Abstract
The noble gas (Ar, Kr, Xe) and halogen (Cl, Br, I) composition of fluid inclusions in hydrothermal quartz and calcite related to the hypogene iron oxide-copper-gold (IOCG) mineralization at Mantoverde and Candelaria, Chile, have been investigated to provide new insights of fluid and salinity sources in Andean IOCG deposits. A combination of mechanical extraction by crushing and thermal decrepitation methods was applied and collectively indicate that fluid inclusions with salinities ranging from 3.4 up to 64 wt% NaCl equivalent have molar Br/Cl and I/Cl ratios of between 0.5 × 10−3 and 3.0 × 10−3 and I/Cl of between 8 × 10−6 and 25 × 10−6 in the majority of samples, with maximum values of 5.2 × 10−3 obtained for Br/Cl and 64 × 10−6 for I/Cl in fluid inclusions within individual samples. The fluid inclusions have age-corrected 40Ar/36Ar ratios ranging from the atmospheric value of 296 up to 490 ± 45, indicating the presence of crustal- or mantle-derived excess 40Ar in the fluid inclusions of most samples. The fluid inclusions have 84Kr/36Ar and 130Xe/36Ar ratios intermediate of air and air-saturated water. However, 40Ar/36Ar is not correlated with either 84Kr/36Ar or 130Xe/36Ar, and the fluid inclusion 36Ar concentrations of 0.2–3.5 × 10−10 mol/g (calculated from measured Cl/36Ar and thermometric salinity measurements) extend below the seawater value of 0.34 × 10−10 mol/g, suggesting that contamination with modern air is a minor artifact. The range of fluid inclusion Br/Cl and I/Cl ratios overlap those previously documented for the mantle and magmatic-hydrothermal ore deposits, and the fluids’ unusually low 36Ar concentration is consistent with the involvement of magmatic-hydrothermal fluids. Input of additional non-magmatic fluid components is suggested by the spread in Br/Cl and I/Cl to values characteristic of bittern brine sedimentary formation waters and near atmospheric 40Ar/36Ar. These data are compatible with mixing of magmatic-hydrothermal fluids and evaporated seawater, which was modified by interaction with back-arc basin sediments as the major control on ore formation. Low Br/Cl (<0.5 × 10−3) and I/Cl (<5.0 × 10−6) values that would provide evidence for evaporite dissolution as an important source of fluid salinity were not detected.
Similar content being viewed by others
Explore related subjects
Discover the latest articles, news and stories from top researchers in related subjects.References
AngloAmerican (2012) Annual report 2011. What it takes: “It takes all of us, using our knowledge, skills and expertise to deliver value.” Anglo American Plc., 226 p. http://www.angloamerican.com/~/media/Files/A/Anglo-American-Plc/reports/aa-ar2011.pdf
AngloAmerican (2014) 2013 Preliminary results. http://anglo-american-chile.production.investis.com/~/media/Files/A/Anglo-American-Chile/Attachments/pdf/pr2014-02-14-en.pdf
Baker T, Mustard R, Fu B, Williams PJ, Dong G, Fisher L, Mark G, Ryan CG (2008) Mixed messages in iron oxide–copper–gold systems of the Cloncurry district, Australia: insights from PIXE analysis of halogens and copper in fluid inclusions. Mineral Deposits 43:599–608
Banks DA, Green R, Cliff RA, Yardley BWD (2000) Chlorine isotopes in fluid inclusions: determination of the origins of salinity in magmatic fluids. Geochim Cosmochim Acta 64:1785–1789
Barton MD, Johnson DA (1996) Evaporitic-source model for igneous-related Fe oxide–(REE–Cu–Au–U) mineralization. Geology 24:259–262
Benavides J, Kyser TK, Clark AH, Oates CJ, Zamora R, Tarnovschi R, Castillo B (2007) The Mantoverde iron oxide-copper-gold district, III Región, Chile: the role of regionally derived, nonmagmatic fluids in chalcopyrite mineralization. Econ Geol 102:415–440
