Pyrite stability relations in the Fe-S system

Abstract

Other| June 01, 1959 Pyrite stability relations in the Fe-S system Gunnar Kullerud; Gunnar Kullerud Search for other works by this author on: GSW Google Scholar Hatten Schuyler Yoder Hatten Schuyler Yoder Search for other works by this author on: GSW Google Scholar Author and Article Information Gunnar Kullerud Hatten Schuyler Yoder Publisher: Society of Economic Geologists First Online: 02 Mar 2017 Online ISSN: 1554-0774 Print ISSN: 0361-0128 GeoRef, Copyright 2004, American Geological Institute. Reference includes data from Bibliography and Index of North American Geology, U. S. Geological Survey, Reston, VA, United States Economic Geology (1959) 54 (4): 533–572. https://doi.org/10.2113/gsecongeo.54.4.533 Article history First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Gunnar Kullerud, Hatten Schuyler Yoder; Pyrite stability relations in the Fe-S system. Economic Geology 1959;; 54 (4): 533–572. doi: https://doi.org/10.2113/gsecongeo.54.4.533 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyEconomic Geology Search Advanced Search Abstract The reaction pyrite <--> pyrrhotite + liquid (or gas) was investigated up to 5,000 bars by means of a new technique. The univariant equilibrium curve for the reaction originates at an invariant point 743 degrees C. and about 10 bars and passes through the points 748 degrees C., 335 bars; 755 degrees , 1,000 bars; 770 degrees , 2,000 bars; and 810 degrees , 5,000 bars. The relations of pyrite in the Fe-S system are deduced from thermodynamic principles and available data. The limitations of the various experimental techniques for sulfide systems are analyzed in the light of the pressure-temperature diagram for the Fe-S system. The apparently large effect of Fe in the vapor or gas of the system is described. The occurrence of primary pyrite in some gabbros, amphibolites, and granites and not in basalts and rhyolites is accounted for by comparing the upper stability curves of pyrite at various partial pressures of S with the beginning of melting curves of rocks of basaltic and granitic compositions under hydrous conditions. When the partial pressure of S is less than about 10 bars small changes in its value have a great effect on the stability of pyrite. The relations of pyrite in the Fe-S system indicate that massive pyrite bodies could not have crystallized directly from a liquid of pyrite composition. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.