dolomite in soutern africa geology

Rehabilitation of sinkholes and subsidences on Dolomitic ...

In South Africa most sinkholes and subsidences have been recorded on dolomite of the Malmani Subgroup of the Chuniespoort Group on the Far West Rand and in an area south of Pretoria within the City of Tshwane, with numerous studies done on the occurrence of sinkholes and subsidences in these two areas.Post Gondwana African land surface and ... - …1999-3-1 · Original sedimentary bedding in the dolomite is partly preserved in the saprolite, although mass balance calculations suggest that the saprolite has undergone 60 to 70% compaction in the transformation of dolomite to wad. Carbonaceous chloritic shale beds interbedded with the Oaktree dolomite are altered to kaolinitic clays in the saprolite.

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Construction on dolomite in south Africa

Damage to structures and loss of life have been more severe on dolomite than on any other geological formation in southern Africa. The subsidence that occurs on dolomitic terrain following development or during dewatering has given dolomite a notorious reputation and engineers and geologists became reluctant to recommend development on the material.2 Geo-environmental setting of dolomite2020-10-21 · The dolomite within South Africa is seen as one of the earliest carbonate platform successions on earth (Beukes, 1987; Alterman and Wotherspoon, 1995), and has been dated at 2550 ± 3 Ma (Walraven and Martini, 1995). 2.2.2 Weathering and dissolution Due to the composition of dolomite, it is soluble in an acid. The following is an example of

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Dolomites | Geological history made in South Tyrol

241 million years ago: the beginning of a new world. Life began to change completely. In rapid succession, new plants and new animals were modified, separated and formed new species and new genera. The supercontinent of …CHARACTERISATION OF THE DEEP AQUIFERS OF SOUTH …2021-9-1 · 2.1.8 Deep Groundwater in South Africa 14 2.1.8.1 Introduction to Underlying Geology and Hydrogeology 14 2.1.9 Case Studies from South Africa 17 2.1.9.1 Surface and Groundwater Interaction in Johannesburg 17 2.1.9.2 Dolomite Karst Aquifers of the West Rand 19 2.1.9.3 Groundwater in the Bushveld Complex 20

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THE GEOLOGY OF THE MALMANI DOLOMITE …

2021-3-26 · THE GEOLOGY OF THE MALMAN I DOLOMITE SUBGROUP___[N THE CARLETONVILLE AREA, TRANSVAAL ABSTRACT This study involves the stratigraphic analysis of the Malmani Dolomite Subgroup, using subsurface data, in the Carletonvi1le area, Transvaal, Republic of South Africa. These dolomite rocks form part ofEnvironmental geological aspects of the dolomites of …The dolomite rocks in South Africa coincide for the most part with the so-called Pretoria-Witwatersrand-Vereeniging complex which comprises the industrial heart of the country. Urban development will, therefore, also be concentrated in this area, with the inevitable establishment of townships on the dolomite. This development has great impact on the dolomitic environment …

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THE GEOLOGY

2010-7-5 · South Africa, that which separates the basins of the Vaal and the ... geological elements of which the area is composed. The broad belt of elevated country which constitutes the 7itwatersrand, or briefly the" Rand," forms, indeed, the dominant ... To the south and south-west beyond the broad dolomitePost Gondwana African land surfaces and pedogenetic ...2021-3-27 · Box 524, Auckland Park, 2006 Republic of South Africa Email: [email protected] Accepted 18 November 1998 Abstract - Several supergene ferromanganese wad deposits, mined on small scale for industrial applications, are devel­ oped on dolomite of the Neoarchaean Malmani Subgroup of the Transvaal Supergroup in South Africa. At the West Wits

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A performance based approach to dolomite risk …

2016-6-17 · Current approach to risk mitigation on dolomite land in South Africa Key concepts The method for dolomite land hazard assessment in South Africa, which was developed by Buttrick et al. (2001) and which is commonly applied in South Africa, is now built around three fundamental concepts, namely, hazard, inherent hazard and hazard rating.THE GEOLOGY - resources.bgs.ac.uk2010-7-5 · South Africa, that which separates the basins of the Vaal and the ... geological elements of which the area is composed. The broad belt of elevated country which constitutes the 7itwatersrand, or briefly the" Rand," forms, indeed, the dominant ... To the south and south-west beyond the broad dolomite

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Construction upon dolomites of the South-Western …

Some 15 000 km2 of the Transvaal Province of South Africa are underlain by soluble dolomite rocks. The south-western part of the Province contains some of the world''s largest gold mines. Development and operation of these mines has affected performance of surface structures through groundwater lowering in soil covered areas underlain by cavernous dolomite.The …THE GEOLOGY OF THE MALMANI DOLOMITE …2016-6-15 · THE GEOLOGY OF THE MALMAN I DOLOMITE SUBGROUP___[N THE CARLETONVILLE AREA, TRANSVAAL ABSTRACT This study involves the stratigraphic analysis of the Malmani Dolomite Subgroup, using subsurface data, in the Carletonvi1le area, Transvaal, Republic of South Africa. These dolomite rocks form part of

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(PDF) Construction on dolomite in south Africa

Sinkholes can occur on land underlain by dolomite and cause substantial damage to buildings and even loss of life. More than four million people work or …The geology of an area south of Pretoria with specific ...2014-12-10 · The geology of an area south of Pretoria with specific reference to dolomite stability . by . ... South Africa, and to interrogate the current method of dolomite stability analysis. The study area is located partly on the Lyttelton and Eccles Formations, Malmani Subgroup, Chuniespoort Group, of the ...

