Formation timing and genesis of <scp>M</scp>adiu fluorite deposit in <scp>East Qinling, China</scp>: <scp>C</scp>onstraints from fluid inclusion, geochemistry, and <scp>H–O–Sr–Nd</scp> isotopes

Yu, Zhisheng; Pei, Qiuming; Zhang, Shou‐ting; Guo, Ge; Li, Junjun; Wang, Xinyang; Hu, Xin‐Kai; Song, Kai-Rui; Wang, Liang

doi:10.1002/gj.3522

Cited by 17 publications

(5 citation statements)

References 86 publications

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“…Finally, quartz veins and quartz-fluorite veins filled along faults within the syenogranite wall rocks in the Yama area. In essence, the Yama fluorite deposit is a fault-controlled hydrothermal vein-type deposit (e.g., [70,71]), and might be also classified as a Qiquanba type of meso-epithermal fluorite deposit in China, as proposed by [72]. The Late Ordovician-Early Silurian syenogranites as well as other granites in the Tataleng granitic batholith are just wall rocks for fluorite mineralization; thus, potential fluorite mineralization should be searched for within the subsidiary brittle faults within granites rather than in the granitic bodies themselves.…”

Section: Implication For the Genesis Of Fluorite Mineralizationmentioning

confidence: 99%

Geochemical and Isotopic Compositions of Fluorites from the Yama Fluorite Deposit in the Qilian Orogen in Northwest China, and Their Metallogenic Implications

Jiao,

Huang,

et al. 2023

Minerals

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The Yama area is characterized by numerous large-scale fluorite–quartz veins that are located along faults within the widespread Late Devonian–Late Silurian syenogranites in the Tataleng granitic batholith, Qilian Orogen, Northwest China. These fluorite–quartz veins contribute to an important fluorite reserve, but their ore genesis remains unresolved so far. In this study, trace elements, rare earth elements (REEs), and hydrogen, oxygen, and strontium isotopic compositions of fluorites are analyzed. The studied fluorite samples have similar chondrite-normalized REEs, including Y patterns, with relatively strong enrichment in heavy REEs, negative Eu anomalies, strongly positive Y anomalies, and comparably invariable Y/Ho ratios of 41.43–73.79, suggesting a unique hydrothermal genesis. The relatively variable values of δD and δ18O are −77.4‰ to −102.4‰ and −12.7‰ to −4.3‰, respectively, close to the meteoric water line. These fluorites yield relatively invariable analytical 87Sr/86Sr ratios of 0.749089−0.756628 (except for an anomalously high ratio), and their calculated initial 87Sr/86Sr ratios, based on the ore-forming ages provided, are apparently higher than the calculated initial 87Sr/86Sr ratios of syenogranite wall rocks. Collectively, the geochemistry of trace elements, REEs, and stable isotopes (H, O, and Sr) suggests that the ore-forming fluids were of meteoric origin and that the Sr sources were directly derived from the ore-forming fluids themselves rather than syenogranite wall rocks. Finally, it was considered that the Yama fluorite deposit is a fault-controlled hydrothermal vein-type deposit which was possibly related to the evolution of the Paleo-Tethys Ocean in the Permian–Triassic.

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Section: Implication For the Genesis Of Fluorite Mineralizationmentioning

confidence: 99%

Geochemical and Isotopic Compositions of Fluorites from the Yama Fluorite Deposit in the Qilian Orogen in Northwest China, and Their Metallogenic Implications

Jiao,

Huang,

et al. 2023

Minerals

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“…Due to extensive magmatic-hydrothermal events in the Xiong'ershan area, different types of metal deposits (e.g., Au, Mo, Pb, Zn, Ag) are produced. These deposits are mainly related to three periods of metallogenic events with ages of Palaeoproterozoic (1.8 Ga;Li et al, 2015), Triassic (246-202 Ma;Li & Pirajno, 2017), and Late Mesozoic (160-115 Ma;Chen, Ye, & Wang, 2014;Hu et al, 2020;Zhao et al, 2020;Tang et al, 2021).…”

Section: Regional Geologymentioning

confidence: 99%

“…Furthermore, the δ 34 S values of Py3 are positive (2.0‰ to 4.5‰), suggesting that biogenic sulphur from the Guandaokou and Luanchuan groups was not incorporated into the hydrothermal system. As barite presents as a gangue mineral and the ore-forming fluid shows an oxidized feature (ƒO 2 = 10 −30 to 10 −33 ) in stages I and II, resulting in the change of 34 S into SO 2 4 (Li et al, 1999;Zhao et al, 2020). The low δ 34 S values of Py1 and Py2 were therefore attributed to the isotope fractionation between sulphate and sulphide minerals.…”

