In situ analyses of micas in the Yashan granite, South China: Constraints on magmatic and hydrothermal evolutions of W and Ta–Nb bearing granites

Li, Jie; Huang, Xiaolong; He, Peng-Li; Li, Wu‐Xian; Yang, Yu; Chen, Linli

doi:10.1016/j.oregeorev.2014.09.028

Cited by 105 publications

(31 citation statements)

References 61 publications

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“…Field observations seem to reveal a nearly similar age for the deposits and the associated granites (e.g. Mao et al, 2004aMao et al, , 2004bMao et al, , 2013aMao et al, , 2013bGuo et al, 2011Guo et al, , 2014Wang et al, 2011aWang et al, , 2011bHu et al, 2012aHu et al, , 2012bLi et al, 2014b).…”

Section: Regional Geologymentioning

confidence: 93%

“…The Re-Os isotope system has been recognized as a possible geochemical tool for not only directly dating mineralization but also tracing the source of metals (Stein et al, 1997(Stein et al, , 1998Ruiz and Mathur, 1999;Wang et al, 2011aWang et al, , 2011bLi et al, 2007aLi et al, , 2014b. Comparing Re contents in molybdenite from various types of endogenous Mo deposits in China, Mao et al (1999) recognized that Re in molybdenite varies in content from hundreds (a mantle source) to tens (a mixed mantle/ crust source) to several ppm (a crust source).…”

Section: Re Contents and Origin Of Ore Metalsmentioning

confidence: 99%

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Zircon U–Pb, molybdenite Re–Os and muscovite Ar–Ar isotopic dating of the Xitian W–Sn polymetallic deposit, eastern Hunan Province, South China and its geological significance

Liang

Dong

Jiang

et al. 2016

Ore Geology Reviews

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The Xitian tungsten-tin (W-Sn) polymetallic deposit, located in eastern Hunan Province, South China, is a recently explored region containing one of the largest W-Sn deposits in the Nanling W-Sn metallogenic province. The mineral zones in this deposit comprise skarn, greisen, structurally altered rock and quartz-vein types. The deposit is mainly hosted by Devonian dolomitic limestone at the contact with the Xitian granite complex. The Xitian granite complex consists of Indosinian (Late Triassic, and Yanshanian (Late Jurassic-Early Cretaceous, 165-141 Ma) granites. Zircons from two samples of the Xitian granite dated using laser ablationinductively coupled mass spectrometer (LA-ICPMS) U-Pb analysis yielded two ages of 225.6 ± 1.3 Ma and 151.8±1.4 Ma, representing the emplacement ages of two episodic intrusions of the Xitian granite complex. Molybdenites separated from ore-bearing quartz-veins yielded a Re-Os isochron age of 149.7±0.9 Ma, in excellent agreement with a weighted mean age of 150.3±0.5 Ma. Two samples of muscovites from ore-bearing greisens yielded 40 Ar/ 39 Ar plateau ages of 149.5±1.5 Ma and 149.4±1.5 Ma, respectively. These isotopic ages obtained from hydrothermal minerals are slightly younger than the zircon U-Pb age of 151.8±1.4 Ma of the Yanshanian granite in the Xitian area, indicating that the W-Sn mineralization is genetically related to the Late Jurassic magmatism. The Xitian deposit is a good example of the Early Yanshanian regional W-Sn ore-forming event (160-150 Ma) in the Nanling region. The relatively high Re contents (8.7 to 44.0 ppm, average of 30.5 ppm) in molybdenites suggest a mixture of mantle and crustal sources in the genesis of the ore-forming fluids and melts. Based upon previous geochemical studies of Early Yanshanian granite and regional geology, we argue that the Xitian W-Sn polymetallic deposit can be attributed to back-arc lithosphere extension in the region, which was probably triggered by the break-off of the flat-slab of the Palae-Pacific plate beneath the lithosphere.

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Section: Regional Geologymentioning

confidence: 93%

Section: Re Contents and Origin Of Ore Metalsmentioning

confidence: 99%

Zircon U–Pb, molybdenite Re–Os and muscovite Ar–Ar isotopic dating of the Xitian W–Sn polymetallic deposit, eastern Hunan Province, South China and its geological significance

Liang

Dong

Jiang

et al. 2016

Ore Geology Reviews

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“…The Tamuqisayi Formation is composed of sedimentary and volcanic suites, which include sandstone, mudstone, basalt, and rhyolite. There are several Late Carboniferous (296–306 Ma) felsic intrusions associated with porphyry Cu deposits that occur in this area, including the Mosizaote (296 Ma) (Genwen Chen, unpublished data), Qunji (304 Ma) (Liu, unpublished data), Qunjisayi (306 Ma) (Li et al, , b), and 109 (300 Ma) (Liu, unpublished data) intrusion (Fig. c).…”

Section: Geological Settingmentioning

confidence: 93%

Characteristics of Rare Earth Elements, Zr, and Hf in Ore‐Bearing Porphyries from the Western Awulale Metallogenic Belt, Northwestern China and their Application in Determining Metal Fertility of Granitic Magma

