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symplectite of pyrite and magnetite in the massive sulphide

Symplectite of pyrite and magnetite in the massive

Oct 01, 1997 A symplectite of pyrite and magnetite in the massive sulphide ore of the Mashan mine, Anhui Province, is interpreted to have been formed by their replacing earlier pyrrhotite. The compositions of pyrrhotite, pyrite and magnetite related to this texture are given by electron microprobe analysis. Such a texture is likely to be formed when the ore-forming system reaches the three-phase

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Symplectite of pyrite and magnetite in the massive

Mar 27, 2008 A symplectite of pyrite and magnetite in the massive sulphide ore of the Mashan mine, Anhui Province, is interpreted to have been formed by their replacing earlier pyrrhotite. The compositions of pyrrhotite, pyrite and magnetite related to this texture are given by electron microprobe analysis. Such a texture is likely to be formed when the ore-forming system reaches the three-phase

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Trace elements in disseminated sulfides, magnetite, and

Samples of pyrite separates from massive sulphide layers vary stratigraphically in trace-element content, and show an enrichment of many of the elements in the centre of the layers. Trace-element contents of pyrite of massive sulphide deposits, of magnetite from a magnetite deposit, and of disseminated sulphides differ, presumably reflecting different origins.

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Massive Sulfide an overview ScienceDirect Topics

Mar 03, 2012 The deposits contain the sulfide minerals chalcopyrite, sphalerite, galena, pyrrhotite, and pyrite as well as magnetite. They occur in submarine volcanic terranes associated with seafloor spreading and range in age from Archean to present day (such as the Juan de Fuca Ridge located several hundred kilometers off the coast of Western Canada and

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Pyrrhotite textures and their genetic implications in the

Gu Lianxing, Zhang Wenlan, Yin Lin, and Zhou Bin, 1997, Symplectite of pyrite and magnetite in the massive sulphide ores of the Mashan mine, Anhui Province: Chinese J.

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MASSIVE SULPHIDE DEPOSITS Earth Science

1. VMS Volcanogenic Massive Sulphide Deposits and Ni-Cu-Co Type Magmatic Massive Sulphide Deposits Volcanic-associated massive sulphide (VMS) deposits occur throughout the world and throughout the geological time column in virtually every tectonic domain that has submarine volcanic rocks as an important constituent.

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8. Hypogene Ore Characteristics USGS

stockwork is dominated by chalcopyrite + pyrite ± magnetite, the basal part of the massive sulfide body is dominated by pyrite + chalcopyrite, and the upper and outer margins of the massive sulfide are dominated by sphalerite ± galena (± barite) has long been recognized in VMS systems (Lambert and

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Pyrrhotite textures and their genetic implications in the

Oct 08, 2009 Symplectite of pyrite and magnetite in the massive sulphide ores of the Mashan mine, Anhui Province Lianxing, Gu; Wenlan, Zhang; Lin, Yin; Bin, Zhou Relationships between gold deposits and ductile shear zones and overprint structures, in Zhang Yixia and Liu Liandeng, eds., Precambrian ore deposits and tectonics in China

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Replacement of magnetite by pyrite under hydrothermal

Pyrite occurs as anhedral to euhedral grains and aggregates parallel to layering, in discordant fractures and associated alteration haloes, and as massive sulphide-quartz veins.

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Copper, gold and silver enrichment in ore mylonites within

Jan 01, 2007 Magnetite in intergrowths with pyrrhotite and pyrite has been widely reported in metamorphosed massive sulphide ores (e.g., Gu et al., 1997, Alirezaei and Cameron, 2002). Such textures are likely to indicate that replacement reactions took place close to the magnetite–sulphide phase boundaries in a sulphide-buffered system, and that sulphur

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7. Geophysical Characteristics of Volcanogenic Massive

118 7. Geophysical Characteristics of Volcanogenic Massive Sulfide Deposits Figure 7–1. Schematic diagram of the modern Trans-Atlantic Geothermal (TAG) sulfide deposit on the Mid-Atlantic Ridge, depicting a cross section of a volcanogenic massive sulfide deposit with concordant semi-massive to massive sulfide lens underlain by a

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Geology and geochemistry of the Chu Chua massive sulfide

Two major lensoid massive sulfide bodies composed mainly of pyrite and chalcopyrite are underlain by chemically precipitated massive siliceous, and talcose rocks. The composition and temperature of the hydrothermal solutions have been constrained by a consideration of observed mineral associations and relative stabilities of talc, pyrrhotite

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8. Hypogene Ore Characteristics USGS

stockwork is dominated by chalcopyrite + pyrite ± magnetite, the basal part of the massive sulfide body is dominated by pyrite + chalcopyrite, and the upper and outer margins of the massive sulfide are dominated by sphalerite ± galena (± barite) has long been recognized in VMS systems (Lambert and

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MASSIVE SULPHIDE DEPOSITS Earth Science

1. VMS Volcanogenic Massive Sulphide Deposits and Ni-Cu-Co Type Magmatic Massive Sulphide Deposits Volcanic-associated massive sulphide (VMS) deposits occur throughout the world and throughout the geological time column in virtually every tectonic domain that has submarine volcanic rocks as an important constituent.

