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Achab Gneiss

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Journal Article
Published: 01 August 1986
South African Journal of Geology (1986) 89 (2): 103–116.
Image
U-Pb concordia diagram for zircons from megacrystic <span class="search-highlight">Achab</span> <span class="search-highlight">Gneiss</span> (sample NF...
Published: 01 March 2007
Figure 7. U-Pb concordia diagram for zircons from megacrystic Achab Gneiss (sample NF 129)
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U-Pb concordia diagram for zircons from banded <span class="search-highlight">Achab</span> <span class="search-highlight">Gneiss</span> (sample NF 10)....
Published: 01 March 2007
Figure 8. U-Pb concordia diagram for zircons from banded Achab Gneiss (sample NF 10).
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U-Pb concordia diagram for zircons from banded <span class="search-highlight">Achab</span> <span class="search-highlight">Gneiss</span> (sample NF 8). ...
Published: 01 March 2007
Figure 9. U-Pb concordia diagram for zircons from banded Achab Gneiss (sample NF 8). The inset shows the age distribution of older cores.
Journal Article
Journal: Economic Geology
Published: 01 May 2009
Economic Geology (2009) 104 (3): 385–404.
... and overlying the Achab Gneiss, an approximately 2.0 Ga basement complex, with no known Archean crustal history. The supracrustal sequence was thought to include the Hoogoor “pink” metavolcanic gneiss at the base and the ore-bearing metaquartzites to be unconformably overlain by the 1650 Ma Koeris Formation...
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Cathodoluminescent (CL) images of zircons from the granitic <span class="search-highlight">gneisses</span>. ( a )...
Published: 01 March 2007
Figure 6. Cathodoluminescent (CL) images of zircons from the granitic gneisses. ( a ) Megacrystic Achab Gneiss (NF 129), ( b ) Banded Achab Gneiss (NF 10), ( c ) Banded Achab Gneiss (NF 8), ( d ) Hoogoor Gneiss (NF 328), ( e ) Aroams Gneiss (NF 96), ( f ) Aroams Gneiss (NF 64), ( g ) Aroams
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MORB-normalised spidergrams and chondrite-normalised REE plots for the gnei...
Published: 01 March 2007
in the Hoogoor and Aroams Gneisses plots and average A-, I- and S-type granites are shown for comparison in the Achab Gneiss plot. Chondrite normalisation is to average chondrite values, as determined by Nakamura (1974) with additional values for Pr, Tb, Ho and Tm from Boynton (1984) .
Journal Article
Published: 01 March 2007
South African Journal of Geology (2007) 110 (1): 87–110.
...Figure 7. U-Pb concordia diagram for zircons from megacrystic Achab Gneiss (sample NF 129) ...
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Photographs of the Aggeneys Granite Suite.( a ) Photograph of the <span class="search-highlight">Achab</span> Gne...
Published: 01 March 2007
Figure 3. Photographs of the Aggeneys Granite Suite.( a ) Photograph of the Achab Gneiss (sample NF 123). Coarse porphyroblastic augen of alkali feldspar and quartz occur within a fine- to medium-grained matrix of biotite, quartz and plagioclase. A prominent foliation is defined by the alignment
Journal Article
Published: 01 March 2008
South African Journal of Geology (2008) 111 (1): 109–111.
... Formation; Dark-type Quartzite – Wortel Formation; Ore Schist – Hotson Formation ( Gams Member ); Shaft Schist – T’hammaberg Formation ; Koeris Formation Amphibolite – Koeris Formation. Achab Gneiss (samples NF 129, NF 8) – Achab Gneiss; Achab Gneiss (sample NF 10...
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Journal Article
Journal: Economic Geology
Published: 01 December 2009
Economic Geology (2009) 104 (8): 1282–1285.
...-graphic nomenclature from and cites McClung (2006) as an unpublished Ph.D. thesis; neither paper cites Cornell and Pettersson (2007) ; only three months publication interval (?) January 2007 Cornell and Pettersson publish in Journal of African Earth Science: Ion probe dating of the Achab Gneiss...
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Journal Article
Published: 01 December 2012
South African Journal of Geology (2012) 115 (4): 449–464.
