|
|
 |
|||||||||||||||||
|
|||||||||||||||||
 |
|||||||||||||||||
| JOURNAL HOME | HELP | CONTACT PUBLISHER | SUBSCRIBE | ARCHIVE | SEARCH | TABLE OF CONTENTS |
1 W. M. Keck Foundation for Isotope Geochemistry, Department of Earth and Space Sciences, University of California, Los Angeles, California 90095-1567, USA
Ion microprobe U-Pb isotope analyses of zircons from fallout and intercalated ash-flow deposits of the early, most chemically evolved Bishop Tuff (east-central California) yield a weighted mean age of 823 ± 11 ka (mean square of weighted deviates, MSWD = 0.8; n = 22). A similar mean age of 839 ± 36 ka (MSWD = 0.6, n = 15) obtained on unpolished zircon rims suggests that the difference between these ages and that of 760 ka for the Bishop Tuff obtained by recent Ar isotope determinations may be largely analytical in origin. Considerations based only on the effect of 230Th-234U disequilibria on the U-Pb ages yield an apparent maximum mean crystal residence time for zircon of 
100 k.y. The zircon residence times are significantly shorter than those inferred from previous estimates for the timing of phenocryst growth and suggest that, once evolved, the early Bishop Tuff rhyolite was not stored for long before erupting.
Key Words: Long Valley caldera • residence time • zircon • 238U-206Pb • ion probe data • rhyolites • magma chamber
This article has been cited by other articles:
|
|
 |
|
  C. J. N. Wilson and B. L. A. Charlier Rapid Rates of Magma Generation at Contemporaneous Magma Systems, Taupo Volcano, New Zealand: Insights from U-Th Model-age Spectra in Zircons J. Petrology, May 13, 2009; (2009) egp023v1. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 I. Bindeman Oxygen Isotopes in Mantle and Crustal Magmas as Revealed by Single Crystal Analysis Reviews in Mineralogy and Geochemistry, January 1, 2008; 69(1): 445 - 478. [Full Text] [PDF]
|
|
|
|
|
|
K. M. Cooper and M. R. Reid Uranium-series Crystal Ages Reviews in Mineralogy and Geochemistry, January 1, 2008; 69(1): 479 - 544. [Full Text] [PDF]
|
|
|
|
|
|
F. Costa, R. Dohmen, and S. Chakraborty Time Scales of Magmatic Processes from Modeling the Zoning Patterns of Crystals Reviews in Mineralogy and Geochemistry, January 1, 2008; 69(1): 545 - 594. [Full Text] [PDF]
|
|
|
|
 |
|
 J.L. Crowley, B. Schoene, and S.A. Bowring U-Pb dating of zircon in the Bishop Tuff at the millennial scale Geology, December 1, 2007; 35(12): 1123 - 1126. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 S. Turner and F. Costa Measuring Timescales of Magmatic Evolution Elements, August 1, 2007; 3(4): 267 - 272. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
W. Hildreth and C. J. N. Wilson Compositional Zoning of the Bishop Tuff J. Petrology, May 1, 2007; 48(5): 951 - 999. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
D.A. Wark, W. Hildreth, F.S. Spear, D.J. Cherniak, and E.B. Watson Pre-eruption recharge of the Bishop magma system Geology, March 1, 2007; 35(3): 235 - 238. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
B. L. A. CHARLIER, C. J. N. WILSON, J. B. LOWENSTERN, S. BLAKE, P. W. VAN CALSTEREN, and J. P. DAVIDSON Magma Generation at a Large, Hyperactive Silicic Volcano (Taupo, New Zealand) Revealed by U-Th and U-Pb Systematics in Zircons J. Petrology, January 1, 2005; 46(1): 3 - 32. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
J. S. MILLER and J. L. WOODEN Residence, Resorption and Recycling of Zircons in Devils Kitchen Rhyolite, Coso Volcanic Field, California J. Petrology, November 1, 2004; 45(11): 2155 - 2170. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
D. C. SNYDER, E. WIDOM, A. J. PIETRUSZKA, and R. W. CARLSON The Role of Open-System Processes in the Development of Silicic Magma Chambers: a Chemical and Isotopic Investigation of the Fogo A Trachyte Deposit, Sao Miguel, Azores J. Petrology, April 1, 2004; 45(4): 723 - 738. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
D. R. Cole, P. B. Larson, L. R. Riciputi, and C. I. Mora Oxygen isotope zoning profiles in hydrothermally altered feldspars: Estimating the duration of water-rock interaction Geology, January 1, 2004; 32(1): 29 - 32. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
H. E. CATHEY and B. P. NASH The Cougar Point Tuff: Implications for Thermochemical Zonation and Longevity of High-Temperature, Large-Volume Silicic Magmas of the Miocene Yellowstone Hotspot J. Petrology, January 1, 2004; 45(1): 27 - 58. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
J.A. Wolff and F.C. Ramos Pb isotope variations among Bandelier Tuff feldspars: No evidence for a long-lived silicic magma chamber Geology, June 1, 2003; 31(6): 533 - 536. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
I. N. Bindeman Crystal sizes in evolving silicic magma chambers Geology, April 1, 2003; 31(4): 367 - 370. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
M. Condomines, M. Condomines, P.-J. Gauthier, and O. Sigmarsson Timescales of Magma Chamber Processes and Dating of Young Volcanic Rocks Reviews in Mineralogy and Geochemistry, January 1, 2003; 52(1): 125 - 174. [Full Text] [PDF]
|
|
|
|
|
|
S. A. Bowring, S. A. Bowring, and M. D. Schmitz High-Precision U-Pb Zircon Geochronology and the Stratigraphic Record Reviews in Mineralogy and Geochemistry, January 1, 2003; 53(1): 305 - 326. [Full Text] [PDF]
|
|
|
|
|
|
O. BACHMANN, M. A. DUNGAN, and P. W. LIPMAN The Fish Canyon Magma Body, San Juan Volcanic Field, Colorado: Rejuvenation and Eruption of an Upper-Crustal Batholith J. Petrology, August 1, 2002; 43(8): 1469 - 1503. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
J. E. Gardner, P. W. Layer, and M. J. Rutherford Phenocrysts versus xenocrysts in the youngest Toba Tuff: Implications for the petrogenesis of 2800 km3 of magma Geology, April 1, 2002; 30(4): 347 - 350. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
J.A. Winick, W.C. McIntosh, and N.W. Dunbar Melt-inclusion-hosted excess 40Ar in quartz crystals of the Bishop and Bandelier magma systems Geology, March 1, 2001; 29(3): 275 - 278. [Abstract] [Full Text] [PDF]
|
|
| JOURNAL HOME | HELP | CONTACT PUBLISHER | SUBSCRIBE | ARCHIVE | SEARCH | TABLE OF CONTENTS |
