Gondwana Six: Structure, Tectonics, and Geophysics by Garry D. McKenzie

By Garry D. McKenzie

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Published via the yankee Geophysical Union as a part of the Geophysical Monograph Series.

The Columbus symposium attracted one hundred fifty scientist from 19 nations to 5 days of technical periods, six box journeys, fee and dealing crew conferences, and workshops. themes lined within the technical periods have been more often than not just like these of prior conferences and incorporated reconstruction of Gondwanaland, vertebrate and invertebrate paleontology, biogeography, glacial geology, Gondwana stratigraphy, monetary geology, and tectonics and sedimentation at plate margins. A impressive distinction used to be in geographic insurance. As can be anticipated at a gathering co-hosted by way of the Institute of Polar reports and the dept of Geology and Minerology on the Ohio nation collage, the point of interest of the assembly used to be on Antarctica, with forty five% of the 102 papers protecting the Ross Sea region, West Antarctica, and northern Victoria Land.

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The composition of these deposits indicates that they were derived from quartz-rich continental rocks and their sedimentary cover. No significant volcanic rock fragments were noted. Even after considerable searching, no plutonic or volcanic blocks were found in the channel deposit, and thin sections of the fine-sand matrix and gray sandstone beds yielded low percentages of volcanic clasts. Thickness estimates for these units forming the Handler Formation are based on incomplete sections separated by either snow or rubble-covered areas Copyright American Geophysical Union Geophysical Monograph Series Gondwana Six: Structure, Tectonics, and Geophysics Vol.

43, 260-264, 1979. Smith, A. , and A. Hallam, The fit of the southern continents, Nature, 225, 139-144, 1970. Weissel, J. , D. E. Hayes, and E. M. Herron, Plate tectonics synthesis: The displacements between Australia, New Zealand, and Antarctica since the Late Cretaceous, Mar. , 25, 231-277, 1977. Copyright American Geophysical Union Geophysical Monograph Series Gondwana Six: Structure, Tectonics, and Geophysics Copyright 1987 by the American Geophysical Union. THE HANDLER FORMATION, A NEW UNIT OF THE ROBERTSON BAY GROUP, NORTHERN VICTORIA LAND, ANTARCTICA Thomas O.

Our revised reconstruction of Gondwana places constraints on the area in which the pieces of West Antarctica can be placed. The paleomagnetic results of Grunow et al. [this volume] indicate that there may be a major break between the peninsula and Marie Byrd Land, since our reconstruction indicates that Marie Byrd Land cannot have been rotated in the simple fashion that is suggested for the peninsula and the Ellsworth and Whitmore Mountains. Further work, particularly in the region between the Antarctic Peninsula and Marie Byrd Land, is needed.

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