Berg K, Baumann A (1985) Plutonic and metasedimentary rocks from the coastal range of Northern Chile: Rb–Sr and U–Pb isotopic systematics. Earth Planet Sci Lett 75:101–115
Böhlke JK, Irwin JJ (1992) Laser microprobe analyses of Cl, Br, I, and K in fluid inclusions: implications for the sources of salinity in some ancient hydrothermal fluids. Geochim Cosmochim Acta 56:203–225
Brown M (1988) Geochemistry of the granitic complexes, 26–27°S, northern Chile. V. Congreso Geol Chil Actas 3:I153–I166
Brown M, Diaz F, Grocott J (1993) Displacement history of the Atacama fault system 25°00′ S–27°00′ S, Northern Chile. Geol Soc Am Bull 105:1165–1174
Chen H (2013) External sulphur in IOCG mineralization: implications on definition and classification of the IOCG clan. Ore Geol Rev 51:74–78
Chiaradia M, Banks D, Cliff R, Marschik R, de Haller A (2006) Origin of fluids in South American iron oxide-copper-gold deposits: indications from delta 37Cl, 87Sr/86Sr initial and Cl/Br. Mineral Deposits 41:565–573
Cline JS, Bodnar RJ (1991) Can economic porphyry copper mineralization be generated by a typical calc-alkaline melt? J Geophys Res Solid Earth Planets 96:8113–8126
Cornejo P, Matthews S, Orrego M, Robles W (2000) Etapas de mineralización asociadas a alteración potásica en un sistema de Fe-Cu-Au: yacimiento Mantoverde, III. Región de Atacama, Chile. 9th Congreso Geológico Chileno, Puerto Varas, Actas, p 97–101
Dallmeyer RD, Grocott J, Brown M, Taylor GK, Treloar PJ (1996) Mesozoic magmatic and tectonic events within the Andean plate boundary zone, 26°–27°30′ S, North Chile: constraints from 40Ar/39Ar mineral ages. J Geol 104:19–40
Fisher LA, Kendrick MA (2008) Metamorphic fluid origins in the Osborne Fe oxide–Cu–Au deposit, Australia: evidence from noble gases and halogens. Mineral Deposits 43:483–497
Freeport-McMoran (2014) Strength in resources: annual report, 136 p http://www.fcx.com/ir/AR/2013/FCX_AR_2013.pdf
Fu B, Williams PJ, Oliver NHS, Dong G, Pollard PJ, Mark GM (2003) Fluid mixing versus unmixing as an ore-forming process in the Cloncurry Fe-oxide–Cu–Au district, NW Queensland, Australia: evidence from fluid inclusions. J Geochem Explor 78–79:617–622
Gillen D (2010) A study of IOCG-related hydrothermal fluids in the Wernecke Mountains, Yukon Territory, Canada. PhD thesis, James Cook University, 408 p
Hartley AJ, Chong G, Houston J, Mather ME (2005) 150 million years of climate stability: evidence from the Atacama Desert, northern Chile. J Geol Soc Lond 162:421–424
Hopper D, Correa A (2000) The Panulcillo and Teresa de Colmo copper deposits: contrasting examples of Fe-ox Cu-Au mineralization from the coastal cordillera of Chile. In: Porter TM (ed) Hydrothermal iron-oxide copper-gold and related deposits: a global perspective. Australian Mineral Foundation, Adelaide, pp 177–189
Hu RZ, Burnard PG, Turner G, Bi XW (1998) Helium and argon isotope systematics in fluid inclusions of Machangqing copper deposit in west Yunnan Province, China. Chem Geol 146:55–63
Hu RZ, Burnard PG, Bi XW, Zhou MF, Pen JT, Su WC, Wu KX (2004) Helium and argon isotope geochemistry of alkaline intrusion-associated gold and copper deposits along the Red River-Jinshajiang fault belt, SW China. Chem Geol 203:305–317
Hunt JA, Baker T, Thorkelson D (2005) Regional-scale Proterozoic IOCG-mineralized breccia systems: examples from the Wernecke mountains, Yukon, Canada. Mineral Deposits 40:492–514
Irwin JJ, Roedder E (1995) Diverse origins of fluid inclusions at Bingham (Utah, USA), Butte (Montana, USA), St. Austell (Cornwall, UK) and Ascension Island (mid-Atlantic, UK), indicated by laser microprobe analysis of Cl, K, Br, I, Ba + Te, U, Ar, Kr, and Xe. Geochim Cosmochim Acta 59:295–312
