Subsea-floor replacement in volcanic-hosted massive sulfide deposits

Abstract Recent research on volcanic-hosted massive sulfide (VMS) deposits indicates that syngenetic subsea-floor replacement ores form an important component of many deposits. In the context of VMS deposits, subsea-floor replacement can be defined as the syn-volcanic formation of sulfide minerals within pre-existing volcanic or sedimentary deposits by infiltration and precipitation in open spaces (fractures, inter- and intra-granular porosity) as well as replacement of solid materials. There are five criteria for distinguishing subsea-floor replacement in massive sulfide deposits: (1) mineralized intervals are enclosed within rapidly emplaced volcanic or sedimentary facies (lavas, intrusions, subaqueous mass-flow deposits, pyroclastic fallout); (2) relics of the host facies occur within the mineral deposit; (3) replacement fronts occur between the mineral deposit and the host lithofacies; (4) the mineral deposit is discordant to bedding; and (5) strong hydrothermal alteration continues into the hanging wall without an abrupt break in intensity. Criteria 1–3 are diagnostic of replacement, whereas criteria 4 and 5 may suggest replacement but are not alone diagnostic. Because clastic sulfide ores contain accessory rock fragments collected by the parent sediment gravity flow(s) during transport, criteria 2 can only be applied to massive, semi-massive, disseminated or vein style deposits, and not clastic ores. The spectrum of VMS deposit types includes deposits that have accumulated largely subsea-floor, and others in which sedimentation and volcanism were synchronous with hydrothermal activity, and precipitation of sulfides occurred at and below the sea floor over the life of the hydrothermal system. Deposits that formed largely subsea-floor are mainly hosted by syn-eruptive or post-eruptive volcaniclastic facies (gravity flow deposits, water-settled fall, autoclastic breccia). However, some subsea-floor replacement VMS deposits are hosted by lavas and syn-volcanic intrusions (sills, domes, cryptodomes). Burial of sea-floor massive sulfide by lavas or sediment gravity flow deposits can interrupt sea-floor mineralization and promote subsea-floor replacement and zone-refining. The distance below the sea floor at which infiltration and replacement took place is rarely well constrained, with published estimates ranging from less than 1 to more than 500 m, but mainly in the range 10–200 m. The upper few tens to hundreds of metres in the volcano-sedimentary pile are the favoured position for replacement, as clastic facies are wet, porous and poorly consolidated in this zone, and at greater depths become progressively more compacted, dewatered, altered, and less amenable to large scale infiltration and replacement by hydrothermal fluids. Furthermore, sustained mixing between the upwelling hydrothermal fluid and cold seawater is regarded as a major cause of sulfide precipitation in VMS systems, and this mixing process generally becomes less effective with increasing depth in the volcanic pile. The relative importance of subsea-floor replacement in VMS systems is related principally to four factors: the permeability and porosity patterns of host lithofacies, sedimentation rate, the relative ease of replacement of host lithofacies (especially glassy materials) and early formed alteration minerals during hydrothermal attack, and physiochemical characteristics of the hydrothermal fluid.

[1]  K. Goodman,et al.  Deep bacterial biosphere in Pacific Ocean sediments , 1994, Nature.

[2]  R. Sáez,et al.  Geological constraints on massive sulphide genesis in the Iberian Pyrite Belt , 1996 .

[3]  C. J. Bray,et al.  Origin of the Eskay Creek precious metal-rich volcanogenic massive sulfide deposit; fluid inclusion and stable isotope evidence , 1999 .

[4]  A. Hill.  Structure, volcanic setting, hydrothermal alteration and genesis of the Thalanga massive sulphide deposit , 1996 .

[5]  W. Herrmann,et al.  The Origin of Chlorite-Tremolite-Carbonate Rocks Associated with the Thalanga Volcanic-Hosted Massive Sulfide Deposit, North Queensland, Australia , 2001 .

[6]  R. Large,et al.  The volcanogenic sulfide ores at Mount Chalmers, eastern Queensland , 1980 .

[7]  M. Hannington,et al.  Volcanic Associated Massive Sulfide Deposits: Processes and Examples in Modern and Ancient Settings , 1997 .

[8]  A. Boyle,et al.  Deformation and metamorphism of massive sulphides at Sulitjelma, Norway , 1993, Mineralogical Magazine.

