Portal de Periódicos da CAPES

K-Ar ages of some volcanic rocks from the Cook and Austral Islands

1975; Geological Society of America; Volume: 86; Issue: 10 Linguagem: Inglês

10.1130/0016-7606(1975)86 2.0.co;2

1943-2674

G. Brent Dalrymple, Richard D. Jarrard, David A. Clague,

Geology and Paleoclimatology Research

Research Article| October 01, 1975 K-Ar ages of some volcanic rocks from the Cook and Austral Islands G. BRENT DALRYMPLE; G. BRENT DALRYMPLE 1U.S. Geological Survey, Menlo Park, California 94025 Search for other works by this author on: GSW Google Scholar R. D. JARRARD; R. D. JARRARD 2Marine Physical Laboratory, Scripps Institution of Oceanography, La Jolla, California 920374Present address: (Jarrard) Department of Geology, University of California, Santa Barbara, California 93106; (Clague) U.S. Geological Survey, Menlo Park, California 94025. Search for other works by this author on: GSW Google Scholar D. A. CLAGUE D. A. CLAGUE 3Geological Research Division, Scripps Institution of Oceanography, La Jolla, California 920374Present address: (Jarrard) Department of Geology, University of California, Santa Barbara, California 93106; (Clague) U.S. Geological Survey, Menlo Park, California 94025. Search for other works by this author on: GSW Google Scholar Author and Article Information G. BRENT DALRYMPLE 1U.S. Geological Survey, Menlo Park, California 94025 R. D. JARRARD 2Marine Physical Laboratory, Scripps Institution of Oceanography, La Jolla, California 920374Present address: (Jarrard) Department of Geology, University of California, Santa Barbara, California 93106; (Clague) U.S. Geological Survey, Menlo Park, California 94025. D. A. CLAGUE 3Geological Research Division, Scripps Institution of Oceanography, La Jolla, California 920374Present address: (Jarrard) Department of Geology, University of California, Santa Barbara, California 93106; (Clague) U.S. Geological Survey, Menlo Park, California 94025. Publisher: Geological Society of America First Online: 01 Jun 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (1975) 86 (10): 1463–1467. https://doi.org/10.1130/0016-7606(1975)86 2.0.CO;2 Article history First Online: 01 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation G. BRENT DALRYMPLE, R. D. JARRARD, D. A. CLAGUE; K-Ar ages of some volcanic rocks from the Cook and Austral Islands. GSA Bulletin 1975;; 86 (10): 1463–1467. doi: https://doi.org/10.1130/0016-7606(1975)86 2.0.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGSA Bulletin Search Advanced Search Abstract K-Ar age measurements on 19 volcanic rocks from Rurutu, Mangaia, Rarotonga, and Aitutaki in the Cook-Austral chain do not show a systematic increase in the age of the volcanoes to the west-northwest away from Macdonald Seamount as predicted by the melting-spot hypothesis and suggested by geomorphic evidence. Ages determined for alkalic basalt samples from Rurutu range from 1.02 to 1.09 m.y., for Mangaia from 16.6 to 18.9 m.y., and for Aitutaki from 0.66 to 0.77 m.y. Two distinct periods of volcanism on Rarotonga were dated at 1.8 and 1.2 m.y. B.P. The relation between the dated units and the main shield-building stage of these volcanoes is uncertain and will remain so until better data on the eruption history and mode of formation of volcanoes in the chain are available. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.