Black dimensional stones: geology, technical properties and …

The prices for black dimensional stones on the international market vary from 900 to 2,400 US$/m 3, whereas the Uruguayan dolerites are priced at 900 to 1,700 US$/m 3.Dolerites from China have prices ranging from 1,000 to 2,000 US$/m 3, the South African gabbro/norite shows prices up to 2,000 US$/m 3 and the most expensive black stone is …

A review of the resistivity structure of the Karoo Supergroup, …

Detailed investigations, such as the one in the De Aar area, show that the average percentage of dolerite in the dolerite bearing layer of zone 2 is 45% with a high of 85% and a low of about 10%.

The iron-titanium oxide mineralogy of Karoo dolerite in …

THE IRON-TITANIUM OXIDE MINERALOGY OF KAROO DOLERITE IN THE EASTERN CAPE AND SOUTHERN ORANGE FREE STATE by LM. REYNOLDS ABSTRACT …

Occurrence and origin of ring-shaped dolerite outcrops …

OCCURRENCE AND ORIGIN OF RING-SHAPED DOLERITE OUTCROPS IN THE EASTERN CAPE PROVINCE AND WESTERN TRANSKEI by A. F. MEYBOOM and R. …

Morpho-tectonics and mechanism of emplacement of …

also a prominent trend in Namaqualand (De Beer, pers. comm., 1998) and is also found in the Cape Peninsula, although the age is much younger (130 Ma, Reid et at., 1991). Some of these dykes (like the Middelburg dyke) link onto the Eastern Cape east-west mega feeders. The general Karoo dyke pattern over South Africa is simi­

Morpho-tectonics and mechanism of emplacement of …

The distribution of dolerite dykes in the western Karoo (Fig­ ure 1) was compiled from examination of aerial photography and satellite imagery, correlation with existing …

Diabase or Dolerite : Properties, Composition, Formation

Diabase, also known as dolerite, is a type of igneous rock that holds significance in the field of geology due to its unique characteristics and formation process. It is an intrusive rock, which means it forms from molten magma that cools and solidifies beneath the Earth's surface. Diabase is often confused with basalt due to their similar …

Etude de faisabilité pour la création d'une carrière de …

Aucun effet cumulé avec l'activité de la carrière n'est à prévoir en fonction des autres projets présents à proximité de la carrière de l'Avenir des Vasières. 2.4. Présentation des zones pressenties et justification environnementale du choix retenu A la suite de modélisation SIG, deux zones ont été dégagées.

An Integrated Geophysical Approach to Mapping and …

An Integrated Geophysical Approach to Mapping and Modelling the Karoo Dolerite Intrusions in the South-Eastern Karoo Basin of South Africa. Christopher Baiyegunhi 1, Oswald Gwavava 1, ... Eastern Cape, South Africa. November 4-11, 2018 – 2018 AAPG International Conference and Exhibition, Cape Town, South Africa. Posted: …

Aggregates, Concrete Stone, Road Stone, Sand, Gabion

The Aggregates division produces aggregates of a wide variety of sizes and technical specifications, primarily with products including stone, gravel and sand that are used for large-scale civil engineering and infrastructure projects. Afrimat's proprietary commercial quarries – located in across South Africa – also supply the majority of ...

Calvaire du tertre

Calvaire du tertre. En flanc sud du sommet du tertre et de la carrière de dolérite, cette croix monumentale fut édifiée en 1891 en souvenir de la Mission qui dura trois semaines en novembre de la même année, sur socle à triple emmarchement et piédestal portant l'inscription : MISSION 1891 - O CRUX AVE - VENEL, MACE vicaires - Me LEMARIE ...

Geochemistry of dolerite intrusions of the southeastern

New U-Pb age determinations of pegmatitic pods from Karoo LIP dolerite sills into the Ecca Group of the Karoo Basin yield single crystal dates with uncertainties …

(PDF) Hydrogeology of fractured-rock aquifers and

PDF | On Feb 1, 2004, Lesley Anne Gibson and others published Hydrogeology of fractured-rock aquifers and related ecosystems within the Qoqodala dolerite ring and sill complex, Great Kei Catchment ...

