Alunite and the role of magmatic fluids in the Tambo high-sulfidation deposit, El Indio-Pascua belt, Chile

Chemical Geology

Volumn 215, Issue 1-4 SPEC. ISS., 2005, Pages 185-218

  Deyell, C L ^a,d   Rye, R O ^b   Landis, G P ^b   Bissig, T ^c  

^a UNIVERSITY OF BRITISH COLUMBIA   (Canada)

^b DENVER FEDERAL CENTER   (United States)

^c QUEEN S UNIVERSITY   (Canada)

^d UNIVERSITY OF TASMANIA   (Australia)

Author keywords

Acid sulfate; Alunite; El Indio Pascua belt; Epithermal; Gold; Stable isotopes; Tambo deposit

Indexed keywords

ALUNITE; GOLD; MAGMATISM; ORE DEPOSIT; ORE-FORMING FLUID;

EL INDIO-PASCUA BELT; SOUTH AMERICA; WESTERN HEMISPHERE; WORLD;

EID: 14544285047     PISSN: 00092541     EISSN: None     Source Type: Journal    
DOI: 10.1016/j.chemgeo.2004.06.038     Document Type: Article

References (120)

1. M. Aoki Mineralogical features and genesis of alunite solid solution in high temperature magmatic-hydrothermal systems J. Geol. Surv. Jpn. 277 1991 31-32
2. M. Aoki E.C. Comsti F.B. Lazo Y. Matsuhisa Advanced argillic alteration and geochemistry of alunite in an evolving hydrothermal system at Baguio, northern Luzon, Philippines Resour. Geol. 43 1993 155-164
3. S.M. Archibald A.A. Migdisov A.E. Williams-Jones The stability of Au-chloride complexes in water vapor at elevated temperature and pressures Geochim. Cosmochim. Acta 65 2001 4413-4423
4. A. Arribas Jr. Characteristics of high sulfidation epithermal deposits, and their relation to magmatic fluids In: J.F.H. Thompson (Ed.) Magmas, Fluids, and Ore Deposits. Mineral. Assoc. Can. Short Course vol. 23 1995 419-454
5. A. Arribas Jr. C.G. Cunningham J.J. Rytuba R.O. Rye W.C. Kelly E.H. McKee M.H. Podwysocky R.M. Tosdal Geology, geochronology, fluid inclusions, and stable isotope geochemistry of the Rodalquilar Au alunite deposit, Spain Econ. Geol. 90 1995 795-822
6. A. Audétat D. Günther C.A. Heinrich Formation of magmatic-hydrothermal ore deposit: Insights with LA-ICP-MS analysis of fluid inclusions Science 279 1998 2091-2094
7. M. Barazangi B.L. Isacks Spatial distribution of earthquakes and subduction of the Nazca Plate beneath South America Geology 4 1976 686-692
8. Beane R.E. 1991 Deposit correlations in the El Indio Belt, Chile: mineral paragenesis, fluid inclusions and sulfur isotopes. Barrick Gold and Barick Chile, Internal company report, La Serena, Chile
9. Bennet R.E. 1995 A combined hydrothermal alteration study and exploration target evaluation of the Tambo mining district, El Indio mineral belt, Region IV, Chile. Companià Minera San José, Internal company report, Chile
10. P.M. Bethke Controls on base- and precious-metal mineralization in deeper epithermal environments Open-File Rep. U.S. Geol. Surv. 1984 84-890
11. Bissig T. 2001 Metallogenesis of the Miocene El Indio-Pascua gold-silver-copper belt, Chile/Argentina: Geodynamic, geomorphological and petrochemical controls on epithermal mineralization Ph.D. thesis, Queen's University, Kingston, Canada
12. D.J. Bove R.O. Rye K. Hon Evolution of the Red Mountain alunite deposits, Lake City, Colorado U.S. Geol. Surv. Open-File 1990 90-102
13. C.W. Burnham Magmas and hydrothermal fluids In: H.L. Barnes (Ed.) Geochemistry of Hydrothermal Ore Deposits 1979 Wiley New York 71-136
14. W.C. Burnham H. Ohomoto Late-stage processes of felsic magmatism Min. Geol. Spec. Issue 8 1980 1-11
15. P.A. Candela P.M. Piccoli Model ore-metal partitioning from melts into vapor and vapor-brine mixtures In: J.F.H. Thompson (Ed.) Magmas, Fluids, and Ore Deposits Mineral. Assoc. Can. Short Course vol. 23 1995 101-127
