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Steynsdorp Gneiss

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(A) <span class="search-highlight">Steynsdorp</span> <span class="search-highlight">gneisses</span> and layer-parallel leucogranite sheets. (B) Sharp t...
Published: 01 January 2010
Figure 3. (A) Steynsdorp gneisses and layer-parallel leucogranite sheets. (B) Sharp tectonic contact between the Steynsdorp gneiss complex and the overlying amphibolite layers of the Theespruit Formation. The contact is exposed in a river section in NE sector of the dome. (C) Breccia-like clasts
Journal Article
Published: 01 September 2021
South African Journal of Geology (2021) 124 (3): 761–782.
... during igneous zircon crystallization and subsequent compositional alteration. Four rock samples previously dated by SIMS U-Pb using zircon were selected: 3.56 Ga Ngwane Gneiss, 3.55 Ga Theespruit felsic metavolcanic, 3.50 Ga Steynsdorp Gneiss and 2.98 Ga Nhlangano Gneiss. LA-ICP-MS U-Pb zircon ages...
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Image
Three-dimensional (3-D) surface created by interpolation of dip angles meas...
Published: 01 January 2010
-hemisphere projections of the foliation and lineation in the (i) Theespruit rocks, (ii) Steynsdorp gneisses, and (iii) sheeted zone.
Image
(A) Boudinaged pyroxenite (pyx) layer at the base of the Theespruit Formati...
Published: 01 January 2010
Figure 6. (A) Boudinaged pyroxenite (pyx) layer at the base of the Theespruit Formation. The pyroxenite is wrapped around by relatively darker amphibolite (amp) layers. (B) Strongly developed, NE-plunging stretching lineation in felsic bands of the Steynsdorp gneisses. (C) Example of F1
Image
(A) Simplified lithological and structural map of the <span class="search-highlight">Steynsdorp</span> dome. Imag...
Published: 01 January 2010
is overlying the NE-dipping layer-parallel sheets. The variation in dip angle is shown in more detail in Figure 5 . (C) Sketch of a NE-SW cross section showing S1 in the Theespruit Formation, overlying in the Steynsdorp gneisses.
Image
(A) Simplified lithological and structural map of the <span class="search-highlight">Steynsdorp</span> dome. Imag...
Published: 01 January 2010
is overlying the NE-dipping layer-parallel sheets. The variation in dip angle is shown in more detail in Figure 5 . (C) Sketch of a NE-SW cross section showing S1 in the Theespruit Formation, overlying in the Steynsdorp gneisses.
Journal Article
Journal: GSA Bulletin
Published: 01 January 2010
GSA Bulletin (2010) 122 (1-2): 183–197.
...Figure 3. (A) Steynsdorp gneisses and layer-parallel leucogranite sheets. (B) Sharp tectonic contact between the Steynsdorp gneiss complex and the overlying amphibolite layers of the Theespruit Formation. The contact is exposed in a river section in NE sector of the dome. (C) Breccia-like clasts...
FIGURES | View All (9)
Image
Block diagrams illustrating tectonic burial and subsequent exhumation of th...
Published: 01 January 2010
Figure 8. Block diagrams illustrating tectonic burial and subsequent exhumation of the Theespruit Formation and Steynsdorp gneisses in the southern Barberton terrane. (A) Development of NE-verging thrusts during the 3230 Ma tectonic collision (D2), and burial of the Theespruit Formation (e.g
Image
Cathodoluminescence (CL) images of selected zircons from samples BA06-2 (Th...
Published: 01 September 2021
Figure 2. Cathodoluminescence (CL) images of selected zircons from samples BA06-2 (Theespruit metavolcanic rock), BA06-3 (Steynsdorp Gneiss), SW06-2 (Ngwane Gneiss) and SW05-1 (Nhlangano Gneiss). Some grains show truncated zoning and embayments (e.g. SW06-2, upper right corner). Other
Image
(A–B) Garnets in clinopyroxene (cpx)-rich layers within metamafic rocks. Th...
Published: 01 January 2010
the contact with the Steynsdorp gneisses. (F) Chemical zonation in the large garnet crystals depicted in D, showing complex mineral chemical zonation that may constitute evidence for two metamorphic events (discussed in the text). The three zones marked by the white, dark-gray, and light-gray bands correspond
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U-Pb geochronological (common Pb uncorrected) and trace elemental data for ...
