Origin of ore-forming fluids of the Haigou gold deposit in the eastern Central Asian Orogenic belt, NE China: Constraints from H-O-He-Ar isotopes

Zeng, Qingdong; He, Huaiyu; Zhu, Rixiang; Zhang, Song; Wang, Yongbin; Su, Fei

doi:10.1016/j.jseaes.2017.01.018

Cited by 32 publications

(17 citation statements)

References 44 publications

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“…3A, B). Several studies have concluded that these dikes formed in the Cretaceous on the basis of zircon U-Pb ages between 132.4 ± 1.5 and 124.6 ± 2.2 Ma (e.g., Li, X., et al, 2012;Chang et al, 2013;Zeng et al, 2017). The distribution of the dikes and the Au-bearing quartz veins was controlled mainly by numerous NE-NNE-oriented faults and less so by NS-and EWoriented faults (Fig.…”

Section: Ore Deposit Geologymentioning

confidence: 99%

“…2, 3), respectively. Reserves of more than 40 t Au with an average grade of 3.4 g/t have been identified (Zeng et al, 2017). The auriferous quartz veins occur in three clusters, namely, the V38, V28, and V43 clusters in the eastern, central, and western parts of the ore district, respectively.…”

Section: Ore Deposit Geologymentioning

confidence: 99%

“…The auriferous quartz veins occur in three clusters, namely, the V38, V28, and V43 clusters in the eastern, central, and western parts of the ore district, respectively. The V28 cluster is the most important, and hosts ~30 t gold with grades from 3 to 10 g/t (avg 8 g/t) (Zeng et al, 2017). This ore cluster consists of several continuous and parallel veins, which generally strike northeast (45°) and dip northwest (312°-318°) at angles of 45° to 85°.…”

Section: Ore Deposit Geologymentioning

confidence: 99%

“…However, very few ages have been reported for the lode gold deposits in this region, and the only ages that are available are consistent with a Mesozoic age for this mineralization; these ages were determined mainly from sericite associated with the gold mineralization using the Ar-Ar method (e.g., Hart et al, 2002;Yang et al, 2003;Yu et al, 2010;Chai et al, 2016 researchers consider the lode gold deposits in this region to be genetically related to Mesozoic granites emplaced during Paleo-Pacific oceanic plate subduction (e.g., Yang et al, 2003;Yu et al, 2010). This includes the Haigou gold deposit, which is the focus of the current study (e.g., Yu et al, 2010;Li, L., et al, 2017;Zeng et al, 2017). Li, L., et al (2017) proposed an age of 161.9 ± 1.3 Ma for the Haigou deposit based on Ar-Ar dating of associated sericite, and Yu et al (2010) and Feng (1998) obtained ages of 171 ± 16 and 144 Ma, respectively, for fluid inclusions in auriferous quartz veins using Ar-Ar and K-Ar methods.…”

Section: A Previously Unrecognized Paleozoic Gold Mineralizationmentioning

confidence: 99%

“…Li, L., et al (2017) proposed an age of 161.9 ± 1.3 Ma for the Haigou deposit based on Ar-Ar dating of associated sericite, and Yu et al (2010) and Feng (1998) obtained ages of 171 ± 16 and 144 Ma, respectively, for fluid inclusions in auriferous quartz veins using Ar-Ar and K-Ar methods. Finally, several studies have concluded that the gold mineralization at Haigou took place between 132 and 125 Ma, based on zircon U-Pb age determinations for dikes that crosscut the orebodies (e.g., Li, X., et al, 2012;Chang et al, 2013;Zeng et al, 2017). However, the zircon U-Pb ages for the dikes cutting orebodies can only establish the lower age limit for gold deposition at Haigou and not the actual timing of gold mineralization.…”

Section: A Previously Unrecognized Paleozoic Gold Mineralizationmentioning

confidence: 99%

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Evaluating the Use of the Molybdenite Re-Os Chronometer in Dating Gold Mineralization: Evidence from the Haigou Deposit, Northeastern China

