Session: Tectonics (Posters) (Northeastern Section (39th Annual) and Southeastern Section (53rd Annual) Joint Meeting (March 25

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1

45

UPLIFT AND EXHUMATION OF THE CORDILLERA HUAYHUASH, NORTHERN PERU, BASED ON U+TH/HE AND FISSION-TRACK DATING OF ZIRCON

WALKER, Lydia J., Geology Department, Union College, 807 Union AVE, Schenectady, NY 12308 and GARVER, John I., Geology Department, Union College, Union College, Olin Building, Schenectady, NY 12308-2311, walkerl@union.edu, walkerl@union.edu

2

46

U-PB ZIRCON AGES FROM THE INNER PIEDMONT TERRANE: IMPLICATIONS FOR A LAURENTIAN ORIGIN

HEATHERINGTON, Ann L., Department of Geological Sciences, Univ of Florida, Box 112120, 241 Williamson Hall, Gainesville, FL 32611 and MUELLER, Paul A., Geological Sciences, Univ of Florida, Gainesville, FL 32611, mueller@geology.ufl.edu, mueller@geology.ufl.edu

3

47

THE MAGMATIC RECORD OF THE TACONIC OROGENIC CYCLE: EVIDENCE FROM ION PROBE U/PB AGES OF ZIRCONS FROM THE CENTRAL APPALACHIAN OROGEN

SINHA, A.K., Department of Geosciences, Virginia Tech, Blacksburg, VA 24061, pitlab@vt.edu, pitlab@vt.edu

4

48

LATE MESOZOIC EXHUMATION OF THE NORTHERN APPALACHIAN OROGEN: INFORMATION FROM APATITE FISSION TRACK AGES

RODEN-TICE, Mary K.¹, WEST Jr, David P.², WINTSCH, Robert P.³, POTTER, Jaime K.¹ and WINCH, Jenny L.¹, (1)Center for Earth and Environmental Science, Plattsburgh State Univ, 101 Broad St, Plattsburgh, NY 12901, (2)Department of Geology, Middlebury College, Middlebury, VT 05753, (3)Department of Geological Sciences, Indiana Univ, 1001 East 10th Street, Bloomington, IN 47405, mary.rodentice@plattsburgh.edu, mary.rodentice@plattsburgh.edu

5

49

ALLEGHANIAN OVERPRINT IN THE MERRIMACK TERRANE, EASTERN MASSACHUSETTS: TEXTURAL, MINERALOGICAL, AND ⁴⁰AR/³⁹AR ISOTOPIC EVIDENCE

ATTENOUKON, M.B., Department of Geological Sciences, Indiana Univ, Bloomington, IN 47405, KUNK, M.J., U. S. Geol Survey, MS 963, Denver Federal Center, Denver, CO 80225 and WINTSCH, R.P., Department of Geology, Indiana Univ, Bloomington, IN 47405, miatteno@indiana.edu, miatteno@indiana.edu

6

50

DEPOSITIONAL RESPONSE OF ORDOVICIAN FORELAND BASIN TURBIDITES TO BATHYMETRY IN THE FRONTAL THRUST OF THE TACONIC THRUST WEDGE

POWERS, Larissa N., Geology Department, Union College, Union College, Olin Building, Schenectady, NY 12308 and GARVER, John I., Geology Department, Union College, Union College, Olin Building, Schenectady, NY 12308-2311, powersl@union.edu, powersl@union.edu

7

51

EXTENSIONAL TECTONICS IN COLLISIONAL OROGENS: A CASE STUDY OF EARLY SILURIAN EXTENSION IN THE CENTRAL APPALACHIANS ASSOCIATED WITH THE TACONIC OROGENY

TRUJILLO, Jon and SINHA, A.K., Department of Geosciences, Virginia Tech, Blacksburg, VA 24061, jtrujillo@vt.edu, jtrujillo@vt.edu

8

52

TEMPORAL AND SPATIAL DISTRIBUTION OF CRYOGENIAN AGE IGNEOUS ROCKS IN THE CENTRAL APPALACHIAN OROGEN: A SINGLE HOT SPOT INDUCED MAGMATISM?

FOKIN, Maria, Advanced Resources International Inc, 4501 Fairfax Drive, Arlington, VA 22203 and SINHA, A.K., Department of Geosciences, Virginia Tech, Blacksburg, VA 24061, mfokin@adv-res.com, mfokin@adv-res.com

9

53

THE NATURE OF THE SETTERS FORMATION IN THE PENNSYLVANIA PIEDMONT

BLACKMER, Gale C., Bureau of Topographic and Geologic Survey, 3240 Schoolhouse Rd, Middletown, PA 17057 and SROGI, LeeAnn, Department of Geology/Astronomy, West Chester Univ, 720 S Church St, West Chester, PA 19383-0001, gblackmer@state.pa.us, gblackmer@state.pa.us

10

54

FELSIC MAGMATISM IN FLOOD BASALT PROVINCES: A STUDY OF THE SOUTH MOUNTAIN (CATOCTIN) HIGH SILICA RHYOLITES

MITRA, Arijit and SINHA, A.K., Department of Geosciences, Virginia Tech, Blacksburg, VA 24061, amitra@vt.edu, amitra@vt.edu

11

55

⁴⁰AR/³⁹AR CONSTRAINTS ON THE AGE OF FABRIC DEVELOPMENT IN THE WESTMINSTER TERRANE, NORTH-CENTRAL MARYLAND

MULVEY, B.K.¹, KUNK, M.J.², SOUTHWORTH, C.S.³ and WINTSCH, R.P.¹, (1)Department of Geology, Indiana Univ, Bloomington, IN 47405, (2)U. S. Geol Survey, MS 963, Denver Federal Center, Denver, CO 80225, (3)U.S. Geol Survey, MS 926-A National Center, Reston, VA 20192, bmulvey@indiana.edu, bmulvey@indiana.edu

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56

CONSTRAINTS IN THE THERMAL HISTORY OF THE POTOMAC AND WESTMINSTER TERRANES IN MARYLAND, VIRGINIA, AND WASHINGTON D.C.: EXTRACTION OF USEFUL AGES FROM COMPLEX ⁴⁰AR/³⁹AR AGE SPECTRA

KUNK, M.J.¹, WINTSCH, R.P.², SOUTHWORTH, C.S.³, MULVEY, B.K.², NAESER, C.W.³ and NAESER, N.D.³, (1)U. S. Geol Survey, MS 963, Denver Federal Center, Denver, CO 80225, (2)Department of Geology, Indiana Univ, Bloomington, IN 47405, (3)U.S. Geol Survey, MS 926-A National Center, Reston, VA 20192, mkunk@usgs.gov, mkunk@usgs.gov

Northeastern Section (39th Annual) and Southeastern Section (53rd Annual) Joint Meeting (March 25–27, 2004)

Tectonics (Posters)