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Identification of massive sulphide targets using the

pyrite and pyrrhotite. Gold intersections included 1m @ 0.5g/t and 1m @ 3.06g/t. At the Western targets narrow (1-2m) wide zones of massive sulphide, and wider (4-7m) zones of semi-massive (40-50%) sulphide dominated by pyrite-pyrrhotite were intersected (Figure 7). The sulphide units were intersected less than 5m from the modelled positions..

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The Archean Cu-Zn Magnetite-Rich Gossan Hill Volcanic

Massive magnetite formed from H 2 S-poor fluids, whereas massive sulfide formed from relatively rich H 2 S fluids. Physicochemical changes associated with interaction between upwelling, H 2 S-bearing fluids and preexisting massive magnetite may have resulted in the subsea-floor precipitation of sulfide in the lower Cu-rich ore zone.

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Experimental investigation of the reactions between pyrite

A similar zoning sequence in these sulfides has been occasionally reported for other types of ore deposits, such as stratabound manto-type Cu deposits (Wilson et al., 2003, Kojima et al., 2009), hematite-rich Fe-oxide–Cu–Au (IOCG) deposits (Chen et al., 2010, Schlegel et al., 2017), massive sulfide deposits (Mozgova et al., 2008), high

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Formation of massive iron deposits linked to explosive

Oct 05, 2018 (d) Ti-poor Magnetite-γ from pyrite-rich massive magnetite zone associated with gypsum veinlets. Magnetite-γ overgrowth developed on an inclusion-rich Magnetite-β

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Sulfide mineralization is induced by shallow intrusion on

Sulfide mineralization in this field can be divided into stockwork, semi-massive, and oxidation stages. The stockwork stage mainly comprised pyrite, chalcopyrite, magnetite, hematite, and ilmenite. However, the semi-massive stage mainly comprised chalcopyrite, pyrite, pyrrhotite, and minor sphalerite.

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Norway Vulcan Energy Resources Limited

The deposit consists of massive sulphide ore predominantly of pyrite with subordinate chalcopyrite and sphalerite, whereas galena, magnetite, haematite and bornite are minor components locally and fahlore is the most important accessory phase.

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Banded sulfide-magnetite ores of Mauk copper massive

The results of investigation of metamorphosed sulfide-magnetite ores from the Mauk deposit located within the Main Ural Fault at the junction of Tagil and Magnitogorsk massive sulfide zones are discussed. The ore-hosting sequence comprises metamorphic rocks formed from basalt, carbonaceous and carbonaceous-cherty siltstone, and lenticular serpentinized ultramafic bodies.

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Skarn and Cu-(Au)-rich massive sulfide/specularite

No magnetite or specularite and only traces of chalcopyrite precipitated with galena-bearing massive sulfide. Massive specularite-sulfide mantos (5-60 m thick, < 90 m wide, and < 300 m down the dip) post- date skarn and consist of coarse-grained specular hematite, pyrite, chalcopyrite, bornite, minor chalcocite, and < 5% quartz. Rock types tend

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Wisconsin Geological & Natural History Survey » Pyrrhotite

MARINETTE COUNTY: Pyrrhotite is a major sulfide mineral at the Duval massive sulfide deposit, sec. 2 and 3 T.35N. R.18E. and sec. 28 T.36N. R.18E. Here it occurs intergrown with pyrite, sphalerite and chalcopyrite in a magnetite-grunerite iron formation. An estimated 10 million tons of sulfide ore exist in this deposit (Hollister and Cummings

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(PDF) Oxide-sulphide relationships in sodalite-bearing

This analogy can be taken as additional evidence that the oxide±sulphide aggregates in sample Ku-97-24 were de- rived, during the metasomatic event, from pyrrhotite with included magnetite. The pyrite and magnetite grains in the central parts of the domains, both occasionally intergrown with millerite, have apparently recrystallised, as

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Massive Sulfide an overview ScienceDirect Topics

