Geochemical and isotopic composition of auriferous pyrite from the Yongxin gold deposit, Central Asian Orogenic Belt: Implication for ore genesis

Yuan, Mao‐Wen; Li, Shengrong; Li, Chenglu; Santosh, M.; Alam, Masroor; Zeng, Yong‐Jie

doi:10.1016/j.oregeorev.2018.01.002

Cited by 44 publications

(18 citation statements)

References 49 publications

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“…The Mo/Ni ratio values in the pyrite from the Kargah Cu-Pb polymetallic deposit are characterized by low values, ranging from 0.43 to 0.94. This range of values is closed to the Yongxin Au deposit (0.41-2.33), which is derived from the mafic-source hydrothermal fluids [44]. In contrast, a mixed provenance of mafic to intermediate and felsic ore-forming fluids such as Bagrote gold deposit show high ratio values (1.35-59) as compared with our data [9].…”

Section: Composition and Implication For Ore-forming Fluidssupporting

confidence: 63%

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Mineralogy, Fluid Inclusions, and Isotopic Study of the Kargah Cu-Pb Polymetallic Vein-Type Deposit, Kohistan Island Arc, Northern Pakistan: Implication for Ore Genesis

Hussain

Tao

et al. 2021

Minerals

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The Kargah Cu-Pb polymetallic deposit is a newly discovered ore deposit from the Gilgit-Baltistan region, located in the Kohistan Island Arc, northern Pakistan. However, this area is poorly researched on the ore genesis, and its origin and the evolution of its magmatic-hydrothermal system remain unclear. Three stages of mineralization were identified, including quartz-pyrite, quartz-sulfide, and carbonate representing early, middle, and late stages, respectively. The major ore minerals are pyrite, chalcopyrite, galena, and zincian tetrahedrite with minor native silver, and native gold mainly distributed in pyrite. Here, we present a systematic study on ore geology, hydrothermal alterations, trace element composition of pyrite, fluid inclusions, and isotopes (S and Pb) characteristics to gain insights into the nature of the ore-forming fluids, types of unknown deposits, and hydrothermal fluid evolution. The high Co/Ni ratio (1.3–16.4) and Co content (average 1201 ppm), the low Mo/Ni ratio (0.43–0.94) and Mo contents (average 108 ppm) of both Py-I and Py-II suggest a mafic source for the mineralization. The Au-Ni plots, Co-As-Ni correlation, and the δ34S values range from −2.8 to 6.4‰ (average of 3.4‰) indicating the affiliation of the mineralization with a mantle-derived magmatic-hydrothermal provenance. The Pb isotope data showing the narrow variations in 206Pb/204Pb, 207Pb/204Pb and 208Pb/204Pb values suggest a single lead source from crustal-derived materials. The microthermometry data suggest that the dominant mechanisms are fluid boiling and mixing for mineral precipitation at temperatures ranging between 155 and 555 °C, and represent an intrusion-related magmatic-hydrothermal environment for the Kargah Cu-Pb polymetallic deposit.

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Section: Composition and Implication For Ore-forming Fluidssupporting

confidence: 63%

“…The analytical precision yielded a relative error (2σ) of <0.15‰. A Neptune II Multi Collector-Inductively Coupled Plasma Mass Spectrometer (MC-ICP-MS) was used to measure the Pb isotopic composition at the Beijing Research Institute of Uranium Geology (BRIUG), following the criteria described in Yuan et al [43,44].…”

Section: Sampling and Analytical Methodsmentioning

confidence: 99%

Mineralogy, Fluid Inclusions, and Isotopic Study of the Kargah Cu-Pb Polymetallic Vein-Type Deposit, Kohistan Island Arc, Northern Pakistan: Implication for Ore Genesis

Hussain

Tao

et al. 2021

Minerals

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“…Visible gold often occurs in quartz and pyrite as microfracture and inclusion gold (Figure f), whereas invisible gold mainly occurs as nanometre‐sized particles and solid solution in the pyrite. Fine‐grained pyrite has the best gold‐bearing properties among all kinds of pyrite (Yuan et al, ; Z. H. Zhao et al, , b).…”

Section: Geology Of Yongxin Gold Depositmentioning

confidence: 99%

“…Hydrothermal alterations include silicification, sericitization, and potassic alteration, of which silicification alteration is closely related to gold mineralization at Yongxin (Figure a; Yuan, Zeng, Li, Li, & Li, ). Four hydrothermal stages have been identified at Yongxin, including pyrite‐quartz stage (I), pyrite stage (II), gold‐pyrite‐galena‐sphalerite stage (III), and carbonate stage (IV) (Yuan et al, ). Visible gold often occurs in quartz and pyrite as microfracture and inclusion gold (Figure f), whereas invisible gold mainly occurs as nanometre‐sized particles and solid solution in the pyrite.…”

Section: Geology Of Yongxin Gold Depositmentioning

confidence: 99%

Zircon U–Pb geochronology and Sr–Nd–Pb–Hf isotopic constraints on the timing and origin of the Early Cretaceous igneous rocks in the Yongxin gold deposit in the Lesser Xing'an Range, NE China

