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1 edition of Classification of Witwatersrand quartzites, by J.D.M. Law [and others] found in the catalog.

Classification of Witwatersrand quartzites, by J.D.M. Law [and others]

Classification of Witwatersrand quartzites, by J.D.M. Law [and others]

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Published by University of the Witwatersrand in Johannesburg .
Written in English

    Subjects:
  • Quartzite - South Africa

  • Edition Notes

    11

    ContributionsLaw, J.D.M.
    The Physical Object
    Pagination16 p.
    Number of Pages16
    ID Numbers
    Open LibraryOL22061924M

    Quartz Arenite. A sandstone consisting of at least 95% are thought to attain this very high quartz content because they have been "recycled." During the first depositional cycle, they were deposited as impure sands containing quartz, feldspars, micas, and other , in the second cycle, the additional transport and weathering destroyed what remained of the less durable. Quart definition, a unit of liquid measure of capacity, equal to one fourth of a gallon, or cubic inches ( liter) in the U.S. and cubic inches ( liters) in Great Britain. See more.


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Classification of Witwatersrand quartzites, by J.D.M. Law [and others] Download PDF EPUB FB2

J.D.M. Law; View. Giant Mesoarchean crustal gold-enrichment episode: possible causes and consequences for exploration Reconstructive approach to the classification of Witwatersrand "quartzites. Different types of quartzites were selected from rock outcrops of the Togo Structural Unit in Pokuasi (5°41'0"N, 0°16'36"E) in the Greater Accra region of Ghana and differentiated by physical examination.

The Togo Structural Unit consists of other rocks such as phyllite, mica schist and chert and stretches from Senya Breku. Quartzites are not necessarily metamorphic; many are sedimentary and represent sandstones that have been subjected to cementation by secondary silica, compaction through pressure- solution of the quartz grains, or other nonmetamorphic processes, The mechanisms of formation of the sedimentary quartzites are discussed and it is proposed that Classification of Witwatersrand quartzites term pressolved quartzite be Classification of Witwatersrand quartzites to by:   Large temperature varia- tions between gold fields are not indicated by the present muscovite data, but more analyses from 24 N I Phillips, J.D.M.

Law / Ore Geology Reviews 9 () the Witwatersrand area would be needed to test if the Central and West Rand represent statisti- cally higher temperature conditions than other gold by: Quartzites are known to have strength characteristics which are not uniform and as such vary from low to high depending on their metamorphic research provides some Engineering Geological characteristics of quartzite types used for concrete works in parts of Southern Ghana and offers a classification of quartzites for easy field Cited by: 1.

Read Volume 93 Issue 1 of South African Journal of Geology. The nature of the Archaean basement in the hinterland of the Witwatersrand Basin; II, A crustal profile west of the Welkom Goldfield and comparisons with the Vredefort crustal profile. Law JDM, Bailey AC, Cadle AB, Phillips GN, Stanistreet IG () Reconstructive approach to the classification of Witwatersrand ‘quartzites’.

S Afr J Geol –92 Google Scholar Manzi MSD, Hein KAA, King N, Durrheim RJ () Neoarchaean tectonic history of the Witwatersrand Basin and Ventersdorp Supergroup: new constraints from high.

Most other minerals, however, can not tolerate high temperature and pressure as well. Hence, impure sandstones may give rise to quartzites that contain minerals like mica, sillimanite, kyanite (metamorphosed clay minerals), pyroxenes and amphiboles like diopside and tremolite (metamorphosed dolomite plus silica from sandstone), and even.

A.B. Cadle's 13 research works with citations and 3, reads, including: The Karoo Basin of South Africa: type basin for the coal-bearing deposits of southern Africa.

Additional minerals carried by groundwater can impart hues of green, blue, or iron-red. Van Gogh and Azul Macaubas quartzites are examples of vivid coloring. Regardless of color, quartzite is made of one thing: quartz. That’s helpful because quartz has distinct properties that make it easy to tell apart from other minerals.

Phillips G N, Law J D M, Myers R E - The role of fluids in the evolution of the Witwatersrand Basin: in S. Afr. Geol. v93, no. 1 pp ; Phillips G N, Myers R E - The Witwatersrand Gold Fields: Part II. An origin for Witwatersrand gold during metamorphism and associated alteration: in Econ.

