scholarly journals Response to Comment on "Abiotic Pyrite Formation Produces a Large Fe Isotope Fractionation"

Science ◽  
2012 ◽  
Vol 335 (6068) ◽  
pp. 538-538 ◽  
Author(s):  
R. Guilbaud ◽  
I. B. Butler ◽  
R. M. Ellam
Keyword(s):  
Isotope Fractionation ◽  
Pyrite Formation

scholarly journals Comment on "Abiotic Pyrite Formation Produces a Large Fe Isotope Fractionation"

Science ◽  
2012 ◽  
Vol 335 (6068) ◽  
pp. 538-538 ◽  
Author(s):  
A. D. Czaja ◽  
C. M. Johnson ◽  
K. E. Yamaguchi ◽  
B. L. Beard
Keyword(s):  
Isotope Fractionation ◽  
Pyrite Formation

scholarly journals Iron isotope fractionation during pyrite formation in a sulfidic Precambrian ocean analogue

2018 ◽  
Vol 488 ◽  
pp. 1-13 ◽  
Author(s):  
John M. Rolison ◽  
Claudine H. Stirling ◽  
Rob Middag ◽  
Melanie Gault-Ringold ◽  
Ejin George ◽  
...  
Keyword(s):  
Isotope Fractionation ◽  
Iron Isotope ◽  
Pyrite Formation

Diagenetic pyrite formation and sulphur isotope fractionation associated with a Westphalian marine incursion, northern England

1983 ◽  
Vol 74 (3) ◽  
pp. 165-182 ◽  
Author(s):  
L. G. Love ◽  
M. L. Coleman ◽  
C. D. Curtis
Keyword(s):  
Fresh Water ◽  
Isotope Fractionation ◽  
Sediment Deposition ◽  
Sulphur Isotope ◽  
Isotope Data ◽  
Pyrite Formation ◽  
Relationship Of ◽  
Coal Measures ◽  
The Relationship ◽  
S Isotope

ABSTRACTPyrite textures are described and illustrated and stable S-isotope data are presented from the Alton (Gastrioceras listen) marine horizon of the Westphalian Lower Coal Measures, from sections near Penistone in central northern England, with the object of relating the paragenetic sequence of pyrite formation to the conditions of sediment deposition and diagenesis. The earliest diagenetic pyrite is dispersed as framboidal and related textures. It is followed in the marine shale, coal and ganister by more localised but more intense pyrite deposition and replacement in a variety of textures. Most of this is precompactional in age, but some, together with pyrite in veinlets and cleat, is postcompactional. Marcasite is rare and mainly late. δ34S ratios range between −35·31‰ and +20·39‰. There is a definite trend from lighter values (−1·15 ± 6·47‰) in the marine part of the sequence to much heavier values (+12·73 ± 7·66‰) in the sediment below the coal. This allows the relationship of the earliest pyrite deposition in the coal-peat and ganister to the chemistry of their own depositional fresh water to be seen but then relates the main pyrite deposition to the influx of the marine-water sulphate of the Alton horizon, and shows the penetration of this influence downward into the coal-peat and its seat-bed.

scholarly journals Iron Isotope Fractionation during Skarn Cu-Fe Mineralization

Minerals ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 444
Author(s):  
Song Xue ◽  
Yaoling Niu ◽  
Yanhong Chen ◽  
Yining Shi ◽  
Boyang Xia ◽  
...  
Keyword(s):  
Hydrothermal System ◽  
Isotope Fractionation ◽  
Inverse Correlation ◽  
Ore Deposits ◽  
Equilibrium Line ◽  
Skarn Deposit ◽  
Fe Isotopes ◽  
Pyrite Formation ◽  
Skarn Deposits ◽  
Pathway Effect

