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Summary of potassium

Author: Evans, S.H. Jr.; Brown, F.H.; University of Utah. Department of Geology and Geophysics.; United States. Department of Energy. Geothermal Division.; United States. Department of Energy. Office of Scientific and Technical Information.
Publisher: Washington, D.C : United States. Dept. of Energy. Geothermal Division ; Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 1980.
Edition/Format:   eBook : Document : National government publication : English
Database:WorldCat
Summary:
A significant improvement in efficiency of the K-Ar laboratory was brought about by completion of a second extraction line. Two extractions can now be done routinely each day and the ³⁸Ar spike ratios of the new table will permit dating of much younger samples than previously. Extensive K-Ar dating of samples from the Mineral Mountains shows intervals of silicic volcanism at 0.5, 0.8 and 7.5 m.y. K-Ar dating of  Read more...
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Material Type: Document, Government publication, National government publication, Internet resource
Document Type: Internet Resource, Computer File
All Authors / Contributors: Evans, S.H. Jr.; Brown, F.H.; University of Utah. Department of Geology and Geophysics.; United States. Department of Energy. Geothermal Division.; United States. Department of Energy. Office of Scientific and Technical Information.
OCLC Number: 727307116
Notes: Published through the Information Bridge: DOE Scientific and Technical Information.
11/01/1980.
"Doe/id/12079-23."
Evans, S.H. Jr.; Brown, F.H.
Description: pages : 27 : digital, PDF file.
Responsibility: argon age dating, 1980.

Abstract:

A significant improvement in efficiency of the K-Ar laboratory was brought about by completion of a second extraction line. Two extractions can now be done routinely each day and the ³⁸Ar spike ratios of the new table will permit dating of much younger samples than previously. Extensive K-Ar dating of samples from the Mineral Mountains shows intervals of silicic volcanism at 0.5, 0.8 and 7.5 m.y. K-Ar dating of plutonic units does not present a consistent picture, however. Plutonic events 35 to 40 m.y., 29 m.y. and 19 to 21 m.y. ago are suggested but interpretation must be considered preliminary. Joint programs with the US Geological Survey now underway to study the Rb-Sr and U-Pb systematics of the Mineral Mountains pluton should aid in unravelling its history. Dating of basalts from the Cove Creek Domes/Twin Peaks area, Utah, has aided in delineating the timing of basaltic volcanism. This adds to the already extensive data on the chronology of volcanic activity in the area. Dating of samples from the Beowawe Known Geothermal Resources Area, Nevada have confirmed earlier dates indicating major volcanism took place 38 m.y. ago and 17 to 16 m.y. ago.

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