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Genesis of the Smartville arc-ophiolite, Sierra Nevada foothills, CaliforniaRare earth element analyses of metavolcanic rocks from the Smartville, Calif. ophiolite divide the uniform suite of pillowed and massive lavas into the lower part consisting of massive, brecciated tholeiites, an intrusive dike-sill complex, and part of a plutonic suite. The tholeiites are light REE depleted with a (Ce)N range of 6.5 to 26.0 and (Yb)N of 6.0 to 30.0; it is suggested that the tholeiites were produced by partial melting of a LREE depleted source similar to MORB. The upper part of the volcanic pile is comprised of basaltic-andesitic flows and interbedded coarse to fine volcanic sediments; these 'calc-alkaline' rocks are light REE enriched with the (Ce)N range of 17.0-28.0 and (Yb)N of 8.0 to 12.0. Finally, petrographic investigations of volcanic sediments and sulfide ore deposits in the lava show that the ophiolite formed near a group of active submarine and subareal volcanoes.
Document ID
19810031082
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Menzies, M.
(NASA Lyndon B. Johnson Space Center Houston, TX, United States)
Blanchard, D.
(NASA Johnson Space Center Houston, Tex., United States)
Xenophontos, C.
(Ministry of Agriculture and Natural Resources Geological Survey Dept., Nicosia, Cyprus)
Date Acquired
August 11, 2013
Publication Date
January 1, 1980
Publication Information
Publication: American Journal of Science
Volume: 280-A
Subject Category
Earth Resources And Remote Sensing
Accession Number
81A15486
Funding Number(s)
CONTRACT_GRANT: NSF EAR-78-03640
CONTRACT_GRANT: NSF EAR-75-21869
CONTRACT_GRANT: NSR-09-051-001
Distribution Limits
Public
Copyright
Other

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