Chen

2018

Resource Geology

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The western Awulale metallogenic belt in northwestern China hosts a number of small-to medium-sized porphyry Cu deposits that are associated with albite porphyry. The common presence of plagioclase (albite) as phenocrysts and the absence of hydrous minerals (amphibole and biotite) indicate that the water content of albite porphyry is low. Trace-element compositions of whole rocks and zircon grains from these orebearing porphyries were measured. Zircon grains from albite porphyries exhibit Ce 4+ /Ce 3+ ratios ranging from 7.75 to 95.1, which indicate that these porphyries have a low oxygen fugacity. Trace element compositions of ore-bearing porphyries exhibit (La/Yb) N ratios ranging from 1.09 to 11.1 and Eu/Eu * ratios ranging from 0.10 to 0.66. These ore-bearing porphyries have Zr values ranging from 171 to 707 ppm and Hf values ranging from 8.30 to 18.9 ppm. Combining these porphyries with other ore-bearing porphyries that formed in the Central Asian Orogenic Belt (CAOB) and the Pacific Rim metallogenic belt, we found that the (La/Yb) N and Eu/Eu * ratios of ore-bearing porphyries in western Awulale are low, while the Zr and Hf values are high. Specifically, REEs can be used to evaluate the degree of differentiation and degree of partial melting, and Zr and Hf can be used to evaluate the redox conditions and water content of magmatic rocks. Our findings indicate that ore-bearing porphyries in western Awulale have a lower oxygen fugacity, degree of differentiation, and water content than do others in the CAOB and the Pacific Rim metallogenic belt. Compared to those of ore-bearing porphyries with lower zircon Ce 4+ /Ce 3+ ratios, the (La/Yb) N ratios of orebearing porphyries in our study are low, and the Zr and Hf values are high. This finding indicates that, under reducing conditions, the degree of evolution and water content may have an important influence on the metal abundance in magmas. There is also a clear relationship between (La/Yb) N , Eu/Eu * , Zr, Hf, and the size of the deposits. Large-(>4 Mt Cu) and intermediate (1.5-4 Mt Cu)-sized porphyry Cu deposits are associated with granitic intrusions that have higher (La/Yb) N and Eu/Eu * ratios and lower Zr and Hf values. This finding indicates that, in addition to oxygen fugacity, the degree of evolution and water content are controlling parameters for metal abundance in magmas, especially in low oxygen fugacity porphyry Cu

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“…The K/Rb ratio in mica decreases with the degree of pegmatite-forming melt evolution, e.g., Černý et al, 1981;Foord et al, 1995;Li et al, 2015;Marchal et al, 2014. The Li vs. K/Rb ratio (Fig.…”

Section: Mica Composition As a Marker Of Magmatic Differentiationmentioning

confidence: 99%

The genesis of LCT-type granitic pegmatites, as illustrated by lithium isotopes in micas

2015

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International audienceIsotopic compositions in the Monts d’Ambazac Pegmatite Field (French Massif Central) exhibit a narrow range of mica δ7Li values, ranging from -3.6 to + 3.4‰. The value obtained in biotite from the host Saint Sylvestre granite falls within this range (δ7Li = -1.5‰). Lithium concentrations are consistent with the degree of magmatic evolution of each pegmatite type: from 630 ppm in Type II up to 13,500 ppm in the more evolved Type VI pegmatite. Although the rare-element contents e.g., Li, Cs, Ta of the micas are consistent with pegmatite differentiation, δ7Li (‰) are firstly, independent of the degree of magmatic differentiation (independent of pegmatite type) and secondly, independent of the content of Li and other flux-elements such as Be and Cs. Muscovite sampled in pegmatite V from the Chabannes locality is the only pegmatite to exhibit a δ7Li variation from intermediate unit (-1.7‰) to internal pegmatitic unit (+ 3.4‰). The nature of this δ7Li variation suggests that there was extensive fractional crystallisation during the pegmatite’s consolidation. The independence of δ7Li (‰) evolution from the degree of magmatic evolution and the presence of distinct major rare-element bearing phases throughout the pegmatite field tend to confirm that the δ7Li (‰) values recorded in mica are inherited from crustal source rocks common to the granite and pegmatite-forming melts. We propose that the distinct pegmatite subtypes (beryl columbite vs lepidolite-petalite subtypes) observed throughout the Monts d’Ambazac Pegmatite Field reflect the diverse contributions of crustal protoliths. The lack of evidence of surrounding alteration combined with the absence of increasing Li-content within the host granite tend to confirm that the δ7Li values obtained within this pegmatite field are primary, and that no Li-diffusional process and/or mixing-driven Li-isotope fractionation has overprinted these isotopic compositions. In light of these results, the process of partial melting of protoliths enriched in rare-element bearing phases, e.g., mica, garnet, seems to be more responsible for Li-isotope fractionation than Li-diffusion or fractional crystallisation at the temperature of pegmatite consolidation. Finally, we discuss the use of Li isotopic compositions to identify the most highly evolved pegmatitic systems

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In situ analyses of micas in the Yashan granite, South China: Constraints on magmatic and hydrothermal evolutions of W and Ta–Nb bearing granites

Cited by 105 publications

References 61 publications

Zircon U–Pb, molybdenite Re–Os and muscovite Ar–Ar isotopic dating of the Xitian W–Sn polymetallic deposit, eastern Hunan Province, South China and its geological significance

Zircon U–Pb, molybdenite Re–Os and muscovite Ar–Ar isotopic dating of the Xitian W–Sn polymetallic deposit, eastern Hunan Province, South China and its geological significance

Characteristics of Rare Earth Elements, Zr, and Hf in Ore‐Bearing Porphyries from the Western Awulale Metallogenic Belt, Northwestern China and their Application in Determining Metal Fertility of Granitic Magma

The genesis of LCT-type granitic pegmatites, as illustrated by lithium isotopes in micas

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