Origin and Geodynamic Implications of Concealed Granite in Shadong Tungsten Deposit, Xinjiang, China: Zircon U-Pb Chronology, Geochemistry, and Sr-Nd-Hf Isotope Constraint

Chen, Chao; Lü, Xinbiao; Wu, Chun‐Ming; Xiao, Jianru; Chen, Mao

doi:10.1007/s12583-017-0808-7

Cited by 25 publications

(12 citation statements)

References 62 publications

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“…The Rb-bearing granites in the Eastern Tianshan are characterized by high SiO 2 , Na 2 O, K 2 O Li, Rb, Cs and F, low Ti, Fe, Ca, Mg and P, Na 2 O > K 2 O, are weakly peraluminous (A/ NKC 1.00-1.11), low K/Rb, Al/Ga, Y/Ho, Zr/Hf and Nb/Ta ratios, and have low (La/Lu) N and deep Eu anomalies (Gu et al, 2003;Chen et al, 2018;Li T. G. et al, 2018;Muhtar et al, 2020a). They are generally highly evolved magmatic systems with abundant deuteric fluid exsolution and hydrothermal alteration occurring in the late magmatic stage.…”

Section: F-rich Fluid Exsolution and Magmatic-hydrothermal Transitionmentioning

confidence: 99%

Zircon Genesis and Geochronology for the Zhangbaoshan Super-Large Rubidium Deposit in the Eastern Tianshan, NW China: Implication to Magmatic-Hydrothermal Evolution and Mineralization Processes

et al. 2021

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The Zhangbaoshan (ZBS) super-large Rubidium deposit, located in the Eastern Tianshan, is a typical granite-type Rb deposit. The ZBS deposit is mainly hosted in the highly evolved Baishitouquan (BST) pluton enriched in F and Rb, which exhibits five lithological zones from the bottom to the top: leucogranite (zone-a), amazonite-bearing granite (zone-b), amazonite granite (zone-c), topaz-bearing amazonite granite (zone-d) and topaz albite granite (zone-e), as well as minor small lodes of amazonite pegmatite. Two types of zircon were identified from the BST pluton. Type-I zircons mainly occur in the zone–a, are characterized by obvious oscillatory zoning, high Zr contents (47.4–67.3 wt% ZrO2) and Zr/Hf ratios (21.72–58.23), low trace element concentrations, and heavy rare earth elements (HREE)–enriched patterns with prominent positive Ce anomalies (Ce/Ce* = 1.21–385) and strong negative Eu anomalies (Eu/Eu* = 0.008–0.551), indicative of early magmatic zircon. Type–II zircons mainly occur in the upper zones (zone-c to zone-e), exhibit porous and dark Cathodoluminescence images, inhomogeneous internal structure, plenty of mineral inclusions, low Zr (38.7–51.0 wt% ZrO2) and Zr/Hf ratios (3.35–11.00), high Hf (34,094–85,754 ppm), Th (718–4,980 ppm), U (3,540–32,901 ppm), Ta (86.7–398 ppm), Y (1,630–28,890 ppm) and rare earth elements (REEs) (3,910–30,165 ppm), as well as slightly HREE–enriched patterns and significant M–type tetrad patterns with t3 values (quantification factor of tetrad effect) of 1.51–1.69. It is suggested that the type–II zircons are crystallized from a deuteric F–rich fluid coexisted with the highly evolved residual magma during the transition from the magmatic to the F–rich hydrothermal stage of the BST pluton. The F–rich fluid exsolution during the magmatic–hydrothermal transition is one of the most important factors controlling the modification of highly evolved granite and related Rb enrichment and mineralization. The type–I zircon samples from zone–a yield concordant ages of 250 ± 2.5 Ma and 250.5 ± 1.7 Ma, respectively, indicating that the BST pluton was emplaced in the Early Triassic. The type–II zircons from zone–c to zone–e yield lower intercept U–Pb ages between 238 and 257 Ma, which may represent the age of F–rich fluid–melt interaction during the transition from the magmatic to the hydrothermal stage. The mineralization of the ZBS super–large Rb deposit should have occurred shortly after emplacement of the BST pluton in the Early Triassic. Combined with available data, it is suggested that the Triassic is an important period for granitic magmatism and rare metal metallogeny in the Eastern Tianshan.