... whole rock), interpreted by Cornell et al. (2009) to be the provenance age. At one time the Achab gneiss was proposed as the basement (e.g. Watkeys, 1986 ) but this deduction was disputed because of the presence of Wortel Formation xenoliths (regional sequence mapping: Praekelt and Colliston, 1988...
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Journal Article
Published: 01 December 2012
South African Journal of Geology (2012) 115 (4): 417–448.
... 1.13 and 1.06 Ga 36 ; 1.13 Ga – age of Koeris Fm deposition and metabasalt 36 ; 1.135 Ga zr xenocrysts and cores in Spektakel Suite 33 , 35 ; 1.14 Ga zr cores in Bushmanland Grp 37 ; 1.15 – age Hoogoor Gneiss 36 ; 1.16–1.17 Ga – age Achab Gneiss 41 , metabasite sill 33 , 42 ; 1.165 Ga rims on zrs...
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Journal Article
Journal: Economic Geology
Published: 01 December 2009
Economic Geology (2009) 104 (8): 1277–1281.
... thesis, Johannesburg, South Africa , University of Johannesburg , 429 p. Watkeys , M.K. , 1986 , The Achab Gneiss: A “floor” in Bushmanland or a flaw in Namaqualand? : Transactions of the Geological Society of South Africa , v. 89 , p. 103 – 116 . ...
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Journal Article
Published: 01 September 2006
South African Journal of Geology (2006) 109 (3): 369–392.
... of metaquartzite. Intrusive Rocks Lithological Description Achab Gneiss Migmatitic leucogneiss. Aroams Gneiss Megacrystic quartz-feldspar-biotite granite. Boerputs Gneiss Well-foliated quartz-feldspar-(biotite) gneiss with occasional megacrystic bands. Coboop Gneiss Leucocratic...
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Journal Article
Published: 01 September 2004
Geological Magazine (2004) 141 (5): 629–643.
... and phyllites of the southern subunit of the Badenweiler–Lenzkirch Zone, only poorly preserved microfossil remains could be detected. These show that the sedimentation ages must be Ordovician or younger, but still probably Early Palaeozoic. High-grade metapelitic rocks of the South Schwarzwald Gneiss Complex...
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Series: Geological Society, London, Special Publications
Published: 01 January 2009
DOI: 10.1144/SP323.10
EISBN: 9781862395718
... 0.511812 0.002 1122 1445 Coboop Muscovite biotite augen granite gneiss DC0397 28°52.223′ 19°20.312′ Ri 3.30 24.6 0.08200 0.1 0.511072 0.002 2075 2274 Aroams Biotite granite gneiss DC0399 29°07.030′ 19°24.258′ Bu 8.50 45.2 0.1140 0.1 0.511521 0.002 2054 2322 Achab...
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Journal Article
Published: 01 March 2007
South African Journal of Geology (2007) 110 (1): 59–86.
...). These arguments have suggested that the present-day basement, a series of granitic gneisses termed the Achab and Hoogoor Gneisses, are older than the Bushmanland Group and acted as the basement and provenance to the metasediments and source of the base metal mineralisation. These arguments have been made based...
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Journal Article
Published: 01 March 2005
South African Journal of Geology (2005) 108 (1): 35–50.
... that is underlain by a variety of quartzo-feldspathic gneisses (Figure 1b ), the origin of which remains enigmatic. Structural and isotopic evidence favours the Achab Gneiss to represent remnants of a Kheisian (2000–1800 Ma) basement ( Watkeys, 1986 ; Armstrong et al. , 1988 ; Reid et al. , 1997 ), whereas...
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Journal Article
Published: 01 September 2019
Bulletin of Canadian Petroleum Geology (2019) 67 (3): 185–214.
... of Hudson Strait) that penetrate below Mesozoic strata terminate in Precambrian granites or gneisses, with no intervening Paleozoic rocks ( Bell and Howie, 1990 ). 01 02 2019 15 09 2019 Copyright © 2019, The Canadian Society of Petroleum Geologists 2019 The Total Eastcan et al. Tyrk...
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