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Hazard of sinkhole formation TECHNICAL PAPER in the ...

2015-7-29 · Keywords: dolomite, sinkhole, hazard, Scenario Supposition, Centurion INTRODUCTION The greater part of land in the area directly south of Pretoria is underlain by dolomite from the Chuniespoort Group of the Transvaal Supergroup. In South Africa dolomite rock has a notorious reputation for the formation of sinkholes and subsidences.Post Gondwana African land surface and ... - …1999-3-1 · Original sedimentary bedding in the dolomite is partly preserved in the saprolite, although mass balance calculations suggest that the saprolite has undergone 60 to 70% compaction in the transformation of dolomite to wad. Carbonaceous chloritic shale beds interbedded with the Oaktree dolomite are altered to kaolinitic clays in the saprolite.

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Construction on dolomite in south Africa

Damage to structures and loss of life have been more severe on dolomite than on any other geological formation in southern Africa. The subsidence that occurs on dolomitic terrain following development or during dewatering has given dolomite a notorious reputation and engineers and geologists became reluctant to recommend development on the material.THE GEOLOGY OF THE MALMANI DOLOMITE …2021-3-26 · THE GEOLOGY OF THE MALMAN I DOLOMITE SUBGROUP___[N THE CARLETONVILLE AREA, TRANSVAAL ABSTRACT This study involves the stratigraphic analysis of the Malmani Dolomite Subgroup, using subsurface data, in the Carletonvi1le area, Transvaal, Republic of South Africa. These dolomite rocks form part of

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Construction upon dolomites of the South-Western …

Some 15 000 km2 of the Transvaal Province of South Africa are underlain by soluble dolomite rocks. The south-western part of the Province contains some of the world''s largest gold mines. Development and operation of these mines has affected performance of surface structures through groundwater lowering in soil covered areas underlain by cavernous dolomite.The …The Numerical Study of Dolomite Sinkholes in Centurion ...2020-12-8 · acquired along the Gautrain route through Centurion, South Africa. Sinkhole development was analysed through analytical theories and the application of numerical methods. The analytical study conceptualized the ''angle of draw'' of dolomite overburden layers into cavities, with Terzaghi''s arching in soil equation.

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Environmental geological aspects of the dolomites of South ...

(PDF) Construction on dolomite in south AfricaEnvironmental geological aspects of the dolomites of …1993-1-1 · Journal of African Earth Sciences, Vol. 16, No. 1/2, pp. 53-61, 1993. 0899-5362/93 $6.00+0.00 Printed in Great Britain 1993 Pergamon Press Ltd Environmental geological aspects of the dolomites of South Africa D. B. Btrrrvdcx, J. L. VAN Root* and R. LIGTHELM* Engineering Geological Environmental Services, Rivonia, Johannesburg, R. S. A. *Department of Geology, …

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Environmental geological aspects of the dolomites of …

The dolomite rocks in South Africa coincide for the most part with the so-called Pretoria-Witwatersrand-Vereeniging complex which comprises the industrial heart of the country. Urban development will, therefore, also be concentrated in this area, with the inevitable establishment of townships on the dolomite nstruction on dolomite in south Africa | SpringerLinkDamage to structures and loss of life have been more severe on dolomite than on any other geological formation in southern Africa. The subsidence that occurs on dolomitic terrain following development or during dewatering has given dolomite a notorious reputation and engineers and geologists became reluctant to recommend development on the material.This has led to the …

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(1) The Ore Deposits of South Africa (2) The Geology of ...

(1) THE second part of Mr, Johnson''s "Ore Deposits of South Africa," of which the first part was reviewed in NATURE, June 3, 1909, vol. Ixxx., p. 395, deals with the goldfields of the Transvaal.Geological Formation of South AfricaThe original source of these gold particles, however, remains something of a geological mystery. Around 2.7 billion years ago, the Kaapvaal Craton collided with the Zimbabwe craton to the north. This created a mammoth mountain range …

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2 Geo-environmental setting of dolomite

2020-10-21 · The dolomite within South Africa is seen as one of the earliest carbonate platform successions on earth (Beukes, 1987; Alterman and Wotherspoon, 1995), and has been dated at 2550 ± 3 Ma (Walraven and Martini, 1995). 2.2.2 Weathering and dissolution Due to the composition of dolomite, it is soluble in an acid. The following is an example ofConstruction on dolomite in south Africa - NASA/ADSDamage to structures and loss of life have been more severe on dolomite than on any other geological formation in southern Africa. The subsidence that occurs on dolomitic terrain following development or during dewatering has given dolomite a notorious reputation and engineers and geologists became reluctant to recommend development on the material.

