Date File Created Name of Creator 2/7/2011 Josh Rosera - UNC GeoRef Data 2004-047843 DN GeoRef TI "Rethinking the emplacement and evolution of zoned plutons; geochronologic evidence for incremental assembly of the Tuolumne Intrusive Suite, California" AU "Coleman, Drew S; Gray, Walt; Glazner, Allen F" AF "Department of Geological Sciences, CB 3315 Mitchell Hall, University of North Carolina,Chapel Hill, North Carolina 27599-3315, USA" SO Geology (Boulder) 32.5 (May 2004): 433-436 IS 0091-7613 CD GLGYBA DE absolute age; California; Cretaceous; dates; emplacement; igneous rocks; intrusions; magma chambers; magmas; Mesozoic; nesosilicates; orthosilicates; plutonic rocks; plutons; Sierra Nevada; silicates; Tuolumne County California; Tuolumne Suite; U/Pb; United States; Upper Cretaceous; zircon; zircon group; zoning AB "New U-Pb geochronologic data indicate that the Tuolumne Intrusive Suite, California, was assembled over a period of at least 10 m.y. between 95 and 85 Ma, and that the Half Dome Granodiorite intruded over a period approaching 4 m.y. Simple thermal considerations preclude the possibility that a magma chamber the size of the Half Dome pluton could have existed as a liquid at shallow crustal depths for that long. Rather, field evidence for sheeting along the margins of the suite, the range of ages, and the regular decrease of ages toward the center of the suite and within individual plutons suggest incremental assembly. Geochronologic evidence for incremental assembly is consistent with the failure of geophysical methods to detect large magma chambers with more than approximately 20% melt, even in active volcanic areas. Because it is unlikely that the individual plutons composing the Tuolumne ever coexisted as liquid-rich magmas, the chemical evolution of the suite cannot be the result of simple fractionation and/or mixing between exposed units, but instead must reflect processes occurring during magma generation." LA English FE "References: 33, illus. incl. geol. sketch map" PY 2004 PT Serial; Analytic CP United States (USA) CL "05A Igneous and metamorphic petrology, 03 Geochronology" CY "GeoRef, Copyright 2007, American Geological Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States" AN 2004-047843 Sample Data Item LatDD LongDD Loc_prec Age Max_age Min_age Rock_Type Rock_Class Location_Name Material State Units dd dd ma ma ma Method 1 1 2 2 2 Sample Name KGA-1 37.846277 -119.488675 0.0001 93.1 93.2 93 Plutonic Tonalite Tuolumne Intrusive Suite Zircon California HD01-35 37.907426 -119.265313 0.0001 93.5 94.2 92.8 Plutonic Granodiorite Tuolumne Intrusive Suite Zircon California Y01-5 37.868606 -119.265214 0.0001 92.8 92.9 92.7 Plutonic Granodiorite Tuolumne Intrusive Suite Zircon California HD01-49 37.747346 -119.570727 0.0001 91.7 91.9 91.5 Plutonic Granodiorite Tuolumne Intrusive Suite Zircon California HD01-43 37.745951 -119.532414 0.0001 91.1 91.2 91 Plutonic Granodiorite Tuolumne Intrusive Suite Zircon California HD02-111 37.745117 -119.385875 0.0001 88.8 89.6 88 Plutonic Granodiorite Tuolumne Intrusive Suite Zircon California HD01-2 37.749529 -119.544486 0.0001 90.6 91.2 90 Plutonic Granodiorite Tuolumne Intrusive Suite Zircon California HD02-102 37.922164 -119.296683 0.0001 88.8 90.1 87.5 Plutonic Granodiorite Tuolumne Intrusive Suite Zircon California Method Data 1 TABLE 2004-047843 2 U-PBC:ZIRC 306