Geological Society of America

8:15 AM

A NEW LOOK AT IRON OXIDE-APATITE AND IRON OXIDE-COPPER-GOLD-RARE EARTH ELEMENT DEPOSITS IN THE MESOPROTEROZOIC ST. FRANCOIS MOUNTAINS TERRANE OF SOUTHEAST MISSOURI

John F. Slack, U.S. Geological Survey, Reston, VA and Warren C. Day, Denver, CO and Anne McCafferty, Denver, CO and Cheryl Seeger, Missouri Geological Survey, Rolla, MO and John L. Nold, University of Central Missouri, Warrensburg, MO

228633 (Technical Sessions)

8:30 AM

STABLE ISOTOPE GEOCHEMISTRY OF THE PEA RIDGE IRON OXIDE-RARE EARTH ELEMENT DEPOSIT, ST. FRANCOIS MOUNTAINS, SOUTHEASTERN MISSOURI: TEMPERATURE OF ORE FORMATION, SOURCE OF HYDROTHERMAL FLUID, AND SOURCE OF SULFUR

Craig Johnson, US Geological Survey, Denver, CO and Warren C. Day, Denver, CO and Robert O. Rye, USGS, Denver, CO

229690 (Technical Sessions)

8:45 AM

MICROTHERMOMETRIC AND ION RATIO ANALYSES OF FLUID INCLUSIONS FROM THE PEA RIDGE IRON OXIDE-APATITE (IOA) AND BOSS-BIXBY IRON OXIDE-COPPER-GOLD (IOCG) DEPOSITS SUPPORT A MAGMATIC-HYDROTHERMAL ORIGIN

A.H. Hofstra, U.S.G.S., Denver, CO and C.J. Meighan, USGS, Denver, CO and Poul Emsbo, USGS, Denver, CO

225094 (Technical Sessions)

9:00 AM

U-PB AND RE-OS GEOCHRONOLOGY OF REE-RICH BRECCIA PIPES FROM THE MESOPROTEROZOIC PEA RIDGE FE-REE-AU DEPOSIT, ST. FRANCOIS MOUNTAINS, MISSOURI

John Aleinikoff, U.S. Geological Survey, Denver, CO and David Selby, University of Durham, Science Labs, Durham, N/A and Warren C. Day, Denver, CO and John F. Slack, US Geological Survey, Reston, VA and Renee M. Pillers, Denver, CO and Cheryl Seeger, Missouri Geological Survey, Rolla, MO and Iain M. Samson, University of Windsor, Windsor, ON

225117 (Technical Sessions)

9:15 AM

RATTLESNAKE HILLS AND BEAR LODGE MOUNTAINS CARBONATITE-ALKALIC IGNEOUS COMPLEXES, WYOMING: REE'S AND OTHER TRACE-ELEMENT GEOCHEMISTRY

Genet I. Duke, Arkansas Tech University, Russellville, AR and Carol Frost, University of Wyoming, Laramie, WY

230976 (Technical Sessions)

9:30 AM

TIMING OF CARBONATITE MAGMATISM IN THE BEAR LODGE ALKALINE COMPLEX, WY

Allen K. Andersen, Washington State University, Pullman, WA and Michael A. Cosca, USGS, Denver, CO and Peter Larson, Washington State University, Pullman, WA

233794 (Technical Sessions)

9:45 AM

VARIATIONS IN ECONOMIC REE DISTRIBUTION AT THE BEAR LODGE DEPOSIT, WY

Allen K. Andersen, Washington State University, Pullman, WA and Adrian D. Van Rythoven, Lakewood, CO and James G. Clark, Camas, WA and Peter Larson, Washington State University, Pullman, WA

232162 (Technical Sessions)

10:15 AM

MINERALOGY AND LATE STAGE ALTERATION OF THE MOUNTAIN PASS, CALIFORNIA, ULTRAPOTASSIC SILICATE INTRUSIVE ROCKS -PRELIMINARY REPORT

Douglas B. Stoeser, US Geol Survey, Denver, CO

231857 (Technical Sessions)

10:30 AM

AN INTEGRATED VIEW OF JURASSIC IRON-OXIDE-RICH HYDROTHERMAL SYSTEMS, SOUTHEASTERN CALIFORNIA AND WESTERN ARIZONA

James D. Girardi, University of Arizona, Tucson, AZ and Mark D. Barton, University of Arizona, Tucson, AZ

227810 (Technical Sessions)

10:45 AM

NIOBIUM PYROCHLORE MINERALIZATION IN AN IRON-RICH DOLOMITE CARBONATITE, ELK CREEK, NEBRASKA (USA)

Michael Joseph Blessington, University of Nebraska-Lincoln, Lincoln, NE and Richard M. Kettler, University of Nebraska-Lincoln, Lincoln, NE and Philip L. Verplanck, U.S. Geological Survey, Denver, CO and G. Lang Farmer, Univ. of Colorado, Boulder, CO

232551 (Technical Sessions)

11:00 AM

MINERALOGY, GEOCHEMISTRY, AND CHRONOLOGY OF THE CABALLO AND BURRO MOUNTAINS REE-BEARING EPISYENITES

Annelise M. Riggins, New MexicoTech, Socorro, NM and Nelia W. Dunbar, New MexicoTech, Socorro, NM and Virginia T. McLemore, New MexicoTech, Socorro, NM and Matthew, T. Heizler, New MexicoTech, Socorro, NM and William McIntosh, New MexicoTech, Socorro, NM

232231 (Technical Sessions)

11:15 AM

PROTEROZOIC FLUORBRITHOLITE-BEARING REE-RICH HYDROTHERMAL PODS AND VEINS FROM NEAR JAMESTOWN, COLORADO

Julien M. Allaz, University of Colorado Boulder, Boulder, CO and Charles R. Stern, University of Colorado Boulder, Boulder, CO and Philip M. Persson, University of Colorado Boulder, Boulder, CO and Markus B. Raschke, University of Colorado Boulder, Boulder, CO

227285 (Technical Sessions)

11:30 AM

DIURNAL TRENDS IN DISSOLVED REE CONCENTRATIONS IN A MINERALIZED WATERSHED, MONTEZUMA, COLORADO

Garrett Rue, University of Colorado - Boulder, Boulder, CO and Devin N. Castendyk, State University of New York, College at Oneonta, Oneonta, NY and Diane M. McKnight, University of Colorado, Boulder, CO

231347 (Technical Sessions)

11:45 AM

ROUND MOUNTAIN, TEXAS, LACCOLITH CAN BE A RELIABLE SOURCE OF HREE FOR US INDUSTRY AND DEFENSE

Philip Goodell, University of Texas at El Paso, El Paso, TX and Amed Gomez, University of Texas at El Paso, El Paso, TX and Nicole Kyger, University of Texas at El Paso, El Paso, TX

232586 (Technical Sessions)

T207 Evolution of REE-Enriched Carbonatite-Alkalic Rock Systems: In Honor of Daniel R. Shawe

Presentations