[9]  T. Callaghan.  Geology and Host-Rock Alteration of the Henty and Mount Julia Gold Deposits, Western Tasmania , 2001 .

[10]  R. Haymon,et al.  Fossils of Hydrothermal Vent Worms from Cretaceous Sulfide Ores of the Samail Ophiolite, Oman , 1984, Science.

[11]  J. McPhie,et al.  Facies architecture of mineralized submarine volcanic sequences; Cambrian Mount Read Volcanics, western Tasmania , 1992 .

[12]  J. Walshe,et al.  The formation of the volcanic-hosted massive sulfide ore deposit at Rosebery, Tasmania , 1981 .

[13]  S. Liaghat,et al.  The Key Tuffite, Matagami mining district; origin of the tuff components and mass changes , 1992 .

[14]  C. Spence.  Volcanogenic features of the Vauze sulfide deposit, Noranda, Quebec , 1975 .

[15]  H. Gibson,et al.  Submarine Volcanic Processes, Deposits, and Environments Favorable for the Location of Volcanic-Associated Massive Sulfide Deposits , 1997 .

[16]  D. Groves,et al.  3.26 Ga black smoker-type mineralization in the Strelley Belt, Pilbara Craton, Western Australia , 1995, Journal of the Geological Society.

[17]  R. Allen,et al.  Facies analysis of a 1.9 Ga, continental margin, back-arc, felsic caldera province with diverse Zn-Pb-Ag-(Cu-Au) sulfide and Fe oxide deposits, Bergslagen region, Sweden , 1996 .

[18]  D. Clague,et al.  Mineralogy and chemistry of massive sulfide deposits from the Juan de Fuca Ridge , 1984 .

[19]  C. V. Raman,et al.  Active and relict sea-floor hydrothermal mineralization at the TAG hydrothermal field, Mid-Atlantic Ridge , 1993 .

[20]  W. Goodfellow,et al.  Geology, mineralogy, and chemistry of sediment-hosted clastic massive sulfides in shallow cores, Middle Valley, northern Juan de Fuca Ridge , 1993 .

[21]  P. Williams,et al.  Structure, origin, and concentration of the Brunswick 12 and 6 orebodies , 1984 .

[22]  R. Cox,et al.  The Wilga base‐precious metals deposit, Benambra, Victoria, Australia , 1990 .

[23]  P. Morant.  Panorama zinc-copper deposits , 1998 .

[24]  M. Doyle.  Volcanic Influences on Hydrothermal and Diagenetic Alteration: Evidence from Highway-Reward, Mount Windsor Subprovince, Australia , 2001 .

[25]  R. Bevins.  Metallogeny of Basic and Ultrabasic Rocks , 1987, Mineralogical Magazine.

[26]  D. Huston.  The stratigraphic and structural setting of the Balcooma volcanogenic massive sulphide lenses, northern Queensland , 1990 .

[27]  John C. Waters,et al.  Volcanology and sedimentology of the host succession to the Hellyer and Que River volcanic-hosted massive sulfide deposits, northwestern Tasmania , 1992 .

[28]  P. Barton.  Some ore textures involving sphalerite from the Furutobe mine, Akita Prefecture, Japan. , 1978 .

[29]  B. Spiro,et al.  The Filon Norte orebody (Tharsis, Iberian Pyrite Belt): a proximal low-temperature shale-hosted massive sulphide in a thin-skinned tectonic belt , 1997 .

[30]  G. Doiron,et al.  Volcanological Reconstruction of the Corbet Breccia Pile, and Cu-Zn Massive Sulfide Deposit, Noranda, Quebec. , 1993 .

[31]  W. Binney.  A Sedimentological Investigation of Maclean Channel Transported Sulphide Ores , 1987 .

[32]  C. Stanley.  Mineral deposits : processes to processing , 1989 .

[33]  Yoichi Sato,et al.  Recent exploration of the Fukazawa kuroko deposits and some interesting modes of occurrence of the ores , 1979 .

[34]  A. Taube,et al.  Stratigraphy, structure, and volcanic-hosted mineralization of the Mount Windsor Subprovince, North Queensland, Australia , 1992 .

[35]  K. D. Corbett.  New Mapping and Interpretations of the Mount Lyell Mining District, Tasmania: A Large Hybrid Cu-Au System with an Exhalative Pb-Zn Top , 2001 .

