Hf isotopic evidence for a cogenetic magma source for the Bushveld Complex and associated felsic magmas

J. A. VanTongeren; N. A. Zirakparvar; E. A. Mathez

doi:10.1016/j.lithos.2016.02.007

Hf isotopic evidence for a cogenetic magma source for the Bushveld Complex and associated felsic magmas

J. A. VanTongeren, N. A. Zirakparvar, E. A. Mathez

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

28 Scopus citations

Abstract

Here, we test the hypothesis that the rhyolitic lavas of the Rooiberg Group and granophyres associated with the roof of the Bushveld Complex are differentiation products of Bushveld-age mafic liquids. We present Lu-Hf isotopic compositions in zircons from roof rocks that have been interpreted to represent thermally metamorphosed and remelted Rooiberg Group lavas and from granophyres interpreted to be differentiation products of the cumulate rocks that make up the Bushveld Complex. All of these rocks were found to possess εHf _{(2.06 Ga)} statistically indistinguishable from the intrusion-wide average εHf _{(2.06 Ga) value} of -8.6 ± 1.2 of the Bushveld Complex. Our results, combined with chronologic and field relations, suggest that the felsic rocks were generated by fractional crystallization of Bushveld mafic liquids, including those that gave rise to the cumulate rocks of the Bushveld Complex.

Original language	English
Pages (from-to)	469-477
Number of pages	9
Journal	Lithos
Volume	248-251
DOIs	https://doi.org/10.1016/j.lithos.2016.02.007
State	Published - Apr 1 2016
Externally published	Yes

Funding

This work was supported by NSF-EAR 0947247 awarded to E.A. Mathez and institutional funding from the American Museum of Natural History to Alex Zirakparvar. We thank Louise Bolge of the LDEO ICP-MS facility for her analytical expertise.

Funders	Funder number
NSF-EAR	0947247
American Museum of Natural History

Keywords

Bushveld Complex
Hf isotopes
Rooiberg Group
Rustenburg Layered Suite
Stavoren Granophyre

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10.1016/j.lithos.2016.02.007

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title = "Hf isotopic evidence for a cogenetic magma source for the Bushveld Complex and associated felsic magmas",

abstract = "Here, we test the hypothesis that the rhyolitic lavas of the Rooiberg Group and granophyres associated with the roof of the Bushveld Complex are differentiation products of Bushveld-age mafic liquids. We present Lu-Hf isotopic compositions in zircons from roof rocks that have been interpreted to represent thermally metamorphosed and remelted Rooiberg Group lavas and from granophyres interpreted to be differentiation products of the cumulate rocks that make up the Bushveld Complex. All of these rocks were found to possess εHf (2.06 Ga) statistically indistinguishable from the intrusion-wide average εHf (2.06 Ga) value of -8.6 ± 1.2 of the Bushveld Complex. Our results, combined with chronologic and field relations, suggest that the felsic rocks were generated by fractional crystallization of Bushveld mafic liquids, including those that gave rise to the cumulate rocks of the Bushveld Complex.",

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AU - VanTongeren, J. A.

AU - Zirakparvar, N. A.

AU - Mathez, E. A.

PY - 2016/4/1

Y1 - 2016/4/1

N2 - Here, we test the hypothesis that the rhyolitic lavas of the Rooiberg Group and granophyres associated with the roof of the Bushveld Complex are differentiation products of Bushveld-age mafic liquids. We present Lu-Hf isotopic compositions in zircons from roof rocks that have been interpreted to represent thermally metamorphosed and remelted Rooiberg Group lavas and from granophyres interpreted to be differentiation products of the cumulate rocks that make up the Bushveld Complex. All of these rocks were found to possess εHf (2.06 Ga) statistically indistinguishable from the intrusion-wide average εHf (2.06 Ga) value of -8.6 ± 1.2 of the Bushveld Complex. Our results, combined with chronologic and field relations, suggest that the felsic rocks were generated by fractional crystallization of Bushveld mafic liquids, including those that gave rise to the cumulate rocks of the Bushveld Complex.

AB - Here, we test the hypothesis that the rhyolitic lavas of the Rooiberg Group and granophyres associated with the roof of the Bushveld Complex are differentiation products of Bushveld-age mafic liquids. We present Lu-Hf isotopic compositions in zircons from roof rocks that have been interpreted to represent thermally metamorphosed and remelted Rooiberg Group lavas and from granophyres interpreted to be differentiation products of the cumulate rocks that make up the Bushveld Complex. All of these rocks were found to possess εHf (2.06 Ga) statistically indistinguishable from the intrusion-wide average εHf (2.06 Ga) value of -8.6 ± 1.2 of the Bushveld Complex. Our results, combined with chronologic and field relations, suggest that the felsic rocks were generated by fractional crystallization of Bushveld mafic liquids, including those that gave rise to the cumulate rocks of the Bushveld Complex.

KW - Bushveld Complex

KW - Hf isotopes

KW - Rooiberg Group

KW - Rustenburg Layered Suite

KW - Stavoren Granophyre

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M3 - Letter

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SN - 0024-4937

VL - 248-251

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EP - 477

JO - Lithos

JF - Lithos

ER -

Hf isotopic evidence for a cogenetic magma source for the Bushveld Complex and associated felsic magmas

Abstract

Funding

Keywords

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