16. R.N. Clayton T.K. Mayeda The use of bromine pentafluoride in the extraction of oxygen from oxides and silicates for isotopic analysis Geochim. Cosmochim. Acta 27 1963 43-52
17. D.R. Cooke D.C. McPhail Epithermal Au-Ag-Te mineralization, Acupan, Baguio District, Philippines: Numerical simulations of mineral deposition Econ. Geol. 96 2000 109-131
18. D.R. Cooke S.F. Simmons Characteristics and genesis of epithermal gold deposits In: S.G. Hagemann P.E. Brown (Eds.) Gold 2000 Rev. Econ. Geol. vol. 13 2000 221-244
19. H. Craig Isotopic variations in meteoric waters Science 133 1961 1702-1703
20. 3He and mantle volatiles in the ocean and the ocean crust In: C. Emiliani (Ed.) The Sea; Ideas and Observations on Progress in the Study of the Seas 1981 Wiley New York 391-428
21. C.G. Cunningham Pressure gradients and boiling as mechanisms for localizing ore in porphyry systems U.S. Geol. Surv. J. Res. 6 1978 745-754
22. C.G. Cunningham R.O. Rye T.A. Steven H.H. Mehnert Origins and exploration significance of replacement and vein-type alunite deposits in the Marysvale volcanic field, west central Utah Econ. Geol. 79 1984 50-71
23. C.G. Cunningham R.O. Rye P.M. Bethke M.A.V. Logan Formation of coarse-grained vein alunite by degassing of an epizonal stock Chapman Conference on Crater Lakes, Terrestrial Degassing and Hyper-Acid Fluids in the Environment, Extended Abstracts. Sept. 4-9, 1996, Crater Lake, Oregon 1996 Am. Geophys. Union Washington, DC 27
24. J.A. Deen R.O. Rye J.L. Munoz J.W. Drexler The magmatic-hydrothermal system at Julcani, Peru: Evidence from fluid inclusions and hydrogen and oxygen isotopes Econ. Geol. 89 1994 1924-1938
25. Deyell C.L. 2001 Alunite and high sulfidation Au-Ag-Cu mineralization in the El Indio-Pascua Belt, Chile-Argentina PhD thesis, Univ. British Columbia, Vancouver, Canada
26. C.L. Deyell T. Bissig R.O. Rye Isotopic evidence for magmatic-dominated epithermal processes in the El Indio-Pascua Au-Cu-Ag belt and relationship to geomorphologic settings Econ. Geol. Spec. Publ. 11 2004 55-73
27. S.W. Ebert R.O. Rye Secondary precious metal enrichment by steam-heated fluids in the Crowfoot-Lewis hotspring gold-silver deposit and relation to paleoclimate Econ. Geol. 92 1997 578-600
28. F.R. Flynn C.W. Burnham An experimental determination of rare earth partition coefficients between a chloride-containing vapor phase and silicate melts Geochim. Cosmochim. Acta 42 1978 685-701
29. R.O. Fournier The porphyry copper deposit exposed in the Liberty open-pit mine near Ely, Nevada: Part I. Syngenetic formation Econ. Geol. 62 1967 57-81
30. R.O. Fournier Conceptual models of brine evolution in magmatic-hydrothermal systems U.S. Geol. Surv. Prof. Pap. 1350 2 1987 1487-1506
31. R.O. Fournier Hydrothermal processes related to movement of fluid from plastic into brittle rock in the magmatic-hydrothermal environment Econ. Geol. 94 1999 1193-1212
32. P. Fulignati A. Gioncada A. Sbrana Rare-earth element behaviour in the alteration facies of the active magmatic-hydrothermal systems of Vulcano (Aeolian Islands, Italy) J. Volcanol. Geotherm. Res. 88 1999 325-342
33. T.M. Gerlach Oxygen buffering of Kilauea volcanic gases and the oxygen fugacity of Kilauea basalt Geochim. Cosmochim. Acta 57 1993 795-814
34. E.K. Gerling B.A. Mamyrin I.N. Tolstikhin Helium isotope composition in some rocks Geochem. Int. 8 1971 755-761
35. A. Gieseman H.J. Jager A.L. Norman H.R. Krouse W.A. Brand On-line sulfur-isotope determination using and elemental analyzer coupled to a mass spectrometer Anal. Chem. 66 1994 2816-2819
