Current and Recent Projects
Intrusive complex in the Göteborg region,
southwest Sweden.
Tim Brewer and Karl-Inge Åhäll (standing) for scale.
I am currently
engaged in collaborative field work in the following regions with the people and
institutions indicated:
Nagssugtoqidian and Rinkian orogens of West Greenland
International Research Co-operative effort headed by the Geological
Survey of Denmark and Greenland (GEUS)
- Jeroen van Gool,
Adam Garde, Kristine Thrane, Sandra Piazolo (GEUS)
The first phase of this project
(1995-1998) characterized the timing,
duration and nature of Archean and Paleoproterozoic magmatism, deformation and metamorphism
in the Nagssugtoqidian Orogen. The second phase, starting in the summer of 2001, will
work to link the Nagssugtoqidian Orogen with the lesser known Rinkian Orogen to
the north.
Sveconorwegian Orogen, southwestern Sweden
- Karl-Inge Åhäll, University of Göteborg, Göteborg, Sweden
- Tim Brewer, Leicester University
I am continuing to work with Åhäll and
Brewer on the growth and evolution of the Southwest Scandinavian Domain of southern Sweden,
including the characterization of Gothian and Sveconorwegian orogenesis and
intracontinental magmatism.
Nain Province, northern Labrador, Canada
- Bruce Ryan (Geological Survey Branch, Newfoundland Dept. of Mines and Energy -
GSB)
- Chris McFarlane (graduate student at UT Austin)
Three projects in one area here:
one paper chronicles the Late Archean history and possible final assembly of the
North Atlantic-Nain craton (Can. J. Earth Sciences, v. 33, p.1325) while a
second paper documents post-Archean magmatism that occurred intermittently over a protracted period
from 2.1 to 1.3 Ga, including the well-known Nain Plutonic Suite (Can.
J.
Earth Sciences v. 36, p. 833).
Chris is examining elemental and isotopic exchange, diffusion and equilibration
in pelitic and mafic systems in the aureole to the Nain Plutonic Suite.
Northern Chile and southern Peru
- Ian Dalziel, Staci Loewy (The University of Texas at Austin)
Isotopic and lithological
characterization of the Precordillera basement in northern Chile and southern Peru, with
particular interest in Grenville-aged rocks and events. This project
concentrates on testing tectonic reconstructions that place South America adjacent to NE
North America during the Meso- and Neoproterozoic.
Shackleton Range and Heimefrontfjella, Antarctica
- Ian Dalziel, Mark Helper (The University of Texas at Austin)
NSF funded project for the isotopic
characterization of the migmatitic and intrusive rocks of the Heimefrontfjella Range,
Antarctica, in order to test tectonic reconstructions that suggest East Antarctica was
adjacent to the south of North America during the Neoproterozoic. A paper is currently in
preparation for this project.