Multiple sulfur isotopes monitor fluid evolution of an Archean orogenic gold deposit

LaFlamme, Crystal; Sugiono, Dennis; Thébaud, Nicolas; Caruso, Stefano; Fiorentini, Marco L.; Selvaraja, Vikraman; Jeon, Heejin; Voute, François; Martin, Laure

doi:10.1016/j.gca.2017.11.003

Cited by 91 publications

(9 citation statements)

References 51 publications

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“…Examining stable isotopes in geological objects (rocks, mineralizing fluids, vein minerals, and ore deposits) has proven to be a powerful method that allows one to study their genesis in detail [91]. The genesis and sources of ore matter in orogenic Au deposits are controversial; first of all, the issue concerns the identification and assessment of the role of host rocks and deep-seated (magmatogenic and/or metamorphic) ore-bearing fluids in the process of ore formation (see [92][93][94] and references therein). The reported δ 34 S values for sulfide minerals from orogenic gold deposits range from −20‰ to + 25‰ [92].…”

Section: Origin Of Hydrothermal Sulfides According To Stable Sulfur I...mentioning

confidence: 99%

Disseminated Gold–Sulfide Mineralization in Metasomatites of the Khangalas Deposit, Yana–Kolyma Metallogenic Belt (Northeast Russia): Analysis of the Texture, Geochemistry, and S Isotopic Composition of Pyrite and Arsenopyrite

et al. 2021

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At the orogenic gold deposits of the Yana–Kolyma metallogenic belt (northeast Russia) both Au–quartz-sulfide mineralization with native gold and disseminated sulfide mineralization with invisible Au developed. The textural and mineralogical-geochemical features, isotope-geochemical characteristics of gold-bearing sulfides from proximal metasomatites, and possible forms of Au occurrence in pyrite and arsenopyrite have been studied using electron microprobe, atomic absorption, LA-ICP-MS trace element, isotope analysis, and computed microtomography. Four generations of pyrite (Py1, diagenetic; Py2, metamorphic; Py3, metasomatic; Py4, veined) and two generations of arsenopyrite (Apy1, metasomatic; Apy2, veined) have been identified at the Khangalas deposit. In the proximal metasomatites, the most common are Py3 and Apy1. Studying their chemical composition makes it possible to identify the features of the distribution patterns of typochemical trace elements in pyrite and arsenopyrite, and to establish the nature of the relationship between Au and these elements. In Py3 and Apy1, structurally bound (solid solution) Au+ prevails, isomorphically entering the crystal lattice or its defects. Isotope characteristics of hydrothermal sulfides (d34S = –2.0 to –0.6‰) indicate that mantle/magmatic sulfur was involved in the formation of the deposit, though the participation of sulfur from the host rocks of the Verkhoyansk clastic complex cannot be ruled out. The Khangalas deposit has much in common with other gold deposits of the Yana–Kolyma metallogenic belt, and from this point of view, the results obtained will help to better reveal their gold potential and understand their origin.

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Section: Origin Of Hydrothermal Sulfides According To Stable Sulfur I...mentioning

confidence: 99%

Disseminated Gold–Sulfide Mineralization in Metasomatites of the Khangalas Deposit, Yana–Kolyma Metallogenic Belt (Northeast Russia): Analysis of the Texture, Geochemistry, and S Isotopic Composition of Pyrite and Arsenopyrite

et al. 2021

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“…The ability of SIMS to analyze a spot 15 × 15 µm in size was an important element in this research, as many of the gold-associated sulfides were either very small or zoned. The detailed analytical procedures for the in situ sulfur isotope analysis by SIMS are described in [60,61]. The mass-independent fractionations of sulfur are denoted by ∆ 33 S (= δ 33 S − 1000((1 + δ 34 S/1000) 0.515 − 1)) and ∆ 36 S (= δ 36 S − 1000((1 + δ 34 S/1000) 1.91 − 1)) notation to represent the deviation between the isotopic ratios measured and those predicted according to mass-dependent fractionation [60,62].…”