36. F. Gibert M.L. Pascal M. Pichavant Gold solubility and speciation in hydrothermal solutions: Experimental study of the stability of hydrosulfide complex of gold (AuHS°) at 350 to 450 °C and 500 bars Geochim. Cosmochim. Acta 62 1998 2931-2947
37. W.F. Giggenbach Magma degassing and mineral deposition in hydrothermal systems along convergent plate boundaries Econ. Geol. 87 1992 1927-1944
38. J.D. Godfrey The deuterium content of natural waters and other substances Geochim. Cosmochim. Acta 27 1962 43-52
39. S. Gordon B.J. McBride Computer program for calculation of complex chemical equilibrium compositions and applications: I. Analysis NASA Ref. Publ. 1311 1994 55 pp.
40. J.R. Graney S.E. Kesler Gas composition of inclusion fluid in ore deposits: Is there a relation to magmas? In: J.F.H. Thompson (Ed.) Magmas, Fluids, and Ore Deposits Mineral. Assoc. Can. Short Course vol. 23 1995 221-246
41. J.R. Graney S.E. Kesler Factors affecting gas analysis of inclusion fluid by quadrupole mass spectrometry Geochim. Cosmochim. Acta 59 1995 3977-3986
42. J. Guha L.Z. Lu M. Gagnon Gas composition of fluid inclusions using solid probe mass spectrometry and its application to study of mineralizing processes Geochim. Cosmochim. Acta 54 1990 553-558
43. L.B. Gustafson J.P. Hunt The porphyry copper deposit at El Salvador, Chile Econ. Geol. 70 1975 857-912
44. Heather K.B. Diaz D. 2000 El Indio-Tambo District regional geological mapping program 1997-1999, Barick Chile, Internal company report, 2 Vol., La Serena, Chile
45. J.W. Hedenquist J.B. Lowenstern The role of magmas in the formation of hydrothermal ore deposits Nature 370 1994 519-527
46. J.W. Hedenquist Y. Matsuhisa E. Izawa N.C. White W.F. Giggenbach M. Aoki Geology, geochemistry, and origin of high sulfidation Cu-Au mineralization in the Nansatsu District, Japan Econ. Geol. 89 1994 1-30
47. C.A. Heinrich C.G. Ryan T.P. Mernagh P.J. Eadington Segregation of ore metals between magmatic brine and vapor: A fluid inclusion study using PIXE microanalysis Econ. Geol. 87 1992 1566-1583
48. C.A. Heinrich D. Gunther A. Audétat T. Ulrich R. Frischknecht Metal fractionation between magmatic brine and vapor, determined by microanalysis of fluid inclusions Geology 27 1999 755-758
49. J.J. Hemley P.B. Hostetler A.J. Gude W.T. Mountjoy Some stability relations of alunite Econ. Geol. 64 1969 599-612
50. R.W. Henley Solubility of gold in hydrothermal chloride solutions Chem. Geol. 11 1973 73-87
51. R.W. Henley M.K. Stewart Chemical and isotopic changes in the hydrology of the Tauhara geothermal field due to exploitation at Wairakei J. Volcanol. Geotherm. Res. 15 1983 285-314
52. H.D. Holland Some applications of thermochemical data to problems of ore deposits: II. Mineral assemblages and the compositions of ore-forming fluids Econ. Geol. 60 1965 1101-1166
53. S. Hopf Behavior of rare earth elements in geothermal systems of New Zealand J. Geochem. Explor. 47 1993 333-357
54. J.L. Jambor Nomenclature of the alunite supergroup Can. Mineral. 37 1999 1323-1341
55. Jannas R.R. 1995. Reduced and oxidized high sulfidation deposits of the El Indio deposit, Chile PhD thesis, Harvard Univ., Cambridge, MA
56. R.R. Jannas T.S. Bowers U. Petersen R.E. Beane High-sulfidation deposit types in the El Indio District, Chile In: B.J. Skinner (Ed.) Geology and Ore Deposits of the Central Andes Soc. Econ. Geol. Spec. Pub. vol. 7 1999 27-59
57. B.M. Kennedy H. Hiyagon J.H. Reynolds Crustal neon: A striking uniformity Earth Planet. Sci. Lett. 98 1990 277-286
58. 18O measurement of organic and inorganic substances Rapid Commun. Mass Spectrom. 13 1999 1685-1693
