The 12thInternational BasementTectonicsConferencewas hostedbythe
Schoolof Geologyand Geophysics and theOklahoma Geological Survey
inthe SarkeysEnergy Centeronthe campusoftheUniversityofOklahoma,
Norman, Oklahoma, U. S. A. , from May 21stthroughMay 26th, 1995.
Atotal of52 individualswere in attendance, 9
ofwhichwereattendingfrom 6differentforeign countries.
Fourdaysoforal and posterpresentationswere divided intofour
technical sessions withthefollowing themes: I)FractureDevelopment,
Reactivation, andMineralization, organizedbyM. 1. Bartholomewand S.
Marshak; 2)EvolutionoftheBasementofthe North American Plate (with
special emphasison its southern margin), organizedby R E.
Denisonand E. G. Lidiak; 3)ProbingofBasement: Geophysical and
Geochemical Methods,organizedbyR A. Youngand G. R Keller; and
4)ResponseofCoverRocks toBasementDeformation, organized by P.
Berendsenand M. P. Carlson. Seventy-five presentationswere made
during thecourseofthe meeting, which wasorganizedby Program
Chairman M. Charles Gilbertandprofessionally managedbySaraMoody.
Precedingthe meeting wasatwo dayfield trip toexaminethe modeand
kinematics ofterraneaccretion duringclosureofan oceanbasin, as
preserved in thePrecambrian geologyoftheeasternLlano Uplift, Texas,
U. S. A. Thefield trip leaders Sharon Mosher, MarkHelper, Don
Barker, and Robert Reed providedan excellentand comprehensive
guidebook, and shared theirconsiderable expertise in
manydiscussions at one spectacularexposures afteranother. All
registrants participatedinthe mid-conferencefield tripguidedby R E.
Denison, E. G. Lidiak, M. C. Gilbert, and John P. Hogan to
examinethePrecambrianand Cambrianbasementterranesexposed in the
ArbuckleMountainsupliftin southernOklahoma, U. S. A. Evidencefor
apossible continental arc settingfor the southern margin ofthe-1. 4
Ga Granite-Rhyolite Terrane, theopeningofthe Cambrian Southern
Oklahoma Aulacogenasevidencedby aspectacularexposureofadiabasedike
swarm, and the roleofearliertectonicfabrics in
thedevelopmentofyoungerstructureswere someofthe topicsofdiscussion.
Thetwo day postconferencefield trip to the WichitaMountains uplift,
southwestern Oklahoma, U. S. A. was ledby M. Charles Gilbert, and
John P. Hogan. Thistrip highlightedthe Cambrian SouthernOklahoma
Aulacogen.
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