Date File Created Name of Creator 4/27/2011 Josh Rosera (UNC) GeoRef Data 2010-098069 DN GeoRef TI "Magmatic lobes as ""snapshots"" of magma chamber growth and evolution in large, composite batholiths: An example from the Tuolumne intrusion, Sierra Nevada, California" AU "Memeti, Valbone; Paterson, Scott; Matzel, Jennifer; Mundil, Roland; Okaya, David" AF "Department of Earth Sciences, University of Southern California, Los Angeles, California 90089, USA)" SO "Bulletin of the Geological Society of America. Vol. 122, no. 11-12, pp. 1912-1931. Nov 2010." IS 0016-7606 DE Age distribution Ages Biotite Cathodoluminescence Chambers Compositions Contacts Continuous Contrasts Cores Cross Sections Crystallization Crystals Dikes Direction Forming Fractionation Fractions Grades Grain sizes Granite Gray Scale Growth Horizontal Indexes Intrusion Lakes Lobes Location Magma Magma chambers Mapping Materials Military Personnel Minerals Modeling Models Moving Occurrences Plots Plutons Potential Pulses Recycling Relationships Rock Shades Sheets Sliding Small Solidus Square Texture Thermal Two-Dimensional Vertical Zircon Zones Zoning AB "Precise chemical abrasion-thermal ionization mass spectrometry (CA-TIMS) U-Pb zircon ages in combination with detailed field mapping, super(40)Ar/ super(39)Ar thermochronology, and finite difference thermal modeling in the magmatic lobes of the Tuolumne batholith characterize these 10-60 km super(2) bodies as shorter-lived, simpler magmatic systems that represent increments of batholith growth. Lobes provide shorter-term records of internal and external processes that are potentially obliterated in the main body of long-lived, composite batholiths. Zircon ages complemented by thermal modeling indicate that lobe-sized magma chambers were present between 60.2 and 1 m.y., representing only a small fraction of the total duration of melt presence in the main body. During these shorter intervals, a concentric pattern of normal compositional zoning formed during inward crystallization and widespread zircon recycling in the lobes. Lobes largely evolved as individual magma bodies that did not interact significantly with the main, more complex magma chamber(s). Antecrystic zircons and the range of autocrysts, used to track the extent of interconnected melt, record only a limited range of ages and have contrasting zircon populations to those found in the same units in the main batholith. We consider lobes to either be single batches formed during continuous magma flow or multiple, quickly coalescing pulses that in either case formed separate magma chambers that failed to amalgamate with other compositionally distinct pulses such as those occurring in the central batholith. Zircon age comparisons between all four lobes and the main body imply that growth of the Tuolumne intrusion was not stationary, but that the locus of magmatism shifted both inward and northwestward." LA English PY 2010 PT Serial; Analytic CP United States (USA) CY "GeoRef, Copyright 2010, American Geological Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States | Reference includes data supplied by the Geological Society of America, Boulder, CO, USA, United States" AN 2010-098069 Sample Data Item LatDD LongDD Loc_prec Age Max_age Min_age Location_Name Rock_Type Rock_Class Material State Units dd dd Ma Ma Ma Method 1 1 2 2 2 Sample Name KCL428 37.76491523 -119.278422 0.0001 94.4 94.7 94.1 Kuna Crest Plutonic Tonalite Zircon CA 5183 37.74876696 -119.1937003 0.0001 93.6 94 93.2 Kuna Crest Plutonic Granodiorite Zircon CA NHDL889 38.09511868 -119.5858226 0.0001 89.6 89.8 89.4 Half Dome Plutonic Granite Zircon CA NHDL922 38.10203472 -119.616324 0.0001 90.6 90.8 90.4 Half Dome Plutonic Granodiorite Zircon CA CPL76 38.19528725 -119.4923512 0.0001 87.4 87.8 87 Cathedral Peak Plutonic Granodiorite Zircon CA CPL89 38.16235911 -119.4943603 0.0001 85.1 86 84.2 Cathedral Peak Plutonic Granite Zircon CA RE007 37.67126894 -119.3285814 0.0001 90.1 90.2 90 Half Dome Plutonic Granodiorite Zircon CA T684Z 37.67908826 -119.3253028 0.0001 89.7 89.9 89.5 Half Dome Plutonic Granite Zircon CA Method Data 1 TABLE 2010-098069 2 U-PBC:ZIRC 464