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Nabas Beds

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Schematized stratigraphic subdivision of the <b>Nabas</b> <b>Beds</b> as defined by  De V...
Published: 01 March 2012
Figure 6. Schematized stratigraphic subdivision of the Nabas Beds as defined by De Villiers and Söhnge (1959) . Thicknesses are estimated. The uppermost part of the Nabas Beds, named the Nabas Member, predominantly represents the fill of a deep probably glacigenic palaeovalley.
Journal Article
Published: 01 March 2012
South African Journal of Geology (2012) 115 (1): 91-102.
...Figure 6. Schematized stratigraphic subdivision of the Nabas Beds as defined by De Villiers and Söhnge (1959) . Thicknesses are estimated. The uppermost part of the Nabas Beds, named the Nabas Member, predominantly represents the fill of a deep probably glacigenic palaeovalley. ...
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Journal Article
Journal: GSA Bulletin
Published: 01 September 2013
GSA Bulletin (2013) 125 (9-10): 1580-1598.
... different types of mélanges that formed sequentially through time. The broken formation is the oldest unit in the accretionary wedge and shows bedding-parallel boudinage structures, which developed as a result of layer-parallel extension at the toe of the internal part of the Alpine wedge front during...
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Figure 2. (A) Lower-hemisphere, equal-area projection showing the geometric...
Published: 01 June 2002
bedding, early-stage structures, and tectonic mélange, indicating that they were active late in the deformation history of the material. Accordingly, the movement planes in C are plotted in their present orientations. (D) Map showing underthrusting directions inferred from paleokinematic data (at tails
Series: GSA Special Papers
Published: 15 August 2018
DOI: 10.1130/2018.2534(08)
EISBN: 9780813795348
... intruded. For this purpose, we used the bedding attitude of the nearby sedimentary strata, which generally dip 80°NW with 45°NE strike. Untilting around P o by the amount of 63° in the same way as done for the gabbro made these strata dip 22°NW and strike 69°. If we add 10° margin of error to the mean...
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Journal Article
Journal: GSA Bulletin
Published: 01 June 2002
GSA Bulletin (2002) 114 (6): 656-664.
... bedding, early-stage structures, and tectonic mélange, indicating that they were active late in the deformation history of the material. Accordingly, the movement planes in C are plotted in their present orientations. (D) Map showing underthrusting directions inferred from paleokinematic data (at tails...
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Journal Article
Journal: GSA Bulletin
Published: 01 July 2009
GSA Bulletin (2009) 121 (7-8): 1190-1203.
... dimensions exceeding tens of centimeters. This applies to bedding and other sedimentary structures associated with chert layers, interbedded limestone and chert, and debris-flow deposits of variable clast size set in a finer-grained matrix of basalt, limestone, and chert. D −1 is only recognized from...
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Journal Article
Published: 01 June 2013
South African Journal of Geology (2013) 116 (1): 169-181.
... chert beds and banded iron formation; (3) a sandy dolomite unit; (4) a sequence of interbedded conglomerate-greywacke-siltstone-shale units and; (5) a greywacke sequence intercalated with a polymictic conglomerate marker bed locally termed the Dembam Member ( Peters, 2011 ; Tshibubudze and Hein, 2013...
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Journal Article
Journal: Economic Geology
Published: 01 January 2017
Economic Geology (2017) 112 (1): 145-168.
... and granitoid intrusions D 2 NW-SE compression deposition of Tarkwaian sediments D 1 (Tangaean event) NW to NNW thrusts D 1 dome and basin geometries Transitional period between magmatic and tectonic accretion D 1 flat-lying bedding parallel shearing D 3 NW-SE transpression D 4 N-S...
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Journal Article
Published: 16 April 2018
Geological Magazine (2019) 156 (5): 849-873.
... succession consists of: – calcarenite–shale interval (Olenekian). Thinly bedded calcarenite and shale related to deposition in a shoreface/offshore transition environment. – biogenic limestone interval (Anisian–Ladinian). Algal limestone related to carbonate platforms or isolated build-ups...
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Journal Article
Published: 24 September 2018
Journal of Paleontology (2019) 93 (1): 25-36.
... ). The beds bearing the bivalves described here belong to sub-biofacies A2, characterized by taxonomically and ecologically highly diverse assemblages, dominated by epifauna with a large percentage of cemented organisms ( Table 1 ). Table 1. Associated fauna in beds bearing Neuquemya leanzaorum n...
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Series: Geological Society, London, Geology of Series
Published: 01 January 2016
DOI: 10.1144/GOJ.3
EISBN: 9781862397064
... to the Suo Belt in view of the radiometric ages obtained from deformed metagabbro (245-237 Ma: Nishimura & Shibata 1989). Pumpellyite-actinolite facies metapelite contains rare Middle Permian radiolarian fossils ( Takeshita et al. 1987 ). Bedded chert is more dominant as a protolith of the schist...
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Journal Article
Journal: Economic Geology
Published: 01 November 2017
Economic Geology (2017) 112 (7): 1571-1593.
... rocks with a penetrative foliation are confined to the eastern side of the belt, north of Tongon. The profile of geophysical anomalies associated with stratigraphic units in images of the magnetic and electromagnetic (EM) data imply that bedding generally dips >60° to the northwest, an inference...
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Journal Article
Journal: Economic Geology
Published: 01 January 2017
Economic Geology (2017) 112 (1): 23-47.
...-bedded and characterized by abundant thin (0.2–2 cm) argillaceous-silty interbeds. The impure limestones have recrystallized as silty marbles adjacent to the Sadiola shear zone and, to a lesser extent, along the steep NNE-trending shear zones. Detrital sedimentary rocks crop out on the western walls...
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Journal Article
Journal: Geophysics
Published: 24 May 2013
Geophysics (2013) 78 (3): WB113-WB126.
... is associated with localized planar or curviplanar Retrograde Schist zones displaying well-developed and intense schistosity comprising retrograde mica and chlorotite minerals and strongly deformed metasediment bedding. Retrograde Schist zones generally displace rock units they intersect, fulfilling the role...
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Journal Article
Journal: GSA Bulletin
Published: 31 August 2017
GSA Bulletin (2018) 130 (1-2): 238-262.
... of outcrops limits their interpretation. The Miocene–Pliocene sediments discordantly overlie the Kiriaki complex and preserve either subhorizontal bedding (Loc1 and Loc2) or bedding dipping toward the south (at Provotas). Figure 6. Synoptic diagram of the major structures in the metamorphic basement...
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Journal Article
Published: 01 January 2013
Reviews in Mineralogy and Geochemistry (2013) 75 (1): 7-46.
...://MinDat.org ). While some occurrences of moissanite are apparently of near-surface origin, including sites of forest fires and contact metamorphism of silicate magmas with coal beds ( Sameshima and Rodgers 1990 ), silicon carbide also represents one of the deepest mantle minerals known to reach the surface...
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Series: Geological Society, London, Geology of Series
Published: 01 January 2016
DOI: 10.1144/GOJ.6
EISBN: 9781862397064
... (such as the Yobuno Unit). The Kiku Unit consists of basaltic volcaniclastic rocks overlain progressively by bedded chert, siliceous mudstone, felsic tuff, alternations of sandstone and mudstone, and sandstone. Middle Permian radio-larian fossils have been reported from chert and felsic tuff, and Middle-Late Permian...
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