Section: Sulphur Sources and Ore Genesismentioning

confidence: 99%

Genesis of hydrothermal gold mineralization in the Qianhe deposit, central China: Constraints from in situ sulphur isotope and trace elements of pyrite

et al. 2021

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The Qianhe gold deposit, located at Xiong'ershan in Eastern Qinling, with estimated gold reserves of 22 tons, hosts six orebodies within auriferous quartz veins and hydrothermally-altered rocks along E-W trending faults. Here we present results from an integrated study involving field investigation, ore petrology, in situ sulphur isotopes, and trace elements analysis of gold-bearing pyrite with a view to understanding the genesis of the hydrothermal gold mineralization. Three generations of pyrite are identified in the Qianhe Au deposit: Py1 is composed of coarse-grained, euhedral cubic grains occurring at the margin of stage I quartz + pyrite vein; Py2 is occurs as porous grains coexisting with other sulphide minerals in stage II quartz + polymetallic sulphide veins; and Py3 is mainly composed of anhedral grains in stage III quartz + calcite + fluorite vein. Among the three generations, Py2 has the highest contents of Au (mean = 3.5 ppm), Ag (mean = 46.0 ppm), Zn (mean = 303 ppm), and Cu (mean = 346 ppm). The distribution and concentration of these trace elements are likely to be controlled by micro/nano-inclusions in pyrite. The Co/Ni ratios range from 0.010 to 296, with most values lying between 0.1 and 10. The δ 34 S values of the various pyrite generations show a wide range between −17.9‰ and 4.5‰ with obviously higher values in Py3 (2.0‰ to 4.5‰) than those in Py1 (−16.7‰ to −13.5‰) and Py2 (−17.9‰ to −9.0‰). The negative δ 34 S values in Py1 and Py2 possibly resulted from sulphur isotope fractionation between sulphide and sulphate minerals. As sulphate minerals are absent in stage III, the slightly positive δ 34 S values in Py3 suggest a mixed source from mantle-derived material and wall rocks of the Xiong'er Group. We correlate the genesis of gold mineralization in the Qianhe deposit with the extension and lithospheric thinning during Early Cretaceous, when ore-bearing fluids channelled along fault zones induced hydrothermal alteration and Au mineralization.

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“…The Xiong'er Group has been classified as a low-grade, low-strain metamorphosed volcanic sequence that unconformably overlies the Taihua Group, and its lithology consists of basaltic andesite and andesite, with minor dacite and rhyolite [35][36][37][38][39][40][41][42]. In the Xiong'ershan area, magmatic events can be divided into three periods: i) Palaeoproterozoic magmatism represented by the Xiong'er Group volcanic rocks [39]; ii) Triassic alkaline magmatism that formed the Mogou granite porphyry, which is exposed as several elliptic syenite stocks [28]; iii) late Mesozoic magmatism is the most important magmatic event mainly exposed as granite plutons [17,18,[20][21][22][23][24]).…”

Section: Geological Settingmentioning

confidence: 99%

“…Whether the Banzhusi granite porphyry has the same magma sources with the input of mantle materials is unknown. [17,18,[20][21][22][23][24]).…”

Section: Introductionmentioning

confidence: 99%

Geochemistry, Zircon U-Pb Geochronology and Hf-O Isotopes of the Banzhusi Granite Porphyry from the Xiong’ershan Area, East Qinling Orogen, China: Implications for Petrogenesis and Geodynamics

et al. 2019

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The Banzhusi granite porphyry is located in the Xiong’ershan area, East Qinling orogenic belt (EQOB). This study presents an integrated whole-rock geochemistry and zircon U-Pb-Hf-O isotope analysis of the Banzhusi granite porphyry. These rocks have metaluminous, high-K alkali-calcic and shoshonitic features and show significant enrichment in light rare earth elements (LREEs) over heavy rare earth elements (HREEs) with negative Eu anomalies. These samples are also greatly enriched in Rb, Ba, K, Pb, Th and U and depleted in Nb, Ta, P and Ti, and they mostly overlap the ranges of the Taihua Group tonalite–trondhjemite–granodiorite (TTG) gneiss. Magmatic zircons from three samples of the Banzhusi granite porphyry yield U-Pb ages of 125.1 ± 0.97 Ma, 128.1 ± 1.2 Ma and 128.2 ± 1.3 Ma. The Hf-O isotope features of zircons from the three samples are very similar (δ18Ozircon = 4.84‰ to 6.51‰, εHf(t) = −26.9 to −14.4). The co-variations of geochemical and isotopic data in these granite porphyries imply that the Banzhusi granite porphyry resulted from the mixing of the partially melted Taihua Group and mantle-derived material in a post-collisional setting from 128–125 Ma.

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Formation timing and genesis of Madiu fluorite deposit in East Qinling, China: Constraints from fluid inclusion, geochemistry, and H–O–Sr–Nd isotopes

Cited by 17 publications

References 86 publications

Geochemical and Isotopic Compositions of Fluorites from the Yama Fluorite Deposit in the Qilian Orogen in Northwest China, and Their Metallogenic Implications

Geochemical and Isotopic Compositions of Fluorites from the Yama Fluorite Deposit in the Qilian Orogen in Northwest China, and Their Metallogenic Implications

Genesis of hydrothermal gold mineralization in the Qianhe deposit, central China: Constraints from in situ sulphur isotope and trace elements of pyrite

Geochemistry, Zircon U-Pb Geochronology and Hf-O Isotopes of the Banzhusi Granite Porphyry from the Xiong’ershan Area, East Qinling Orogen, China: Implications for Petrogenesis and Geodynamics

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