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Cordilleran Section - 103rd Annual Meeting (4–6 May 2007)

Session No. 7
Friday, 4 May 2007: 1:00 PM-5:30 PM

T13. New Developments in Understanding Cretaceous Crustal Structure in the North Cascades of Washington

 

Harold Stowell, Robert Miller and Douglas Tinkham, Advocates
Paper #
Start Time
 
1:00 PM
Introductory Remarks
1
1:05 PM
PLUTONISM AT DIFFERENT CRUSTAL LEVELS OF ARCS: INSIGHTS FROM THE ~5-40 KM (PALEODEPTH) NORTH CASCADES CRUSTAL SECTION, WASHINGTON
MILLER, Robert B., Dept Geology, San Jose State University, 1 Washington Sq, San Jose, CA 95192-0102, MATZEL, Jennifer, Berkeley Geochronology Ctr, 2455 Ridge Rd, Berkeley, CA 94709-1211 and PATERSON, Scott R., Department of Earth Sciences, University of Southern California, 3651 Trousdale Pkwy, Los Angeles, CA 90089, rmiller@geosun.sjsu.edu, rmiller@geosun.sjsu.edu
2
1:25 PM
PHASE EQUILIBRIA MODELING, PSEUDOMORPHS, AND CRUSTAL LOADING ALONG THE NORTHEAST MARGIN OF THE MOUNT STUART BATHOLITH, NORTH CASCADES, WA
TINKHAM, Doug, Department of Earth Sciences, Laurentian University, Sudbury, ON P3E 2C6, BULMAN, Gerrit, CH2M Hill, Deerfield Beach, FL 33441, STOWELL, Harold, Department of Geological Sciences, Univ of Alabama, Box 870338, Tuscaloosa, AL 35487-0338 and ZULUAGA, Carlos, Geociencias, Universidad Nacional de Colombia, Bogota, 14490, Colombia, dtinkham@laurentian.ca, dtinkham@laurentian.ca
3
1:45 PM
TIMING AND P-T CONDITIONS FOR PARTIAL MELTING AND INTRUSION IN THE NASON RIDGE MIGMATITIC GNEISS: NORTH CASCADES, WA
STOWELL, Harold, Department of Geological Sciences, Univ of Alabama, Box 870338, Tuscaloosa, AL 35487-0338, TINKHAM, Doug, Earth Sciences, Laurentian University, Sudbury, P3E 2C6, Canada, ZULUAGA, Carlos, Geociencias, Universidad Nacional de Colombia, Bogota, 14490, Colombia and BULMAN, Gerrit, CH2M Hill, Deerfield Beach, FL 33441, hstowell@geo.ua.edu, hstowell@geo.ua.edu
4
2:05 PM
GARNETS AND ZIRCONS AGREE: GEOCHRONOLOGIC CONSTRAINTS ON LATE CRETACEOUS LOADING AND METAMORPHISM IN THE CASCADES CORE, WA
BULMAN, Gerrit R., CH2M Hill, Deerfield Beach, FL 33441, STOWELL, Harold, Department of Geological Sciences, Univ of Alabama, Box 870338, Tuscaloosa, AL 35487-0338, TINKHAM, Doug, Earth Sciences, Laurentian University, Sudbury, P3E 2C6, Canada and ZULUAGA, Carlos, Geociencias, Universidad Nacional de Colombia, Bogota, 14490, Colombia, gbulman@ch2m.com, gbulman@ch2m.com
 
2:25 PM
Break
5
2:45 PM
METAMORPHIC EVOLUTION OF THE WENATCHEE BLOCK, SUIATTLE RIVER REGION, NORTH CASCADES, WASHINGTON
ISAACSON, Robert G., Geology, Western Washington University, 516 High Street, Bellingham, WA 98225-9080 and HIRSCH, David M., Geology, Western Washington University, 516 High Street, Bellingham, WA 98225, isaacson_robert@hotmail.com, isaacson_robert@hotmail.com
6
3:05 PM
ORIGIN OF CORONA TEXTURES IN DIKES NEAR THE MT. STUART BATHOLITH, NORTH CASCADES, WA, USA: X-RAY TOMOGRAPHY AND PSEUDOSECTION MODELING
STEIN, Ellen, Department of Geological Sciences, Univ of Alabama, Box 870338, Tuscaloosa, AL 35487-0338, STOWELL, Harold H., Dept. of Geological Sciences, Univ of Alabama, Tuscaloosa, AL 35487 and KETCHAM, Richard, Jackson School of Geosciences, University of Texas at Austin, 1 University Station, C-1100, Austin, TX 78712-0254, stein@maine.rr.com, stein@maine.rr.com
7
3:25 PM
INVERTED REGIONAL METAMORPHISM IN THE COAXIALLY REFOLDED TONGA FORMATION: EVIDENCE FOR MESOZOIC ACCRETIONAL TECTONICS IN THE CASCADES CRYSTALLINE CORE
JENSEN, Luke A.1, LEBIT, Hermann2, PATERSON, Scott1, MILLER, Robert3 and VERNON, Ron H.4, (1)Department of Earth Sciences, University of Southern California, Los Angeles, CA 90089-0740, (2)Department of Earth and Environmental Sciences, University of New Orleans, New Orleans, LA 50148, (3)Department of Geology, San Jose State Univ, San Jose, CA 95192-0102, (4)Department of Earth and Planetary Sciences, Macquarie University, Sydney, NSW 2109, Australia, hlebit@uno.edu, hlebit@uno.edu
8
3:45 PM
KINEMATIC ANALYSIS OF A CRETACEOUS THRUST ZONE, CASCADE CRYSTALLINE CORE, WASHINGTON
GRIESEL, Gerald and SCHERMER, Elizabeth, Geology, Western Washington University, MS9080 516 High St, Bellingham, WA 98225, gerry.griesel@gmail.com, gerry.griesel@gmail.com
9
4:05 PM
EVIDENCE FOR NORTHWEST-DIRECTED H2O-RICH SYNMETAMORPHIC FLUID FLOW, NW CASCADE CORE, WA
HENDERSON, Benjamin T., Geology, Western Washington University, 315 S. Lake St, POB 287, Reardan, WA 99029 and HIRSCH, David M., Geology, Western Washington University, 516 High Street, Bellingham, WA 98225, hirschd@cc.wwu.edu, hirschd@cc.wwu.edu
 
4:25 PM
Discussion: Loading of the Wenatchee Block - Data & Magma or Thrust Interpretations
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