SHRIMP U-Pb zircon age for the Segwagwa-Masoke Igneous Complex of southeastern Botswana and implications for the deformation history of the Achaean to Proterozoic Transvaal Supergroup of southern Africa

R. B M Mapeo, M. T D Wingate

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Abstract

Geological mapping in the Transvaal-Kanye Basin of Botswana has led to the identification of a suite of elliptical igneous complexes comprising granite, diorite, syenite and rhyolite. The Segwagwa-Masoke Igneous Complex is one of these intrusive units in southeastern Botswana. New SHRIMP U-Pb zircon data for a granite phase of this complex indicate a crystallisation age of 2054 ± 9 Ma, confirming its temporal link with the ca. 2.05 Ga Bushveld Large Igneous Province of South Africa. The Segwagwa-Masoke Igneous Complex and sedimentary rocks of the upper part of the Transvaal Supergroup are jointly deformed into E-W trending F2 folds and N-S, NW-SE and NE-SW trending F3 folds. Because the Segwagwa-Masoke Igneous Complex intrudes the Segwagwa Group in the upper part of the Transvaal Supergroup metasedimentary succession, the new U-Pb zircon data for this complex provides a younger limit of ca. 2054 Ma for deposition of the Segwagwa Group and its subsequent regional D3 deformation. It is likely that D3 deformation of the Transvaal Supergroup post-dating the Bushveld Igneous Complex was synchronous with granulite facies metamorphism and deformation in the Limpopo belt or is related to the closing of the Magondi basin during the Magondi orogeny.

Original languageEnglish
Pages (from-to)97-106
Number of pages10
JournalJournal of African Earth Sciences
Volume54
Issue number3-4
DOIs
Publication statusPublished - Jun 2009
Externally publishedYes

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Proterozoic
zircon
granite
history
fold
large igneous province
syenite
geological mapping
diorite
granulite facies
rhyolite
basin
orogeny
sedimentary rock
crystallization
metamorphism
Southern Africa
dating
Africa
young

Cite this

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title = "SHRIMP U-Pb zircon age for the Segwagwa-Masoke Igneous Complex of southeastern Botswana and implications for the deformation history of the Achaean to Proterozoic Transvaal Supergroup of southern Africa",
abstract = "Geological mapping in the Transvaal-Kanye Basin of Botswana has led to the identification of a suite of elliptical igneous complexes comprising granite, diorite, syenite and rhyolite. The Segwagwa-Masoke Igneous Complex is one of these intrusive units in southeastern Botswana. New SHRIMP U-Pb zircon data for a granite phase of this complex indicate a crystallisation age of 2054 ± 9 Ma, confirming its temporal link with the ca. 2.05 Ga Bushveld Large Igneous Province of South Africa. The Segwagwa-Masoke Igneous Complex and sedimentary rocks of the upper part of the Transvaal Supergroup are jointly deformed into E-W trending F2 folds and N-S, NW-SE and NE-SW trending F3 folds. Because the Segwagwa-Masoke Igneous Complex intrudes the Segwagwa Group in the upper part of the Transvaal Supergroup metasedimentary succession, the new U-Pb zircon data for this complex provides a younger limit of ca. 2054 Ma for deposition of the Segwagwa Group and its subsequent regional D3 deformation. It is likely that D3 deformation of the Transvaal Supergroup post-dating the Bushveld Igneous Complex was synchronous with granulite facies metamorphism and deformation in the Limpopo belt or is related to the closing of the Magondi basin during the Magondi orogeny.",
keywords = "Deformation, Geochronology, Kaapvaal craton, Limpopo belt, Magondi orogeny, Segwagwa-Masoke Complex, Transvaal Supergroup",
author = "Mapeo, {R. B M} and Wingate, {M. T D}",
year = "2009",
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T1 - SHRIMP U-Pb zircon age for the Segwagwa-Masoke Igneous Complex of southeastern Botswana and implications for the deformation history of the Achaean to Proterozoic Transvaal Supergroup of southern Africa

AU - Mapeo, R. B M

AU - Wingate, M. T D

PY - 2009/6

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N2 - Geological mapping in the Transvaal-Kanye Basin of Botswana has led to the identification of a suite of elliptical igneous complexes comprising granite, diorite, syenite and rhyolite. The Segwagwa-Masoke Igneous Complex is one of these intrusive units in southeastern Botswana. New SHRIMP U-Pb zircon data for a granite phase of this complex indicate a crystallisation age of 2054 ± 9 Ma, confirming its temporal link with the ca. 2.05 Ga Bushveld Large Igneous Province of South Africa. The Segwagwa-Masoke Igneous Complex and sedimentary rocks of the upper part of the Transvaal Supergroup are jointly deformed into E-W trending F2 folds and N-S, NW-SE and NE-SW trending F3 folds. Because the Segwagwa-Masoke Igneous Complex intrudes the Segwagwa Group in the upper part of the Transvaal Supergroup metasedimentary succession, the new U-Pb zircon data for this complex provides a younger limit of ca. 2054 Ma for deposition of the Segwagwa Group and its subsequent regional D3 deformation. It is likely that D3 deformation of the Transvaal Supergroup post-dating the Bushveld Igneous Complex was synchronous with granulite facies metamorphism and deformation in the Limpopo belt or is related to the closing of the Magondi basin during the Magondi orogeny.

AB - Geological mapping in the Transvaal-Kanye Basin of Botswana has led to the identification of a suite of elliptical igneous complexes comprising granite, diorite, syenite and rhyolite. The Segwagwa-Masoke Igneous Complex is one of these intrusive units in southeastern Botswana. New SHRIMP U-Pb zircon data for a granite phase of this complex indicate a crystallisation age of 2054 ± 9 Ma, confirming its temporal link with the ca. 2.05 Ga Bushveld Large Igneous Province of South Africa. The Segwagwa-Masoke Igneous Complex and sedimentary rocks of the upper part of the Transvaal Supergroup are jointly deformed into E-W trending F2 folds and N-S, NW-SE and NE-SW trending F3 folds. Because the Segwagwa-Masoke Igneous Complex intrudes the Segwagwa Group in the upper part of the Transvaal Supergroup metasedimentary succession, the new U-Pb zircon data for this complex provides a younger limit of ca. 2054 Ma for deposition of the Segwagwa Group and its subsequent regional D3 deformation. It is likely that D3 deformation of the Transvaal Supergroup post-dating the Bushveld Igneous Complex was synchronous with granulite facies metamorphism and deformation in the Limpopo belt or is related to the closing of the Magondi basin during the Magondi orogeny.

KW - Deformation

KW - Geochronology

KW - Kaapvaal craton

KW - Limpopo belt

KW - Magondi orogeny

KW - Segwagwa-Masoke Complex

KW - Transvaal Supergroup

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U2 - 10.1016/j.jafrearsci.2009.03.007

DO - 10.1016/j.jafrearsci.2009.03.007

M3 - Article

VL - 54

SP - 97

EP - 106

JO - Journal of African Earth Science

JF - Journal of African Earth Science

SN - 1464-343X

IS - 3-4

ER -