LITHOLOGICAL AND GEOCHEMICAL DISPERSAL IN TILL - MCADAM AREA, NEW-BRUNSWICK

Analyses of disperser patterns for till clasts and matrix geochemistry in the McAdam area, southwestern New Brunswick, are used to define th e dominant glacial transport direction in an area of ice-flow complexi ty, as indicated by multiple and differing striae directions. Dispersa l and erosional data indicate that the main (regional) southeastward f low direction was preceded and followed by secondary deviations, due t o local influences of topography and substrate and possibly also from changes within the ice mass or surrounding glaciers. Clast trains are traceable from known outcrops, southward over distances greater than 1 6 km, whereas distinctive geochemical trains are lost within IO km of transport, due to homogenization of the till matrix. These results dem onstrate that for drift prospecting, transport path and source unit ar e more clearly delineated by shape and size of till clasts and matrix dispersal patterns, than by analysis of directional indicators caused by glacial erosion.