Sulfur isotope fractionation in coexisting sulfides from the Heath Steele B-1 orebody, New Brunswick, Canada

Lusk, J.; Crocket, J. H.

doi:10.2113/gsecongeo.64.2.147

Cited by 27 publications

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“…It is not Common for normal fractionation to be present in most mineral pairs in such deposits. The only examples comparable with the present case are the Heath Steele (Lusk and Crocket 1969) and the Hitachi deposits of the epidote-amphibolite to amphibolite facies (Yamamoto etal. 1983).…”

Section: Fractionation Of Sulfur Isotopes Between Pyrite and Chalcopysupporting

confidence: 69%

“…3. Sulfur isotope fractionation between pyrite and chalcopyrite in regionally metamorphosed sulfide deposits has been studied by some workers (Runnells 1969, Lusk and Crocket 1969, Bachinski 1977, Ripley and Ohmoto 1977). It is not Common for normal fractionation to be present in most mineral pairs in such deposits.…”

Section: Fractionation Of Sulfur Isotopes Between Pyrite and Chalcopymentioning

confidence: 99%

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Fractionation of sulfur isotopes and selenium between coexisting sulfide minerals from the Besshi deposit, Central Shikoku, Japan

1984

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Abstract. Fractionation of sulfur isotopes and selenium was measured between coexisting pyrite and chalcopyrite and between coexisting pyrrhotite and chalcopyrite from the Besshi deposit of Kieslager-type, Central Shikoku, Japan. In all the pyrite-chalcopyrite pairs studied, 34S is enriched in pyrite relative to chalcopyrite, while selenium is enriched conversely in chalcopyrite relative to pyrite. The mean A34Spy_cp value is + 0.53_+ 0.36 per mil, and the mean value of the distribution coefficient of selenium, Dcp_py , is 2.58__ 0.64. In all the pyrrhotite-chalcopyrite pairs studied, the two minerals are very close to each other both in sulfur isotope and Se/S ratios. The mean A34Spo_cp value is -0.08 _+ 0.16 per mil and the mean Dcp_po value is 0.99 ± 0.05. The results have been discussed in comparison with similar data obtained for the Hitachi deposits of Kieslager-type, Japan ).

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Section: Fractionation Of Sulfur Isotopes Between Pyrite and Chalcopysupporting

confidence: 69%

Section: Fractionation Of Sulfur Isotopes Between Pyrite and Chalcopymentioning

confidence: 99%

Fractionation of sulfur isotopes and selenium between coexisting sulfide minerals from the Besshi deposit, Central Shikoku, Japan

1984

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“…On the contrary, as summarized in Table 2, the fractionation between pyrite and chalco pyrite in the regionally metamorphosed sulfide (11) -0 .94±4.84 (7) +0.68±0.37 (25) RUNNELLS ( 1969) LUSK andCROCKET (1969) RIPLEY and OHMOTO (1977) BACHINSKI (1977) This study' * Mean O py-,p value (= 534SPy 534Scp bers of analyzed pairs.…”

Section: Fractionation Of Sulfur Isotopes Between Co Existing Pyrite mentioning

confidence: 77%

“…In fact, KAJIWA RA and DATE (1971) analyzed two mill con centrates of different dates in addition to the above hand specimens and obtained the frac tionations of 0.6 and 0.7%o, which are very close to our grand mean, 0.68±0.37%0. the fractionation consistent with that in isotope equilibrium) in sphalerite-galena pairs, and in some favorable cases some meaningful tempera tures have been calculated, which are considered to be the temperatures of metamorphism, frozen isotope equilibrium or the deposition preceding metamorphism (e.g., STANTON and RAFTER, 1967;LUSK and CROCKET, 1969;CAMPBELL and ETHIER, 1974;BOTH and SMITH, 1975).…”

Section: Fractionation Of Sulfur Isotopes Between Co Existing Pyrite mentioning

confidence: 99%

Fractionation of sulfur isotopes and selenium between coexisting pyrite and chalcopyrite from the Hitachi deposits, Ibaraki Prefecture, Japan.

