TY - JOUR
T1 - CONSTRAINTS ON THE MOTIONS OF SOUTH AMERICAN AND AFRICAN SHIELDS DURING THE PROTEROZOIC
T2 - I. 40Ar/39Ar AND PALEOMAGNETIC CORRELATIONS BETWEEN VENEZUELA AND LIBERIA.
AU - Onstott, Tullis C.
AU - Hargraves, R. B.
AU - York, Derek
AU - Hall, Chris
PY - 1984/1/1
Y1 - 1984/1/1
N2 - The Encrucijada pluton of Venezuela and amphibolites near Harper, Liberia, are located on opposite sides of the Liberian Pan-African mobile belt, when South America is restored in a fit described in the literature with respect to Africa. Both units yield stable, bipolar, high-temperature magnetizations that appear to be indistinguishable in age at 1. 9 to 2. 0 Ga. With South America in this reconstruction, the corresponding paleomagnetic poles suggest that 1000 km of right-lateral strike-slip motion has occured between the West African and Guayana Shields. The Encrucijada and Harper poles are distinct from the 1. 9- to 2. 0-Ga paleomagnetic poles from the Kalahari Shield and suggest that relative motion has occurred between the Kalahari Shield and the West African and Guayana Shields since that time. Refs.
AB - The Encrucijada pluton of Venezuela and amphibolites near Harper, Liberia, are located on opposite sides of the Liberian Pan-African mobile belt, when South America is restored in a fit described in the literature with respect to Africa. Both units yield stable, bipolar, high-temperature magnetizations that appear to be indistinguishable in age at 1. 9 to 2. 0 Ga. With South America in this reconstruction, the corresponding paleomagnetic poles suggest that 1000 km of right-lateral strike-slip motion has occured between the West African and Guayana Shields. The Encrucijada and Harper poles are distinct from the 1. 9- to 2. 0-Ga paleomagnetic poles from the Kalahari Shield and suggest that relative motion has occurred between the Kalahari Shield and the West African and Guayana Shields since that time. Refs.
UR - http://www.scopus.com/inward/record.url?scp=0021642622&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0021642622&partnerID=8YFLogxK
U2 - 10.1130/0016-7606(1984)95<1045:COTMOS>2.0.CO;2
DO - 10.1130/0016-7606(1984)95<1045:COTMOS>2.0.CO;2
M3 - Article
SN - 0016-7606
VL - 95
SP - 1045
EP - 1054
JO - Bulletin of the Geological Society of America
JF - Bulletin of the Geological Society of America
IS - 9
ER -