Cordilleran Section (104th Annual) and Rocky Mountain Section (60th Annual) Joint Meeting (19–21 March 2008)

Session No. 18
Thursday, 20 March 2008: 1:30 PM-4:30 PM

S3. Mafic-Silicic Magmatism: Crystallization Histories, Magma Interactions, and Eruption Mechanisms II

 

Terry L. Spell and Eugene Smith, Conveners
Paper #
Start Time
1
1:30 PM
"DETRITAL" ZIRCONS ORIGINATING BY MAGMATIC EROSION OF PRE-EXISTING INTRUSIONS AT THE SOUFRIÈRE VOLCANIC CENTER (SAINT LUCIA, LESSER ANTILLES)
SCHMITT, Axel K., Earth and Space Sciences, University of California, Los Angeles, CA 90095, MCCAMMON, Miles, Earth and Space Sciences, University of California, 595 Charles Young Dr E, Los Angeles, CA 90095, STOCKLI, Daniel F., Department of Geology, University of Kansas, 120 Lindley Hall, Lawrence, KS 66045-761 and LINDSAY, Jan M., School of Geography, Geology, and Environmental Science, University of Auckland, Private Bag 92019, Auckland, 1142, New Zealand, axel@oro.ess.ucla.edu, axel@oro.ess.ucla.edu
2
1:50 PM
THE UPPER CRUSTAL EVOLUTION OF AN ERUPTED BATHOLITH: EVIDENCE FROM CRYSTAL-SCALE RB/SR ISOTOPIC HETEROGENEITIES IN THE FISH CANYON MAGMATIC SYSTEM, COLORADO
BACHMANN, Olivier, Earth Space Sciences, University of Washington, Box 351310, Seattle, WA 98195-1310, CHARLIER, Bruce, Department of Earth and Environmental Sciences, The Open University, Walton Hall, Milton Keynes, MK7 6AA, England, DAVIDSON, Jon, Earth Sciences, Durham University, Durham, DH1 3LE, United Kingdom, DUNGAN, Michael A., Section des Sciences de la Terre, Université de Genève, 13, rue des Maraichers, Genève, 1205, Switzerland and MORGAN, Dan J., School of Earth and Environment, University of Leeds, Earth Science building, Leeds, LS2 9JT, England, bachmano@u.washington.edu, bachmano@u.washington.edu
3
2:10 PM
USING COMBINED GEOCHEMICAL AND TEXTURAL QUANTIFICATION OF CRYSTAL POPULATIONS TO CONSTRAIN MAGMA CHAMBER PROCESSES IN SILICIC VOLCANOES: AN EXAMPLE FROM MOUNT HOOD, OREGON
DARR, Cristina M., Department of Geosciences, Oregon State University, 104 Wilkinson Hall, Corvallis, OR 97331 and KENT, Adam J.R., College of Earth, Ocean & Atmospheric Sciences, Oregon State University, 104 Ocean Admin, Corvallis, OR 97331, adam.kent@geo.oregonstate.edu, adam.kent@geo.oregonstate.edu
4
2:30 PM
ALLANITE AND CHEVKINITE AS ABSOLUTE CHRONOMETERS OF RHYOLITE DIFFERENTIATION
VAZQUEZ, Jorge A., U.S. Geological Survey, 345 Middlefield Road MS 910, Menlo Park, CA 94025, jvazquez@usgs.gov, jvazquez@usgs.gov
 
2:50 PM
Break
5
3:10 PM
HIGH-PRECISION CHRONOLOGIES OF MAGMA CHAMBER DYNAMICS: ID-TIMS U-PB DATING OF SMALL CHEMICAL DOMAINS
CROWLEY, James L., Department of Geosciences, Boise State University, 1910 University Drive, Boise, ID 83725-1535, BOWRING, Samuel, EARTHTIME, 77 Moss Ave, MIT54-1120, Cambridge, MA 02139 and SCHMITZ, Mark, Department of Geosciences, Boise State University, 1910 University Drive, Boise, ID 83725, JimCrowley@boisestate.edu, JimCrowley@boisestate.edu
6
3:30 PM
THE SPIRIT MOUNTAIN BATHOLITH AND SECRET PASS CANYON VOLCANIC CENTER: PERSPECTIVES ON SILICIC MAGMATISM FROM THE MID TO UPPER CRUST
WALKER Jr, Barry A., Geosciences, Oregon State University, Corvallis, OR 97330, LANG, Nicholas P., Department of Earth and Planetary Sciences, University of Tennessee, Knoxville, TN 37996, CLAIBORNE, Lily L., Earth and Environmental Sciences, Vanderbilt University, Nashville, TN 37235, MILLER, Calvin F., Dept. of Earth and Environmental Sciences, Vanderbilt University, Nashville, TN 37235 and HAZLETT, Richard W., Geology, Pomona College, Claremont, CA 91711, walkerb@geo.oregonstate.edu, walkerb@geo.oregonstate.edu
7
3:50 PM
CONNECTING HIGH-SILICA, RHYOLITE-HOSTED PHENOCRYSTS TO POTENTIAL CRYSTAL MUSH INTRUSIVE COMPLEMENTS: INSIGHTS FROM BAITOUSHAN VOLCANO AND VALLES CALDERA
RAMOS, Frank C., Geological Sciences, New Mexico State University, Las Cruces, NM 88003, GILL, James B., Department of Earth and Planetary Sciences, University of California, Santa Cruz, Santa Cruz, CA 95064, WOLFF, John, School of Earth & Environmental Sciences, Washington State University, Pullman, WA 99164 and RODGERS, Sarah L., Department of Geological Sciences, Central Washington University, 400 E University Way, Ellensburg, WA 98926, framos@nmsu.edu, framos@nmsu.edu
8
4:10 PM
HETEROGENEOUS KFS MEGACRYST SIZE AND ABUNDANCE VARIATION IN THE NORTHERN CATHEDRAL PEAK LOBE, TUOLUMNE BATHOLITH
MEMETI, Vali, Department of Earth and Planetary Sciences, Washington University in St. Louis, 1 Brookings Dr, St. Louis, MO 63130-4862 and PATERSON, Scott, Department of Earth Sciences, University of Southern California, Los Angeles, CA 90089-0740, memeti@usc.edu, memeti@usc.edu
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