EarthRef.org Reference Database (ERR)
Development and Maintenance by the EarthRef.org Database Team

Detailed Reference Information
Hargraves & Onstott 1980
Hargraves, R.B. and Onstott, T.C. (1980). Paleomagnetic results from some southern African kimberlites, and their tectonic significance. Journal of Geophysical Research 85: doi: 10.1029/JB085iB07p03587. issn: 0148-0227.

Paleomagnetic data are reported from kimberlite occurrences of three distinct age groups: (1) National (one pipe), D=221 ¿, I=-51 ¿, k=41, α95=7.2 ¿, age ~1140 m.y., (2) Swartruggens (three fissures), mean D=293 ¿, I=-46 ¿, k=22, α95=26.9 ¿, age=~150 m.y., and (3) six bodies in and adjacent to Lesotho, D=350 ¿, I=-69 ¿, K=66, α95=8.3 ¿ with age spread of ~90+5 m.y. Analysis of these and previously published data suggest that most individual kimberlite bodies give acceptable paleomagnetic (as distinct form virtual geomagnetic) poles. This leads to a revised apparent polar wander curve for Africa in upper Mesozoic time and suggests that the time of kimberlite emplacement does coincide with intervals of rapid plate motion, although this cannot be the primary cause of their intrusion.

DATABASE QUICK LINKS

MagIC Database

BACKGROUND DATA FILES

Abstract

MagIC SmartBook v1

Journal
Journal of Geophysical Research
http://www.agu.org/journals/jb/
Publisher
American Geophysical Union
2000 Florida Avenue N.W.
Washington, D.C. 20009-1277
USA
1-202-462-6900
1-202-328-0566
service@agu.org
Click to clear formClick to return to previous pageClick to submit