Jambon A, Deruelle B, Dreibus G, Pineau F (1995) Chlorine and bromine abundance in MORB: the contrasting behaviour of the Mid-Atlantic Ridge and East Pacific Rise and implications for chlorine geodynamic cycle. Chem Geol 126:101–117
Kendrick MA (2012) High precision Cl, Br and I determination in mineral standards using the noble gas method. Chem Geol 292–293:116–126
Kendrick MA, Burnard P (2013) Noble gases and halogens in fluid inclusions: a journey through the Earth’s crust. In: Burnard P (ed) The noble gases as geochemical tracers. Springer, Berlin, pp 319–369
Kendrick MA, Burgess R, Pattrick RAD, Turner G (2001a) Fluid inclusion noble gas and halogen evidence on the origin of Cu-porphyry mineralising fluids. Geochim Cosmochim Acta 65:2651–2668
Kendrick MA, Burgess R, Pattrick RAD, Turner G (2001b) Halogen and Ar-Ar age determinations of inclusions within quartz veins from porphyry copper deposits using complementary noble gas extraction techniques. Chem Geol 177:351–370
Kendrick MA, Burgess R, Harrison D, Bjørlykke A (2005) Noble gas and halogen evidence on the origin of Scandinavian sandstone-hosted Pb-Zn deposits. Geochim Cosmochim Acta 69:109–129
Kendrick MA, Phillips D, Miller JML (2006a) Part I. Decrepitation and degassing behaviour of quartz up to 1560 C: analysis of noble gases and halogens in complex fluid inclusion assemblages. Geochim Cosmochim Acta 70:2540–2561
Kendrick MA, Miller JM, Phillips D (2006b) Part II: evaluation of 40Ar-39Ar quartz ages: implications for fluid inclusion retentivity and determination of initial 40Ar/36Ar values in Proterozoic samples. Geochim Cosmochim Acta 70:2562–2576
Kendrick MA, Mark G, Phillips D (2007) Mid-crustal fluid mixing in a Proterozoic Fe oxide–Cu–Au deposit, Ernest Henry, Australia: evidence from Ar, Kr, Xe, Cl, Br, and I. Earth Planet Sci Lett 256:328–343
Kendrick MA, Baker T, Fu B, Phillips D, Williams PJ (2008a) Noble gas and halogen constraints on regionally extensive mid-crustal Na–Ca metasomatism, the Proterozoic Eastern Mount Isa Block, Australia. Precambrian Res 163:131–150
Kendrick MA, Honda M, Gillen D, Baker T, Phillips D (2008b) New constraints on regional brecciation in the Wernecke mountains, Canada, from He, Ne, Ar, Kr, Xe, Cl, Br and I in fluid inclusions. Chem Geol 255:33–46
Kendrick MA, Phillips D, Wallace M, Miller JM (2011a) Halogens and noble gases in sedimentary formation waters and Zn-Pb deposits: a case study from the Lennard Shelf, Australia. Appl Geochem 26:2089–2100
Kendrick MA, Honda M, Oliver NHS, Phillips D (2011b) The noble gas systematics of late-orogenic H2O-CO2 fluids, Mt Isa, Australia. Geochim Cosmochim Acta 75:1428–1450
Kendrick MA, Kamenetsky VS, Phillips D, Honda M (2012a) Halogen systematics (Cl, Br, I) in Mid-Ocean Ridge Basalts: a Macquarie Island case study. Geochim Cosmochim Acta 81:82–93
Kendrick MA, Woodhead JD, Kamenetsky VS (2012b) Tracking halogens through the subduction cycle. Geology 40:1075–1078
Kendrick MA, Arculus RJ, Burnard P, Honda M (2013) Quantifying brine assimilation by submarine magmas: examples from the Galápagos spreading centre and Lau Basin. Geochim Cosmochim Acta 123:150–165
Lara L, Godoy E (1998) Hoja Quebrada salitrosa, III Región de Atacama. Servicio Nacional de Geología y Minería, Santiago, Chile, Mapas Geológicos 4, Escala 1:100.000
Lucassen F, Kramer W, Bartsch V, Wilke HG, Franz G, Romer RL, Dulski P (2006) Nd, Pb, and Sr isotope composition of juvenile magmatism in the Mesozoic large magmatic province of northern Chile (18–27°S): indications for a uniform subarc mantle. Contrib Mineral Petrol 152:571–589
Marschik R, Fontboté L (2001a) The Candelaria-Punta del Cobre iron oxide Cu-Au(-Zn-Ag) deposits, Chile. Econ Geol 96:1799–1826
Marschik R, Fontboté L (2001b) The Punta del Cobre Formation, Punta del Cobre-Candelaria area, Chile. J South Am Earxth Sci 14:401–433