Contact Metamorphism of Black Shales in the Thermal …

Rowsell and de Swart were the first to demonstrate the destructive influence that Karoo dolerite intrusions had on the organic maturation of Karoo shales, using vitrinite reflectance and illite crystallinity measurements (e.g., Wang and Manga 2015).More recently, contact metamorphism of organic-rich shales of the Karoo Basin surrounding …

Fracturing of doleritic intrusions and associated contact …

Extensive drilling and injection tests (12 wells) across an inclined dolerite sheet at Qoqodala in the Eastern Cape province confirmed this fact, highlighting how the igneous body itself forms a barrier to fluid flow, whereas the intensely fractured lower dolerite–host rock interface channels groundwater flow along the contact (Chevallier et ...

Karoo dolerites, Cradock, Inxuba Yethemba Local …

The dolerites in the Cradock district of the Eastern Cape are somewhat famous for two reasons. Firstly, some contain gold, silver and copper mineralization associated with …

What is Dolerite, Properties, and Geological significance

Hardness: Dolerite has a moderate hardness, with a Mohs hardness rating of 5.5 to 6. Specific Gravity: The specific gravity of doler ize is 2.6 to 2.8. Luster: Dolerite has a vitreous luster, which means it has a glassy appearance. Fracture: Dolerite has a conchoidal fracture, which is a characteristic of igneous rocks.

Decoupling of isotopes between magmatic zircons and

The Jiabang dolerite has low SiO 2 of 47.6 – 54.2 wt%, high MgO of 4.93 ... Neoproterozoic volcanoclastic sequences and intrusive rocks are widely distributed in the western, northern and eastern parts of the Yangtze Block, as well as the Cathaysia Block (Fig. 1), mainly interpreted as products during the assembly and breakup of the Rodinia ...

Hydrogeology of Fractured-Rock Aquifers and Related …

To assess the occurrence of groundwater associated with the Qoqodala dolerite rings and sills in the Eastern Cape area using: Morphological and tectonic 3D analysis; …

Geology

The Garden is located on the Bokkeveld Plateau, 730 m above sea level and the vegetation is closely associated with the geology of the area. The oldest rocks are the shale beds of the Malmesbury System, through which one passes on the ascent of the escarpment at Van Rhyn's Pass or Botterkloof. Above these lie the sandstone beds of the Cape ...

Dolerite, the Karoo's Fracking Game-Changer

(PDF) Development of a conceptual geohydrological …

The weighted annual δD values of precipitation at UCT and Cape Town International Airport are similar (-11.9 and -12.7‰, respectively), whereas the δ 18O values show slight but significant ...

Geochemistry of a continental tholeiite suite: late Palaeozoic …

Geochemistry of Karroo dolerite sills in the Calvinia district, Western Cape Province, South Africa. CONTRIB MINERAL PETROL 66, 351 –60.CrossRef Google Scholar. ... Rare-earth abundances in Mesozoic dolerite dykes from Eastern United States. In Brunfelt, A. O. & Steinnes, E. (eds) Activation Analysis in Geochemistry and …

Age and correlation of the False Bay dolerite dyke swarm, south-western

Potassium-argon dates of four dykes from the False Bay dolerite swarm yield a mean age of emplacement of 132 ±6 Ma. Dykes included within this particular swarm display coherent geochemical patterns that can serve to distinguish them from other swarms related to the older Cape Granite suite and the younger alkaline intrusions (such …

GC58TB1 MZP Dolerite (Earthcache) in Eastern Cape, South …

MZP Dolerite (GC58TB1) was created by iPajero on 7/13/2014. It's a Other size geocache, with difficulty of 2.5, terrain of 1.5. It's located in Eastern Cape, South Africa.Ever been to the Mountain Zebra Park and wondered what rock forms these huge rounded sheets or domes? This earth cache aims to enlighten you.

Pillars at the bottom of the world [Australia] • Exploring …

The coastline of southern Tasman Peninsula is composed by giant dolerite sea columns that protrude up to 300 metres from the sea. The distinct elongated shape are the property of the dolerite; a mafic (i.e. oceanic) rock that intruded beneath the surface of the earth as sill (parallel to the bed) or as dykes (across the bedding planes).

