Signatur:
S 90.0002(1755)
In:
Professional paper
Beschreibung / Inhaltsverzeichnis:
We have used terrestrial cosmogenic nuclides (TCN) to establish the age of some of the most extensive Quaternary alluvial fans in Death Valley, California. These intermediate-age alluvial fans are most extensive on the western side of the valley, where tectonic deformation is considerably less pronounced than on the eastern side of the valley. These fans are characterized by a relatively smooth, densely packed desert pavement formed by well-varnished (blackened) clasts. These surfaces have been mapped as the Q2 gravel by previous workers and as unit Qai (intermediate age) by us. However, the intermediate-age gravels probably contain multiple subunits, as evidenced by slight differences in morphologic expression, soil formation, and inset geomorphic relations. The TCN technique used herein sums the cosmogenic 36Cl in approximately 2.5-meter-deep profiles through soil and host alluvium, thus avoiding some of the problems associated with the more typical surface-exposure dating of boulders or smaller clasts.
Materialart:
Schriftenreihen ausleihbar
Seiten:
V, 44 S. : graph. Darst., Ill. ; 28 cm + 1 CD-ROM
ISBN:
9781411321878
Serie:
U.S. Geological Survey professional paper 1755
URL:
http://pubs.usgs.gov/pp/1755/
Klassifikation:
Regionale Geologie
Standort:
Kompaktmagazin unten
Zweigbibliothek:
GFZ Bibliothek
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