By William J. Hinze, David J. Allen, Lawrence W. Braile, John Mariano (auth.), Richard W. Ojakangas, Albert B. Dickas, John C. Green (eds.)
The tenth foreign Basement Tectonics convention was once carried out at the campus of the college of Minnesota, Duluth, in Duluth, Minnesota, united states, from August I via August eleven, 1992. a complete of seventy eight members have been in attendance, forty seven of which represented the host nation, with the remainder 31 touring from eleven varied overseas international locations. The 4 days of shows have been divided into 3 technical classes, particularly "Shear Zones", "Basement regulate On more youthful Structures", and "Rifting Midcontinent Rift System". This tripartite convention topic used to be additionally hired within the box journey schedule with 3 tours being provided, all ably geared up through box journey Chairman John C. eco-friendly. The pre-conference journey set the degree via a day evaluation of the "Archean and Early Proterozoic Rocks of Northeastern Minnesota". lower than appealing summer season skies, sixteen websites have been visited in the Vermilion district of Minnesota, thought of to be the simplest instance of an Archean greenstone belt within the usa. All registrants participated within the mid-conference journey performed alongside the gabbroic and volcanic terrain of the "Midcontinent Rift, Northeastern Minnesota".
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Additional info for Basement Tectonics 10: Proceedings of the Tenth International Conference on Basement Tectonics, held in Duluth, Minnesota, U.S.A., August 1992
S-rift sediments: V-rift volcanic rocks; I-rift intrusions; B-basement of Archean and Early Proterozoic rocks: M-Moho. Lowercase letters identify features discussed in the text. Form lines are strong seismic reflectors from GLlMPCE line C in Lake Superior (Cannon et al. 1989) recorded to 20s two-way travel time, and Geosource line south of Lake Superior (Hinze et al. 1990) processed to 5s. Depth of reflectors is calculated for average velocity of 6 km/s. No vertical exaggeration. I) c 10 w. F. CANNON probably as a result of rift-flank uplift.
A. JOHN C. A. E. A. 1 Ga Midcontinent Rift System reveal that the greatest thicknesses (15-22 kIn) of Keweenawan lavas are contained within asymmetric grabens bounded by what are now listric reverse faults, but which must have acted as normal growth faults during much of the volcanism (Chandler et al. 1989; Cannon et al. 1989; Cannon 1992; Thomas and Teskey 1994). This is particularly true of the Portage Lake Volcanics (PLV) and their equivalents which form the upper part of the Keweenawan volcanic sequence in the Lake Superior region.
The Superior zone is bounded by the Belle Plaine (southern Minnesota) and the Thiel (east-central Lake Superior Basin) regional (1st order) accommodation structures (A. ) and is sub-divided into four rift units by local (2nd order) accommodation structures. Note that each of the rift units possesses a sediment-thickening direction that is opposite to that of adjacent rift units (see black arrows). The barbed border of each rift unit represents the location of Keweenawan fault detachments bounding the thick wedges of volcanic and associated sedimentary rocks.
Basement Tectonics 10: Proceedings of the Tenth International Conference on Basement Tectonics, held in Duluth, Minnesota, U.S.A., August 1992 by William J. Hinze, David J. Allen, Lawrence W. Braile, John Mariano (auth.), Richard W. Ojakangas, Albert B. Dickas, John C. Green (eds.)