Download Basement Tectonics 10: Proceedings of the Tenth by William J. Hinze, David J. Allen, Lawrence W. Braile, John PDF

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 collage 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 assorted international nations. The 4 days of displays have been divided into 3 technical classes, specifically "Shear Zones", "Basement keep an eye on On more youthful Structures", and "Rifting­ Midcontinent Rift System". This tripartite convention topic was once additionally hired within the box journey time table with 3 tours being provided, all ably equipped through box journey Chairman John C. eco-friendly. The pre-conference journey set the level via a day evaluate of the "Archean and Early Proterozoic Rocks of Northeastern Minnesota". less than attractive 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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Extra info for Basement Tectonics 10: Proceedings of the Tenth International Conference on Basement Tectonics, held in Duluth, Minnesota, U.S.A., August 1992

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The north flank of the Superior zone is composed of exposed basalts intruded by the world-class mafic Duluth Complex. Seismic stratigraphic and gravity studies suggest that up to 8 km of associated volcaniclastic sedimentary rocks subcrop beneath Lake Superior in a conformable relationship with older basalts (Cannon et a1. 1989). Interpretation of 6- to 20-second two-way-travel reflection profiles, collected in the mid-1980's both onshore and offshore Lake Superior (Chandler and et a1. 1989: Cannon et a1.

Final melting temperatures are all consistent with freezing point depression and salinity in the undersaturated NaCI - H2 0 system. 4 at Morley High Grade. 0%0. The partitioning between sphalerite and galena yields sulfur isotopic temperatures of 265°C (Dead horse Creek South), 275°C (Dead horse Creek North) and 537, 275 and 503°C (Morley High Grade). These compare with fluid inclusion homogenization temperatures in the sphalerite of 160°C (Dead horse Creek South), 175°C (Dead horse Creek North) and 355°C (Morley High Grade).

Magnetic modeling algorithms have been developed to take advantage of the magnetic data in an attempt to gain a more detailed perspective of the structural and stratigraphic aspects of the Keweenawan volcanic rocks associated with the MCR in eastern lake Superior. In addition, gravity data modeled in conjunction with seismic reflection and refraction constraints provide further information on the distribution of rift-filling sedimentary rocks as well as rift-related lower crustal modification. The intense gravity and magnetic signatures of the MCR are largely a result of the Keweenawan igneous and sedimentary rocks.

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