AN: T71E-06TI: Correlation of Deep Crustal Reflectors of the ACCRETE Seismic Section    With Surface Exposures of Rocks Formed in the Lower    CrustAU: Lincoln S. HollisterAF: Dept.of Geosciences Princeton University Princeton New Jersey     08544-1003 USAEM: linc@geo.princeton.eduAU: Chris AndronicosAF: Dept.of Geosciences Princeton University Princeton New Jersey     08544-1003 USAEM: cla@princeton.eduAU: John DieboldAF: Lamont-Doherty Columbia University Rt. 9W P.O. Box 1000 Palisades New    York 10964EM: johnd@lamont.ldgo.columbia.eduAB:     The goal of the ACCRETE project is to define the history    of terrane accretion and continental crust evolution    between latitudes $53\deg$N and $57\deg$N, across the Coast    Mountains of British Columbia and southeast Alaska. In    order to help obtain a 3-D image of the major geologic    features, a vertical seismic section was made along a fiord    that crosses the north-northwest trending Coast    Mountains. An important step in interpreting this seismic    section is to correlate mid to lower crustal seismic    features observed in the seismic section to rocks presently    exposed on the surface. This can be done because the    mid to lower crustal rocks exposed on the surface project    from south of the seismic transect into the vertical plane    of the seismic section.        Preliminary observations show that the Shames mylonite    zone, an over 4 km thick extensional detachment fault    mapped along the east side of the Coast Mountains,    reaches the plane of the seismic section and can be    traced along the seismic section to the northeast    where it underlies a belt of "post tectonic" plutons    intruded into the Stikine terrane; the detachment zone    appears to cut the Moho. To the west, the detachment    zone has an apparent easterly dip and appears to cut, at a    low angle, a zone of subhorizontal lower crustal    reflectors. This zone of reflectors is in the region of the    seismic section where an over 10 km thick high    temperature (melt-present) top to the south thrust zone    projects down the direction of thrusting to the vertical    plane of the seismic section. Finally, further to the west,    in a zone mapped along the eastern side of the Coast    shear, the planar fabric produced by the thrusting has    been folded around north plunging hinge lines. In the    plane of the seismic section to which these hinges project,    there are no major reflecting horizons above the Moho    zone of reflectors; this would be expected if the folding    were on a crustal scale.        SC: TDE: 7245DE: 8110DE: 8115MN: Fall Meeting 1996