Rb-Sr isotope constraints on the timing of late to post-Archaean tectonometamorphism affecting the southeastern Kaapvaal Craton

T. Elworthy; B. M. Eglington; R. A. Armstrong; A. B. Moyes

doi:10.1016/S0899-5362(00)00043-9

Rb-Sr isotope constraints on the timing of late to post-Archaean tectonometamorphism affecting the southeastern Kaapvaal Craton

T. Elworthy, B. M. Eglington^*, R. A. Armstrong, A. B. Moyes

^*Corresponding author for this work

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

19 Citations (Scopus)

Abstract

Biotite separates from Archaean granitoid lithologies on the Kaapvaal Craton north of the Proterozoic Namaqua-Natal Belt in south eastern South Africa exhibit Rb-Sr model dates of 967 ± 24 Ma for samples from within 25 km of the present northern limit of the Proterozoic thrust front. Samples from further north (>50 km to 170 km) have model Rb-Sr dates of 2614 ± 74 Ma. The younger dates are interpreted as dating cooling after northwards emplacement of Proterozoic crust onto the Kaapvaal Craton, whereas the older dates are presumed to relate to an Archaean metamorphic episode, possibly associated with intrusion of the post-Pongola granites. (C) 2000 Elsevier Science Limited. All rights reserved.

Original language	English
Pages (from-to)	641-650
Number of pages	10
Journal	Journal of African Earth Sciences
Volume	30
Issue number	3
DOIs	https://doi.org/10.1016/S0899-5362(00)00043-9
Publication status	Published - Jun 2000

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title = "Rb-Sr isotope constraints on the timing of late to post-Archaean tectonometamorphism affecting the southeastern Kaapvaal Craton",

abstract = "Biotite separates from Archaean granitoid lithologies on the Kaapvaal Craton north of the Proterozoic Namaqua-Natal Belt in south eastern South Africa exhibit Rb-Sr model dates of 967 ± 24 Ma for samples from within 25 km of the present northern limit of the Proterozoic thrust front. Samples from further north (>50 km to 170 km) have model Rb-Sr dates of 2614 ± 74 Ma. The younger dates are interpreted as dating cooling after northwards emplacement of Proterozoic crust onto the Kaapvaal Craton, whereas the older dates are presumed to relate to an Archaean metamorphic episode, possibly associated with intrusion of the post-Pongola granites. (C) 2000 Elsevier Science Limited. All rights reserved.",

author = "T. Elworthy and Eglington, {B. M.} and Armstrong, {R. A.} and Moyes, {A. B.}",

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T1 - Rb-Sr isotope constraints on the timing of late to post-Archaean tectonometamorphism affecting the southeastern Kaapvaal Craton

AU - Elworthy, T.

AU - Eglington, B. M.

AU - Armstrong, R. A.

AU - Moyes, A. B.

PY - 2000/6

Y1 - 2000/6

N2 - Biotite separates from Archaean granitoid lithologies on the Kaapvaal Craton north of the Proterozoic Namaqua-Natal Belt in south eastern South Africa exhibit Rb-Sr model dates of 967 ± 24 Ma for samples from within 25 km of the present northern limit of the Proterozoic thrust front. Samples from further north (>50 km to 170 km) have model Rb-Sr dates of 2614 ± 74 Ma. The younger dates are interpreted as dating cooling after northwards emplacement of Proterozoic crust onto the Kaapvaal Craton, whereas the older dates are presumed to relate to an Archaean metamorphic episode, possibly associated with intrusion of the post-Pongola granites. (C) 2000 Elsevier Science Limited. All rights reserved.

AB - Biotite separates from Archaean granitoid lithologies on the Kaapvaal Craton north of the Proterozoic Namaqua-Natal Belt in south eastern South Africa exhibit Rb-Sr model dates of 967 ± 24 Ma for samples from within 25 km of the present northern limit of the Proterozoic thrust front. Samples from further north (>50 km to 170 km) have model Rb-Sr dates of 2614 ± 74 Ma. The younger dates are interpreted as dating cooling after northwards emplacement of Proterozoic crust onto the Kaapvaal Craton, whereas the older dates are presumed to relate to an Archaean metamorphic episode, possibly associated with intrusion of the post-Pongola granites. (C) 2000 Elsevier Science Limited. All rights reserved.

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DO - 10.1016/S0899-5362(00)00043-9

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SN - 1464-343X

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JO - Journal of African Earth Sciences

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Rb-Sr isotope constraints on the timing of late to post-Archaean tectonometamorphism affecting the southeastern Kaapvaal Craton

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