Geol. Mono. 6 pp The current concepts concerning the genesis of the unique ore-bearing reefs of the Witwatersrand Basin and its gold resource potential are considered. The results of microscopic examination of ore from the Black, Ventersdorp Contact, Carbon Leader, and Vaal reefs, as well as of thermobarometric study of quartz, are presented.

A model of synsedimentation hydrothermal origin of the reefs in the. These stones contain some quartzite, along with other minerals and rock types. In general mixed stone quartzites are darker in color than regular quartzites, and they have swirls and blobs of different rock types blended together.

The table below outlines the 5 types of sandstone and quartzite. Ways to distinguish sandstone and quartzite. U, Th, Au and Pt in QPC and quartzites. QPC and quartzites samples have been analyzed using ICP-MS for uranium and thorium.

Radioactive QPC indicate U from – ppm, Th from 5– ppm, whereas in quartzites U varies from to 19 ppm and Th varies from to 35 ppm. Au values in QPC show variation from. Quartzites are snowy white, less often pink or gray; they commonly have a fine angular jointing and break up into rubble under frost action.

They yield a thin and very barren soil and, because they weather slowly, tend to project as hills or mountain masses. Many prominent ridges in the Appalachian Mountains are composed of highly resistant tilted beds of quartzite.

The ‘hot spot’ near Bristol, New Hampshire was an area of high fluid flow during metamorphism. In order to determine the mechanisms of fluid flow through the area, we made a detailed study of the δ 18 O values of quartz from an outcrop of interlayered quartzites and schists.

Results indicate that the permeability of the quartzite was very low in comparison to that of the schist. Things to know about quartzite: it is an increasingly popular choice among homeowners and interior designers.

Its sophisticated good looks combined with crystalline sparkle, durability, earth-toned colors and stylish appearance make it a top trend contender for everything from kitchen countertops to feature walls. penetration twins on the Dauphine law, about [], and the Brazil law, with fg as contact plane; contact twins on the Japan law, with fg as contact plane, may be repeated; and several other laws.

Physical Properties: Cleavage: Rarely observable, poor on fg, fg, fg, some others; rhombohedral parting. Fracture: Conchoidal.

An illustration of an open book. Books. An illustration of two cells of a film strip. Video. An illustration of an audio speaker.

Audio. An illustration of a " floppy disk. Software. An illustration of two photographs. Images. An illustration of a heart See other formats. Bas den Brok, Jörg Meinecke, Klaus Röller, Fourier transform IR‐determination of intragranular water content in quartzites experimentally deformed with and without added water in the ductile deformation field, Journal of Geophysical Research: Solid Earth, /94JB, 99.

enrichment of quartzites by a complex of mechanical, chemical, thermal and other methods should be. performed. Highly pure fine-grained Antonovsk quartzites, slightly containing harmful structural impurities, could be easily enriched in contrast to monocrystalline raw materials which that require special purification in alloy.

Quartzite is a stunning natural stone that is often seen as a viable alternative to marble. The two stones are frequently compared because of the veining and colors present in many types of quartzite, which make it resemble the look of marble.

quartzites are examples of vivid coloring. Regardless of color, quartzite is made primarily of one thing: quartz.

That’s helpful because the hardness and acid resistance of quartz set it apart from the minerals in marble. (Note – The mineral quartz should not be confused with the brands of manufactured countertop materials commonly.

Quartzite Crystal Quartzites are metamorphosed sandstones and will scratch glass. Classification: Non-Foliated Texture: coarse grained Major mineral: quartz. Quartzite Under a Microscope: A specimen of the Bo Quartzite collected near South Troms, Norway, observed through a microscope in thin-section under cross-polarized light.

The quartz grains in this view range in color from white to gray to black, and they form a tight interlocking network. All quartzites are different in terms of porosity and stain resistance, and some are more stain-resistant than others.

They are not stain proof, but most are incredibly stain resistant. To help explain, let’s take a trip back to your early Earth Science class. Quartzite Countertop Crush. Designers are crushing over quartzite, and we aren’t the least surprised.

