Session: Volcanology, Igneous and Metamorphic Petrology (Posters) (Rocky Mountain (56th Annual) and Cordilleran (100th Annual) Joint Meeting (May 3

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1

45

LA-ICP-MS U-PB ZIRCON DATING OF THE BUCKHORN MOUNTAIN INTRUSIONS. BASEMENT FINGERPRINTS AND IMPLICATIONS FOR THE EVOLUTION OF THE ACCRETED QUESNEL TERRANE

GASPAR, Miguel¹, VERVOORT, Jeffery D.¹, KNAACK, Charles¹ and MEINERT, Lawrence², (1)Department of Geology, Washington State Univ, Pullman, WA 99164-2812, (2)Department of Geology, Smith College, Clark Science Center, NorthHampton, MA 01063, vervoort@wsu.edu, vervoort@wsu.edu

2

46

MAGMA MIXING/MINGLING IN A HETEROGENEOUS MULTI-PULSE MAGMATIC SYSTEM: EVIDENCE FROM JACKASS LAKES PLUTON, CENTRAL SIERRA NEVADA BATHOLITH

COYNE, Claire M., PIGNOTTA, Geoffrey S., PATERSON, Scott R. and ANDERSON, J. Lawford, Department of Earth Sciences, Univ of Southern California, Los Angeles, CA 90089-0740, ccoyne@usc.edu, ccoyne@usc.edu

3

47

STRUCTURE AND PETROLOGY OF WINDERMERE AGE INTRUSIONS IN THE NORTHERN ROCKY MOUNTAINS

BURTIS, Erik W.¹, SEARS, James W.¹ and CHAMBERLAIN, Kevin R.², (1)Geology, The Univ of Montana, 32 Campus Drive, Missoula, MT 59801, (2)Geology and Geophysics, The Univ of Wyoming, P.O. Box 3006, Laramie, WY 82071, ewdb92@yahoo.com, ewdb92@yahoo.com

4

48

PETROLOGY, ISOTOPE GEOCHEMISTRY, AND GEOCHRONOLOGY OF A MULTIPLY METAMORPHOSED GRANITOID EXOTIC BLOCK IN A FRANCISCAN OLISTOSTROME MELANGE, CAZADERO, CALIFORNIA

ERICKSON, Rolfe C., Geology, Sonoma State Univ, 1801 E. Cotati Avenue, Rohnert Park, CA 94928, MATTINSON, Jim, Department of Geological Sciences, Univ of California at Santa Barbara, Santa Barbara, CA 93106, DUMITRU, Trevor A., Geological and Environmental Sciences, Stanford Univ, Bldg 320, Lomita Mall, Stanford, CA 94305-2115 and SHARP, Warren, Berkeley Geochronology Center, 2455 Ridge Rd, Berkeley, CA 94709, rolfe.erickson@sonoma.edu, rolfe.erickson@sonoma.edu

5

49

TRACE ELEMENT GEOCHEMISTRY OF THE WARD CREEK METAMORPHIC SEQUENCE AND BIG OAT CREEK METABASALT, CAZADERO, CA

SWANSON, Nathan, ERICKSON, Rolfe C. and PLUMMER, Erica, Geology, Sonoma State Univ, 1801 E. Cotati Avenue, Rohnert Park, CA 94928, ndigg3147@hotmail.com, ndigg3147@hotmail.com

6

50

PETROLOGY OF A GREENSCHIST FACIES METATONALITE BLOCK IN THE FRANCISCAN COMPLEX, JENNER, CA

MANGEL, Matthew, Geology, Sonoma State Univ, 1801 East Cotati Ave, Rohnert Park, CA 94928 and ERICKSON, Rolfe C., Geology, Sonoma State Univ, 1801 E. Cotati Avenue, Rohnert Park, CA 94928, mattmangel@comcast.net, mattmangel@comcast.net

7

51

KAGUYAK VOLCANO AND ITS HOLOCENE CALDERA, ALASKA PENINSULA

FIERSTEIN, Judy and HILDRETH, Wes, U.S. Geol Survey, 345 Middlefield Road, MS-910, Menlo Park, CA 94025, jfierstn@usgs.gov, jfierstn@usgs.gov

8

52

TEPHROSTRATIGRAPHY OF ASH FALL TUFFS FROM THE YELLOWSTONE HOTSPOT IN SEDIMENTARY INTERBEDS OF THE COLUMBIA RIVER BASALT GROUP

NASH, Barbara P., Department of Geology and Geophysics, Univ of Utah, Salt Lake City, UT 84112 and PERKINS, Michael E., Department of Geology and Geophysics, Univ of Utah, 135 South, 1460 East, Salt Lake City, UT 84112, bpnash@mines.utah.edu, bpnash@mines.utah.edu

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53

THOLEIITE TREND OBSERVED IN THE SPRINGFIELD QUADRANGLE

MC CASLIN, Glenn R., Geology, Southern Oregon Univ, Ashland, OR 97539, glenn@mind.net, glenn@mind.net

10

54

STRUCTURAL TRENDS AND CONTROL ON VOLCANIC FEATURES ON ST. PAUL ISLAND, PRIBILOF ISLANDS, ALASKA

WINER, Grace Sherwood and FEELEY, Todd C., Department of Earth Sciences, Montana State Univ, Bozeman, MT 59717, gracesw@earthlink.net, gracesw@earthlink.net

11

55

VOLCANICLASTIC STRATIGRAPHY OF NORTHERN VIDIDALSFJALL: AN ABANDONED ICELANDIC RIFT

RIDER, Deanne E. and JORDAN, Brennan T., Department of Geology, The College of Wooster, Wooster, OH 44691, drider@wooster.edu, drider@wooster.edu

12

56

VOLCANIC STRATIGRAPHY AND STRUCTURES ASSOCIATED WITH THE ERUPTION OF THE EARLY MIOCENE PINTO PEAK LACCOLITH, IRON AXIS MAGMATIC PROVINCE, SOUTHWEST UTAH

HACKER, David B., Department of Geology, Kent State Univ, Kent, OH 44242, dhacker@kent.edu, dhacker@kent.edu

13

57

YTTRIA-STABILIZED ZIRCONIA CRYSTALS: SYNTHESIS AND CRYSTAL STRUCTURE

KIM, Won-Sa, Dept. of Geology, Chungnam National Univ, Taejon, 305-764, South Korea, kimw@cnu.ac.kr, kimw@cnu.ac.kr

Rocky Mountain (56th Annual) and Cordilleran (100th Annual) Joint Meeting (May 3–5, 2004)

Volcanology, Igneous and Metamorphic Petrology (Posters)