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Donghang (2019) 'Evaluating the use of the molybdenite Re-Os chronometer in dating gold mineralization : evidence from the Haigou Deposit, Northeastern China.', Economic geology., 114 (5). pp. 897-915.Further information on publisher's website: https://doi.org/10. 5382/econgeo.2019.4667 Publisher's copyright statement:Subject to SEG terms of use and conditions. Additional information: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. AbstractThe Haigou lode gold deposit (>40 tons [t] at 3.4 g/t), which is located near the eastern boundary of the Central Asian orogenic belt and the North China craton, is one of the largest gold deposits in northeastern China.Native gold is intergrown with molybdenite and pyrite in auriferous quartz veins hosted by a monzogranitemonzonite stock and locally by Proterozoic gneiss, thereby offering an excellent opportunity to directly date the mineralizing event. Uranium-Pb age determinations for zircon yielded ages for the monzogranite and monzonite of 327.1 ± 1.1 and 329.5 ± 1.0 Ma, respectively. Numerous mafic to felsic dikes, which are crosscut by ore veins (pre-ore), parallel to these veins (possibly synore), or crosscut by them (post-ore), were carefully examined and dated. Their zircon 206 Pb/ 238 U ages are 318.3 ± 1.0, 310.9 ± 1.1, and 134.9 ± 0.4 Ma, respectively, thereby placing the timing of gold mineralization within the relatively large interval of 318.3 ± 1.0 to 134.9 ± 0.4 Ma. The age of mineralization was determined directly using the Re-Os method applied to molybdenite. A total of 19 molybdenite samples separated from auriferous quartz veins yielded widely differing Re-Os model ages of 467 to 155 Ma, and replicate analyses of individual samples also yielded widely differing ages. Significantly, the wide range is attributable entirely to the results obtained for some coarse-grained molybdenite samples and is interpreted to be due to Re and Os isotope decoupling, the considerable spatial Re heterogeneity, the analytical procedure (e.g., use of small sample aliquots), and the post-ore deformation. Nine of the samples, which are all fine grained, yielded a robust weighted mean model age of 310 ± 3 Ma and an isochron age of 309 ± 8 Ma. Thus, the molybdenite Re-Os ages are identical, within uncertainty, to those of the dikes that are parallel to the ore veins, indicating that these dikes were emplaced contemporaneously with the ore and that they and the Haigou gold mineralization are of late Paleozoic age (ca. 310 Ma). Finally, a sericite sample obtained from an auriferous vein retur...

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Section: Ore Deposit Geologymentioning

confidence: 99%

Section: Ore Deposit Geologymentioning

confidence: 99%

Section: Ore Deposit Geologymentioning

confidence: 99%

Section: A Previously Unrecognized Paleozoic Gold Mineralizationmentioning

confidence: 99%

Section: A Previously Unrecognized Paleozoic Gold Mineralizationmentioning

confidence: 99%

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Evaluating the Use of the Molybdenite Re-Os Chronometer in Dating Gold Mineralization: Evidence from the Haigou Deposit, Northeastern China

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Zircon U–Pb age, Hf isotope, and geochemistry of Late Permian to Triassic igneous rocks from the Jiapigou gold ore belt, NE China: Petrogenesis and tectonic implications

