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Tobolsk Formation

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( A ) Irregular chlorite-filled amygdale from the <span class="search-highlight">Tobolsk</span> <span class="search-highlight">Formation</span> in eSwa...

( A ) Irregular chlorite-filled amygdale from the Tobolsk Formation in eSwa...

Published: 01 March 2020
Figure 4. ( A ) Irregular chlorite-filled amygdale from the Tobolsk Formation in eSwatini in plane-polarized light. ( B ) Irregular chlorite-filled amygdale with a microcrystalline quartz reaction rim from the Agatha Formation in eSwatini in plane-polarized light. ( C ) Subspherical calcite
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( A ) Example of a CT image slice of the <span class="search-highlight">Tobolsk</span> <span class="search-highlight">Formation</span> in eSwatini, cor...

( A ) Example of a CT image slice of the Tobolsk Formation in eSwatini, cor...

Published: 01 March 2020
Figure 5. ( A ) Example of a CT image slice of the Tobolsk Formation in eSwatini, corresponding to Figure 4A . ( B ) Example of a representative CT image slice of the Agatha Formation in South Africa, corresponding to Figure 4C . ( C ) Example of a typical CT image slice taken of a Fortescue
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Occurrences of the <span class="search-highlight">Tobolsk</span> <span class="search-highlight">Formation</span> volcanic sequences in Swaziland. ( A )...

Occurrences of the Tobolsk Formation volcanic sequences in Swaziland. ( A )...

Published: 01 June 2013
Figure 11 Occurrences of the Tobolsk Formation volcanic sequences in Swaziland. ( A ) The Mooihoek area of western Swaziland modified after Nhleko (2003) and Mhlanga (2002) . A thickness of 120 m of volcanic rocks is preserved in a northwest-trending synform. Rhyodacite lavas are preserved
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Comparison between the Crown <span class="search-highlight">Formation</span> and the Bird Member lavas with the T...

Comparison between the Crown Formation and the Bird Member lavas with the T...

Published: 01 September 2021
Figure 9. Comparison between the Crown Formation and the Bird Member lavas with the Tobolsk Formation ( a ) and the Ntanyana Formation ( b ) lavas of the Mozaan Group, respectively. ( c ) show different ratios of chondrite normalized REE. ( d ) is a close-up of the Figure 4c including
Journal Article

VOLCANIC AND VOLCANICLASTIC ROCKS OF THE MESOARCHAEAN PONGOLA SUPERGROUP IN SOUTH AFRICA AND SWAZILAND: DISTRIBUTION, PHYSICAL CHARACTERISTICS, STRATIGRAPHY AND CORRELATIONS

A. WILSON, B. GROENEWALD, C. PALMER
Published: 01 June 2013
South African Journal of Geology (2013) 116 (1): 119–168.
DOI: https://doi.org/10.2113/gssajg.116.1.119
...Figure 11 Occurrences of the Tobolsk Formation volcanic sequences in Swaziland. ( A ) The Mooihoek area of western Swaziland modified after Nhleko (2003) and Mhlanga (2002) . A thickness of 120 m of volcanic rocks is preserved in a northwest-trending synform. Rhyodacite lavas are preserved...
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Isopach map of the Bivane Subgroup of the Nsuze Group and the <span class="search-highlight">Tobolsk</span> Forma...

Isopach map of the Bivane Subgroup of the Nsuze Group and the Tobolsk Forma...

Published: 01 June 2013
Figure 26 Isopach map of the Bivane Subgroup of the Nsuze Group and the Tobolsk Formation of the Mozaan Group reconstructed prior to the emplacement of the c. 2.85 Ga post-Pongola granitoids on the east side of the basin and the Usushwana Complex in the north. The area covered is that shown
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South-facing overview of the northern limb of the Mdlelanga Syncline, showi...

South-facing overview of the northern limb of the Mdlelanga Syncline, showi...

Published: 01 September 2021
Figure 7. South-facing overview of the northern limb of the Mdlelanga Syncline, showing the boundaries of the Thalu, Hlashana, Delfkom and Tobolsk Formations. Subdivisions a to c of the Hlashana Formation are shown. The Khiphunyawo and Bongaspoort Formations crop out on the far side
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Primitive mantle-normalized ( McDonough et al., 1992 ) incompatible element...

