Geochronology of the giant Beiya gold-polymetallic deposit in Yunnan Province, Southwest China and its relationship with the petrogenesis of alkaline porphyry

Fu, Yu; Sun, Xiaoming; Lin, Huan; Zhou, Haoyang; Li, Xin; Ouyang, Xianqing; Jiang, Liyi; Shi, Guiyong; Liang, Yeru

doi:10.1016/j.oregeorev.2015.05.016

Cited by 35 publications

(17 citation statements)

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“…Previous studies suggested that the Beiya ore-related porphyry were formed at 36.1 ± 0.4 Ma [24], and that the titanite U-Pb age and the molybdenite Re-Os age have altogether constrained the Beiya Au skarn mineralization to ca. 33.1-34.1 Ma [61].…”

Section: Age Of Skarn Mineralization In the Beiya And Machangqing Depmentioning

confidence: 99%

“…Most of the porphyries were emplaced at around 36.9 to 33.3 Ma [24][25][26]28,[56][57][58][59][60], except for the quartz albite porphyry (65 Ma) and the biotite orthoclase porphyry (3.8 Ma) [45]. The quartz syenite porphyry in the Beiya deposit has been LA-ICP-MS zircon U-Pb dated to be 36.07 ± 0.43 Ma [24], and the retrograde-stage hydrothermal titanite yielded a weighted average 206 Pb/ 238 U age of 33.1 ± 1.0 Ma [61]. Molybdenite from the Beiya Au skarn has yielded a Re-Os isochron age of 34.7 ± 1.6 Ma, which constrains the age of the quartz-sulfide stage mineralization [24].…”

Section: Beiyamentioning

confidence: 99%

“…The quartz syenite porphyry in the Beiya deposit has been LA-ICP-MS zircon U-Pb dated to be 36.07 ± 0.43 Ma [24], and the retrograde-stage hydrothermal titanite yielded a weighted average 206 Pb/ 238 U age of 33.1 ± 1.0 Ma [61]. Molybdenite from the Beiya Au skarn has yielded a Re-Os isochron age of 34.7 ± 1.6 Ma, which constrains the age of the quartz-sulfide stage mineralization [24].…”

Section: Beiyamentioning

confidence: 99%

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LA-ICP-MS U-Th-Pb Dating and Trace Element Geochemistry of Allanite: Implications on the Different Skarn Metallogenesis between the Giant Beiya Au and Machangqing Cu-Mo-(Au) Deposits in Yunnan, SW China

Sun

et al. 2017

Minerals

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Abstract:The giant Beiya Au skarn deposit and Machangqing porphyry Cu-Mo-(Au) deposit are located in the middle part of the Jinshajiang-Ailaoshan alkaline porphyry metallogenic belt. The Beiya deposit is the largest Au skarn deposit in China, whilst the Machangqing deposit comprises a well-developed porphyry-skarn-epithermal Cu-Mo-(Au) mineral system. In this paper, we present new allanite U-Th-Pb ages and trace element geochemical data from the two deposits and discuss their respective skarn metallogenesis. Based on the mineral assemblage, texture and Th/U ratio, the allanite from the Beiya and Machangqing deposits are likely hydrothermal rather than magmatic. Laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) allanite U-Th-Pb dating has yielded Th-Pb isochron ages of 33.4 ± 4.6 Ma (MSWD = 0.22) (Beiya) and 35.4 ± 9.8 Ma (MSWD = 0.26) (Machangqing), representing the retrograde alteration and magnetite skarn mineralization age of the two deposits. The Beiya and Machangqing alkali porphyry-related mineralization are synchronous and genetically linked to the magmatic hydrothermal activities of the Himalayan orogenic event. Major and trace element compositions reveal that the Beiya allanite has higher Fe 3+ /(Fe 3+ + Fe 2+ ) ratios, U content and Th content than the Machangqing allanite, which indicate a higher oxygen fugacity and F content for the ore-forming fluids at Beiya. Such differences in the ore-forming fluids may have contributed to the different metallogenic scales and metal types in the Beiya and Machangqing deposit.

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Section: Age Of Skarn Mineralization In the Beiya And Machangqing Depmentioning

confidence: 99%

Section: Beiyamentioning

confidence: 99%

Section: Beiyamentioning

confidence: 99%

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LA-ICP-MS U-Th-Pb Dating and Trace Element Geochemistry of Allanite: Implications on the Different Skarn Metallogenesis between the Giant Beiya Au and Machangqing Cu-Mo-(Au) Deposits in Yunnan, SW China

Sun

et al. 2017

Minerals

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“…36.9 to 33.3 Ma [23][24][25]27,[43][44][45][46][47], except for the quartz-albite porphyry (65 Ma) and biotite-orthoclase porphyry (3.8 Ma) [40]. The Beiya quartz syenite porphyry is thought to be ore-related, and was dated as 36.1 ± 0.43 Ma [23] by zircon U-Pb, providing the minimum age of the skarn alteration. The Beiya skarn orebodies occur mostly in and/or along the intrusive contacts with the carbonate rocks of the Beiya Formation.…”

