February media highlights - GS...( Boulder Colo. - The February issue of ...)

Boulder, Colo. - The February issue of the GEOLOGICAL SOCIETY OF AMERICA BULLETIN includes a number of newsworthy items. Please discuss articles of interest with the authors before publishing stories on their work, and please make reference to the GSA BULLETIN in stories published. Contact Ann Cairns for copies of articles and for additional information or assistance.

Permian sedimentary record of the Turpan-Hami basin and adjacent regions, northwest China: Constraints on postamalgamation tectonic evolution.
Marwan A. Wartes, et al. Department of Geology and Geophysics, University of Wisconsin, Madison, Wisconsin 53706, USA. Pages 131-152.
The remote interior of Asia remains one of the least understood geologic provinces on Earth. Our expeditions have documented the geologic history of northwest China during the Permian period, a time immediately following an episode of plate collisions and mountain building during the coalescence of the supercontinent Pangea. One of the more intriguing discoveries of our work was the existence of a vast lake, or lakes, which covered at least 300,000 square km, roughly equivalent to the largest modern lake on the planet (Caspian Sea).

Paleoproterozoic arc magmatism imposed on an older backarc basin: Implications for the tectonic evolution of the Trans-Hudson orogen, Canada.
Pete Hollings and Kevin Ansdell, Department of Geological Sciences, University of Saskatchewan, Saskatoon, Saskatchewan S7N 5E2, Canada. Pages 153-168.
This article reports new geochemical data from circa 1.83 billion year old granitic rocks that were intruded into sedimentary rocks and were themselves affected by metamorphism. This data suggests that the granitoids formed above a subduction zone in a continental arc environment, similar to the present-day Andes in South America, just prior to the collision with a continent called the Sask Craton. This collision ultimately led to the formation of Himalayan-type mountain be
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Contact: Ann Cairns
acairns@geosociety.org
303-357-1056
Geological Society of America
8-Feb-2002

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