Marschik R, Söllner F (2006) Early Cretaceous zircon U-Pb isotope ages for the Copiapó plutonic complex and implications for the IOCG mineralization at Candelaria, Atacama Region, Chile. Mineral Deposits 41:785–801
Marschik R, Singer BS, Munizaga F, Tassinari C, Moritz R, Fontboté L (1997) Age of Cu(-Fe)-Au mineralization and thermal evolution of the Punta del Cobre district, Chile. Mineral Deposits 32:531–546
Marschik R, Leveille RA, Martin W (2000) La Candelaria and the Punta del Cobre district, Chile: early cretaceous iron oxide Cu-Au(−Zn-Ag) mineralization. In: Porter TM (ed) Hydrothermal iron-oxide copper-gold & related deposits: a global perspective, vol 1. PGC Publishing, Adelaide, pp 163–175
Marschik R, Fontignie D, Chiaradia M, Voldet P (2003a) Geochemical and Nd-Sr-Pb-O isotope characteristics of granitoids of the early cretaceous Copiapó plutonic complex (27°30′S), Chile. J S Am Earth Sci 16:381–398
Marschik R, Chiaradia M, Fontboté L (2003b) Implications of Pb isotope signatures of rocks and iron oxide Cu-Au ores in the Candelaria-Punta del Cobre district, Chile. Mineral Deposits 38:900–912
Marshall LJ, Oliver NHS (2006) Monitoring fluid chemistry in iron oxide copper-gold-related metasomatic processes, Eastern Mt Isa block Australia. Geofluids 6:45–66
Marshall LJ, Oliver NHS (2007) Constraints on hydrothermal fluid pathways within Mary Kathleen group stratigraphy of the Cloncurry iron-oxide–copper–gold District, Australia. Precambrian Res 163:151–158
Mathur R, Marschik R, Ruiz J, Munizaga F, Leveille RA, Martin W (2002) Age of mineralization of the Candelaria iron oxide Cu-Au deposit, and the origin of the Chilean Iron Belt based on Re-Os isotopes. Econ Geol 97:59–71
McCaffrey MA, Lazar B, Holland HD (1986) The evaporation path of seawater and the composition of Br− and K+ with halite. J Sediment Petrol 57:928–937
McDougall I, Harrison TM (1999) Geochronology and thermochronology by the 40Ar/39Ar method. Oxford University Press, New York, p 269
McNutt RH, Crockett JH, Clark AH, Caelles JC, Farrar E, Haynes SJ, Zentilli M (1975) Initial 87Sr/86Sr ratios of plutonic and volcanic rocks of the Central Andes between latitudes 26–29°S. Earth Planet Sci Lett 27:303–313
CAP Mineria (2012) Memoria annual 2011. Compañia Acero del Pacífico, 97 p. http://www.capmineria.cl/wp-content/uploads/2012/03/cap_mineria_memoria_2011.pdf
Morata D, Aguirre L (2003) Extensional lower cretaceous volcanism in the Coastal Range (29°20′–30°S), Chile: geochemistry and petrogenesis. J Am Earth Sci 16:459–476
Nier AO (1950) A redetermination of the relative abundances of the isotopes of carbon, nitrogen, oxygen, argon, and potassium. Phys Rev 77:789–793
Oliver NHS, Cleverley JS, Mark G, Pollard PJ, Fu B, Marshall LJ, Rubenach MJ, Williams PJ, Baker T (2004) Modeling the role of sodic alteration in the genesis of iron oxide-copper-gold deposits, eastern Mount Isa Block, Australia. Econ Geol 99:1145–1176
Ozima M, Podosek FA (2002) Noble gas geochemistry, 2nd edn. Cambridge University Press, Cambridge, p 286
Peréz E, Cooper MR, Covacevich V (1990) Aptian ammonite-based age for the Pabellón Formation, Atacama Region, northern Chile. Rev Geol Chile 17:181–185
Pollard PJ (2000) Evidence of a magmatic fluid and metal source for Fe-oxide Cu–Au mineralization. In: Porter TM (ed) Hydrothermal iron oxide–copper–gold and related deposits—a global perspective, vol 1, PGC Publishing. Adelaide, Australia, pp 27–41
Rabbia O, Frutos J, Pop N, Isache C, Sanhueza V (1996) Carácterísticas isotópicas de la mineralización de Cu(-Fe) de la mina Carola, distrito minero Punta del Cobre, Norte de Chile. Proc13th Argentinan Geologic Congr, Buenos Aires, Argentina, vol. 3, pp 289–295
