Multiple sulfur isotopes constraints on origin and evolution of the Neoarchean and Paleoproterozoic Cu-Au systems from the Carajás Domain, Amazonian Craton, Brazil

E. S.B. Santiago; R. P. Xavier; S. G. Hagemann; L. V.S. Monteiro; J. Cliff

doi:10.1016/j.oregeorev.2020.103872

Multiple sulfur isotopes constraints on origin and evolution of the Neoarchean and Paleoproterozoic Cu-Au systems from the Carajás Domain, Amazonian Craton, Brazil

E. S.B. Santiago
, R. P. Xavier
, S. G. Hagemann
, L. V.S. Monteiro
, J. Cliff

Research output: Contribution to journal › Article › peer-review

8 Scopus citations

Abstract

Multiple sulfur isotopes in sulfides were measured by in situ Secondary Ion Mass Spectrometry in order to constrain sulfur sources and pathways, as well as explore atmosphere–ore genesis implications on the metallogeny of the Neoarchean and Paleoproterozoic Cu-Au systems of the Carajás Domain, southeast Amazonian Craton, Brazil. All of the investigated Neoarchean (2.70–2.57 Ga; i.e., Salobo, Igarapé Bahia, Castanha and Sequeirinho) and Paleoproterozoic IOCG (ca 1.88 Ga; i.e., Alvo 118 and Sossego) deposits show Δ³³S < 0‰ (-0.17‰ to + 0.02‰). The Paleoproterozoic Cu-Au(W-Sn-Bi) Breves deposit reveals Δ³³S > 0‰ (+0.08‰ to + 0.27‰), implying that sulfur underwent mass-independent fractionation (MIF). In addition, three distinct δ³⁴S ranges are defined: −3.07‰ to + 3.01‰ and + 2.17‰ to + 4.68‰ for the Neoarchean and Paleoproterozoic IOCG deposits, respectively, and −0.46‰ to + 3.81‰ for the Paleoproterozoic Breves deposit. In the Neoarchean IOCG deposits, sulfur is most likely of mantle/magmatic origin. However, a subtle but detectable MIF-S signature reflects the inheritance of a minor sulfur component transported to the atmosphere, experienced photolytic reactions and returned to the hydrosphere. The interaction between highly saline, hot, and deep-seated metalliferous fluids with the host rocks, including sulfate-bearing volcanic rocks that underwent seafloor alteration, may account for the small negative Δ³³S values in the IOCG deposits. The similarity between the negative Δ³³S signatures of the Neoarchean and the Paleoproterozoic IOCG deposits (i.e., Sossego and Alvo 118) suggest that the MIF signatures recorded by the latter most likely reflect inheritance of Neoarchean sulfur with MIF signatures acquired by large scale fluid-rock interaction triggered by the ca 1.88 Ga A-type granitic magmatism. The positive Δ³³S values of sulfides from the Paleoproterozoic Breves deposit, in contrast, were probably generated by reduced sulfur species sourced from crustal sources (e.g., Archean pyrite-bearing sedimentary units) in addition to magmatic sulfur related to ca. 1.88 Ga A-type granite emplacement.

Original language	English
Article number	103872
Journal	Ore Geology Reviews
Volume	129
DOIs	https://doi.org/10.1016/j.oregeorev.2020.103872
State	Published - Feb 2021
Externally published	Yes

Funding

This study is a partial result of the first author’s Ph.D. thesis, who was a fellow of the Brazilian CAPES Foundation at the Institute of Geosciences – UNICAMP and visiting Ph.D. student at the Centre for Exploration Targeting – UWA, Perth-Australia (Process n° 14479-13-3). The authors are grateful to Vale for the continuous logistical support provided to UNICAMP researchers and students during their visit to mine sites in Carajás. Sincere gratitude is due to the scientific and technical staff of the Australian Microscopy & Microanalysis Research Facility at the Centre for Microscopy, Characterisation & Analysis of the UWA, a facility funded by the University, State and Commonwealth Governments. This research has been financially supported by INCT – Geociências da Amazônia (GEOCIAM) (MCT/CNPq/FAPESPA 573733/2008-2). This study is a partial result of the first author's Ph.D. thesis, who was a fellow of the Brazilian CAPES Foundation at the Institute of Geosciences ? UNICAMP and visiting Ph.D. student at the Centre for Exploration Targeting ? UWA, Perth-Australia (Process n? 14479-13-3). The authors are grateful to Vale for the continuous logistical support provided to UNICAMP researchers and students during their visit to mine sites in Caraj?s. Sincere gratitude is due to the scientific and technical staff of the Australian Microscopy & Microanalysis Research Facility at the Centre for Microscopy, Characterisation & Analysis of the UWA, a facility funded by the University, State and Commonwealth Governments. This research has been financially supported by INCT ? Geoci?ncias da Amaz?nia (GEOCIAM) (MCT/CNPq/FAPESPA 573733/2008-2).