Section: Ore Deposit Geologymentioning

confidence: 99%

“…(2) the retrograde alteration stage was hydrothermal titanite U-Pb dated to be 33.1 ± 1.0 Ma [48], and contains predominantly hydrous minerals (including epidote, biotite and chlorite), magnetite, titanite, feldspar with minor scheelite and fluorite. Magnetite is the main ore mineral of this stage and formed massive orebodies; (3) the quartz-sulfide stage was molybdenite Re-Os dated to be 36.8 ± 0.5 Ma and 34.7 ± 1.6 Ma [23,27], and contains mainly pyrite, chalcopyrite, pyrrhotite and molybdenite. Although the mineral assemblage indicated that the quartz-sulfide stage is later than the retrograde stage, the former age (36.8 ± 0.5 Ma) is older than the age of the retrograde stage (33.1 ± 1.0 Ma) within the associated uncertainties.…”

Section: Ore Deposit Geologymentioning

confidence: 99%

U-Pb Geochronology and Geochemistry of U-Rich Garnet from the Giant Beiya Gold-Polymetallic Deposit in SW China: Constraints on Skarn Mineralization Process

Sun

et al. 2018

Minerals

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The giant Beiya Au skarn deposit (over 300 tonnes Au metal reserve) is located in the middle part of the Jinshajiang-Ailaoshan alkaline porphyry metallogenic belt. The deposit is the largest Au skarn deposit and third largest Au deposit in China. In this paper, we present garnet U-Pb ages and trace element geochemical data from two types of skarn-related U-rich garnet from Beiya, and discuss their implications on skarn metallogenesis. Based on optical characteristics and major element compositions, the older Grt I and the younger Grt II (both belong to the grossular-andradite solid solution) are distinguishable: Grt II (Adr 69.0 Grs 26.8-Adr 93.5 Grs 1.5) is slightly richer in Fe than Grt I (Adr 68.5 Grs 20.3-Adr 86.3 Grs 3.4), with the average FeO contents being 25.0% and 24.5%, respectively. LA-ICP-MS garnet U-Pb dating yielded lower intercept ages of 35.8 ± 0.8 Ma (MSWD = 0.9, n = 20) and 34.0 ± 2.1 Ma (MSWD = 1.2, n = 16), respectively. These ages represent the timing of the garnet crystallization, and are consistent with published alteration ages within error, which suggests that the technique presented provides a reliable alternative in dating skarn alteration. Grt I has higher U content and lower Th/U ratio than Grt II, indicating a lower oxygen fugacity for the earlier skarn alteration. Grt II shows weak (or no) Eu anomaly and lower LREE/HREE ratios than those of Grt I, which indicates that Grt I and Grt II may have formed under a mildly acidic and nearly neutral condition, respectively. From the early prograde skarn (Grt I) to late prograde skarn (Grt II) stage, the ore-forming fluids may have changed from a relatively reduced acidic to a relatively oxidized neutral pH condition.

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Textures and trace element geochemistry of magnetite in the Beiya gold deposit, SW China

et al. 2021

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The Beiya gold deposit (323t of gold @ 2.47 g/t) is located in the centre of the Jinshajiang‐Ailaoshan potassium alkaline porphyry Cu‐Au metallogenic belt in SW China, which is the largest skarn gold deposit in China. As the dominant ore mineral at Beiya, magnetite has been selected as a petrogenetic indicator to understand the ore‐forming process. In this study, magnetites have been divided into the euhedral–subhedral (ME), anhedral (MA), lamellar (ML), and replaced (MR) types based on their textures, which have been further determined by in situ laser ablation inductively coupled plasma mass spectrometry analyses. In detail, plots in discriminant diagrams constrain the Beiya magnetite a hydrothermal origin. Trace elements in magnetite vary with respect to different textures. Titanium concentrations are similar in all magnetite types, suggesting that all magnetites were precipitated in a relatively narrow temperature range. The decreasing V content combined with haematite after magnetite (martitization) suggests that the oxygen fugacity increased from ME and MA and then decreased to ML and MR. All magnetite types show similar content variations and similar (Mg + Mn)/Al ratios, indicating a decreasing degree of fluid–rock interactions. The rim–core texture indicates that the MR type magnetite has experienced the dissolution–reprecipitation process. Mushketovite marks the later ore‐forming environment and the iron‐rich hydrothermal fluids transformed from high temperature and oxidized to low temperature and reduced features. Magnetite textures, combined with its trace element variations, could be used as a potential tool for inferring the ore‐forming fluid evolution.

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Geochronology of the giant Beiya gold-polymetallic deposit in Yunnan Province, Southwest China and its relationship with the petrogenesis of alkaline porphyry

Cited by 35 publications

References 40 publications

LA-ICP-MS U-Th-Pb Dating and Trace Element Geochemistry of Allanite: Implications on the Different Skarn Metallogenesis between the Giant Beiya Au and Machangqing Cu-Mo-(Au) Deposits in Yunnan, SW China

LA-ICP-MS U-Th-Pb Dating and Trace Element Geochemistry of Allanite: Implications on the Different Skarn Metallogenesis between the Giant Beiya Au and Machangqing Cu-Mo-(Au) Deposits in Yunnan, SW China

U-Pb Geochronology and Geochemistry of U-Rich Garnet from the Giant Beiya Gold-Polymetallic Deposit in SW China: Constraints on Skarn Mineralization Process

Textures and trace element geochemistry of magnetite in the Beiya gold deposit, SW China

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