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Section: F-rich Fluid Exsolution and Magmatic-hydrothermal Transitionmentioning

confidence: 99%

Zircon Genesis and Geochronology for the Zhangbaoshan Super-Large Rubidium Deposit in the Eastern Tianshan, NW China: Implication to Magmatic-Hydrothermal Evolution and Mineralization Processes

et al. 2021

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“…Procedural blanks were 5–8 × 10 −11 g, and analytical results are reported with 1σ error. Details of the isotopic measurement methodology can be found in Karsli, Chen, Aydin, and Şen (), Chen, Lü, Wu, Jiang, and Mao (), and Liu, Zhang, Zhang, and Jiang (). The Sm–Nd isotopic parameters were calculated following the procedures described in Möller, Mezger, and Schenk ().…”

Section: Sampling and Analytical Techniquesmentioning

confidence: 99%

“…Procedural blanks were 5-8 × 10 −11 g, and analytical results are reported with 1σerror. Details of the isotopic measurement methodology can be found inKarsli, Chen, Aydin, and Şen (2007),Chen, Lü, Wu, Jiang, and Mao (2018),and Liu, Zhang, Zhang, and Jiang (2018). The Sm-Paragenetic sequences of minerals and fluid inclusion assemblages in the Huangshaping deposit (afterLi, Yonezu, et al, 2017).…”

mentioning

confidence: 99%

Genesis of the Huangshaping W–Mo–Cu–Pb–Zn deposit, South China: Role of magmatic water, metasomatized fluids, and basinal brines during intra‐continental extension

Palinkaš

Evans

et al. 2019

Geological Journal

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The Huangshaping world‐class W–Mo–Cu–Pb–Zn deposit formed during Jurassic intra‐continental extension in the central Nanling region (South Hunan), South China. In order to assess the role of fluids in ore genesis and the origin of polymetallic mineralization, three types of mineralized porphyries (quartz porphyry, granophyre, and granite porphyry) were studied. The multi‐method approach included whole‐rock Sr–Nd isotopic geochemistry and determination of the trace element content and gaseous and aqueous composition of ore minerals from the three stages of intrusion and ore emplacement. Geochemical results show that the Sr–Nd isotopes in these altered porphyries were strongly affected by fluid metasomatism. The 87Sr/86Sr and 147Sm/144Nd ratios for the quartz porphyry and granophyre range from 0.72894 to 0.83093 and 0.1524 to 0.2080, respectively, whereas higher and considerably more variable ratios were determined for the granite porphyry (0.90396 to 1.51943 and 0.2391 to 0.2914). These observations imply that granite porphyry‐associated W–Mo mineralization underwent more intensive fluid–rock interaction. The relatively low REE concentrations and high abundances of CH4 and H2 in the Cu ores associated with the quartz porphyry unambiguously suggest a deep‐sourced magmatic fluid for the Cu mineralization. The high REE concentrations, pronounced negative Eu anomalies, M‐type tetrad effects, and high CO2, H2O, and Ca2+ contents of the W–Mo ores associated with the granite porphyry imply that the W–Mo polymetallic mineralization was formed in a relatively oxidizing, high‐temperature environment with strong metasomatism. In contrast, the slightly negative Eu anomalies, W‐type tetrad effects, low CH4, and high F− and Cl− concentrations of the Pb–Zn ores indicate involvement of a sediment‐derived basinal brine and reducing mineralization conditions. Collectively, a three‐stage genetic model is proposed for the Huangshaping polymetallic deposit. Corresponding to initiation, development, and cessation of Jurassic intra‐continental extension, magmatic water, metasomatized fluids, and basinal brines played key sequential roles in Cu, W–Mo, and Pb–Zn mineralization.

