalt has a vesicular texture. Both terms refer to the presence holes that were former gas bubbles in lava. Frothy-textured rocks have numerous small holes. Vesicular-textured rocks have fewer, larger holes. Lava flows that emanate from cinder cone volcanoes are often vesicular basalt and non-vesicular basalt, as is the sample shown above. The light-colored chunks in the basalt are xenocrysts ("foreign crystals") acquired as rising magma plucked material from the walls of the conduit or magma chamber. Xenocrysts in basalt lava at Cinder Cone include quartz, olivine, and plagioclase feldspar. Quartz in basalt is very unusual. Dendrochronologic dating has shown that the principal lava flow at Cinder Cone erupted in the year 1666 A.D. Isotopic dating has given dates from about 1630 to 1670 A.D. Stratigraphy: Fantastic Lava Beds, upper Holocene, 1666 A.D. Locality: unrecorded/undisclosed site at or near Cinder Cone, ~17 to 17.5 air-kilometers east-northeast of Lassen Volcano, far-western Lassen County, northern California, USA (40° 32' 51" North latitude, 121° 19' 12" West longitude) For more info., see: <a href="https://en.wikipedia.org/wiki/Cinder_Cone_and_the_Fantastic_Lava_Beds" rel="nofollow">en.wikipedia.org/wiki/Cinder_Cone_and_the_Fantastic_Lava_...</a> |
| Date | |
| Source | Quartz basalt (Fantastic Lava Beds, upper Holocene; Cinder Cone, Lassen County, California, USA) |
| Author | James St. John |
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/39806259280 (archive). It was reviewed on 10 October 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 00:22, 10 October 2019 | | 2,040 × 1,193 (2.15 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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