[36]  S. Eggins,et al.  Geochemical Anatomy of Silica Iron Exhalites: Evidence for Hydrothermal Oxyanion Cycling in Response to Vent Fluid Redox and Thermal Evolution (Mt. Windsor Subprovince, Australia) , 2001 .

[37]  R. Large,et al.  Cambrian microbial and silica gel textures in silica iron exhalites from the Mount Windsor volcanic belt, Australia; their petrography, chemistry, and origin , 1992 .

[38]  W. Seyfried,et al.  Mineralization, alteration, and hydrothermal metamorphism of the ophiolite-hosted Turner-Albright sulfide deposit, southwestern Oregon , 1988 .

[39]  H. Paulick,et al.  Facies architecture of the felsic lava‐dominated host sequence to the Thalanga massive sulfide deposit, Lower Ordovician, northern Queensland* , 1999 .

[40]  S. Halley,et al.  Henty; a shallow-water gold-rich volcanogenic massive sulfide deposit in western Tasmania , 1997 .

[41]  J. Gemmell,et al.  The Archean Cu-Zn Magnetite-Rich Gossan Hill Volcanic-Hosted Massive Sulfide Deposit, Western Australia: Genesis of a Multistage Hydrothermal System , 2002 .

[42]  R. Allen.  Reconstruction of the tectonic, volcanic, and sedimentary setting of strongly deformed Zn-Cu massive sulfide deposits at Benambra, Victoria , 1992 .

[43]  G. Einsele.  Interaction between sediments and basalt injections in young Gulf of California-type spreading centers , 1986 .

[44]  J. Franklin,et al.  The early development of an Archean submarine caldera complex with emphasis on the Mattabi ash-flow tuff and its relationship to the Mattabi massive sulfide deposit , 1991 .

[45]  M. Marani,et al.  Shallow-water polymetallic sulfide deposits in the Aeolian island arc , 1997 .

[46]  Peter A. Rona,et al.  Hydrothermal mineralization at seafloor spreading centers , 1984 .

[47]  D. Patterson,et al.  A comparison of the geology and mineralization of the Balcooma and Dry River South volcanogenic massive sulfide deposits, northern Queensland , 1992 .

[48]  B. Skinner,et al.  Mineral textures and their bearing on formation of the kuroko orebodies , 1983 .

[49]  J. Gemmell,et al.  Alteration Characteristics of the Archean Golden Grove Formation at the Gossan Hill Deposit, Western Australia: Induration as a Focusing Mechanism for Mineralizing Hydrothermal Fluids , 2001 .

[50]  Toshio Takahashi,et al.  Volcanic-Sedimentary Features in the Matsumine "Kuroko" Deposits, Hanaoka Mine , 1972 .

[51]  D. Berkman,et al.  Geology of Australian and Papua New Guinean mineral deposits , 1998 .

[52]  M. Perfit,et al.  UNUSUAL FORMS OF AMORPHOUS SILICA FROM SUBMARINE WARM SPRINGS, JUAN DE FUCA RIDGE. NORTHEASTERN PACIFIC OCEAN* , 1999 .

[53]  Matthew C. Smith,et al.  Volcanic eruption of the mid-ocean ridge along the East Pacific Rise crest at 9°45-52'N: direct submersible observations of seafloor phenomena associated with an eruption event in April, 1991 , 1993 .

[54]  J. Gemmell,et al.  Geology, Genesis, and Exploration Implications of the Footwall and Hanging-Wall Alteration Associated with the Hellyer Volcanic-Hosted Massive Sulfide Deposit, Tasmania, Australia , 2001 .

[55]  R. Large,et al.  Stringer system and alteration zones underlying the Hellyer volcanogenic massive sulfide deposit, Tasmania, Australia , 1992 .

[56]  M. Mottl,et al.  43. TIMING OF ORE DEPOSITION AND SILL INTRUSION AT SITE 856: EVIDENCE FROM STRATIGRAPHY, ALTERATION, AND SEDIMENT PORE-WATER COMPOSITION1 , 1994 .

[57]  H. Gibson,et al.  A comparison of the Horne volcanogenic massive sulfide deposit and intracauldron deposits of the Mine Sequence, Noranda, Quebec , 1993 .

[58]  J. Edmond,et al.  The Genesis of Hot Spring Deposits on the East Pacific Rise, 21°N , 1983 .