59. G.P. Landis A.H. Hofstra Fluid inclusion gas chemistry as a potential mineral exploration tool: Case studies from Creede, CO, Jerrit Canyon, NV, Coeur d'Alene district, ID and MT, southern Alaska epithermal veins, and mid-continent MVT's J. Geochem. Explor. 42 1991 25-60
60. G.P. Landis R.O. Rye Characterization of gas chemistry and noble-gas isotopic ratios of inclusion fluids in magmatic-hydrothermal environments Chem. Geol. 215 2005 155-184
61. A.J. Lewis M.R. Palmer N.C. Sturchio A.J. Kemp The rare earth element geochemistry of acid-sulphate and acid-sulphate-chloride geothermal systems from Yellowstone National Park, Wyoming, USA Geochim. Cosmochim. Acta 61 1997 695-706
62. A.J. Lewis A. Komminou B.W.D. Yardley M.R. Palmer Rare earth element speciation in geothermal fluids from Yellowstone National Park, Wyoming, USA Geochim. Cosmochim. Acta 62 1998 657-663
63. G. Li D.R. Peacor E.J. Essene D.R. Brosnahan R.E. Beane Walthierite and huangite, two new minerals of the alunite group from the Coquimbo region, Chile Am. Mineral. 77 1992 1275-1284
64. S.E. Lindaas B.A. Chomiak A.R. Campbell D.I. Norman Enargite-hosted fluid inclusion gases from the Lepanto, Philippines, high-sulfidation Cu-Au deposit Geol. Soc. Am. Abstr. Programs 30 7 1998 20
65. B.J. Lottermoser Rare earth elements and hydrothermal ore formation processes Ore Geol. Rev. 7 1992 25-41
66. R.R. Loucks J.A. Mavrogenes Gold solubility in supercritical hydrothermal brines measured in synthetic fluid inclusions Science 284 1999 2159-2163
67. J.B. Lowenstern G.A. Mahood M.L. Rivers S.R. Sutton Evidence for extreme partitioning of copper into a magmatic vapor phase Science 257 1991 1405-1409
68. J.E. Lupton Terrestrial inert gases: Isotope tracer studies and clues to primordial components in the mantle Ann. Rev. Earth Sci. 11 1983 371-414
69. V. Maksaev R. Moscoso C. Mpodozis C. Nasi Las unidades volcánicas y plutonicas del cenozoico superior en la Alta Cordillera del Norte Chico (29°-31° S): Geología, alteración hidrothermal y mineralisacion Rev. Geol. Chile 21 1984 11-51
70. B.A. Mamyrin G.S. Anufriev I.L. Kamenski I.N. Tolstikhin Determination of the isotopic composition of atmospheric helium Geochem. Int. 7 1969 498-505
71. M. Martin J. Clavero C. Mpodozis Estudio geologico regional del Franja El Indio, Cordillera de Coquimbo 1995 Servicio National de Geología y Minería Santiago, Chile Registered report IR-95-06, 232 pp.
72. M.W. Martin J.R. Clavero C.M. Mpodozis Eocene to Late Miocene magmatic development of the El Indio belt, ∼30 °S, north-central Chile Congreso Geol. Chileno, VIII, Concepción Chile, Actas vol. 1 1997 149-153
73. M.W. Martin J.R. Clavero C. Mpodozis Late Paleozoic to Early Jurassic tectonic development of the high Andean Principal Cordillera, El Indio Region, Chile (29-30°S) J. South Am. Earth Sci. 12 1999 33-49
74. B. Marty Neon and xenon isotopes in MORB: Implications for the earth-atmosphere evolution Earth Planet. Sci. Lett. 94 1989 45-56
75. B.J. McBride S. Gordon Computer program for calculation of complex chemical equilibrium compositions and applications: II. Users manual and program description NASA Ref. Publ. 1996 1311
76. A. Michard Rare earth element systematics in hydrothermal fluids Geochim. Cosmochim. Acta 53 1989 745-750
77. P. Morrison J. Pine Radiogenic origin of the helium isotopes in rock N.Y. Acad. Sci., Ann. 62 1955 71-92
78. J.L. Muntean M.T. Einaudi Porphyry gold deposits of the Refugio district, Maricunga belt, northern Chile Econ. Geol. 95 2000 1445-1472
