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Gams Formation

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Schematic section of the upper parts of the Gams Formation showing the distribution of ores and metalliferous host-rocks.

Schematic section of the upper parts of the Gams Formation showing the dist... Available to Purchase

Published: 01 April 2005
F ig . 2. Schematic section of the upper parts of the Gams Formation showing the distribution of ores and metalliferous host-rocks.
Image
Schematic cross-sections through the Gams Formation. (a) Section through the base metal ore body at Gamsberg North. (b) Section through the barite body in the southeastern part of Gamsberg. The ore-equivalent schist pinches out as a pyritic quartz-sillimanite-muscovite schist and underlies the unit of massive to laminated barite. The position of borehole Gam77 is indicated.

Schematic cross-sections through the Gams Formation. ( a ) Section through ... Available to Purchase

Published: 01 March 2005
Figure 4. Schematic cross-sections through the Gams Formation. ( a ) Section through the base metal ore body at Gamsberg North. ( b ) Section through the barite body in the southeastern part of Gamsberg. The ore-equivalent schist pinches out as a pyritic quartz-sillimanite-muscovite schist
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Summary of the chemical trends within the Gams Formation. The arrows indicate the direction of increased element concentrations. Elements in parentheses decrease in the direction of the arrows.

Summary of the chemical trends within the Gams Formation. The arrows indica... Available to Purchase

Published: 01 March 2005
Figure 10. Summary of the chemical trends within the Gams Formation. The arrows indicate the direction of increased element concentrations. Elements in parentheses decrease in the direction of the arrows.
Journal Article

CALDERITE-RICH GARNET AND FRANKLINITE-RICH SPINEL IN AMPHIBOLITE-FACIES HYDROTHERMAL SEDIMENTS, GAMSBERG Zn–Pb DEPOSIT, NAMAQUA PROVINCE, SOUTH AFRICA Available to Purchase

Marcel Stalder, Abraham Rozendaal
Published: 01 April 2005
The Canadian Mineralogist (2005) 43 (2): 585–599.
DOI: https://doi.org/10.2113/gscanmin.43.2.585
...F ig . 2. Schematic section of the upper parts of the Gams Formation showing the distribution of ores and metalliferous host-rocks. ...
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View PDF for article title, CALDERITE-RICH GARNET AND FRANKLINITE-RICH SPINEL IN AMPHIBOLITE-FACIES HYDROTHERMAL SEDIMENTS, GAMSBERG Zn–Pb DEPOSIT, NAMAQUA PROVINCE, SOUTH AFRICA
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Journal Article

STRATIGRAPHY OF THE MESOPROTEROZOIC AGGENEYS TERRANE, WESTERN NAMAQUA MOBILE BELT, SOUTH AFRICA Available to Purchase

W.P. COLLISTON, A.E. SCHOCH, H.E. PRAEKELT
Published: 01 December 2012
South African Journal of Geology (2012) 115 (4): 449–464.
DOI: https://doi.org/10.2113/gssajg.115.4.449
... (the Gams Formation), most detailed studies have in the past been restricted to the disrupted zone. The complete stratigraphic column can however be compiled in the zone of lower strain, where it is apparent that the metasediments may be divided into six units. The units of the Aggeneys Subgroup (mentioned...
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View PDF for article title, STRATIGRAPHY OF THE MESOPROTEROZOIC AGGENEYS TERRANE, WESTERN NAMAQUA MOBILE BELT, SOUTH AFRICA
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Journal Article

The Cambrian and Ordovician rocks of the Migneint area, North Wales Available to Purchase

BRYAN D. T. LYNAS
Published: 01 September 1973
Journal of the Geological Society (1973) 129 (5): 481–503.
DOI: https://doi.org/10.1144/gsjgs.129.5.0481
...BRYAN D. T. LYNAS Abstract The stratigraphy, faulting, mineralization and metamorphism of the Upper Cambrian and Ordovician rocks are described. Newly erected formation names are the Afon Gam Formation (Upper Cambrian), the Carnedd Iago, Serw, Llyn Conwy and Rhiw Bach Formations (Ordovician). Two...
View PDF for article title, The Cambrian and Ordovician rocks of the Migneint area, North Wales
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Surface geology of the Gamsberg deposit. The distribution of barite within the Gams Formation is indicated. Sections A-A’ and B-B’ refer to cross-sections depicted in Figure 4.

Surface geology of the Gamsberg deposit. The distribution of barite within ... Available to Purchase

Published: 01 March 2005
Figure 3. Surface geology of the Gamsberg deposit. The distribution of barite within the Gams Formation is indicated. Sections A-A’ and B-B’ refer to cross-sections depicted in Figure 4 .
Image
Detrital zircon (core) age histograms illustrating the district similarities between patterns obtained for the Koeris Formation of McClung (2006) and the Hotson (Gams) Formation of Cornell et al. (2009). The Wortel and Kouboom Subgroups (McClung, 2006) are included for comparison.