[59]  Cc Gifkins,et al.  Textural and Chemical Characteristics of Diagenetic and Hydrothermal Alteration in Glassy Volcanic Rocks: Examples from the Mount Read Volcanics, Tasmania , 2001 .

[60]  D. Huston,et al.  Zonation of Alteration Facies at Western Tharsis: Implications for the Genesis of Cu-Au Deposits, Mount Lyell Field, Western Tasmania , 2001 .

[61]  R. Large,et al.  Distribution, mineralogy, and geochemistry of gold and silver in the north end orebody, Rosebery, Tasmania , 1988 .

[62]  M. Samant,et al.  Study by Synchrotron Radiation of the Structure of a Working Catalyst at High Temperatures and Pressures , 1985, Science.

[63]  A. Galley,et al.  Geological setting and hydrothermal evolution of the Chisel Lake and North Chisel Zn-Pb-Cu-Ag-Au massive sulfide deposits, Snow Lake, Manitoba , 1993 .

[64]  R. Sáez,et al.  Geology and genesis of the Aznalcóllar massive sulphide deposits, Iberian Pyrite Belt, Spain , 1997 .

[65]  D. Ayres.  The mineralogy and chemical composition of the Woodlawn massive sulphide orebody , 1979 .

[66]  S. Saif.  Petrographic and geochemical characteristics of iron-rich rocks and their significance in exploration for massive sulfide deposits, Bathurst, New Brunswick, Canada , 1983 .

[67]  J. Hallberg,et al.  Geologic setting of the Teutonic Bore massive sulfide deposit, Archean Yilgarn Block, Western Australia , 1985 .

[68]  R. Hazeldene,et al.  Woodlawn Zn-Pb-Cu sulfide deposit, New South Wales, Australia; an interpretation of ore formation from field observations and metal zoning , 1987 .

[69]  W. Vivallo.  The geology and genesis of the Proterozoic massive sulfide deposit at Garpenberg, central Sweden , 1985 .

[70]  J. McPhie,et al.  Facies architecture of a silicic intrusion-dominated volcanic centre at Highway-Reward, Queensland, Australia , 2000 .

[71]  Sulphide Mylonites from the Renström VMS Deposit, Northern Sweden , 1993 .

[72]  M. Barley.  A review of Archean volcanic-hosted massive sulfide and sulfate mineralization in Western Australia , 1992 .

[73]  J. Franklin,et al.  Two-fold classification of Archean volcanic-associated massive sulfide deposits , 1987 .

[74]  P. Ashley,et al.  The Scuddles Cu-Zn prospect, an Archean volcanogenic massive sulfide deposit, Golden Grove District, Western Australia , 1988 .

[75]  P. Weihed,et al.  Setting of Zn-Cu-Au-Ag massive sulfide deposits in the evolution and facies architecture of a 1.9 Ga marine volcanic arc, Skellefte District, Sweden , 1996 .

[76]  R. L. Bates,et al.  Glossary of Geology , 1987 .

[77]  W. Goodfellow,et al.  Mineralogy, bulk and rare earth element geochemistry of massive sulphide-associated hydrothermal sediments of the Brunswick Horizon, Bathurst Mining Camp, New Brunswick , 1996 .

[78]  H. Barnes,et al.  Mineralogy, Geochemistry, and Ore Genesis of Hydrothermal Sediments from the Atlantis II Deep, Red Sea , 1983 .

[79]  W. Herrmann,et al.  Hydrothermal Alteration and Volatile Element Halos for the Rosebery K Lens Volcanic-Hosted Massive Sulfide Deposit, Western Tasmania , 2001 .

[80]  R. Large.  Chemical evolution and zonation of massive sulfide deposits in volcanic terrains , 1977 .

[81]  R. Sainty.  Shallow-Water Stratigraphy at the Mount Chalmers Volcanic-Hosted Massive Sulfide Deposit, Queensland, Australia , 1992 .

[82]  W. Perkins.  Mount Isa silica dolomite and copper orebodies; the result of a syntectonic hydrothermal alteration system , 1984 .

[83]  T. Ulrich,et al.  Different mineralization styles in a volcanic-hosted ore deposit: the fluid and isotopic signatures of the Mt Morgan Au-Cu deposit, Australia , 2003 .

