Structure of a Paleoproterozoic continent-continent collision zone: a LITHOPROBE seismic reflection profile across the Trans-Hudson Orogen, Canada

Electrical-resistivity imaging of the central Trans-Hudson orogen

“…Seismic reflection profiles from the Lithoprobe transect have shown that the internal zone of the THO has been subjected to thick-skinned style deformation with significant dipping reflective zones extending from the surface to Moho depths White et al 1994;Lewry et al 1994). To the west of the Glennie domain, the response is characterized by west-dipping packages of reflectors extending through the crust and within the Glennie domain, and further east, the response is characterized by east-dipping packages (Fig.…”

“…The eastern La Ronge domain is dominated by high-grade metasedimentary migmatites . The western La Ronge domain consists mainly of low metamorphic grade mafic to felsic metavolcanic rocks and Major geological structures in the study area (after Lewry et al 1994;Hajnal et al 1996). SWSZ, Sturgeon-Weir shear zone; HSZ, Hartley shear zone; SF, Stanley fault; GCT, Guncoat thrust; BRSZ, Birch Rapid "straight belt"; TF, Tabbernor fault; SW, Sahli window; MW, MacMillan Point window; HW, Hunter Bay window; NW, Nistowiak-Iskwatikan window.…”

“…(a) Western part of study area (seismic data from Hajnal et al 1996). Four interpreted locations of the Guncoat thrust are shown: 1, from Hajnal et al (2004); 2, from Lewry et al (1994); 3, from Baird and Clowes (1996); 4, from . PC1 and PC2, upper and lower limits of a distinct band of reflectivity interpreted to correspond to the upper surface of the Sask craton; R, crustal root; UF, unnamed fault; M, Moho; CLC, conducting lower crust; (b) Eastern part of study area (seismic data from Pandit et al 1998).…”

Logan Medallist 2. Geophysics and Geology: An Essential Combination Illustrated by LITHOPROBE Interpretations–Part 1, Lithospheric Examples

“…1), partly because the Reindeer zone included four small tectonic windows of Archean rocks . However, a high quality reflection line across the entire orogen, supplemented by the observed and inferred geological features to which reflections could be related, demonstrated that both the Superior and Hearne cratons were structurally isolated from the Reindeer zone and led to the discovery of a new microcontinent called the Sask craton (Lucas et al 1993Lewry et al 1994;Ansdell et al 1995).…”

Structural relations between the polydeformed Flin Flon arc assemblage and Missi Group sedimentary rocks, Flin Flon area, Manitoba and Saskatchewan

“…Seismic transects conducted by LITEOPROBE provide a three-dimensional insight into the nature of the boundaries between the Sask craton basement, the Kisseynew Domain and the Flin Flon Belt, as well as on the major structures that 15 dissect these three areas internally (Lucas et al, 1993aLewry et al, 1994;White et al, 1994). Profiies across the eastern segment of the Reindeer Zone show continuous north-to eastdipping refiectors which extend to the base of the cmst (Lucas et ai., 1993a;White et al, 1994).…”