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Publié par | julius-maximilians-universitat_wurzburg |
Publié le | 01 janvier 2009 |
Nombre de lectures | 28 |
Poids de l'ouvrage | 25 Mo |
Extrait
The Neoarchean and Palaeoproterozoic metamorphic evolution
of the Limpopo Belt’s Central Zone in southern Africa
New insights from petrological investigations on amphibolite to granulite
facies rocks
Dissertation zur Erlangung
des naturwissenschaftlichen Doktorgrades
der Bayerischen Julius-Maximilians-Universität Würzburg
vorgelegt von
Leo Jakob Millonig
aus
Würzburg
Würzburg 2009
Eingereicht am:
1. Gutachter:
2. Gutachter:
der Dissertation
1. Prüfer:
2. Prüfer:
der mündlichen Prüfung
Tag der mündlichen Prüfung:
Doktorurkunde ausgehändigt am:
In memory of
Prof. Dr. Harald Millonig Contents
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1 Abstract ....................................................................................................................................... 3
2 Zusammenfassung ........................................................................................................................ 4
3 Introduction................................................................................................................................. 6
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5 Analytical techniques...................................................................................................................11
Mahalapye Complex................................................................................................................... 12
6 Geological overview.....................................................................................................................12
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7.1 Si-undersaturated sillimanite-garnet-cordierite gneiss (sample Ma3a).............................................. 15
7.2 Si-undersaturated sillimanite-garnet-cordierite gneiss (sample Ma3c).............................................. 19
7.3 Garnet-biotite-plagioclase gneiss (samples Ma1h/Ma1i).................................................................. 24
8 P-T pseudosections......................................................................................................................28
8.1 Sillimanite-garnet-cordierite gneiss (sample Ma3a) ......................................................................... 28
8.2 Sillimanite-garnet-cordierite gneiss (sample Ma3c) ......................................................................... 33
8.3 Garnet-biotite-plagioclase gneiss (samples Ma1h/Ma1i).................................................................. 38
9 Summary: Metamorphic evolution of the Mahalapye Complex......................................................40
Phikwe Complex ........................................................................................................................ 41
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11 Petrography and Mineral Chemistry.............................................................................................44
11.1 Garnet-biotite amphibolite (sample SP1)........................................................................................ 44
11.2 Garnet-pyroxene amphibolite (sample SP7a) .................................................................................. 46
11.3 Garnet-biotite-sillimanite-cordierite gneiss (sample SP8) ................................................................ 48
11.4 Garnet-plagioclase-biotite gneiss (sample SP9c) .............................................................................. 51
11.5 Garnet-cordierite-orthoamphibole fels (samples SP9d/SP9e)........................................................... 53
12 P-T pseudosections......................................................................................................................57
12.1 Garnet-biotite-sillimanite-cordierite gneiss (sample SP8) ................................................................ 57
12.2 Garnet-cordierite-orthoamphibole fels (sample SP9d)..................................................................... 62
12.3 Garnet-pyroxene amphibolite (sample SP7a) .................................................................................. 67
13 Geothermobarometry ..................................................................................................................70
13.1 Garnet-biotite amphibolite (sample SP1)........................................................................................ 71
13.2 Garnet-pyroxene amphibolite (sample SP7a) .................................................................................. 72
13.3 Garnet-biotite-sillimanite-cordierite gneiss (sample SP8) ................................................................ 74
13.4 Garnet-plagioclase-biotite gneiss (sample SP9c) .............................................................................. 74
13.5 Garnet-cordierite-orthoamphibole fels (samples SP9d/SP9e)........................................................... 75
13.6 Geothermobarometric results from the Phikwe Complex................................................................ 76
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16 Introduction................................................................................................................................80
16.1 The Bulai Pluton - pre-, syn- and post-intrusive features................................................................. 81
17 Petrography, Bulk Rock and Mineral Chemistry ...........................................................................85
17.1 Analytical techniques...................................................................................................................... 85
17.2 Sample Description ............................................................................................