In-situ LA-SF-ICP-MS U-Pb dating of garnet from Guanfang tungsten deposit in southeastern Yunnan Province and its geological significance

刘益,; Liu, Yi; 孔志岗,; Kong, Zhaochen; 陈港,; Chen, Gang; 邵凤丽,; Shao, Fang; 唐燕文,; Tang, Yanwen; 孙滨,; Sun, Bin; 杨光树,; Yang, Guangshu; 蔡金定,; JinDing, Cai

doi:10.18654/1000-0569/2021.03.13

Cited by 5 publications

(2 citation statements)

References 40 publications

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“…Its geochemical compositions reflect the nature of early ore fluids and water–rock interactions, and the compositional oscillatory zoning (if any) could record fluctuations in physicochemical conditions during the hydrothermal evolution (Bian et al, 2019; Fernando et al, 2003; Gaspar et al, 2008; Kim, 2006; Martin et al, 2011; Zhai et al, 2014). With high‐resolution in situ LA‐ICP‐MS (laser ablation inductively coupled plasma mass spectrometry) technology, many works have been carried out on skarn ore‐related garnets (Bian et al, 2019; Gao, Deng, et al, 2014; Gao, Li, et al, 2014; Gaspar et al, 2008; Liu et al, 2021; Nie et al, 2022; Yu et al, 2022; Zhai et al, 2014; Zhang, Shao, et al, 2017; Zhang, Zhang, et al, 2017; Zhao et al, 2018), including U–Pb dating (for garnet samples even with <1 ppm) (Duan et al, 2020; Gevedon et al, 2018; Li et al, 2019; Liu et al, 2021; Tang et al, 2021; Wafforn et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Genesis of the Lamasu large skarn Cu deposit, northern Xinjiang: Constraints from garnet U–Pb dating, micro‐textural and geochemical analyses

Wang,

Liu,

Lai

et al. 2023

Geological Journal

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The Lamasu deposit is the first large copper (Cu) deposit with ~0.6 Mt Cu reserve in the Chinese Western Tianshan Orogen (NW China). The Cu orebodies are mainly hosted in the exoskarn of the Proterozoic Kusongmuqieke Group. Now, the metallogenic mechanism of newly discovered skarn Cu orebodies (0.5 Mt Cu) remains poorly constrained. In this study, we conducted LA‐ICP‐MS U–Pb isotope dating, EPMA and LA‐ICP‐MS geochemical analyses on different generations of garnet from Lamasu to elucidate the magmatic hydrothermal evolution and its timing. Garnets from the Lamasu exoskarn can be divided into three types: reddish‐brown coarse‐grained Grt‐I, light brown fine‐grained Grt‐II and yellowish‐green heterogranular Grt‐III, with U–Pb age of 389.1 ± 2.0 Ma, 387.1 ± 1.8 Ma and 387.0 ± 2.3 Ma, respectively. These dates represent the oldest Cu mineralization age in the Chinese Western Tianshan, coeval with the Middle Devonian subduction of the North Tianshan oceanic plate. Grt‐I to Grt‐III particles are mainly andradite with minor grossularite, and they have different REE compositions. The Grt‐I has total REE contents (∑REE) of 101.47 to 262.87 ppm, with steeply right‐inclining REE distribution patterns (LREE/HREE of 3.81 to 68.50) and positive Eu anomaly. The Grt‐II core has ∑REE of 163.49–249.52 ppm, LREE/HREE of 2.00–4.71, and negative Eu anomaly. The Grt‐II rim has ∑REE of 46.34–99.99 ppm, with LREE/HREE of 18.06–177.23, and positive Eu anomaly. The ∑REE of Grt‐III range from 31.71 to 219.02 ppm, with flat REE distribution pattern and positive Eu anomaly, and the LREE/HREE ranges from 2.16 to 9.07. These garnets have similar trace element compositions, featured by LILE‐depletions (e.g., Rb, Ba and Sr) and HFSE enrichments (e.g., Th, U, Nb and Ce). Micro‐texture and geochemical composition of garnets indicate that the Lamasu magmatic hydrothermal system could have changed from an open to a closed environment, and from infiltration metasomatism to diffusive metasomatism, which formed Grt‐I, Grt‐II and Grt‐III successively. These garnets generally formed in a relatively oxidized fluid environment, which inhibited early sulphide precipitation and favoured for Cu enrichment during the ore fluid evolution.

