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ore minerals of the norites

ore minerals of the norites

Notes on Minerals Grade 8 > Science > Structure of. Mineral is naturally occurring substance that is solid and inorganic representable by the chemical formula. Hematite, chalcopyrite, cuprite, and argentite are important ore of the minerals. Some of the examples of minerals are diamond, gold, copper, etc.

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Norite - an overview ScienceDirect Topics

The minerals developed between these olivine and orthopyroxene crystals are plagioclase, augite, phlogopite and sulfide. The phlogopite commonly contains small elongate needles of apatite. These inclusions have remarkably high phlogopite content, sometimes approaching 15%, and up to 1% apatite (eg, Lightfoot et al., 1997c; Warner et al., 1998).

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Norite - Wikipedia

Jump to navigation Jump to search. sample of norite. Shocked norite found in the Taurus-Littrow valley on the moon during the Apollo 17 mission (sample 78236). Norite is a mafic intrusive igneous rock composed largely of the calcium -rich plagioclase labradorite, orthopyroxene, and olivine.

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Norite rock Britannica

occurrence in Sudbury Complex. of a mafic rock called norite lies above a discontinuous zone of gabbro, some of which contains numerous broken fragments of the underlying basement rocks and some of which is rich in sulfide ore minerals of nickel, copper, and platinum-group metals.

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The Origin and Evolution of Ore-Bearing Rocks in the ...

the barren and ore-bearing varieties of norites and pyroxenites in the Loypishnun deposit shows that the ore samples have the lowest negative "Nd values, a relatively more di erentiated distribution spectrum with the Light rare earth elements (LREE) dominating over the Heavy REE (HREE), Eu/Eu* 1, and a higher mean content of alkali and large-ion lithophile elements (Ba, Rb, and Cs). New ...

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Geological structure and ore mineralization of the South ...

09/08/2015  Trace element data indicate that the gabbronorites have similar compositions to rocks of the upper part of the Monchetundra intrusion, whereas the norites and pyroxenites resemble rocks from the lower to intermediate stratigraphic levels of the Monchepluton, such as in the Nude-Poaz and Sopcha massifs. Sulfide mineralization in the studied targets principally consists of secondary bornite, millerite, and chalcopyrite. In contrast, the primary sulfide

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Geological structure and ore mineralization of the South ...

Trace element data indicate that the gabbronorites have similar compositions to rocks of the upper part of the Monchetundra intrusion, whereas the norites and pyroxenites resemble rocks from the lower to intermediate stratigraphic levels of the Monchepluton, such as in the Nude-Poaz and Sopcha massifs. Sulfide mineralization in the studied targets principally consists of secondary bornite, millerite, and

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Mineral resources of the Suwalki region*

rugged or wavy with anorthosites, straightline or gradually alternating with norites. The ore consists of a mineral aggregate containing titanium and vanadium-bearing magnetite, ilmenite and hematite-ilmenite occurring in different ratios from 1: 1 to 5:1 and

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The Origin and Evolution of Ore-Bearing Rocks in the ...

and norites. The Western Nittis and Loypishnun deposits were discovered as a result of geological prospecting. According to Chashchin [13], they belong to a low-sulfide basal type of structure. The deposits are confined to the sulfide mineralization with a mean Pt + Pd content of up to 2 ppm; the ores

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Trace elements in the Merensky Reef and adjacent norites ...

The low abundances of minerals other than roxene and 20% interstitial plagioclase; for the norites, orthopyroxene and plagioclase in these rocks is indicated the proportions are 75–80% cumulus plagioclase and by the close correspondence between the bulk-rock 20–25% interstitial orthopyroxene. 558 Table 1 Major- and trace-element analyses of whole rocks Sample R22-27 R22-52 R24-1 R24-6

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Frontiers Geodynamic Implications of Synchronous Norite ...

22/09/2020  However, the ratio of plagioclase to mafic minerals is lower in the retrogressed norites, and plagioclase grain size tends to be smaller. The mafic portions of the retrogressed norites show a fine-grained interlocking texture of biotite and amphibole. Biotite contents are higher in retrogressed samples. Coexisting retrogressed and non-retrogressed assemblages and textures are visible at the ...

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The geological setting of the platinoid and base metal ...

On the farm Drenthe, the Platreef consists of a complex assemblage of norites, melanorites, pyroxenites, serpentinites, and xenoliths of dolomite. It is a zone of up to 250 m thick between the basal contact of the complex and the overlying main zone norites. The composition of the orthopyroxene shows a rapid increase from En

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Bushveld Igneous Complex - Wikipedia

The Lower Reef is composed of norites and feldspathic pyroxenites that have been recrystallized and overprinted. This layer has abundant country-rock xenoliths particularly near the base of the layer. The Central or Middle Reef is composed of igneous peridotite and recrystallized "vari-textured" mafic rocks with metasedimentary xenoliths.

