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Rapid drift of large continents during the late Precambrian and Paleozoic: Paleomagnetic constraints and dynamic models

Gurnis, Michael and Torsvik, Trend H. (1994) Rapid drift of large continents during the late Precambrian and Paleozoic: Paleomagnetic constraints and dynamic models. Geology, 22 (11). pp. 1023-1026. ISSN 0091-7613. http://resolver.caltech.edu/CaltechAUTHORS:20130212-140824912

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Abstract

During the late Precambrian and early Paleozoic, Laurentia and Baltica moved at minimum drift rates of up to 23 cm/yr. These drift rates are computed from paleomagnetic apparent-polar-wander paths and represent minimum velocities, because there could have been significant undetected longitudinal motion. A pronounced burst in latitudinal velocity followed the breakup of the supercontinent Rodinia, which had been assembled for about 400-500 m.y. Finite-element models with tectonic plates show that the presence of deep continental roots can strongly influence the velocity of continents if the driving source of buoyancy is located in the lower mantle. When plates are driven by lithospheric cooling and subducted slabs, the presence of a root is less important. We argue that Laurentia and Baltica were either pushed off of a hot lower-mantle source or pulled toward cold lower-mantle anomalies and that the presence of continental roots enhanced this motion.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1130/0091-7613(1994)022%3C1023:RDOLCD%3E2.3.CO;2DOIUNSPECIFIED
http://geology.gsapubs.org/content/22/11/1023PublisherUNSPECIFIED
http://geology.geoscienceworld.org/content/22/11/1023PublisherUNSPECIFIED
Additional Information:© 1994 Geological Society of America. Manuscript received April 13, 1994. Revised manuscript received August 3, 1994. Manuscript accepted August 10, 1994. Supported by the David and Lucile Packard Foundation and National Science Foundation grant EAR 89-57164. Torsvik is supported by the Norwegian Research Council and the Geological Survey of Norway. California Institute of Technology, Division of Geological and Planetary Sciences, contribution 5401.
Group:Seismological Laboratory
Funders:
Funding AgencyGrant Number
David and Lucile Packard FoundationUNSPECIFIED
NSFEAR 89-57164
Norwegian Research Council UNSPECIFIED
Geological Survey of NorwayUNSPECIFIED
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Caltech Division of Geological and Planetary Sciences5401
Record Number:CaltechAUTHORS:20130212-140824912
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20130212-140824912
Official Citation: Michael Gurnis and Trond H. Torsvik Rapid drift of large continents during the late Precambrian and Paleozoic: Paleomagnetic constraints and dynamic models Geology, November, 1994, v. 22, p. 1023-1026, doi:10.1130/0091-7613(1994)022<1023:RDOLCD>2.3.CO;2
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:36883
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:27 Feb 2013 22:55
Last Modified:11 Jun 2015 12:59

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