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The Jiapigou gold ore belt is located in the northeastern corner of the wedge-shaped North China Craton and is hosted by Neoarchean basement gneiss and amphibolite, along with late Palaeozoic and Mesozoic granitoids. In this paper, whole-rock major and trace element geochemistry together with zircon U-Pb ages and Lu-Hf isotope compositions are reported for Late Permian to Triassic igneous rocks from the gold belt. The dominant population of zircons in all these rocks shows oscillatory growth zoning in CL images, and relatively high Th/U ratios (0.10-5.23) that are indicative of a magmatic origin. Zircon U-Pb data indicate that the igneous rocks formed during two major phases: ca. 252 Ma and ca. 230-213 Ma. Geochemically, the Late Permian (ca. 252 Ma) diorites are high-K calc-alkaline in composition and low total Fe 2 O 3 , MgO, and CaO contents, and represented by enrichment in LILEs relative to HFSEs and HREEs, all of which are indicative of a postcollision high-K calc-alkaline granite affinity. In contrast, the Late Triassic (ca. 230-213 Ma) igneous rocks are mainly quartz syenite porphyries, felsites, and granodiorites, and are variable medium-to high-K calc-alkaline series and exhibit a negative Eu anomaly with A-type affinities,indicating an extensional environment. In addition, in situ Hf isotopic analyses of zircons from four dated samples reveal that they have ε Hf (t) values of −3.0 to +2.2, with two-stage model (T DM2 ) ages range from 964 to 1,210 Ma, indicating that they probably originated from the partial melting of a dominantly Mesoproterozoic to Neoproterozoic crustal source. On the basis of the geochemical data and regional geological investigations, we further propose that the Jiapigou gold ore belt in the Late Permian was formed in a postcollisional tectonic setting, whereas an extensional tectonic setting in the Late Triassic that caused lithospheric thinning during a postorogenic event.

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Mineralogy and He–Ar isotopic compositions of pyrites in the Paishanlou Au deposit on the northern margin of North China Craton

et al. 2019

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The Paishanlou Au deposit is an altered‐rock type with the magmatic‐hydrothermal type deposit on the northern margin of the North China Craton and hosts a resource of ~40 tonnes Au. The deposit is hosted in the Neoarchean metamorphic rocks of the Jianping Group and is controlled mainly by ENE–NW‐trending ductile shear zones. The orebodies are stratoid, and mineralization styles are divided into auriferous altered felsic mylonite and altered biotite plagioclase mylonite. The sulphide minerals are dominated by pyrite that is recognized as pyrite 1, pyrite 2, and pyrite 3 based on crystalline form and structure, and pyrite 2 is the main auriferous mineral. Three types of pyrite were selected for electron microprobe analysis (EPMA), and the results show S deficiency, indicating that the pyrites are formed in reducing conditions. The pyrites have a trend from being Fe deficient to being Fe enriched, suggesting that the crystallization rate increases with the decrease of impurity composition from the early to the late stage. The Co/Ni ratios and Co–Ni–As diagram reflect that the Paishanlou Au deposit is associated with magmatic‐hydrothermal and is affected by various hydrothermal. He–Ar isotopic analyses of auriferous pyrite 2 indicate that the ore‐forming fluids are mixtures of mantle‐derived and modified air‐saturated water (MASW). 3He/4He ratios range from 0.21 to 1.51 Ra (Ra = 1.39 × 10−6 for air), corresponding to a 2.18%–19.06% mantle He contribution. The formation of mixed ore‐forming fluids was related to magmatism associated with craton destruction during the Early Cretaceous. Also, we attempt to use the thermoelectric characteristics of pyrite and a contour chart of Au grades to indicate potential mineralization prospecting areas.

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Origin of ore-forming fluids of the Haigou gold deposit in the eastern Central Asian Orogenic belt, NE China: Constraints from H-O-He-Ar isotopes

Cited by 32 publications

References 44 publications

Evaluating the Use of the Molybdenite Re-Os Chronometer in Dating Gold Mineralization: Evidence from the Haigou Deposit, Northeastern China

Evaluating the Use of the Molybdenite Re-Os Chronometer in Dating Gold Mineralization: Evidence from the Haigou Deposit, Northeastern China

Zircon U–Pb age, Hf isotope, and geochemistry of Late Permian to Triassic igneous rocks from the Jiapigou gold ore belt, NE China: Petrogenesis and tectonic implications

Mineralogy and He–Ar isotopic compositions of pyrites in the Paishanlou Au deposit on the northern margin of North China Craton

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