Fe isotopes have been applied to the petrogenesis of ore deposits. However, the behavior of iron isotopes in the mineralization of porphyry-skarn deposits is still poorly understood. In this study, we report the Fe isotopes of ore mineral separations (magnetite, pyrite, chalcopyrite and pyrrhotite) from two different skarn deposits, i.e., the Tonglvshan Cu-Fe skarn deposit developed in an oxidized hydrothermal system and the Anqing Cu skarn deposit developed in a reduced hydrothermal system. In both deposits, the Fe isotopes of calculated equilibrium fluids are lighter than those of the intrusions responsible for the skarn and porphyry mineralization, corroborating the “light-Fe fluid” hypothesis. Interestingly, chalcopyrite in the oxidized-Tonglvshan skarn deposit has lighter Fe than chalcopyrite in the reduced-Anqing skarn deposit, which is best understood as the result of the prior precipitation of magnetite (heavy Fe) from the ore fluid in the oxidized-Tonglvshan systems and the prior precipitation of pyrrhotite (light Fe) from the ore fluid in the reduced-Anqing system. The δ56Fe for pyrite shows an inverse correlation with δ56Fe of magnetite in the Tonglvshan. In both deposits, the Fe isotope fractionation between chalcopyrite and pyrite is offset from the equilibrium line at 350 °C and lies between the FeS-chalcopyrite equilibrium line and pyrite-chalcopyrite equilibrium line at 350 °C. These observations are consistent with the FeS pathway towards pyrite formation. That is, Fe isotopes fractionation during pyrite formation depends on a path from the initial FeS-fluid equilibrium towards the pyrite-fluid equilibrium due to the increasing extent of Fe isotopic exchange with fluids. This finding, together with the data from other deposits, allows us to propose that the pathway effect of pyrite formation in the Porphyry-skarn deposit mineralization is the dominant mechanism that controls Fe isotope characteristics.

scholarly journals Abiotic Pyrite Formation Produces a Large Fe Isotope Fractionation

Science ◽  
2011 ◽  
Vol 332 (6037) ◽  
pp. 1548-1551 ◽  
Author(s):  
R. Guilbaud ◽  
I. B. Butler ◽  
R. M. Ellam
Keyword(s):  
Isotope Fractionation ◽  
Pyrite Formation

Stabilizing pyritic material

1989 ◽  
Vol 4 ◽  
pp. 244-248 ◽  
Author(s):  
Donald L. Wolberg
Keyword(s):  
Significant Contribution ◽  
Organic Materials ◽  
Sedimentary Rocks ◽  
Iron Sulfides ◽  
Decomposition Products ◽  
Iron Minerals ◽  
Pyrite Formation ◽  
Organic Sediments ◽  
Freshwater Environments

The minerals pyrite and marcasite (broadly termed pyritic minerals) are iron sulfides that are common if not ubiquitous in sedimentary rocks, especially in association with organic materials (Berner, 1970). In most marine sedimentary associations, pyrite and marcasite are associated with organic sediments rich in dissolved sulfate and iron minerals. Because of the rapid consumption of sulfate in freshwater environments, however, pyrite formation is more restricted in nonmarine sediments (Berner, 1983). The origin of the sulfur in nonmarine environments must lie within pre-existing rocks or volcanic detritus; a relatively small, but significant contribution may derive from plant and animal decomposition products.

Isotopic Characterization (2H, 13C, 37Cl, 81Br) of the Abiotic Sinks of Methyl Bromide and Methyl Chloride in Water and Implications for Future Studies.

2018 ◽  
Author(s):  
Axel Horst ◽  
Magali Bonifacie ◽  
Gérard Bardoux ◽  
Hans-Hermann Richnow
Keyword(s):  
Methyl Bromide ◽  
Isotope Fractionation ◽  
Methyl Chloride ◽  
Methyl Halides ◽  
Future Studies ◽  
Halide Exchange ◽  
Isotopic Characterization

In this study we investigated the isotope fractionation of the abiotic sink (hydrolysis, halide exchange) of methyl halides in water.<br>

SULFUR CYCLING AND PYRITE FORMATION IN MODERN EUXINIC LAKES

2017 ◽  
Author(s):  
Fotios Fouskas ◽  
◽  
William Gilhooly ◽  
Josef P. Werne ◽  
Molly D. O'Beirne
Keyword(s):  
Sulfur Cycling ◽  
Pyrite Formation
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