Rb-Sr ages of metamorphic rocks in the Rhenosterkoppies Greenstone Belt, northern Kaapvaal Craton, South Africa

Y. Arakawa; T. Miyano; D. D. Van Reenen

Rb-Sr ages of metamorphic rocks in the Rhenosterkoppies Greenstone Belt, northern Kaapvaal Craton, South Africa

Y. Arakawa, T. Miyano, D. D. Van Reenen

Geology

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

4 Citations (Scopus)

Abstract

Rb-Sr ages were determined for metamorphic rocks in the Rhenosterkoppies greenstone belt. Two quartzose (pegmatitic) metamorphic rocks yielded Rb-Sr muscovite ages of 2749 Ma and 2657 Ma. These ages almost agree with previously reported muscovite ages of metamorphic rocks, granitic plutons and pegmatites associated with shear zones. A Rb-Sr whole rock isochron age of 3187 ± 104 Ma with an initial ⁸⁷Sr/⁸⁶Sr ratio of 0.70089 ± 0.00017 was obtained from five mafic metamorphic rocks (metabasalts). This age probably represents the protolith age of the mafic rocks and is considerably younger than the ages of mafic rocks (3450-3550 Ma) in the well studied Barbarton greenstone belt and the Pietersburg greenstone belt. -from Authors

Original language	English
Pages (from-to)	67-72
Number of pages	6
Journal	Annual Report - University of Tsukuba, Institute of Geoscience
Volume	18
Publication status	Published - 1992

ASJC Scopus subject areas

General Environmental Science
General Earth and Planetary Sciences

Cite this

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title = "Rb-Sr ages of metamorphic rocks in the Rhenosterkoppies Greenstone Belt, northern Kaapvaal Craton, South Africa",

abstract = "Rb-Sr ages were determined for metamorphic rocks in the Rhenosterkoppies greenstone belt. Two quartzose (pegmatitic) metamorphic rocks yielded Rb-Sr muscovite ages of 2749 Ma and 2657 Ma. These ages almost agree with previously reported muscovite ages of metamorphic rocks, granitic plutons and pegmatites associated with shear zones. A Rb-Sr whole rock isochron age of 3187 ± 104 Ma with an initial 87Sr/86Sr ratio of 0.70089 ± 0.00017 was obtained from five mafic metamorphic rocks (metabasalts). This age probably represents the protolith age of the mafic rocks and is considerably younger than the ages of mafic rocks (3450-3550 Ma) in the well studied Barbarton greenstone belt and the Pietersburg greenstone belt. -from Authors",

author = "Y. Arakawa and T. Miyano and {Van Reenen}, {D. D.}",

year = "1992",

language = "English",

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pages = "67--72",

journal = "Annual Report - University of Tsukuba, Institute of Geoscience",

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TY - JOUR

T1 - Rb-Sr ages of metamorphic rocks in the Rhenosterkoppies Greenstone Belt, northern Kaapvaal Craton, South Africa

AU - Arakawa, Y.

AU - Miyano, T.

AU - Van Reenen, D. D.

PY - 1992

Y1 - 1992

N2 - Rb-Sr ages were determined for metamorphic rocks in the Rhenosterkoppies greenstone belt. Two quartzose (pegmatitic) metamorphic rocks yielded Rb-Sr muscovite ages of 2749 Ma and 2657 Ma. These ages almost agree with previously reported muscovite ages of metamorphic rocks, granitic plutons and pegmatites associated with shear zones. A Rb-Sr whole rock isochron age of 3187 ± 104 Ma with an initial 87Sr/86Sr ratio of 0.70089 ± 0.00017 was obtained from five mafic metamorphic rocks (metabasalts). This age probably represents the protolith age of the mafic rocks and is considerably younger than the ages of mafic rocks (3450-3550 Ma) in the well studied Barbarton greenstone belt and the Pietersburg greenstone belt. -from Authors

AB - Rb-Sr ages were determined for metamorphic rocks in the Rhenosterkoppies greenstone belt. Two quartzose (pegmatitic) metamorphic rocks yielded Rb-Sr muscovite ages of 2749 Ma and 2657 Ma. These ages almost agree with previously reported muscovite ages of metamorphic rocks, granitic plutons and pegmatites associated with shear zones. A Rb-Sr whole rock isochron age of 3187 ± 104 Ma with an initial 87Sr/86Sr ratio of 0.70089 ± 0.00017 was obtained from five mafic metamorphic rocks (metabasalts). This age probably represents the protolith age of the mafic rocks and is considerably younger than the ages of mafic rocks (3450-3550 Ma) in the well studied Barbarton greenstone belt and the Pietersburg greenstone belt. -from Authors

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M3 - Article

AN - SCOPUS:0027042043

VL - 18

SP - 67

EP - 72

JO - Annual Report - University of Tsukuba, Institute of Geoscience

JF - Annual Report - University of Tsukuba, Institute of Geoscience

ER -

Rb-Sr ages of metamorphic rocks in the Rhenosterkoppies Greenstone Belt, northern Kaapvaal Craton, South Africa

Abstract

ASJC Scopus subject areas

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