These papers are from a special issue of Chemical Geology, volume 215 (2005), issues 1–4. They are a tribute to Robert O. Rye, known as "Bob" to most, in light of his highly productive and ongoing career. Almost all of the papers are derived from topical sessions on sulfate minerals in hydrothermal and low-temperature environments. The sessions, held at the 2000 Geological Society of America meeting in Reno, Nevada and sponsored jointly by the Mineralogical Society of America, the Society of Economic Geologists and the Geochemical Society, included 29 oral and 9 poster presentations. The sessions complemented a short course on the crystallography, geochemistry, and environmental significance of sulfate minerals, sponsored by the Mineralogical Society of America and the Geochemical Society, which immediately preceded the meeting. The papers here typify the breadth of Bob Rye’s research in this important area of geochemistry.

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2005

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Evolution of the magmatic-hydrothermal acid-sulfate system at Summitville, Colorado: integration of geological, stable-isotope, and fluid-inclusion evidence, Philip M. Bethke, Robert O. Rye, Roger E. Stoffregen, and Peter G. Vikre

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Supergene destruction of a hydrothermal replacement alunite deposit at Big Rock Candy Mountain, Utah: mineralogy, spectroscopic remote sensing, stable-isotope, and argon-age evidences, Charles G. Cunningham, Robert O. Rye, Barnaby W. Rockwell, Michael J. kUNK, and Terry B. Councell

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Alunite and the role of magmatic fluids in the Tambo high-sulfidation deposit, El Indio–Pascua belt, Chile, C.L. Deyell, R.O. Rye, G.P. Landis, and T. Bissig

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Sulfur and oxygen isotopic record in sulfate and sulfide minerals of early, deep, pre-Main Stage porphyry Cu–Mo and late Main Stage base-metal mineral deposits, Butte district, Montana, C.W. Field, L. Zhang, J.H. Dilles, Robert O. Rye, and M.H. Reed

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Stable-isotope geochemistry of the Pierina high-sulfidation Au–Ag deposit, Peru: influence of hydrodynamics on SO42-–H2S sulfur isotopic exchange in magmatic-steam and steam-heated environments, Richard H. Fifarek and Robert O. Rye

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Secondary sulfate minerals associated with acid drainage in the eastern US: recycling of metals and acidity in surficial environments, J.M. Hammarstrom, R.R. Seal II, A.L. Meier, and J.M. Kornfeld

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Major and trace element composition of copiapite-group minerals and coexisting water from the Richmond mine, Iron Mountain, California, Heather E. Jamieson, Clare Robinson, Charles N. Alpers, R. Blaine McCleskey, D. Kirk Nordstrom, and Ronald C. Peterson

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Paleoproterozoic high-sulfidation mineralization in the Tapajo´s gold province, Amazonian Craton, Brazil: geology, mineralogy, alunite argon age, and stable-isotope constraints, Caetano Juliani, Robert O. Rye, Carmen M.D. Nunes, Lawrence W. Snee, Rafael H. Corrêa Silva, Lena V.S. Monteiro, Jorge S. Bettencourt, Rainer Neumann, and Arnaldo Alcover Neto

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Evaluation of argon ages and integrity of fluid-inclusion compositions: stepwise noble gas heating experiments on 1.87 Ga alunite from Tapajo´ s Province, Brazil, G.P. Landis, L.W. Snee, and C. Juliani

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"Sour gas" hydrothermal jarosite: ancient to modern acid-sulfate mineralization in the southern Rio Grande Rift, Virgil W. Lueth, Robert O. Rye, and Lisa Peters

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Characterization of Waste Rock Associated With Acid Drainage at the Penn Mine, California, by Ground-Based Visible to Short-Wave Infrared Reflectance Spectroscopy Assisted by Digital Mapping, Irene C. Montero S., George H. Brimhalla, Charles N. Alpers, and Gregg A. Swayze

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A review of the stable-isotope geochemistry of sulfate minerals in selected igneous environments and related hydrothermal systems, Robert O. Rye

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Characterization of gas chemistry and noble-gas isotope ratios of inclusion fluids in magmatic-hydrothermal and magmatic-steam alunite, Robert O. Rye and G.P. Landis

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Geochemistry of Sulfate Minerals in High- and Low-Temperature Environments: A Tribute to Robert O. Rye, Robert R. Seal II, John L. Jambor, and Charles N. Alpers

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Chemical openness and potential for misinterpretation of the solute environment of coastal sabkhat, Warren W. Wood, Ward E. Sanford, and Shaun K. Frape

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Origin of secondary sulfate minerals on active andesitic stratovolcanoes, D.R. Zimbelman, Robert O. Rye, and G.N. Breit