79. J.L. Muntean M.T. Einaudi Porphyry-epithermal transition: Maricunga belt, northern Chile Econ. Geol. 96 2001 743-772
80. H. Ohmoto A.C. Lasaga Kinetics of reactions between aqueous sulfates and sulfides in hydrothermal systems Geochim. Cosmochim. Acta 46 1982 1727-1746
81. M. Ozima F.A. Podosek Noble Gas Geochemistry 2002 Cambridge Univ. Press Cambridge, UK
82. Petersen E.U. Thompson A.J.B. 1992 Analysis of alunite and other thermally sensitive minerals. Microprobe Analyst (Internal report, Dep. Geol. Geophys., Univ. Utah), April, pp. 2-6
83. 18O relations in alunite mineral: potential single mineral thermometer Geol. Soc. Am. Abstr. Programs 17 7 1985 686
84. R. Poreda F. Radicati di Brozolo Neon in mid-Atlantic ridge basalts Earth Planet. Sci. Lett. 69 1984 277-289
85. J.L. Pouchou F. Pichoir PAP (ρZ) procedure for improved quantitative microanalysis Microbeam Anal. 1985 1985 104-106
86. V.A. Ramos K.S. Mahlburg R.N. Page F. Munizaga La ignimbrita Vacas Heladas y el cese del volcanismo en el Valle del Cura, Provincia de San Juan Rev. Asoc. Geol. Argent. 44 1989 336-352
87. Reed M.J. 1995 Distribution of rare earth elements between aqueous fluids and granitic melt PhD thesis, Univ. Maryland at College Park
88. R.O. Rye The evolution of magmatic fluids in the epithermal environment: the stable isotope perspective Econ. Geol. 88 1993 733-753
89. R.O. Rye A review of the stable-isotope geochemistry of sulfate minerals in selected igneous environments and related hydrothermal systems Chem. Geol. 215 2005 5-36 this volume
90. R.O. Rye R.E. Stoffregen P.M. Bethke Stable isotope systematics and magmatic hydrothermal processes in the Summitville, CO, gold deposit U.S. Geol. Surv. Open-File 1990 90-626
91. R.O. Rye P.M. Bethke M.D. Wasserman The stable isotope geochemistry of acid sulfate alteration Econ. Geol. 87 1992 225-262
92. 39Ar systematics of intralaboratory standard MAC-83 biotite. Radiogenic age and isotopic studies: Report 12 Geol. Surv. Can. Current Res. 1999-F 1999 13-26
93. S.M. Savin S. Epstein The oxygen and hydrogen isotope geochemistry of clay minerals Geochim. Cosmochim. Acta 34 1970 24-42
94. R. Schoen D. White J.J. Hemley Argillization by descending acid at steamboat springs, Nevada Clays Clay Miner. 22 1974 1-22
95. R.G. Schwab H. Herold C. Gotz N.P. de Oliveira Compounds of the crandallite type: Synthesis and properties of pure rare earth element phosphates Neues Jahrb. Mineral. 1990 241-254
96. T.M. Seward Thio complexes of gold and the transport of gold in hydrothermal ore solutions Geochim. Cosmochim. Acta 37 1973 379-399
97. T.J. Shepherd A.H. Rankin Fluid inclusion techniques of analysis In: J.P. Richards P.B. Larson (Eds.) Techniques in Hydrothermal Ore Deposits Geology Rev. Econ. Geol. vol. 10 1998 125-150
98. H. Shinohara Exsolution of immiscible vapor and liquid phases from a crystallizing silicate melt: Implications for chlorine and metal transport Geochim. Cosmochim. Acta 58 1994 5215-5221
99. G. Siddeley R. Areneda Gold-silver occurrences of the El Indio belt, Chile In: G.E. Ericksen M.T. Pinochet J.A. Reinemund (Eds.) Geology of the Andes and Its Relation to Hydrocarbon and Mineral Resources. Circum-Pacific Council for Energy and Mineral Resources Earth Science Series 1985 273-284
100. R.H. Sillitoe Styles of high sulfidation gold, silver and copper mineralization in the porphyry and epithermal environments PACRIM '99 congress. Bali Indonesia, 10-13 October Proc.-Australas. Inst. Min. 1999 29-44
101. R.H. Steiger E. Jaèger Subcommission on geochronology: Convention on the use of decay constants in geo- and cosmochronology Earth Planet. Sci. Lett. 36 1977 359-362