Primitive mantle-normalized ( McDonough et al., 1992 ) incompatible element...

Published: 01 December 2017
Figure 6. Primitive mantle-normalized ( McDonough et al., 1992 ) incompatible element distribution of amphibolite in comparison with mafic volcanic rocks of the Agatha Formation of the Nsuze Group and Tobolsk Formation of the Mozaan Group ( Nhleko, 2003 ).
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Chondrite-normalized ( Boynton, 1984 ) REE patterns for amphibolite samples...

Chondrite-normalized ( Boynton, 1984 ) REE patterns for amphibolite samples...

Published: 01 December 2017
Figure 7 Chondrite-normalized ( Boynton, 1984 ) REE patterns for amphibolite samples. The composition of mafic volcanic rocks from the Agatha and Tobolsk formations (Pongola Supergroup, Nhleko, 2003 ) and the Kromberg Complex, Barberton Greenstone Belt ( Furnes, 2012 ) are plotted
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Geological map of the Pongola Supergroup in South Africa and eSwatini. Star...

Geological map of the Pongola Supergroup in South Africa and eSwatini. Star...

Published: 01 March 2020
Figure 1. Geological map of the Pongola Supergroup in South Africa and eSwatini. Stars represent localities sampled in this study. Star A: Agatha Formation in the Mahlangatsha area in eSwatini (S26.88995°, E031.02634°). Star B: Tobolsk Formation in the Mooihoek area in eSwatini (S26.98411
Journal Article

A geochemical study of the Crown Formation and Bird Member lavas of the Mesoarchaean Witwatersrand Supergroup, South Africa

F. Humbert, A. Hofmann, M. de Kock, A. Agangi, Y-M. Chou, P.W. Mambane
Published: 01 September 2021
South African Journal of Geology (2021) 124 (3): 663–684.
DOI: https://doi.org/10.25131/sajg.124.0022
...Figure 9. Comparison between the Crown Formation and the Bird Member lavas with the Tobolsk Formation ( a ) and the Ntanyana Formation ( b ) lavas of the Mozaan Group, respectively. ( c ) show different ratios of chondrite normalized REE. ( d ) is a close-up of the Figure 4c including...
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Journal Article

Vesicle paleobarometry in the Pongola Supergroup: A cautionary note and guidelines for future studies

E.A. Goosmann, R. Buick, D.C. Catling, C. Luskin, N. Nhleko
Published: 01 March 2020
South African Journal of Geology (2020) 123 (1): 95–104.
DOI: https://doi.org/10.25131/sajg.123.0005
...Figure 4. ( A ) Irregular chlorite-filled amygdale from the Tobolsk Formation in eSwatini in plane-polarized light. ( B ) Irregular chlorite-filled amygdale with a microcrystalline quartz reaction rim from the Agatha Formation in eSwatini in plane-polarized light. ( C ) Subspherical calcite...
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Journal Article

A new lithostratigraphic framework for portions of the Pongola Supergroup within the Nkandla sub-basin, southern Kaapvaal Craton, South Africa; insights into Mozaan Group stratigraphy

N. Hicks, D.J.C. Gold, M. Ncume, L. Hoyer
Published: 01 September 2021
South African Journal of Geology (2021) 124 (3): 717–734.
DOI: https://doi.org/10.25131/sajg.124.0039
...Figure 7. South-facing overview of the northern limb of the Mdlelanga Syncline, showing the boundaries of the Thalu, Hlashana, Delfkom and Tobolsk Formations. Subdivisions a to c of the Hlashana Formation are shown. The Khiphunyawo and Bongaspoort Formations crop out on the far side...
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Spore-pollen diagram of the Turtas <span class="search-highlight">Formation</span> section (village of Zashchitin...

Spore-pollen diagram of the Turtas Formation section (village of Zashchitin...