Keywords

Amazonian Craton
Carajás Mineral Province
IOCG systems
Mass independent fractionation
Multiple sulfur isotopes

Access to Document

10.1016/j.oregeorev.2020.103872

Cite this

@article{6517f46c4d6545ce86c3eb705d24dec8,

title = "Multiple sulfur isotopes constraints on origin and evolution of the Neoarchean and Paleoproterozoic Cu-Au systems from the Caraj{\'a}s Domain, Amazonian Craton, Brazil",

abstract = "Multiple sulfur isotopes in sulfides were measured by in situ Secondary Ion Mass Spectrometry in order to constrain sulfur sources and pathways, as well as explore atmosphere–ore genesis implications on the metallogeny of the Neoarchean and Paleoproterozoic Cu-Au systems of the Caraj{\'a}s Domain, southeast Amazonian Craton, Brazil. All of the investigated Neoarchean (2.70–2.57 Ga; i.e., Salobo, Igarap{\'e} Bahia, Castanha and Sequeirinho) and Paleoproterozoic IOCG (ca 1.88 Ga; i.e., Alvo 118 and Sossego) deposits show Δ33S < 0‰ (-0.17‰ to + 0.02‰). The Paleoproterozoic Cu-Au(W-Sn-Bi) Breves deposit reveals Δ33S > 0‰ (+0.08‰ to + 0.27‰), implying that sulfur underwent mass-independent fractionation (MIF). In addition, three distinct δ34S ranges are defined: −3.07‰ to + 3.01‰ and + 2.17‰ to + 4.68‰ for the Neoarchean and Paleoproterozoic IOCG deposits, respectively, and −0.46‰ to + 3.81‰ for the Paleoproterozoic Breves deposit. In the Neoarchean IOCG deposits, sulfur is most likely of mantle/magmatic origin. However, a subtle but detectable MIF-S signature reflects the inheritance of a minor sulfur component transported to the atmosphere, experienced photolytic reactions and returned to the hydrosphere. The interaction between highly saline, hot, and deep-seated metalliferous fluids with the host rocks, including sulfate-bearing volcanic rocks that underwent seafloor alteration, may account for the small negative Δ33S values in the IOCG deposits. The similarity between the negative Δ33S signatures of the Neoarchean and the Paleoproterozoic IOCG deposits (i.e., Sossego and Alvo 118) suggest that the MIF signatures recorded by the latter most likely reflect inheritance of Neoarchean sulfur with MIF signatures acquired by large scale fluid-rock interaction triggered by the ca 1.88 Ga A-type granitic magmatism. The positive Δ33S values of sulfides from the Paleoproterozoic Breves deposit, in contrast, were probably generated by reduced sulfur species sourced from crustal sources (e.g., Archean pyrite-bearing sedimentary units) in addition to magmatic sulfur related to ca. 1.88 Ga A-type granite emplacement.",

keywords = "Amazonian Craton, Caraj{\'a}s Mineral Province, IOCG systems, Mass independent fractionation, Multiple sulfur isotopes",

author = "Santiago, \{E. S.B.\} and Xavier, \{R. P.\} and Hagemann, \{S. G.\} and Monteiro, \{L. V.S.\} and J. Cliff",

note = "Publisher Copyright: {\textcopyright} 2020 Elsevier B.V.",

year = "2021",

month = feb,

doi = "10.1016/j.oregeorev.2020.103872",

language = "English",

volume = "129",

journal = "Ore Geology Reviews",

issn = "0169-1368",

publisher = "Elsevier",

}

TY - JOUR

T1 - Multiple sulfur isotopes constraints on origin and evolution of the Neoarchean and Paleoproterozoic Cu-Au systems from the Carajás Domain, Amazonian Craton, Brazil

AU - Santiago, E. S.B.

AU - Xavier, R. P.

AU - Hagemann, S. G.

AU - Monteiro, L. V.S.

AU - Cliff, J.