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“…The crystalline basement is represented by the Mesoproterozoic Xingxingxia and Kawabulag groups and the Neoproterozoic Tianhu Group, and mainly has been metamorphosed to upper greenschist or amphibolite facies (Lei et al, ; Liu, Guo, Zhang, Li, & Zheng, ). In this region, a significant number of W–(Mo), Fe, Au, and Pb–Zn deposits have been discovered, including the large‐ to medium‐size skarn tungsten (W) deposits at Shadong (Chen, Lv, Wu, Jiang, & Mao, ) and Xiaobaishitou (Deng et al, ), the V–Ti magnetite deposit at Weiya (Shi, Wang, Wang, Li, & Gao, ), the sedimentary–metamorphic Fe deposit at Tianhu (Zheng et al, ), the large‐size epithermal gold deposit at Mazhuangshan (Chen et al, ), and the giant‐size Caixiashan Pb–Zn deposit (Li et al, ).…”

Section: Regional Geologymentioning

confidence: 99%

“…The Devonian granites are present in the Sidingheishan, Jingerquan, Xianshuiquan of Juluotage region, and Kalatag district (Mao, ; Shi, Liao, Li, Zhang, & Zhang, ; Tang et al, ; Zhou et al, ). There are also Triassic intrusions, including Shadong granite, Donggebi porphyry, Baishan porphyry, and the Weiya magmatic mafic–ultramafic complexes (Chen, Lv, et al, ; Deng et al, ; Wu, Zhou, Li, & Chen, ; Zhang et al, ).…”

Section: Regional Geologymentioning

confidence: 99%

Petrogenesis of Early Devonian granodiorite in the Xiaobaishitou W–(Mo) ore district of East Tianshan, Northwest China, and tectonic implications: U–Pb geochronological, geochemical, and Sr–Nd isotopic evidence

Yang

Zhang

2019

Geological Journal

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The Palaeozoic intrusions of East Tianshan, China, are important for understanding the tectonic evolution of the Central Asian Orogenic Belt. We investigated one such Devonian granodiorite, located in the Xiaobaishitou W-(Mo) ore district of the Central Tianshan Block, to constrain its petrogenesis and geodynamic setting. Laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) zircon U-Pb dating indicates that the granodiorite emplaced at 407 Ma and can be classified as an I-type granite based on its mineralogy and whole-rock geochemistry. The granodiorite also exhibits moderate Mg # values, high MgO, Ni, and CaO contents, depleted Ti and Nb concentrations, and negative ε Nd (t) values (−8.32 to −3.73), indicating a magma derived from the mantle but contaminated with ancient crustal rock. Mineral chemistry, saturation thermometry, and whole-rock Fe 2 O 3 /FeO ratios indicate crystallisation temperatures of 654-822°C, pressures of 1.8-2.1 kbar, and oxygen fugacity of ≤NNO for the granodiorite stock. We compare granodiorite geochemical data to those from other recent studies of Palaeozoic intrusive rocks in East Tianshan and infer that the formation of the Early Devonian granodiorite in the East Tianshan was due to a southdipping subduction of the Kanggur Ocean plate toward the Central Tianshan Block.

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Origin and Geodynamic Implications of Concealed Granite in Shadong Tungsten Deposit, Xinjiang, China: Zircon U-Pb Chronology, Geochemistry, and Sr-Nd-Hf Isotope Constraint

Cited by 25 publications

References 62 publications

Zircon Genesis and Geochronology for the Zhangbaoshan Super-Large Rubidium Deposit in the Eastern Tianshan, NW China: Implication to Magmatic-Hydrothermal Evolution and Mineralization Processes

Zircon Genesis and Geochronology for the Zhangbaoshan Super-Large Rubidium Deposit in the Eastern Tianshan, NW China: Implication to Magmatic-Hydrothermal Evolution and Mineralization Processes

Genesis of the Huangshaping W–Mo–Cu–Pb–Zn deposit, South China: Role of magmatic water, metasomatized fluids, and basinal brines during intra‐continental extension

Petrogenesis of Early Devonian granodiorite in the Xiaobaishitou W–(Mo) ore district of East Tianshan, Northwest China, and tectonic implications: U–Pb geochronological, geochemical, and Sr–Nd isotopic evidence

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