[84]  R. Large,et al.  The precious metal-rich South Hercules mineralization, Western Tasmania: a possible subsea-floor replacement volcanic-hosted massive sulfide deposit , 1992 .

[85]  A. Klaus,et al.  Proceedings of the Ocean Drilling Program, Scientific Results , 2001 .

[86]  G. Constantinou,et al.  Black smoker chimney fragments in Cyprus sulphide deposits , 1984, Nature.

[87]  Mark D. Hannington,et al.  Polymetallic massive sulfides at the modern seafloor A review , 1995 .

[88]  J. McPhie,et al.  Shallow‐water microbialite‐volcaniclastic facies association in the Cambro‐Ordovician Mt Windsor Subprovince, Australia , 2001 .

[89]  John V. Wright,et al.  Subaqueous pyroclastic flows and ignimbrites: an assessment , 1991 .

[90]  M. Tivey,et al.  Submersible investigation of an extinct hydrothermal system on the Galapagos Ridge; sulfide mounds, stockwork zone, and differentiated lavas , 1988 .

[91]  W. Goodfellow,et al.  Sulfide formation and hydrothermal alteration of hemipelagic sediment in Middle Valley, northern Juan De Fuca Ridge , 1988 .

[92]  Theodore A. DeMatties.  Early Proterozoic volcanogenic massive sulfide deposits in Wisconsin; an overview , 1994 .

[93]  A. Galley,et al.  The subsea-floor formation of volcanic-hosted massive sulfide; evidence from the Ansil Deposit, Rouyn-Noranda, Canada , 1995 .

[94]  D. Jack.  Hellyer host rock alteration , 1989 .

[95]  M. Hannington,et al.  The internal structure of an active sea-floor massive sulphide deposit , 1995, Nature.

[96]  R. Valenta,et al.  Primary and tectonic features of the Currawong Zn-Cu-Pb(-Au) massive sulfide deposit, Benambra, Victoria; implications for ore genesis , 1995 .

[97]  A. Taube.  The Mount Morgan gold-copper mine and environment, Queensland; a volcanogenic massive sulfide deposit associated with penecontemporaneous faulting , 1986 .

[98]  Ross R. Large,et al.  Australian volcanic-hosted massive sulfide deposits; features, styles, and genetic models , 1992 .

[99]  D. Aerden.  Foliation-boudinage control on the formation of the Rosebery PbZn orebody, Tasmania , 1991 .

[100]  W. Mueller,et al.  Alteration and ore mineral characteristics of the Archean Coniagas massive sulfide deposit, Abitibi belt, Quebec , 1998 .

[101]  J. F. Thompson,et al.  The Precious Metal-Rich Eskay Creek Deposit, Northwestern British Columbia , 1997 .

[102]  D. Huston,et al.  The subsea-floor replacement origin of the Ordovician Highway-Reward volcanic-associated massive sulfide deposit, Mount Windsor Subprovince, Australia , 1999 .

[103]  K. Zaw,et al.  Formation on the sea floor of the Hellyer volcanogenic massive sulfide deposit , 1997 .

[104]  M. Mottl,et al.  Geomicrobiology of Deep-Sea Hydrothermal Vents , 1985, Science.

[105]  U. Bergström,et al.  Geology, tectonic setting, and origin of the Paleoproterozoic Boliden Au-Cu-As deposit, Skellefte District, northern Sweden , 1996 .

[106]  J. Walshe,et al.  The formation of massive sulfide deposits on the sea floor , 1979 .

[107]  W. Mueller,et al.  Archean, deep-marine, volcanic eruptive products associated with the Coniagas massive sulfide deposit, Quebec, Canada , 1994 .

[108]  I. Jonasson,et al.  Two zinc-rich chimneys from the plume site, southern Juan de Fuca Ridge , 1988 .

[109]  M. D. Petersen,et al.  Mineralogical and chemical Zonation around the Woodlawn Cu‐Pb‐Zn ore deposit, Southeastern New South Wales , 1979 .

[110]  V. Peterson,et al.  Depositional setting and deformation of massive sulfide deposits, iron-formation, and associated alteration in the Manitouwadge greenstone belt, Superior Province, Ontario , 1995 .

[111]  M. Hannington,et al.  Setting and characteristics of ophiolite-hosted volcanogenic massive sulfide deposits , 1999 .