Zhong-hai

Sun

Li³

et al. 2019

Geological Journal

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The Lesser Xing'an Range in NE China is an important gold district. However, the age and genesis of Early Cretaceous magmatic rocks that are coeval with gold mineralization remain obscure. A suite of Early Cretaceous igneous rocks in a newly discovered gold deposit at Yongxin was conducted zircon U–Pb dating and Hf isotope and bulk‐rock geochemistry and Sr–Nd–Pb isotope analyses. A dacite of the Guanghua Formation and an andesite of the Longjiang Formation have zircon U–Pb ages of 111.7 ± 1.5 Ma and 119.7 ± 1.9 Ma, respectively. The dacite has zircon εHf(t) values of 5.4 to 12.0 and depleted bulk‐rock Sr–Nd–Pb isotopes ((87Sr/86Sr)i = 0.7049 to 0.7056, εNd(t) = 1.2 to 2.5, (206Pb/204Pb)i = 18.202 to 18.320). The andesite has zircon εHf(t) values of 5.6 to 13.6, (87Sr/86Sr)i of 0.7049 to 0.7051, εNd(t) of 1.0 to 1.6, and (206Pb/204Pb)i of 18.199 to 18.297. The ~120 Ma diorite porphyry and granite porphyry have zircon εHf(t) values of 3.7 to 10.0 and 3.6 to 10.2, respectively. These two units show large variations of 87Rb/86Sr ratios (<1) and similar Sr–Nd–Pb isotopes compositions. All rock units are enriched in light rare earth elements and large‐ion lithophile elements and depleted in high‐field‐strength elements. The formation of Yongxin Early Cretaceous igneous rocks was related to variable degrees of partial melting from Jurassic basalt in the lower crust with significant contribution from ancient continental materials. The low Sr/Y ratios (2–24) and negative correlations between Sr, Eu/Eu, and SiO2 indicate that magmas of the Early Cretaceous igneous rocks at Yongxin have low water content and thus have low potentiality for porphyry copper mineralization.

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“…Gangue minerals mainly include quartz, K‐feldspar, sericite, chlorite, and calcite. Four stages of mineralization have been identified at Yongxin, including pyrite‐quartz stage (I), pyrite stage (II), gold‐pyrite‐galena‐sphalerite stage (III), and carbonate stage (IV; Yuan et al, ). As the most abundant sulphide in the Yongxin gold deposit, pyrite is widespread throughout the stages of mineralization.…”

Section: Deposit Geologymentioning

confidence: 99%

Age of theYongxin Audeposit in theLesser Xing'an Range: Implications for anEarly Cretaceousgeodynamic setting for gold mineralization inNE China

Zhong-hai

Sun

et al. 2018

Geological Journal

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The newly discovered Yongxin Au deposit in the Lesser Xing'an Range of north‐eastern Heilongjiang Province, NE China, has a resource of ~20 t with a grade of 4.1 g/t Au. The deposit is hosted by Carboniferous syenogranite and mylonite, and Cretaceous diorite porphyry and granite porphyry. The syenogranite has a LA‐ICP‐MS 206Pb/238U zircon age of 316 ± 2 Ma, and both the granite porphyry and diorite porphyry yield an age of 119 ± 1 Ma. The Rb–Sr isochron age of Au‐bearing pyrite from hydrothermal breccia‐type ore is 107 ± 4 Ma, and this is interpreted as the mineralization age of the Yongxin deposit. In combination with published geochronological data, we argue that epithermal Au mineralization in NE China formed during the period ca. 124 to 107 Ma and was produced during rollback of Palaeo‐Pacific oceanic slab. The Cretaceous epithermal Au deposits are distributed in the Erguna Massif, Lesser Xing'an Range, Zhangguangcai Range, and Jiamusi and Nadanhada terranes. In combination with the coeval porphyry Mo deposits present in these areas, we propose that the Erguna Massif, Lesser Xing'an Range, north‐eastern Great Xing'an Range, and eastern Jiamusi and Nadanhada terranes, where only epithermal gold deposits were discovered up to date, might be prospective for concealed porphyry Cu or Mo deposits.

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Geochemical and isotopic composition of auriferous pyrite from the Yongxin gold deposit, Central Asian Orogenic Belt: Implication for ore genesis

Cited by 44 publications

References 49 publications

Mineralogy, Fluid Inclusions, and Isotopic Study of the Kargah Cu-Pb Polymetallic Vein-Type Deposit, Kohistan Island Arc, Northern Pakistan: Implication for Ore Genesis

Mineralogy, Fluid Inclusions, and Isotopic Study of the Kargah Cu-Pb Polymetallic Vein-Type Deposit, Kohistan Island Arc, Northern Pakistan: Implication for Ore Genesis

Zircon U–Pb geochronology and Sr–Nd–Pb–Hf isotopic constraints on the timing and origin of the Early Cretaceous igneous rocks in the Yongxin gold deposit in the Lesser Xing'an Range, NE China

Age of theYongxin Audeposit in theLesser Xing'an Range: Implications for anEarly Cretaceousgeodynamic setting for gold mineralization inNE China

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