Os and S isotope studies of ultramafic rocks in the Duke Island Complex, Alaska: variable degrees of crustal contamination of magmas in an arc setting and implications for Ni–Cu–PGE sulfide mineralization

Stifter, Eric C.; Ripley, Edward M.; Li, Chusi

doi:10.1007/s00126-016-0640-5

Cited by 9 publications

(2 citation statements)

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“…A modeling study demonstrated that primary magma (derived from the enriched SCLM) for the Jinchuan deposit only experienced ∼18% fractional crystallization, but at least ∼33% fractional crystallization was required for parental magma to become sulfur‐saturated if no external sulfur was added (Duan et al., 2016). External crustal sulfur is highly expected to inject into mafic magma to promote sulfur saturation and then segregate sulfide melts (Li & Ripley, 2011; Ripley & Li, 2013; Stifter et al., 2016; Wei et al., 2019). A lack of correlation between Δ 199 Hg and δ 34 S ( p > 0.05, t ‐test) is also observed in our samples, which may suggest the decoupling of Hg and S during magmatic processes, however, is more possibly explained by different sources of Hg and S in the Jinchuan deposit.…”

Section: Discussionmentioning

confidence: 99%

“…Magmatic Ni‐Cu sulfide deposits, containing about 56% and 5.1% of the world's Ni and Cu resources, respectively (Mudd & Jowitti, 2014; Peck & Huminicki, 2016; Singer, 2017), are economically significant ore deposits formed by the extreme separation of sulfide melts from mafic‐ultramafic magma accomplished by extreme extraction of Ni‐Cu from magma into the sulfide melts (Barnes & Lightfoot, 2005). Mantle magma often has low sulfur contents, and incorporation of crustal‐derived components (e.g., sulfides) is considered an important trigger for the sulfide saturation of mantle‐derived mafic magmas, leading to the formation of economically important Ni‐Cu sulfide deposits (Li & Ripley, 2011; Ripley & Li, 2013; Stifter et al., 2016; Wei et al., 2019). An example of this is the Jinchuan deposit, China's largest and the world's third‐largest magmatic Ni‐Cu sulfide deposit in terms of Ni metal reserves (∼620 Mt; Song et al., 2009).…”

Section: Introductionmentioning

confidence: 99%

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Crustal Mercury Addition Into the Giant Jinchuan Ni‐Cu Sulfide Deposit, China, and Its Geological Implications

Gao

Long

Dong

et al. 2022

Geochem Geophys Geosyst

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Mercury (Hg) is a unique metal with multiple oxidation states (0, +1, and +2) and physical states (solid, liquid, and gas) in nature. It has seven natural stable isotopes (196, 198-202, 204 amu), which undergo unique mass-dependent fractionation (MDF, expressed as δ 202 Hg) and mass-independent fractionation (MIF, typically expressed as Δ 199 Hg). Hg-MDF ubiquitously is generated during physical, chemical, biological processes, Hg-MIF is formed mainly during photochemical reactions with little influence from other processes (Blum et al., 2014). Past studies have utilized Hg isotopes to constrain anthropogenic Hg pollution sources (Kwon et al., 2020) and large volcanic Hg emissions in geological history (Grasby et al., 2019;Shen et al., 2020Shen et al., , 2022. The development of Hg isotopes for metallogenetic and petrogenetic tracing is progressing. Recent estimates on 3 He-rich basalts imply the lack of Hg-MIF signals in the primitive mantle (Δ 199 Hg = 0 ± 0.1‰; Moynier et al., 2021). Photochemical reactions have resulted in positive Δ 199 Hg values in marine sediments (0 to +0.4‰;

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Crustal Mercury Addition Into the Giant Jinchuan Ni‐Cu Sulfide Deposit, China, and Its Geological Implications

Gao

Long

Dong

et al. 2022

Geochem Geophys Geosyst

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Advances in Magmatic Ni–Cu–(PGE) Sulphide Deposits and Their Constraints on Neoproterozoic Tectonic Settings of China

Yu,

Chen,

Cao

et al. 2024

Geological Journal

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Magmatic Ni–Cu–(PGE) sulphide deposits are the primary global sources of nickel, copper and platinum group elements (PGE). The study of these deposits is critical for mineral exploration and holds important economic implications. This paper reviews recent advances in understanding magmatic Ni–Cu–(PGE) sulphide deposits and their related magmatism. Findings reveal that these deposits have an uneven global distribution and a wide range of classifications. The Proterozoic era represents the main period of mineralisation, and the mineralisation setting is closely related to continental rifts, mantle plumes and collision orogenic belts. An ongoing debate exists between the ‘magma conduit’ and ‘deep‐multiple magma chamber segregation’ models, which differ in mineralisation location, magma intrusion mechanisms and the role of external sulphur addition. The primary mechanisms of sulphide segregation include rapid cooling, crystal differentiation and crustal contamination. Furthermore, this paper examines the spatial–temporal distribution and mineralisation dynamic settings of Neoproterozoic magmatic Ni–Cu–(PGE) sulphide deposits in China and their relationship to the convergence and breakup of the Rodinia supercontinent. These Neoproterozoic deposits are located along the margins of the Yangtze, North China and Tarim blocks. They formed in five different stages, 1000–960, 900–850, 830–800, 760–740 and 650–620 Ma, corresponding to the following tectonic settings, respectively: (1) a back‐arc extensional setting before the convergence of the Yangtze and Cathaysia blocks; (2) a post‐orogenic extensional setting following the convergence between the Yangtze and North China blocks; (3) a rift setting related to the first Neoproterozoic mantle plume event (830–795 Ma) within the Yangtze Block or North China Block; (4) a rift setting related to the second Neoproterozoic mantle plume event (780–745 Ma) within the Tarim Block and (5) an intraplate rift setting within the Yangtze Block. The evolving mineralisation dynamic settings of these deposits indicate that their mineralisation is directly related to large‐scale mafic–ultramafic magmatism during the Neoproterozoic and the convergence and breakup of the Rodinia supercontinent.

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Addition of H2O at the Baishiquan and Tianyu magmatic Ni-Cu sulfide deposits, southern Central Asian Orogenic Belt, China: evidence from isotopic geochemistry of olivine and zircon

Tang

Qin

et al. 2021

Miner Deposita

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Os and S isotope studies of ultramafic rocks in the Duke Island Complex, Alaska: variable degrees of crustal contamination of magmas in an arc setting and implications for Ni–Cu–PGE sulfide mineralization

Cited by 9 publications

References 51 publications

Crustal Mercury Addition Into the Giant Jinchuan Ni‐Cu Sulfide Deposit, China, and Its Geological Implications

Crustal Mercury Addition Into the Giant Jinchuan Ni‐Cu Sulfide Deposit, China, and Its Geological Implications

Advances in Magmatic Ni–Cu–(PGE) Sulphide Deposits and Their Constraints on Neoproterozoic Tectonic Settings of China

Addition of H2O at the Baishiquan and Tianyu magmatic Ni-Cu sulfide deposits, southern Central Asian Orogenic Belt, China: evidence from isotopic geochemistry of olivine and zircon

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