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Originally published in Science Express on 22 April 2004
Science 21 May 2004:
Vol. 304. no. 5674, pp. 1126 - 1129
DOI: 10.1126/science.1096329
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Research Articles

Coeval Large-Scale Magmatism in the Kalahari and Laurentian Cratons During Rodinia Assembly

Richard E. Hanson,1* James L. Crowley,2 Samuel A. Bowring,2 Jahandar Ramezani,2 Wulf A. Gose,3 Ian W. D. Dalziel,3,4 James A. Pancake,5 Emily K. Seidel,1 Thomas G. Blenkinsop,6 Joshua Mukwakwami7

We show that intraplate magmatism occurred 1106 to 1112 million years ago over an area of two million square kilometers within the Kalahari craton of southern Africa, during the same magnetic polarity chron as voluminous magmatism within the cratonic core of North America. These contemporaneous magmatic events occurred while the Rodinia supercontinent was being assembled and are inferred to be parts of a single large igneous province emplaced across the two cratons. Widespread intraplate magmatism during Rodinia assembly shows that mantle upwellings required to generate such provinces may occur independently of the supercontinent cycle.

1 Department of Geology, Texas Christian University, Fort Worth, TX 76129, USA.
2 Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
3 Institute for Geophysics and Department of Geological Sciences, University of Texas, Austin, TX 78759, USA.
4 Tectonics Special Research Centre, School of Earth and Geographical Sciences, University of Western Australia, Crawley, WA 6009, Australia.
5 EG&G Technical Services, Inc., Morgantown, WV 26505, USA.
6 Department of Earth Science, James Cook University, Townsville, QLD4811, Australia.
7 Department of Geology, University of Zimbabwe, Post Office Box MP 167, Harare, Zimbabwe.

* To whom correspondence should be addressed. E-mail: r.hanson{at}tcu.edu

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Science. ISSN 0036-8075 (print), 1095-9203 (online)