1983

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Sulfur isotopes and selenium/sulfur ratios were determined for coexisting pyrite and chalcopyrite from the Kieslager-type deposits of the Hitachi mine, Ibaraki Prefecture, Japan. All pyrite-chalcopyrite pairs analyzed exhibit the normal isotope fractionation, i.e., 34S is more enriched in pyrite than in chalcopyrite. Selenium is more enriched conversely in chalcopyrite than in pyrite. The mean 5345 differences between pyrite ' and chalcopyrite are 0.84±0.44%(I1) for the ore bodies of the epidote-amphibolite facies and 0.54±0.24%o (12) for those of the amphibolite facies. It seems too optimistic, however, to regard the observed differences in the mean value between the two facies as indicating the difference in metamorphic temperature between the two facies, because the magnitude of isotope fractionation is rather variable even within the single ore bodies..Partition of selenium between pyrite and chalcopyrite was found to be virtually the same for both the ,p_py, are 4.26±0.85 (12) for the epidotefacies. The mean distribution coefficients of selenium D, amphibolite facies and 4.44±1.60 (13) for the amphibolite facies. Near-equilibrium trend in sulfur isotope fractionation and rather consistent partition of selenium between pyrite and chalcopyrite strongly suggest that selenium equilibrium is also approached between the two minerals in the Hitachi deposits.

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“…In contrast, sulfur-bearing minerals from other environments are markedly enriched in 34 S and these data, together with geologic and other evidence, indicate a source of heavy sulfur from seawater or possibly sedimentary evaporites. Such deposits (see Figure 1) include sulfates in the metalliferous sediments (Dymond et al, 1973); and sulfates and sulfides in sediments of the Red Sea Basin (Kaplan et al, 1969) and in volcanogenic massive sulfide deposits at Heath Steele, New Brunswick (Dechow, 1960;Lusk and Crocket, 1969), and in the Kuroko District, Japan (Aoki et al, 1970;Ohmoto et al, 1970).…”

Section: Discussion and Interpretationmentioning

confidence: 99%

Sulfur Isotope Reconnaissance of Epigenetic Pyrite in Ocean-floor Basalts, Leg 34 and Elsewhere

Field¹,

Dymond²,

Heath³

et al. 1976

Initial Reports of the Deep Sea Drilling Project

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Sulfur isotope analyses of 10 epigenetic occurrences of pyrite in ocean-floor basalts yield an unexpectedly large range of á 34 S values (from -24.2 to +23.O°/oo) for sulfides that are inferred to be of hydrothermal origin. The existing geologic, mineralogical, and isotopic data do not permit an unambiguous interpretation of the chemical and thermal characteristics of these hydrothermal systems. They fit either of two hypothetical models that assume isotopic equilibration between varying proportions of oxidized and reduced species of sulfur, but with pyrite deposition either (1) at 150°C and less from an infinite reservoir of heavy (+21°/oo) seawater sulfur, or (2) at 300°C and less from a finite reservoir of deep-seated (O°/oo) "magmatic" sulfur. Further detail and elaboration of these or alternative models must await additional mineralogical and isotopic studies, particularly of coexisting hydrothermal assemblages.

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Sulfur isotope fractionation in coexisting sulfides from the Heath Steele B-1 orebody, New Brunswick, Canada

Cited by 27 publications

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Fractionation of sulfur isotopes and selenium between coexisting sulfide minerals from the Besshi deposit, Central Shikoku, Japan

Fractionation of sulfur isotopes and selenium between coexisting sulfide minerals from the Besshi deposit, Central Shikoku, Japan

Fractionation of sulfur isotopes and selenium between coexisting pyrite and chalcopyrite from the Hitachi deposits, Ibaraki Prefecture, Japan.

Sulfur Isotope Reconnaissance of Epigenetic Pyrite in Ocean-floor Basalts, Leg 34 and Elsewhere

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