Detrital zircon (core) age histograms illustrating the district similaritie... Available to Purchase

Published: 01 December 2009
F ig . 3. Detrital zircon (core) age histograms illustrating the district similarities between patterns obtained for the Koeris Formation of McClung (2006) and the Hotson (Gams) Formation of Cornell et al. (2009) . The Wortel and Kouboom Subgroups ( McClung, 2006 ) are included for comparison.
Image
Geology of the Black Mountain (Swartberg) region (modified from Strydom et al., 1987). Section A-B illustrates the duplication of the Gams Formation (the host of stratified sulphide bodies) as a series of imbricate structures.

Geology of the Black Mountain (Swartberg) region (modified from Strydom et... Available to Purchase

Published: 01 December 2012
Figure. 8 Geology of the Black Mountain (Swartberg) region (modified from Strydom et al., 1987 ). Section A-B illustrates the duplication of the Gams Formation (the host of stratified sulphide bodies) as a series of imbricate structures.
Journal Article

Complex deposits in the Lo Gam structure, northeastern Vietnam: mineralogy, geochemistry, and formation conditions Available to Purchase

Tran Tuan Anh, I.V. Gas’kov, Tran Trong Hoa, P.A. Nevol’ko, Pham Thi Dung, Pham Ngoc Can
Published: 01 July 2012
Russ. Geol. Geophys. (2012) 53 (7): 623–635.
DOI: https://doi.org/10.1016/j.rgg.2012.05.001
... at deposits in different districts of the Lo Gam structure revealed wide variations in trace elements, which distinguish them from typical stratiform deposits and indicate their specific formation conditions. High trace-element contents might be important in the mining of these deposits (Song et al., 1994...
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View PDF for article title, Complex deposits in the Lo <span class="search-highlight">Gam</span> structure, northeastern Vietnam: mineralogy, geochemistry, and <span class="search-highlight">formation</span> conditions
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Chemical characteristics of the amphibolite of the Koeris Formation at Gamsberg. (a) N-MORB-normalised trace-element diagram (Sun and McDonough, 1989); (b) N-MORB-normalised immobile trace-element diagram (Sun and McDonough, 1989).

Chemical characteristics of the amphibolite of the Koeris Formation at Gams... Available to Purchase

Published: 01 December 2022
Figure 6. Chemical characteristics of the amphibolite of the Koeris Formation at Gamsberg. ( a ) N-MORB-normalised trace-element diagram ( Sun and McDonough, 1989 ); ( b ) N-MORB-normalised immobile trace-element diagram ( Sun and McDonough, 1989 ).
Journal Article

A NEW CHRONOSTRATIGRAPHIC PARADIGM FOR THE AGE AND TECTONIC HISTORY OF THE MESOPROTEROZOIC BUSHMANLAND ORE DISTRICT, SOUTH AFRICA—A DISCUSSION Available to Purchase

C. R. McClung, J. Gutzmer, N. J. Beukes
Journal: Economic Geology
Published: 01 December 2009
Economic Geology (2009) 104 (8): 1277–1281.
DOI: https://doi.org/10.2113/gsecongeo.104.8.1277
...F ig . 3. Detrital zircon (core) age histograms illustrating the district similarities between patterns obtained for the Koeris Formation of McClung (2006) and the Hotson (Gams) Formation of Cornell et al. (2009) . The Wortel and Kouboom Subgroups ( McClung, 2006 ) are included for comparison. ...
FIGURES
View PDF for article title, A NEW CHRONOSTRATIGRAPHIC PARADIGM FOR THE AGE AND TECTONIC HISTORY OF THE MESOPROTEROZOIC BUSHMANLAND ORE DISTRICT, SOUTH AFRICA—A DISCUSSION
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Journal Article

Distribution and geochemical characteristics of barite and barium-rich rocks associated with the Broken Hill-type Gamsberg Zn-Pb deposit, Namaqua Province, South Africa Available to Purchase

M. Stalder, A. Rozendaal
Published: 01 March 2005
South African Journal of Geology (2005) 108 (1): 35–50.
DOI: https://doi.org/10.2113/108.1.35
...Figure 4. Schematic cross-sections through the Gams Formation. ( a ) Section through the base metal ore body at Gamsberg North. ( b ) Section through the barite body in the southeastern part of Gamsberg. The ore-equivalent schist pinches out as a pyritic quartz-sillimanite-muscovite schist...
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View PDF for article title, Distribution and geochemical characteristics of barite and barium-rich rocks associated with the Broken Hill-type Gamsberg Zn-Pb deposit, Namaqua Province, South Africa
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Stratigraphical features of the five recumbent fold nappes comprising the Aggeneys duplex structure. The thicknesses were measured in the exposed cores of the structures. In the interest of diagrammatic clarity, the positions of the sections have been omitted from the inset map in the lower left corner. The various formations of the Aggeneys Subgroup, of which two feature prominently in this diagram (Hotson and Koeris) have been described in detail by Praekelt and Schoch, 1997 and Praekelt et al., 1992. The Gams and Kouboom formations are regarded as members of the Hotson Formation in the detailed descriptions (op. cit.). Rozendaal (1978) suggested formation status for the Gams.