Published: 01 February 2016
Fig. 4. Spore-pollen diagram of the Turtas Formation section (village of Zashchitino to the north of the city of Tobolsk). 1, clay, 2, sands 3, silts, 4, a break in sedimentation, 5, palynomorphs content of less than 1%.
Journal Article

Orogeny of the Urals

Anatole Safonov
Journal: AAPG Bulletin
Published: 01 November 1937
AAPG Bulletin (1937) 21 (11): 1439–1463.
DOI: https://doi.org/10.1306/3D932F2A-16B1-11D7-8645000102C1865D
... is concealed by Tertiary and later sediments. The grain of the formations is longitudinal, with the regions of Kara-Tau and Ufaley as marked exceptions. The structure of the central metamorphic ridges is predominantly sharply anticlinal. The Uralian geosyncline, apparently a rift zone between the Russian...
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( a ) Variation diagrams displaying the content of selected major element o...

( a ) Variation diagrams displaying the content of selected major element o...

Published: 01 September 2021
Figure 6. ( a ) Variation diagrams displaying the content of selected major element oxides and trace elements of the Crown Formation and Bird Member lavas as well as the Tobolsk and Ntanyana formations lavas of the Mozaan Group. ( b ) AFM diagrams for same samples as in Figure 6 with A = Na 2 O
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Generalized stratigraphic column of the Pongola Supergroup in South Africa ...

Generalized stratigraphic column of the Pongola Supergroup in South Africa ...

Published: 01 March 2020
atop the Nsuze Group, which is visible in the White Mfolozi River gorge ( Figure 1 star C). The formation names surrounded by red boxes, Agatha and Tobolsk, are those that were sampled in this study. After Gold (2006) , Wilson and Hofmann (2013) and Wilson et al. (2013) .
Journal Article

Foliar Physiognomic Record of Climatic Conditions during Dormancy: Climate Leaf Analysis Multivariate Program (CLAMP) and the Cold Month Mean Temperature

Robert A. Spicer, Alexei B. Herman, Elizabeth M. Kennedy
Published: 01 November 2004
The Journal of Geology (2004) 112 (6): 685–702.
DOI: https://doi.org/10.1086/424579
... 75.1 4.2 28.8 7 Vagai .7 19.0 −19.7 38.7 3.9 465.0 236.0 57.0 227.0 51.0 73.4 3.9 28.7 8 Suklyom River .3 18.8 −20.2 39.0 3.7 470.0 226.0 58.0 221.0 48.0 74.7 4.1 28.7 9 Tobolsk .3 18.8 −20.2 39.0 3.7 470.0 225.0 58.0 221.0 48.0 74.7 4.1 28.7 10...
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Journal Article

Supracrustal gneisses in southern Swaziland: a basalt-sandstone assemblage of the upper Mozaan Group deformed in the Neoarchaean

N. Dlamini, A. Hofmann, G. Belyanin, H. Xie, A. Kröner, A. Wilson, A. Slabunov
Published: 01 December 2017
South African Journal of Geology (2017) 120 (4): 477–498.
DOI: https://doi.org/10.25131/gssajg.120.4.477
...Figure 6. Primitive mantle-normalized ( McDonough et al., 1992 ) incompatible element distribution of amphibolite in comparison with mafic volcanic rocks of the Agatha Formation of the Nsuze Group and Tobolsk Formation of the Mozaan Group ( Nhleko, 2003 ). ...
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Journal Article

The Bazhenov Horizon of West Siberia: structure, correlation, and thickness

S.V. Ryzhkova, L.M. Burshtein, S.V. Ershov, V.A. Kazanenkov, A.E. Kontorovich, V.A. Kontorovich, A.Yu. Nekhaev, B.L. Nikitenko, M.A. Fomin, B.N. Shurygin, A.L. Beizel, E.V. Borisov, O.V. Zolotova, L.M. Kalinina, E.V. Ponomareva
Published: 01 July 2018
Russ. Geol. Geophys. (2018) 59 (7): 846–863.
DOI: https://doi.org/10.1016/j.rgg.2018.07.009
..., and Tobolsk ( Braduchan et al., 1986 ). The Chuelsk-type section (northern parts of the Tutleim Formation) is characterized by high gamma-ray (up to 40 µR/h) and apparent resistivity (up to 20 Ohm·m) values in the upper unit, which decrease further westward in the lower unit. The Chuelsk-type section...
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