Phase relations in the central portion of the Cu-Fe-Zn-S system between 800.DEG. and 500.DEG.C.

Kojima, Shoji; Sugaki, Asahiko

doi:10.2465/minerj.12.15

Cited by 41 publications

(31 citation statements)

References 18 publications

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“…The chemical compositions of skeletal sphalerites in pyrite and chalcopyrite as well as those of other sphalerites in the chalcopyrite-pyrite stage fall outside the 800°C limit of sphalerite solid solution field, determined experimentally by Kojima and Sugaki (1984).…”

Section: Discussionmentioning

confidence: 84%

An Unusual Texture: Skeletal Sphalerite in Pyrite from Dajing Tin‐polymetallic Deposit, China

Wang

2003

Resource Geology

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Skeletal sphalerite with stellar, cruciform and snowflake-like (or cauliflower-like) shapes included in pyrite is widely found in the Dajing tin-polymetallic deposit. It occurs only in chalcopyrite-pyrite mineralization stage. The compositions of all sphalerites in the chalcopyrite-pyrite stage are characterized by high Cu content (3.9 -7.0 wt% with a mean of 5.4 wt%), while the skeletal crystal sphalerite has higher zinc and cadmium contents, and lower copper and iron contents, compared with other sphalerites of the same stage. The skeletal crystal sphalerite in pyrite is possibly generated by exsolution.

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Section: Discussionmentioning

confidence: 84%

An Unusual Texture: Skeletal Sphalerite in Pyrite from Dajing Tin‐polymetallic Deposit, China

Wang

2003

Resource Geology

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“…However, studies of massive-sulfide and epithermal deposits (Eldridge et aI., 1983;Barton and Bethke, 1987) clearly show that replacement and co-depositional processes are important as well as exsolution. Moreover, a series of experimental studies (Wiggins and Craig, 1980;Hutchinson and Scott, 1981;andKojima andSugaki, 1984 and1985) have clearly shown that at typical low to moderate hydrothermal temperatures (below 400 or 500~ copper simply is too insoluble in sphalerite to support exsolution for features such as those illustrated in Fig. 6.…”

Section: An Enigmatic Set Of Curiosities: the Chalcopyrite Disease Inmentioning

confidence: 99%

Ore textures: problems and opportunities

Barton

1991

Mineral. mag.

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Over the past several decades, thinking about chemical processes in rocks had been dominated by experimental and theoretical treatments of mineral equilibrium, which is the state from which the time variable has been excluded. But, to an extent exceeding that of any of our sister sciences, we in geology are concerned with the behaviour of things as a function of time; thus equilibrium is but one of several interesting boundary conditions. Textures, (defined as the spatial relations within and among minerals and fluids, regardless of scale or origin) provide a means to sort out and identify successive states. In fact, it is the pattern of evolution of those states that enables us to deduce the processes. We may well draw the analogy with thermodynamics and kinetics, respectively: equilibrium textures and phase assemblages, via thermodynamic analysis ~ definition of conditions of equilibration, whereas kinetics, as displayed in disequilibrium textures --~ sequence of events and processes of mineralization.

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“…Mais recentemente, Amcoff (1981) realizou aquecimento em calcopirita e pirrotita e estudou a estabilidade da solução sólida intermediária. Paralelamente, Kojima & Sugaki (1984) estudaram as relações de fase na porção central do sistema quaternário Cu-Fe-Zn-S entre 800…”

Section: Quimismo E Seqüência De Cristalização Das Fases Minerais Sulunclassified

“…Segundo os trabalhos realizados por Sugaki et al (1975) e Kojima & Sugaki (1984 a solução sólida intermediaria estende-se para composições que correspondem estequiométrica-menteà cubanita, e para uma fase mais rica em Cu e deficiente em S (denominada mooihoekita, mh), em temperaturas de 350°C e 700-600°C respectivamente. Estes resultados são concordantes com os dados de Yund & Kullerud (1966) para 700°C, Mukaiyama & Izawa (1970) para 525°C e Barton (1973) para 600°C, com exceção de que, no estudo de Mukaiyama & Izawa (1970), a composição da cubanita cai dentro do campo de solução sólida intermediaria (SSI).…”

Section: Quimismo E Seqüência De Cristalização Das Fases Minerais Sulunclassified

“…Sugaki et al (1975) assinalam que a SSI coexiste estavelmente com pirita, pirrotita, solução sólida de calcopirita (SScp) e solução sólida de bornita (SSbor) a 350°C. Kojima & Sugaki (1984 . Kojima & Sugaki (1984 A calcopirrotita foi reportada por Ramdohr (1969) como uma das duas ocorrências de cubanita (ortorrômbica e isotrópica ou cubanita de alta temperatura, de simetria cúbica).…”

Section: Quimismo E Seqüência De Cristalização Das Fases Minerais Sulunclassified

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Caracterização e correlação de inclusões sólidas em pirita com alteração hidrotermais no pórfiro de cobre de Cuajone - Perú

Goyzueta¹,

Juli²

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Phase relations in the central portion of the Cu-Fe-Zn-S system between 800.DEG. and 500.DEG.C.

Cited by 41 publications

References 18 publications

An Unusual Texture: Skeletal Sphalerite in Pyrite from Dajing Tin‐polymetallic Deposit, China

An Unusual Texture: Skeletal Sphalerite in Pyrite from Dajing Tin‐polymetallic Deposit, China

Ore textures: problems and opportunities

Caracterização e correlação de inclusões sólidas em pirita com alteração hidrotermais no pórfiro de cobre de Cuajone - Perú

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