Rieger AA, Marschik R, Díaz M, Hölzl S, Chiaradia M, Akker B, Spangenberg JE (2010) The hypogene IOCG mineralization in the Mantoverde district, northern Chile. Econ Geol 105:1271–1299
Rieger AA, Marschik R, Díaz M (2012) The evolution of the hydrothermal IOCG system in the Mantoverde district, northern Chile: new evidence from microthermometry and stable isotope geochemistry. Mineral Deposits 47:359–369
Scheuber E, Andriessen PAM (1990) The kinematic and geodynamic significance of the Atacama fault zone, northern Chile. J Struct Geol 12:243–257
Scheuber E, Hammerschmidt K, Friedrichsen H (1995) 40Ar/39Ar and Rb–Sr analyses from ductile shear zones from the Atacama Fault Zone, Northern Chile: the age of deformation. Tectonophysics 250:61–87
Schilling JG, Unni CK, Bender ML (1978) Origin of chlorine and bromine in the oceans. Nature 273:631–636
Smith SP, Kennedy BM (1983) The solubility of noble gases in water and in NaCl brine. Geochim Cosmochim Acta 47:503–515
Smith MP, Gleeson SA, Yardley BWD (2013) Hydrothermal fluid evolution and metal transport in the Kiruna district, Sweden: contrasting metal behaviour in aqueous and aqueous-carbonic brines. Geochim Cosmochim Acta 102:89–112
Suarez M, Bell CM (1987) Upper Triassic to lower cretaceous continental and coastal saline lake evaporites in the Atacama region of northern Chile. Geol Mag 124:467–475
Taylor GK, Grocott J, Pope A, Randall DE (1998) Mesozoic fault systems, deformation and fault block rotation in the Andean forearc: a crustal scale strike-slip duplex in the coastal cordillera of Northern Chile. Tectonophysics 299:93–109
Torresi I, Xavier RP, Bortholoto DFA, Monteiro LVS (2012) Hydrothermal alteration, fluid inclusions and stable isotope systematics of the Alvo 118 iron oxide–copper–gold deposit, Carajás Mineral Province (Brazil): Implications for ore genesis. Mineral Deposits 47:299–323
Turner G, Bannon MP (1992) Argon isotope geochemistry of inclusion fluids from granite-associated mineral veins in southwest and northeast England. Geochim Cosmochim Acta 56:227–243
Vila T, Lindsay N, Zamora R (1996) Geology of the Manto Verde copper deposit, northern Chile: a specularite-rich, hydrothermal-tectonic breccia related to the Atacama Fault Zone. In: Camus F, Sillitoe RM, Petersen R, Sheahan P (eds) Andean copper deposits: new discoveries, mineralization, styles and metallogeny. Soc Econ Geol Spec Publ 5:157–170
Williams PJ, Kendrick MA, Xavier RP (2010) Sources of fluid components in IOCG deposits. In: Porter TM (ed) Hydrothermal iron-oxide copper-gold & related deposits: a global perspective, vol 3. PGC Publishing, Adelaide, pp 107–116
Worden RH (1996) Controls on halogen concentrations in sedimentary formation waters. Min Mag 60:259–274
Zherebstova LK, Volkova NN (1966) Experimental study of behaviour of trace elements in the process of natural solar evaporation of Black Sea water and Sasyk-Sivash brine. Geochem Int 3:656–670
Acknowledgments
We thank A.A. Rieger for sample preparation and M. Díaz and AngloAmerican Chile, Mantoverde Division, for their support. Many thanks also to C.C. Mineral Candelaria and to all members of the Geology Department for their constant support over many years. Comments by G. Beaudoin, F. Barra, and two anonymous reviewers are greatly appreciated.
Author information
Authors and Affiliations
Corresponding author
Additional information
Editorial handling: F. Barra and G. Beaudoin
Rights and permissions
About this article
Cite this article
Marschik, R., Kendrick, M.A. Noble gas and halogen constraints on fluid sources in iron oxide-copper-gold mineralization: Mantoverde and La Candelaria, Northern Chile. Miner Deposita 50, 357–371 (2015). https://doi.org/10.1007/s00126-014-0548-x
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s00126-014-0548-x