| Abstract: | Using a continuous laser and resistance furnace, we have measured ages on Quaternary plagioclase with an absolute precision of about ??30 ka and on Quaternary sanidine with a relative precision of better than 1%. Such precision was achieved by using low-temperature heating steps to remove much of the nonradiogenic argon contamination. Plagioclase is one of the most common mineral phases in volcanic rocks; thus, these procedures will be widely applicable to many problems for which precise radiometric age control has not been available. We studied plagioclase and plagioclase-sanidine concentrates from the oldest and the three largest silicic ash-flow deposits of the Taupo Volcanic Zone, New Zealand, one of the world‘s largest and most active volcanic systems. The results are in close agreement with new magnetostratigraphic data, suggesting that existing fission-track age determinations significantly underestimate the age of older units, and shift the inception of Taupo Vaolcanic Zone volcanism back to at least 1600 ka. -from Authors |
| Genre: | Article |
| ProdID: | 70016650 |
| Citation Author: | Pringle, M. S.; McWilliams, M.; Houghton, B. F.; Lanphere, M. A.; Wilson, C. J. N. |
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| Citation End Page: | 534 |
| Citation Issue: | 6 |
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| Citation Language: | English |
| Citation Larger Work Title: | Geology |
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| Citation Number Of Pages: | 4 |
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| Citation Search Results Text: | 40Ar/39Ar dating of Quaternary feldspar: examples from the Taupo Volcanic Zone, New Zealand; 1992; Article; Journal; Geology; Pringle, M. S.; McWilliams, M.; Houghton, B. F.; Lanphere, M. A.; Wilson, C. J. N. |
| Citation Start Page: | 531 |
| Citation Volume: | 20 |
| Citation Year: | 1992 |
| Type: | citation/reference |
| Text: | 40Ar/39Ar dating of Quaternary feldspar: examples from the Taupo Volcanic Zone, New Zealand; 1992; Article; Journal; Geology; Pringle, M. S.; McWilliams, M.; Houghton, B. F.; Lanphere, M. A.; Wilson, C. J. N. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Wed, 1 Jan 1992 00:00 -0600 |
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