102. T.A. Steven J.C. Ratté Geology of ore deposits of the Summitville district, San Juan Mountains, Colorado U.S. Geol. Surv. Prof. 1960 343
103. R.E. Stoffregen Genesis of acid-sulfate alteration and Au-Cu-Ag mineralization at Summitville, Colorado Econ. Geol. 82 1987 1575-1591
104. R.E. Stoffregen C.N. Alpers Woodhouseite and svanbergite in hydrothermal ore deposits: Products of apatite destruction during advanced argillic alteration Can. Mineral. 25 1987 201-211
105. R.E. Stoffregen G. Cygan An experimental study of Na-K exchange between alunite and aqueous sulfate solutions Am. Mineral. 75 1990 209-220
106. 18O-16O and D-H fractionation factors between alunite and water at 250-450 °C Geochim. Cosmochim. Acta 58 1994 903-916
107. B.E. Taylor Magmatic volatiles: Isotopic variation of C, H, S In: J.W. Valley H.P. Taylor Jr. J.R. O'Neil (Eds.) Stable Isotopes in High Temperature Geological Processes Rev. Mineral. vol. 16 1986 185-225
108. B.E. Taylor Degassing of rhyolitic magmas: Hydrogen isotope evidence and implications for magmatic-hydrothermal ore deposits Can. Inst. Min. Metall. Spec. 39 1988 33-49
109. B.E. Taylor Degassing of Obsidian Dome rhyolite, Inyo volcanic chain, California In: H.P. Taylor Jr. J.R. O'Neil I.R. Kaplan (Eds.) Stable Isotope Geochemistry: A Tribute to Samuel Epstein Geochem. Soc. Spec. Pub. vol. 3 1991 339-353
110. A.J.B. Thompson Alunite compositions and textures: Relationships to precious metal mineralization Mineral Deposit Research Unit Short Course #8: New Developments in Lithogeochemistry 1992 University of British Columbia Vancouver, Canada
111. A.J.B. Thompson P.L. Hauff A.J. Robitaille Alteration mapping in exploration: Application of short-wave infrared (SWIR) spectroscopy Soc. Econ. Geol. Newsl. 39 1999 13 Oct.
112. A.H. Truesdell M. Nathenson R.O. Rye The effects of boiling and dilution on the isotopic compositions of Yellowstone thermal waters J. Geophys. Res. 82 1977 3694-3704
113. T. Ulrich D. Gunther C.A. Heinrich Gold concentrations of magmatic brines and the metal budget of porphyry copper deposits Nature 399 1999 676-679
114. T.W. Venneman J.L. Muntean S.E. Kesler J.R. O'Neil J.W. Valley N. Russell Stable isotope evidence for magmatic fluids in the Pueblo Viejo epithermal acid sulfate Au-Ag deposit, Dominican Republic Econ. Geol. 88 1993 55-71
115. M.D. Wasserman R.O. Rye P.M. Bethke A. Arribas Jr. Methods for separation and total stable isotope analysis of alunite U.S. Geol. Survey. Open-File Rep. 1992 92-99
116. Y. Watanabe J.W. Hedenquist Mineralogic and stable isotope zonation at surface over the El Salvador Porphyry Copper Deposit, Chile Econ. Geol. 96 2001 1775-1798
117. T.J. Williams P.A. Candela P.M. Piccoli The partitioning of copper between silicate melts and two-phase aqueous fluids: An experimental investigation at 1 kbar, 800 °C and 0.5 kbar, 850 °C Contrib. Mineral. Petrol. 121 1995 388-399
118. S.A. Wood The aqueous geochemistry of the rare-earth elements and yttrium: 1. Review of available low-temperature data for inorganic complexes and the inorganic REE speciation of natural waters Chem. Geol. 82 1990 159-186
119. S.A. Wood The aqueous geochemistry of the rare-earth elements and yttrium: 2. Theoretical predictions of speciation in hydrothermal solutions to 350 °C at saturation water vapor pressure Chem. Geol. 88 1990 99-125
120. D.R. Zimbelman R.O. Rye G. Breit Origin of secondary sulfate minerals on active andesitic stratovolcanoes Chem. Geol. 215 2005 37-60 this volume