WESSA

Stellenryck have published the draft EIA for the proposed dolerite mine at Kei Mouth. We have until 5 Nov to submit comments

Detection of aquifers above and below dolerite sills: A …

Request PDF | On Jan 1, 2003, V. Hall-Zadorozhnaya and others published Detection of aquifers above and below dolerite sills: A successful application of TDEM in the Eastern Cape | Find, read ...

Detection of aquifers above and below dolerite sills: A …

Time-Domain Electro-Magnetic soundings (TDEM) were carried out in the Qoqodala area of Eastern Cape with the aim to detect deep-seated structures in excess of 350 meters, which could contain water-bearing sediments, as well as at a general identification of the borders between dolerite sills and surrounding sediments.

Wild Coast: Hole in the Wall, Eastern Cape, South …

Hole in the Wall, at the mouth of the Mpako River, is one of the most recognisable geological formations on Southern Africa's coast. ©Roger de la Harpe. The huge rock formation, with cliffs that drop into the sea, has …

Geochemistry of dolerite intrusions of the southeastern Main …

Here, we present results from the research borehole KWV-01 drilled in the Eastern Cape Province of South Africa. The intersected succession, spanning the …

Multistage Evolution of Dolerites in the Karoo Large Igneous …

Galerne et al. (2008) recently presented major and trace element data on 327 samples from sills and dykes exposed within a restricted area in the Karoo Basin, the Golden Valley Sill Complex (GVSC; Figs 1 and 2).The aim of that paper was to test geochemical similarities or differences between sills and dykes in the Golden Valley Sill …

GC58RRP Dolerite Egg Rock (Earthcache) in Eastern Cape, …

Dolerite Egg Rock (GC58RRP) was created by iPajero on 7/13/2014. It's a Other size geocache, with difficulty of 2, terrain of 2.5. It's located in Eastern Cape, South Africa.We were brought to this spot to do the nearby cache GC4XQ1Y Egg Rock/Eierklip and immediately thought to create an earth cache due to the nature of this rock and the ...

Études De Lithostabilisation De La Latérite Avec La …

Tambacounda (sudest du Sénégal) et traité par ajout de concassé de dolérite - a été étudié. Les résultats de ces études sont présentés dans ce qui suit. 2. Études de lithostabilisation de la latérite avec la dolérite de Mansadala (Sénégal) pour une utilisation en couche de base de chaussée 2.1.

Hydrogeology of Fractured-Rock Aquifers and Related …

The study area, i.e. the Qoqodala ring system is situated within the Great Kei river catchment, in the Eastern Cape. It covers four 1: 50 000 sheets and includes Queenstown. In these Eastern Karoo regions, precipitations are higher than in the Western Karoo, runoff is more important and a large part of the population depends on the numerous ...

Karoo dolerites, Cradock, Inxuba Yethemba Local …

The dolerites in the Cradock district of the Eastern Cape are somewhat famous for two reasons. Firstly, some contain gold, silver and copper mineralization associated with secondary prehnite that occurs with the dolerite. A few of these gold occurrences were exploited during the late 19th and early 20th centuries.

Paleomagnetism and Rock Magnetism of Permian

The KWV-1 borehole was drilled in August 2015, 10 km east of Willowvale town in Eastern Cape Province. Although very little information existed on the nature of the stratigraphic succession at the site (nearest reference section is some 100 km away), the area is known to contain abundant dolerite sills.

A Complete Guide to South Africa's Eastern Cape | Rhino …

Geography in South Africa. The Eastern Cape is a South African province which was formed in 1994 out of the Xhosa homelands together with the eastern portion of the Cape Province. It's located in the south-east of the country and gets progressively wetter from east to west. One of the province's greatest traits is that it is home to all ...

Petrographical and geophysical investigation of …

The outcrop of the Ecca Group in the Eastern Cape Province was investigated in order to reveal petrographic and geophysical characteristics of the formations that make up the group which are vital information …