Mar 03, 2012 The deposits contain the sulfide minerals chalcopyrite, sphalerite, galena, pyrrhotite, and pyrite as well as magnetite. They occur in submarine volcanic terranes associated with seafloor spreading and range in age from Archean to present day (such as the Juan de Fuca Ridge located several hundred kilometers off the coast of Western Canada and

get price

7. Geophysical Characteristics of Volcanogenic Massive

118 7. Geophysical Characteristics of Volcanogenic Massive Sulfide Deposits Figure 7–1. Schematic diagram of the modern Trans-Atlantic Geothermal (TAG) sulfide deposit on the Mid-Atlantic Ridge, depicting a cross section of a volcanogenic massive sulfide deposit with concordant semi-massive to massive sulfide lens underlain by a

get price

Geology and geochemistry of the Chu Chua massive sulfide

Two major lensoid massive sulfide bodies composed mainly of pyrite and chalcopyrite are underlain by chemically precipitated massive siliceous, and talcose rocks. The composition and temperature of the hydrothermal solutions have been constrained by a consideration of observed mineral associations and relative stabilities of talc, pyrrhotite

get price

Identification of massive sulphide targets using the

pyrite and pyrrhotite. Gold intersections included 1m @ 0.5g/t and 1m @ 3.06g/t. At the Western targets narrow (1-2m) wide zones of massive sulphide, and wider (4-7m) zones of semi-massive (40-50%) sulphide dominated by pyrite-pyrrhotite were intersected (Figure 7). The sulphide units were intersected less than 5m from the modelled positions..

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Chemical evolution and zonation of massive sulfide

Base metal massive sulfide deposits within felsic volcanic piles are typically zoned from a copper-rich base to a zinc [plus-minus sign] lead-rich top. In the Noranda and Matagami mining camps in the Archean Superior Province of eastern Canada chalcopyrite is concentrated with pyrrhotite-pyrite [plus-minus sign] magnetite in the base of the massive sulfide ore lenses or xvithin a stringer zone

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Optimization of Cu–Zn Massive Sulphide Flotation by

massive sulphide ore is dependent on type of collector, pH of medium and additives functional reagents [1]. Sphalerite and pyrite usually occur together in ore along

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The Archean Cu-Zn Magnetite-Rich Gossan Hill Volcanic

Massive magnetite formed from H 2 S-poor fluids, whereas massive sulfide formed from relatively rich H 2 S fluids. Physicochemical changes associated with interaction between upwelling, H 2 S-bearing fluids and preexisting massive magnetite may have resulted in the subsea-floor precipitation of sulfide in the lower Cu-rich ore zone.

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Origin of Mafic–Ultramafic-Hosted Sulphides: The Pindos

Au in pyrite, 8.8 ppm Au in very fine intergrowths between pyrite and sphalerite, and 17.3 ppm Au in fine intergrowths between pyrite and bornite [20] Figure 1. Simplified geological map of the southern part of the Pindos ophiolite, showing the Perivoli (Tsoumes–Kondro) area (modified after [22,24]).

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Experimental investigation of the reactions between pyrite

A similar zoning sequence in these sulfides has been occasionally reported for other types of ore deposits, such as stratabound manto-type Cu deposits (Wilson et al., 2003, Kojima et al., 2009), hematite-rich Fe-oxide–Cu–Au (IOCG) deposits (Chen et al., 2010, Schlegel et al., 2017), massive sulfide deposits (Mozgova et al., 2008), high

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Virtual Atlas of Opaque and Ore Minerals

Disseminated sulphides also occur in the hangingwall quartz norite. The quartz diorite offsets have massive sulphides ores and disseminated sulphide-rich rocks. The ores comprise hexagonal and monoclinic pyrrhotite, pentlandite, chalcopyrite, pyrite and magnetite together with ilmenite, cubanite, cobaltite, niccolite and gersdorffite.

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(PDF) Oxide-sulphide relationships in sodalite-bearing

This analogy can be taken as additional evidence that the oxide±sulphide aggregates in sample Ku-97-24 were de- rived, during the metasomatic event, from pyrrhotite with included magnetite. The pyrite and magnetite grains in the central parts of the domains, both occasionally intergrown with millerite, have apparently recrystallised, as

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Besshi-type VMS deposits (Part I) The Northern Miner

Jul 03, 2000 The sulphide mineralization consists predominantly of iron sulphides (pyrite and/or pyrrhotite), with lesser chalcopyrite; sphalerite may or may not be present. Unlike other VMS styles, however, Besshi sulphides can contain a highly varied and complex mineralogy, including magnetite, arsenopyrite, galena, bornite, tetrahedrite-tennantite

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THE EXPEDITO MASSIVE SULFIDE DEPOSIT, MATO GROSSO

The deposit is hosted by a horizon of dacitic lapilli and crystal tuff interlayered with massive dacitic porphyritic flows and carbonate and chert layers. The deposit consists of several discordant and discontinuous lenses of massive to semi-massive pyrrhotite, pyrite,

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Pyrite Uses, What Is It? What Is Fool's Gold?

Jul 31, 2020 Iron sulfide, better known as pyrite or fool's gold, could have a new lease on the high life after researchers turned it into a magnet using an electrical treatment. Physicists and chemical

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