Quartzite is heat resistant, doesn’t scratch or etch like some surfaces can, and being a natural product each slab offers exquisite one-of-a-kind looks to give your countertop a personal signature. Quartzite is a hard, non-foliated metamorphic rock which was originally pure quartz sandstone.

Sandstone is converted into quartzite through heating and pressure usually related to tectonic compression within orogenic quartzite is usually white to grey, though quartzites often occur in various shades of pink and red due to varying amounts of iron oxide (Fe 2 O 3).

Distinction from Other Rocks. Quartzites, which are very homogeneous appearing rocks, may be confused, in the outcrop or hand specimen, with some limestones or felsites of a similar color and texture.

From the former they are easily told by a test of the hardness, or by lack of effervescence with acid; from the latter, in the field by the.

A metamorphic rock consisting largely or entirely of quartz. Most quartzites are formed by metamorphism of sandstone; but some have developed by metasomatic introduction of quartz, SiO 2, often accompanied by other chemical elements, for example, metals and sulfur (ore quartzites).The geological relations and the shape of quartzite bodies serve to distinguish between them (see illustration).

Quartzite. Quartzite. Quartzite (from German: Quarzit) is a hard, non-foliated metamorphic rock which was originally pure quartz one is converted into quartzite through heating and pressure usually related to tectonic compression within orogenic quartzite is usually white to grey, though quartzites often occur in various shades of pink and red due to varying amounts.

Secondary-quartzites are associated with volcanic and subvolcanic rocks of rhyolitic to andesitic composition. Normally they form as replacements of acid igneous rocks and more rarely of sedimentary rocks.

They may host mineral deposits of alunite, pyrophyllite, Au, Cu, Sb and Hg. Abstract A review of past terminology and previous petrological studies suggests that quartzite should be classified descriptively as both a sedimentary and a metamorphic rock.

Quartzite is identified in the field as a quartz‐rich rock (exclusive of chert and vein quartz) that is exceptionally hard and, when broken by a rock hammer, fractures irregularly through both grains and cement (where.

Impure quartzites include graywackle, litharenite, and sandstone. Quartzite is a source of silica for metallurgical purposes.

It is also quarried for paving blocks. Quartzite. A metamorphic rock that is formed when quartz rich sandstone is altered by heat, pressure and chemical activity.

Because it is formed from sandstone, most quartzites have a fine-grained, soft and elegant appearance. Quartzites form when quartz sandstones are metamorphosed. Quartzites often preserve original cross-bedding in the sandstone; sometimes deformation during metamorphism makes this cross-bedding look somewhat 'stirred'.

The way to tell a quartz sandstone from a quartzite is when you break a quartzite, the fracture will cut right through the quartz. kinds of different color Quartzite from 4 countries: Brazil,India,Italy,Spain,Norway,United States,etc.

All details about their properties, design, price. Real quartzites’ properties are very consistent. Let’s get to know the real quartzite. Quartzite is a metamorphic stone that is almost completely composed of mineral quartz. Similar to the process of billions of snowflakes merging together to form a solid iceberg, quartzite is composed of sand grains that form sandstone that is buried very.

Quartzite is a great choice for durability and style. View Arizona Tile's wide selection of quartzite slabs for interior home projects. All quartzites (real ones) should stand up to acids.

Colorful spices are another matter because that is all about porosity, which varies - even among true quartzites. The 'crystalline' quartzites like Taj Mahal and Sea Pearl have lower porosity and are more stain resistant than the granular ones like Macaubus.

Quartzites are resistant against weathering and therefore often form hills or mountains. Since quartzites can occur as large masses it was and is still used as building stone. Orthoquartzite: mostly very pure quartz (99%) composed of well rounded quartz grains.

Original texture and sedimentary structures are usually preserved.Quartz, widely distributed mineral of many varieties that consists primarily of silica, or silicon dioxide.

Minor impurities such as lithium, sodium, potassium, and titanium may be present. Quartz has great economic importance. Learn more about quartz in this article.Quartzite is a coarse-grained metamorphic rock derived from sandstone. Heat and pressure combine to fuse grains of quartz sand that make up the composition of quartzite.

It has a uniform texture (non-foliated) and is very hard, 7 on the Mo's Scale.