Published: 01 September 2021
Figure 5. U-Pb geochronological (common Pb uncorrected) and trace elemental data for five ablations of BA06-3 (3.51 to 3.50 Ga Porphyritic GneissSteynsdorp Pluton). Colors represent degrees of discordance (%).
Journal Article
Published: 01 March 2021
South African Journal of Geology (2021) 124 (1): 181–210.
... Formation, as discussed below. The most complete stratigraphy of the Onverwacht Group is present south of the Inyoka Fault, although the lower parts are intruded out by granitoid rocks of the ACG, the ca . 3.51 Ga Steynsdorp Gneiss, and the ca . 3.45 Ga Stolzburg Suite. To the northwest of the Inyoka...
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Journal Article
Journal: GSA Bulletin
Published: 01 November 2015
GSA Bulletin (2015) 127 (11-12): 1558–1563.
... of Mesoarchean TTG gneisses from the middle crust: Insights from the Steynsdorp core complex, Barberton granitoid-greenstone terrain, South Africa : Geological Society of America Bulletin , v. 122 , p. 183 – 197 , doi:10.1130/B26580.1. Lana C. Buick I. Stevens G. Russouw R. De Wet W...
FIGURES
Journal Article
Journal: GSA Bulletin
Published: 01 November 2015
GSA Bulletin (2015) 127 (11-12): 1550–1557.
.... Kisters A.F.M. Stevens G. , 2010a , Exhumation of Mesoarchean TTG gneisses from the middle crust: Insights from the Steynsdorp core complex, Barberton granitoid-greenstone terrain, South Africa : Geological Society of America Bulletin , v. 122 , p. 183 – 197 , doi:10.1130/B26580.1. Lana...
Journal Article
Published: 01 January 2013
Journal of the Geological Society (2013) 170 (1): 215–223.
... . 2008 ). The subduction–accretion event ended in the collision of two major terranes (or terrane collages), which are characterized by distinct granitoid intrusion ages and isotope patterns. The Barberton South Terrane (definition of Zeh et al . 2009 ), comprising the Stolzburg, Steynsdorp...
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Journal Article
Journal: GSA Bulletin
Published: 01 March 2014
GSA Bulletin (2014) 126 (3-4): 251–270.
... , doi:10.1016/j.chemgeo.2007.04.008 . Lana C. Kisters A.F.M. Stevens G. , 2010a , Exhumation of Mesoarchean TTG gneisses from the middle crust: Insights from the Steynsdorp core complex, Barberton granitoid-greenstone terrain, South Africa : Geological Society of America Bulletin...
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Journal Article
Published: 01 March 2021
South African Journal of Geology (2021) 124 (1): 163–180.
... of the Onverwacht Group ( De Vries et al., 2006 ; Kisters et al., 2010 ). Tectonic wedges of ca . 3 538 Ma tonalitic gneisses preserved in the ca . 3 453 Ma old Theespruit Formation, in addition to the ca . 3.5 Ga Steynsdorp pluton are highly deformed and interpreted to record deformation during an earlier...
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Journal Article
Published: 01 June 2004
South African Journal of Geology (2004) 107 (1-2): 159–172.
... and Davis, 1994 Tonalite Gneiss, Baberton U-Pb zircon 3538+4–2 magmatic Kamo and Davis, 1994 Steynsdorp Pluton U-Pb zircon 3509+8–7 magmatic Kamo and Davis, 1994 Quartz Feldspar Porphyry U-Pb zircon 3458±8 magmatic Kamo and Davis, 1994 Stolzburg Pluton (olderb Phase) U-Pb...
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Journal Article
Published: 01 March 2021
South African Journal of Geology (2021) 124 (1): 37–52.
... high-grade gneiss terranes, which represent Archaean mid-continental crust, or low-grade granite-greenstone belts, which represent relic Archaean upper continental crust. The Palaeoarchaean East Pilbara Terrane (EPT), Pilbara Craton, Western Australia, and the Barberton Granite-Greenstone Belt (BGGB...
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Journal Article
Journal: Geology
Published: 26 July 2017
Geology (2017) 45 (9): 803–806.
...-magmatic Steynsdorp tonalitic gneisses. All detrital ages are also encompassed by the Ngwane Complex of the AGC. The only known occurrences of very sparse pre–3.6 Ga zircons are as xenocrysts in a granodiorite plug intrusive into the Komati Formation and in the Phophonyane shear zone in the AGC ( Compston...
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