Stratigraphical features of the five recumbent fold nappes comprising the A... Available to Purchase

Published: 01 December 2002
in the lower left corner. The various formations of the Aggeneys Subgroup, of which two feature prominently in this diagram (Hotson and Koeris) have been described in detail by Praekelt and Schoch, 1997 and Praekelt et al. , 1992 . The Gams and Kouboom formations are regarded as members of the Hotson
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Sand body prediction of Shaximiao Formation no. 7 in central Sichuan using different models: (a) GAM, (b) RF, (c) SVM, and (d) BRT.

Sand body prediction of Shaximiao Formation no. 7 in central Sichuan using ... Available to Purchase

Published: 23 September 2024
Figure 8. Sand body prediction of Shaximiao Formation no. 7 in central Sichuan using different models: (a) GAM, (b) RF, (c) SVM, and (d) BRT.
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U-Pb concordia diagram for zircons from Koeris Formation amphibolite (sample Gams-4) from the Gamsberg inselberg.

U-Pb concordia diagram for zircons from Koeris Formation amphibolite (sampl... Available to Purchase

Published: 01 March 2007
Figure 14. U-Pb concordia diagram for zircons from Koeris Formation amphibolite (sample Gams-4) from the Gamsberg inselberg.
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Primaryfeatures preserved in the low strainpressure shadow ofthe Gamsberg sheathfold. (a) Boulder conglomerate with iron formation clasts which unconformably overlies the Gams Member (b) Amygdaloidal amphibolite from the top of the Koeris Formation, (c) Lava flow breccia in the amphibolite unit of the Koeris Formation, (d) Cross bedding in shallow water siliciclastic sediments ofthe same Formation.

Primaryfeatures preserved in the low strainpressure shadow ofthe Gamsberg s... Available to Purchase

Published: 01 March 2017
Figure 20. Primaryfeatures preserved in the low strainpressure shadow ofthe Gamsberg sheathfold. (a) Boulder conglomerate with iron formation clasts which unconformably overlies the Gams Member (b) Amygdaloidal amphibolite from the top of the Koeris Formation, (c) Lava flow breccia
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Diagrammatic representation of the lithostratigraphy of the Gams Iron Formation. The main part of Zn-Pb sulphide mineralization is hosted by the North Body, whereas iron formations are best developed by its lateral extensions (Overturned Limb). The graftonite-bearing iron formations are found towards the top of the C1 unit of the Overturned Limb.

Diagrammatic representation of the lithostratigraphy of the Gams Iron Forma... Available to Purchase

Published: 01 December 2002
F ig . 2. Diagrammatic representation of the lithostratigraphy of the Gams Iron Formation. The main part of Zn-Pb sulphide mineralization is hosted by the North Body, whereas iron formations are best developed by its lateral extensions (Overturned Limb). The graftonite-bearing iron formations
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Figure 12.

(a) The Gamsberg zinc deposit is the type area of the Gams Member, its dis... Available to Purchase

Published: 01 March 2017
Figure 12. (a) The Gamsberg zinc deposit is the type area of the Gams Member, its distribution is shown in a simplified geological map of the Gamsberg basin. The position ofthe main ore bodies are indicated as well as the perimeters ofthe planned open cast mine ( Table 1 ). (b) Verticaland
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Variation of gammacerane/C24 tetracyclic terpane (Tet) with gammacerane/αβ C30 hopane (Gam/αβ C30 H) for source-rock samples from the Bozhong subbasin, Bohai Bay basin. E2s1+2 = first and second members of the Shahejie Formation; E2s3 = third member of the Shahejie Formation; E3d3 = third member of the Dongying Formation.

Variation of gammacerane/C 24 tetracyclic terpane (Tet) with gammacerane/α... Available to Purchase

Published: 01 March 2017
Figure 16. Variation of gammacerane/C 24 tetracyclic terpane (Tet) with gammacerane/αβ C 30 hopane (Gam/αβ C 30 H) for source-rock samples from the Bozhong subbasin, Bohai Bay basin. E 2 s 1+2 = first and second members of the Shahejie Formation; E 2 s 3 = third member of the Shahejie