7 research outputs found
The Role of Radioactivities in Astrophysics
I present both a history of radioactivity in astrophysics and an introduction
to the major applications of radioactive abundances to astronomy
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A Guide to the Geology of Organ Pipe Cactus National Monument and the Pinacate Biosphere Reserve
Organ Pipe Cactus National Monument in SW Arizona and the Pinacate Biosphere Reserve in NW Sonora protect two magnificent yet geologically distinct parts of the Sonoran Desert. Rocks of the Organ Pipe-Pinacate region have been faulted and eroded into mountains and basins typical of the Basin and Range Province of SW North America. The Biosphere Reserve contains young volcanoes, basalt lava flows, and giant maar craters on the Pinacate Volcanic field. This booklet is your field guide to the geology of these splendid desert landscapes.Released online at the AZGS Document Repository on 18 July 2016.Documents in the AZGS Document Repository collection are made available by the Arizona Geological Survey (AZGS) and the University Libraries at the University of Arizona. For more information about items in this collection, please contact [email protected]
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Compilation Bedrock Geologic Map of Cemetery Ridge, La Paz and Yuma Counties, southwest Arizona v.2
UPDATED in February 2022. Cemetery Ridge is a northwest-trending group of low-relief hills in a remote area in southwest Arizona. Geological mapping by Grubensky and Demsey (1991) and Gilbert and Spencer (1992) identified the basic rock types and structure of the Ridge. Haxel et al. (2015, 2018, 2021) and Jacobson et al. (2017) subsequently found that quartzofeldspathic schist at Cemetery Ridge is part of the Orocopia Schist, a Late Cretaceous low-angle subduction complex that underlies much of southern California and southwest Arizona. They also found that the Orocopia Schist at Cemetery Ridge contains tectonic blocks of oceanic peridotite, chiefly harzburgite and serpentinite, unique in southwest Arizona and probably transported from western California.Version 2 was uploaded on 14 Feb. 2022. S.M. Richard and B.J. Johnson were added to the author list. This update stems from fieldwork in Jan. 2022 by the four authors.Documents in the AZGS Documents Repository collection are made available by the Arizona Geological Survey (AZGS) and the University Libraries at the University of Arizona. For more information about items in this collection, please contact [email protected]