CONSTRAINTS ON THE MOTIONS OF SOUTH AMERICAN AND AFRICAN SHIELDS DURING THE PROTEROZOIC: I. 40Ar/39Ar AND PALEOMAGNETIC CORRELATIONS BETWEEN VENEZUELA AND LIBERIA.

Tullis C. Onstott; R. B. Hargraves; Derek York; Chris Hall

doi:10.1130/0016-7606(1984)95<1045:COTMOS>2.0.CO;2

CONSTRAINTS ON THE MOTIONS OF SOUTH AMERICAN AND AFRICAN SHIELDS DURING THE PROTEROZOIC: I. ⁴⁰Ar/³⁹Ar AND PALEOMAGNETIC CORRELATIONS BETWEEN VENEZUELA AND LIBERIA.

Tullis C. Onstott, R. B. Hargraves, Derek York, Chris Hall

Research output: Contribution to journal › Article › peer-review

61 Scopus citations

Abstract

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.

Original language	English (US)
Pages (from-to)	1045-1054
Number of pages	10
Journal	Bulletin of the Geological Society of America
Volume	95
Issue number	9
DOIs	https://doi.org/10.1130/0016-7606(1984)95<1045:COTMOS>2.0.CO;2
State	Published - Jan 1 1984

All Science Journal Classification (ASJC) codes

Geology

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10.1130/0016-7606(1984)95<1045:COTMOS>2.0.CO;2

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title = "CONSTRAINTS ON THE MOTIONS OF SOUTH AMERICAN AND AFRICAN SHIELDS DURING THE PROTEROZOIC: I. 40Ar/39Ar AND PALEOMAGNETIC CORRELATIONS BETWEEN VENEZUELA AND LIBERIA.",

abstract = "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.",

author = "Onstott, {Tullis C.} and Hargraves, {R. B.} and Derek York and Chris Hall",

year = "1984",

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doi = "10.1130/0016-7606(1984)95<1045:COTMOS>2.0.CO;2",

language = "English (US)",

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journal = "Bulletin of the Geological Society of America",

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CONSTRAINTS ON THE MOTIONS OF SOUTH AMERICAN AND AFRICAN SHIELDS DURING THE PROTEROZOIC: I. ⁴⁰Ar/³⁹Ar AND PALEOMAGNETIC CORRELATIONS BETWEEN VENEZUELA AND LIBERIA. / Onstott, Tullis C.; Hargraves, R. B.; York, Derek et al.
In: Bulletin of the Geological Society of America, Vol. 95, No. 9, 01.01.1984, p. 1045-1054.

Research output: Contribution to journal › Article › peer-review

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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.

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AU - York, Derek

AU - Hall, Chris

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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.

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CONSTRAINTS ON THE MOTIONS OF SOUTH AMERICAN AND AFRICAN SHIELDS DURING THE PROTEROZOIC: I. ⁴⁰Ar/³⁹Ar AND PALEOMAGNETIC CORRELATIONS BETWEEN VENEZUELA AND LIBERIA.

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