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v118n1a8 Effect of frother and depressant interaction on ...

norites, gabbronorites, and olivine gabbros) (Prendergast, 1990). The primary collector used in ore flotation is xanthate. A depressant is added to suppress naturally floating gangue minerals. Optimization of reagents has been traditionally performed by varying one while keeping the others fixed. This method ignores interaction effects among reagents. Changes in reagent dosage to achieve a ...

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Mineralogy, petrology and ore geology of the Xerolivado ...

The mantle unit consists of hartzburgites and dunites which very often host chrome ores, whereas the magmatic sequence consists of dunites, gabbros, norites and wherlites. At the upper part of the magmatic sequence, diorites, diabases, dacites and granophyres are found.The Xerolivado Mine is located at Southern Vourinos (Mountain Flampouro) and it belongs to the base of the ophiolitic sequence of Vourinos. The chrome ore

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of Palaeoproterozoic PGE Intrusions in the Fennoscandian ...

Major ore minerals are chalcopyrite, pyrrhotite and pentlandite. Their average proportions recalculated for 100% sulfide are 41%, 35%, and 24%, respectively. In the total amount of sulfides, their portion is 95 100%. Secondary and accessory minerals are pyrite, ilmenite, magnetite,

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The Origin and Evolution of Ore-Bearing Rocks in the ...

and norites. The Western Nittis and Loypishnun deposits were discovered as a result of geological prospecting. According to Chashchin [13], they belong to a low-sulfide basal type of structure. The deposits are confined to the sulfide mineralization with a mean Pt + Pd content of up to 2 ppm; the ores

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Trace elements in the Merensky Reef and adjacent norites ...

The low abundances of minerals other than roxene and 20% interstitial plagioclase; for the norites, orthopyroxene and plagioclase in these rocks is indicated the proportions are 75–80% cumulus plagioclase and by the close correspondence between the bulk-rock 20–25% interstitial orthopyroxene. 558 Table 1 Major- and trace-element analyses of whole rocks Sample R22-27 R22-52 R24-1 R24-6

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CHAPTER 9

ultramaficigneous rocks,notably norites andbasalts.In most deposits ofthis type, pyrrhotite (commonly, in large part, the magnetic monoclinic variety) constitutes the principal ore mineral making up 80% or more of the ore. Chalcopyrite, the primary source ofcopper in these ores, is present as ir­

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The Fe-Ti-V ore deposits - new insight from the ...

by the rings of norites, gabbronorites, diorites and granites. The Fe-Ti-V large ore deposits (˘1.5 billion of tonnes) in Krzemianka and Udryn areas and two other smaller bodies were established as mining prospective fields within the SAM. Titanomagnetite, ilmenite and sulphides: pyrite, pyrrhotite, chalcopyrite are main ore minerals. The Fe-Cu-Co-Ni sulphides represent 1 to 4% of the rock ...

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The geological setting of the platinoid and base metal ...

On the farm Drenthe, the Platreef consists of a complex assemblage of norites, melanorites, pyroxenites, serpentinites, and xenoliths of dolomite. It is a zone of up to 250 m thick between the basal contact of the complex and the overlying main zone norites. The composition of the orthopyroxene shows a rapid increase from En

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Frontiers Geodynamic Implications of Synchronous Norite ...

22/09/2020  However, the ratio of plagioclase to mafic minerals is lower in the retrogressed norites, and plagioclase grain size tends to be smaller. The mafic portions of the retrogressed norites show a fine-grained interlocking texture of biotite and amphibole. Biotite contents are higher in retrogressed samples. Coexisting retrogressed and non-retrogressed assemblages and textures are visible at the ...

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Bushveld Igneous Complex - Wikipedia

The Lower Reef is composed of norites and feldspathic pyroxenites that have been recrystallized and overprinted. This layer has abundant country-rock xenoliths particularly near the base of the layer. The Central or Middle Reef is composed of igneous peridotite and recrystallized "vari-textured" mafic rocks with metasedimentary xenoliths.

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v118n1a8 Effect of frother and depressant interaction on ...

norites, gabbronorites, and olivine gabbros) (Prendergast, 1990). The primary collector used in ore flotation is xanthate. A depressant is added to suppress naturally floating gangue minerals. Optimization of reagents has been traditionally performed by varying one while keeping the others fixed. This method ignores interaction effects among reagents. Changes in reagent dosage to achieve a ...

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Mineralogy, petrology and ore geology of the Xerolivado ...

Other accessory minerals found are olivine, Cr-spinel, magnetite, Fe-Ni-Co sulphides (awaruite, petlandite, heazlewoodite), chlorite and carbon minerals. Cr-spinels in the serpentinites are some times found altered to Fe-chromite. The formation of magnetite and sulphides and the alteration of chromite to Fe-chromite are attributed to serpentinization processes.Chromite in chromitites has a pull-apart

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of Palaeoproterozoic PGE Intrusions in the Fennoscandian ...

Major ore minerals are chalcopyrite, pyrrhotite and pentlandite. Their average proportions recalculated for 100% sulfide are 41%, 35%, and 24%, respectively. In the total amount of sulfides, their portion is 95 100%. Secondary and accessory minerals are pyrite, ilmenite, magnetite,

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