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The Occurrence of Dolomite in South Africa | Journal of ...

Mr. W. H. Penning, F.G.S., examined a certain rock near Lydenburg, when in company with Mr. A. C. Crutwell, and they described it in the Quart. Journ. Geol. Soc. vol. xli. (1885) p. 576, as "a peculiar blue, fine-grained, calcareo-siliceous rock." This they named "''chalcedolite,'' in consequence of the chalcedonic texture frequently displayed-indeed, some portions of the …Environmental geological aspects of the dolomites of …The dolomite rocks in South Africa coincide for the most part with the so-called Pretoria-Witwatersrand-Vereeniging complex which comprises the industrial heart of the country. Urban development will, therefore, also be concentrated in this area, with the inevitable establishment of townships on the dolomite. This development has great impact on the dolomitic environment …

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Integration of a Dolomite Risk Management Programme in ...

2016-6-16 · Dolomite is a world-wide phenomenon and South Africa seems to be ahead of its counterparts in terms of the management of development on dolomite land [2] [6] . Although the inherent character as well as the effect of development on dolomite is well-known and researched, the pro-active risk management of development on dolomite is encountered ...Dolomite Mineral | Uses and Properties - GeologyDolomite is a common rock-forming mineral. It is a calcium magnesium carbonate with a chemical composition of CaMg (CO 3) 2. It is the primary component of the sedimentary rock known as dolostone and the metamorphic rock known as …

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SANSA

2019-9-17 · South African Geology The Bushveld Igneous Complex is an area rich in platinum-group metals in the Gauteng, Mpumalanga and the North West provinces. It has the worlds largest reserves of platinum-group metals. Legend Simplified geology of South Africa, courtesy of the Council for Geoscience (CGS), South Africa. Council for Geoscience websiteGeological Formation of South AfricaThe original source of these gold particles, however, remains something of a geological mystery. Around 2.7 billion years ago, the Kaapvaal Craton collided with the Zimbabwe craton to the north. This created a mammoth mountain range …

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Geotechnical, Dolomite, Boreholes, Drilling, DPSH, Geology

Thoka Geosciences cc is a progressive multi-diciplinary firm specialising in a wide range of services in Engineering Geology applications, Civil Engineering, Construction, Mining, Plant Hire, Geohydrological Investigations and Borehole …Prof J. Louis van Rooy | Article - University of Pretoria2022-2-13 · 1985 – 2005: Senior Lecturer in Engineering Geology, University of Pretoria, South Africa 2000 – present: Part-time consultant servicing town and regional planners, civil engineers and the community on issues related to …

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A Guideline for the Assessment, Planning and ...

2007-5-29 · 1 DESCRIPTION OF THE DOLOMITIC RESOURCE IN SOUTH AFRICA Karst aquifers, specifically in dolomite rock, represent South Africa''s single largest and most important aquifer type (an explanation of "karst" is given in Section 1.4). Dolomite aquifers store large volumes of water, support numerous springs andTHE GEOLOGY - resources.bgs.ac.uk2010-7-5 · South Africa, that which separates the basins of the Vaal and the ... geological elements of which the area is composed. The broad belt of elevated country which constitutes the 7itwatersrand, or briefly the" Rand," forms, indeed, the dominant ... To the south and south-west beyond the broad dolomite

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Formation of modern dolomite in hypersaline pans of the ...

2011-4-5 · Authigenic calcite and dolomite and biogenic aragonite occur in Holocene pan sediments in a Mediterranean-type climate on the western coastal plain of South Africa. Sediment was analysed from a Late Pleistocene coastal pan at Yzerfontein and four Holocene inland pans ranging from brackish to hypersaline.Zimbiwa Dolomite, South Africa - miningweekly 2003-11-21 · Geology: Montichristo. Major infrastructure and equipment: Crushing and screening plants and rolling stock for materials-handling. Run-of-mine dolomite is delivered to a 450 t/h primary crushing ...

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Dolomite Guideline

2010-4-30 · Dolomite is a single mineral consisting of the chemical combination of calcium and mag-nesium carbonate (CaMg(CO 3) 2). The rock In South Africa the word ''Dolomite'', where it denotes the rock type, has substituted the word ''Dolomitic Limestone''. Dolomitic Limestone, as a natural rock, consists of the mineral dolomite (CaMg(CO 3) 2Environmental geological aspects of the dolomites of …The dolomite rocks in South Africa coincide for the most part with the so-called Pretoria-Witwatersrand-Vereeniging complex which comprises the industrial heart of the country. Urban development will, therefore, also be concentrated in this area, with the inevitable establishment of townships on the dolomite. This development has great impact on the dolomitic environment …

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