Section: In Situ Multiple Sulfur Isotope Analysismentioning

confidence: 99%

Isotope Geochemistry of the Shenshuitan Gold Deposit within the Wulonggou Gold Field in the Eastern Kunlun Orogen, Northwest China: Implications for Metallogeny

Zhou

Tong²,

Ding

et al. 2022

Minerals

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The Shenshuitan gold deposit is located within the Eastern Kunlun Orogen in northwest China. The gold mineralization here occurs primarily within the ductile fault XI. The sulfide mineral assemblage is dominated by pyrite and arsenopyrite, with minor pyrrhotite, chalcopyrite, galena, and sphalerite. Host rocks predominantly consist of Ordovician silicic slate and late Silurian granites, and their alterations include silicification and sericitization. The measured δD and δ18O values of quartz and sericite range from −113.9‰ to −93.1‰ and from 4.6‰ to 12.0‰, respectively. Bulk and in situ δ34S values of sulfides range from −7.3‰ to +9.6‰ and from −3.92‰ to 11.04‰, respectively. Lead isotope compositions of sulfides show 206Pb/204Pb ratios from 18.071 to 19.341, 207Pb/204Pb ratios from 15.530 to 15.67, and 208Pb/204Pb ratios from 37.908 to 38.702. Collectively, the isotope (H, O, S, and Pb) geochemistry suggests that the ore-forming fluids were of a metamorphic origin mixed with meteoric water and that the sulfur and lead were sourced from a mixture of host rocks and original ore-forming metamorphic fluids. Lastly, this deposit can be classified as an orogenic gold deposit associated with the final collision between the Bayan Har–Songpanganzi Terrane and the Eastern Kunlun Orogen during the Later Triassic.

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“…http://www.minsocam.org/ More significant changes in δ 34 S ratios can result from changes in the proportions of oxidized and reduced sulfur species in the ore fluid (e.g., Ohmoto 1972). Fluid oxidation has been commonly suggested to cause negative δ 34 S ratios in sulfides and rapid gold deposition in hydrothermal ore deposits (LaFlamme et al 2018). Fractionation of heavy S into the oxidized sulfur species would cause 34 S-depleted H 2 S in the residual hydrothermal fluid.…”

Section: Sulfur Isotopic Fingerprint Of Ore-forming Processesmentioning

confidence: 99%

In situ chemical and isotopic analyses and element mapping of multiple-generation pyrite: Evidence of episodic gold mobilization and deposition for the Qiucun epithermal gold deposit in Southeast China

Jiang

Frimmel

et al. 2022

American Mineralogist

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Gold deposits are often the result of complex mineralization and remobilization processes.Interpretation of bulk geochemical and sulfur isotope data of the gold deposits is frequently hampered by complex zoning in pyrite, which calls for in situ determination of geochemical and sulfur isotope composition of sulfide minerals. The Qiucun deposit is a good representative of epithermal gold deposit in the Mesozoic Coastal Volcanic Belt of southeastern China. It represents a complex mineralization history, comprising three hydrothermal stages: (I) early stage of This is the peer-reviewed, final accepted version for American Mineralogist, published by the Mineralogical Society of America.The published version is subject to change. Cite as Authors (Year) Title. American Mineralogist, in press.

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Multiple sulfur isotopes monitor fluid evolution of an Archean orogenic gold deposit

Cited by 91 publications

References 51 publications

Disseminated Gold–Sulfide Mineralization in Metasomatites of the Khangalas Deposit, Yana–Kolyma Metallogenic Belt (Northeast Russia): Analysis of the Texture, Geochemistry, and S Isotopic Composition of Pyrite and Arsenopyrite

Disseminated Gold–Sulfide Mineralization in Metasomatites of the Khangalas Deposit, Yana–Kolyma Metallogenic Belt (Northeast Russia): Analysis of the Texture, Geochemistry, and S Isotopic Composition of Pyrite and Arsenopyrite

Isotope Geochemistry of the Shenshuitan Gold Deposit within the Wulonggou Gold Field in the Eastern Kunlun Orogen, Northwest China: Implications for Metallogeny

In situ chemical and isotopic analyses and element mapping of multiple-generation pyrite: Evidence of episodic gold mobilization and deposition for the Qiucun epithermal gold deposit in Southeast China

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