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Section: Introductionmentioning

confidence: 99%

Genesis of the Lamasu large skarn Cu deposit, northern Xinjiang: Constraints from garnet U–Pb dating, micro‐textural and geochemical analyses

Wang,

Liu,

Lai

et al. 2023

Geological Journal

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“…Notably, the detailed U mapping of garnet illustrates a uniform distribution, indicating that U occurs within the garnet crystal lattice. U-Pb ages of garnet therefore represent the crystallization ages of the rock, which are of critical importance to establish a temporal link with ore-related intrusive bodies [13][14][15][16][17][18][19][20][21][22][23][24][25]. Sulfide minerals with complex structures can record the chemical properties and the evolution process of ore-forming fluids, so the S isotope analysis can be used to analyze the geochemical environment and source of ore-forming materials [26,27], and track the changes in sulfur sources accurately.…”

Section: Introductionmentioning

confidence: 99%

Metallogenic Mechanism and Geodynamic Background of the Chang’an Chong Cu-Mo Deposit in Southern Ailaoshan Tectonic Belt: New Evidence from Garnet U-Pb Dating and In-Situ S Isotope

et al. 2022

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The Chang’an Chong Cu-Mo deposit is located in the Chang’an Cu-Mo-Au ore cluster in the southern Ailaoshan tectonic belt in southwestern China. There are six intrusive bodies in the mining area, among which the No.Ⅱ intrusive body is the largest and most closely related to Cu-Mo mineralization of skarn. The No. 1 main orebody is composed of the No. 1 copper orebody and No. 1 molybdenum orebody, which are distributed in parallel with similar shapes. In this paper, the age of skarn is determined by the LA-SF-ICP-MS U-Pb dating of garnet, and it is nearly consistent with the age of alkaline porphyry in this region (41–32 Ma). Compared with the U-Pb age of zircon from the ore-bearing porphyry and the Re-Os age of molybdenite, the U-Pb age of garnet was consistent with them within error, indicating that they were the same mineralization event, which further proves that the porphyry-skarn Cu-Mo-Au mineralization event along the Ailaoshan-Red River fault zone mainly occurred at 38~32 Ma. In-situ S isotope results show that the δ34S mean values of disseminated pyrite (PyI), pyrite of sulfide veins (PyⅡ) and chalcopyrite (Ccp) in the main mineralization period are 2.35‰, 3.60‰ and 0.55‰, respectively. These δ34S values are similar to those of magma and slightly enriched in δ34S, and the δ34S value of chalcopyrite is mainly concentrated near 0‰, so it can be considered that the S of the ore-forming fluid came from magmatic-hydrothermal fluids. Based on the comprehensive analysis of the regional metallogenic background, deposit chronology and isotope geochemistry, it is concluded that the Chang’an Chong Cu-Mo deposit was formed in an intra-plate post-collision strike-slip environment.

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Multiple-stage W mineralization in the Guanfang W deposit, southeastern Yunnan Province, China: Insights from scheelite in-situ trace elemental and Sr isotopic analyses

Sun,

Liu,

Kong

et al. 2024

Acta Geochim

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In-situ LA-SF-ICP-MS U-Pb dating of garnet from Guanfang tungsten deposit in southeastern Yunnan Province and its geological significance

Cited by 5 publications

References 40 publications

Genesis of the Lamasu large skarn Cu deposit, northern Xinjiang: Constraints from garnet U–Pb dating, micro‐textural and geochemical analyses

Genesis of the Lamasu large skarn Cu deposit, northern Xinjiang: Constraints from garnet U–Pb dating, micro‐textural and geochemical analyses

Metallogenic Mechanism and Geodynamic Background of the Chang’an Chong Cu-Mo Deposit in Southern Ailaoshan Tectonic Belt: New Evidence from Garnet U-Pb Dating and In-Situ S Isotope

Multiple-stage W mineralization in the Guanfang W deposit, southeastern Yunnan Province, China: Insights from scheelite in-situ trace elemental and Sr isotopic analyses

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