gary stevens (et jean-françois moyen , alex kisters, johann diener)
DESCRIPTION
Une orog é n è se subduction-collision à l'arch é en : m é tamorphisme HP-BT à 3.2 Ga à Barberton (Afrique du Sud). Gary Stevens (et Jean-François Moyen , Alex Kisters, Johann Diener). Stellenbosch University, South Africa. Percival, 1994 In Condie ed. “Archean crustal evolution”. - PowerPoint PPT PresentationTRANSCRIPT
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Une orogénèse subduction-collision
à l'archéen : métamorphisme HP-BT à 3.2 Ga à Barberton (Afrique du Sud)
Gary Stevens(et Jean-François Moyen, Alex Kisters, Johann Diener)
Stellenbosch University, South Africa
![Page 2: Gary Stevens (et Jean-François Moyen , Alex Kisters, Johann Diener)](https://reader035.vdocuments.mx/reader035/viewer/2022062520/56815ce3550346895dcae7bd/html5/thumbnails/2.jpg)
Percival, 1994In Condie ed. “Archean crustal evolution”
![Page 3: Gary Stevens (et Jean-François Moyen , Alex Kisters, Johann Diener)](https://reader035.vdocuments.mx/reader035/viewer/2022062520/56815ce3550346895dcae7bd/html5/thumbnails/3.jpg)
2.9 – 2.7 Ga granites3.1 Ga granites & syenites
Moodies
Fig Tree
Onverwacht
Ca. 3.2 Ga TTG
Ca. 3.4 Ga TTG
« Ancient gneisses »(3.6 – 3.4 Ga)
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Die
ner,
2004
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“Inyoni shear zone”
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Inyoni shear zone
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500 m
Gt
Ab
Qz
Gt
Ab
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200 m
Gt
Ab
CpxGt
Ep
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500 m
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100 m
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Gt
Ep+Qz
Amp
500 m
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0.00
0.20
0.40
0.60
0.80
1.00
1.20
5.00 5.50 6.00 6.50 7.00 7.50 8.00
SiT
Na
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Percival, 1994In Condie ed. “Archean crustal evolution”
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Komatii fault
(Pluton de Nelshoogte, syn-extension ?)
Bloc “inférieur”(bloc de Stolzburg)
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Die
ner,
2004