PY - 2021/2

Y1 - 2021/2

N2 - Multiple sulfur isotopes in sulfides were measured by in situ Secondary Ion Mass Spectrometry in order to constrain sulfur sources and pathways, as well as explore atmosphere–ore genesis implications on the metallogeny of the Neoarchean and Paleoproterozoic Cu-Au systems of the Carajás Domain, southeast Amazonian Craton, Brazil. All of the investigated Neoarchean (2.70–2.57 Ga; i.e., Salobo, Igarapé Bahia, Castanha and Sequeirinho) and Paleoproterozoic IOCG (ca 1.88 Ga; i.e., Alvo 118 and Sossego) deposits show Δ33S < 0‰ (-0.17‰ to + 0.02‰). The Paleoproterozoic Cu-Au(W-Sn-Bi) Breves deposit reveals Δ33S > 0‰ (+0.08‰ to + 0.27‰), implying that sulfur underwent mass-independent fractionation (MIF). In addition, three distinct δ34S ranges are defined: −3.07‰ to + 3.01‰ and + 2.17‰ to + 4.68‰ for the Neoarchean and Paleoproterozoic IOCG deposits, respectively, and −0.46‰ to + 3.81‰ for the Paleoproterozoic Breves deposit. In the Neoarchean IOCG deposits, sulfur is most likely of mantle/magmatic origin. However, a subtle but detectable MIF-S signature reflects the inheritance of a minor sulfur component transported to the atmosphere, experienced photolytic reactions and returned to the hydrosphere. The interaction between highly saline, hot, and deep-seated metalliferous fluids with the host rocks, including sulfate-bearing volcanic rocks that underwent seafloor alteration, may account for the small negative Δ33S values in the IOCG deposits. The similarity between the negative Δ33S signatures of the Neoarchean and the Paleoproterozoic IOCG deposits (i.e., Sossego and Alvo 118) suggest that the MIF signatures recorded by the latter most likely reflect inheritance of Neoarchean sulfur with MIF signatures acquired by large scale fluid-rock interaction triggered by the ca 1.88 Ga A-type granitic magmatism. The positive Δ33S values of sulfides from the Paleoproterozoic Breves deposit, in contrast, were probably generated by reduced sulfur species sourced from crustal sources (e.g., Archean pyrite-bearing sedimentary units) in addition to magmatic sulfur related to ca. 1.88 Ga A-type granite emplacement.

AB - Multiple sulfur isotopes in sulfides were measured by in situ Secondary Ion Mass Spectrometry in order to constrain sulfur sources and pathways, as well as explore atmosphere–ore genesis implications on the metallogeny of the Neoarchean and Paleoproterozoic Cu-Au systems of the Carajás Domain, southeast Amazonian Craton, Brazil. All of the investigated Neoarchean (2.70–2.57 Ga; i.e., Salobo, Igarapé Bahia, Castanha and Sequeirinho) and Paleoproterozoic IOCG (ca 1.88 Ga; i.e., Alvo 118 and Sossego) deposits show Δ33S < 0‰ (-0.17‰ to + 0.02‰). The Paleoproterozoic Cu-Au(W-Sn-Bi) Breves deposit reveals Δ33S > 0‰ (+0.08‰ to + 0.27‰), implying that sulfur underwent mass-independent fractionation (MIF). In addition, three distinct δ34S ranges are defined: −3.07‰ to + 3.01‰ and + 2.17‰ to + 4.68‰ for the Neoarchean and Paleoproterozoic IOCG deposits, respectively, and −0.46‰ to + 3.81‰ for the Paleoproterozoic Breves deposit. In the Neoarchean IOCG deposits, sulfur is most likely of mantle/magmatic origin. However, a subtle but detectable MIF-S signature reflects the inheritance of a minor sulfur component transported to the atmosphere, experienced photolytic reactions and returned to the hydrosphere. The interaction between highly saline, hot, and deep-seated metalliferous fluids with the host rocks, including sulfate-bearing volcanic rocks that underwent seafloor alteration, may account for the small negative Δ33S values in the IOCG deposits. The similarity between the negative Δ33S signatures of the Neoarchean and the Paleoproterozoic IOCG deposits (i.e., Sossego and Alvo 118) suggest that the MIF signatures recorded by the latter most likely reflect inheritance of Neoarchean sulfur with MIF signatures acquired by large scale fluid-rock interaction triggered by the ca 1.88 Ga A-type granitic magmatism. The positive Δ33S values of sulfides from the Paleoproterozoic Breves deposit, in contrast, were probably generated by reduced sulfur species sourced from crustal sources (e.g., Archean pyrite-bearing sedimentary units) in addition to magmatic sulfur related to ca. 1.88 Ga A-type granite emplacement.

KW - Amazonian Craton

KW - Carajás Mineral Province

KW - IOCG systems

KW - Mass independent fractionation

KW - Multiple sulfur isotopes

UR - https://www.scopus.com/pages/publications/85097101187

U2 - 10.1016/j.oregeorev.2020.103872

DO - 10.1016/j.oregeorev.2020.103872

M3 - Article

AN - SCOPUS:85097101187

SN - 0169-1368

VL - 129

JO - Ore Geology Reviews

JF - Ore Geology Reviews

M1 - 103872

ER -

Multiple sulfur isotopes constraints on origin and evolution of the Neoarchean and Paleoproterozoic Cu-Au systems from the Carajás Domain, Amazonian Craton, Brazil

Abstract

Funding

Keywords

Access to Document

Other files and links

Fingerprint

Cite this