Zircon U-Pb ages and geochemistry of the Wenquan Mo-bearing granitioids in West Qinling, China: Constraints on the geodynamic setting for the newly discovered Wenquan Mo deposit

Zhu, Laimin; Zhang, Guowei; Chen, Yanjing; Ding, Zhenju; Guo, Bo; Wang, Fei; Liu, Ben

doi:10.1016/j.oregeorev.2010.10.001

Cited by 96 publications

(71 citation statements)

References 84 publications

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“…The contacts between the enclave and host granite are sharp and irregular. The presence of enclaves is considered as evidence for magma mixing and suggests that juvenile basaltic material may have been involved in the melt, which is supported by some positive ε Hf (t) values (Qin et al ., ; Zhu et al ., ).…”

Section: Discussionmentioning

confidence: 97%

Episodic Triassic magmatism in the western South Qinling Orogen, central China, and its implications

et al. 2014

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The Qinling Orogen is located between the North China and South China cratons. The Mianlue Suture is the key boundary between the orogen and the South China Craton marking where the South China Craton subducted northward beneath the North China Craton during the late Triassic. Another older suture, the Shangdan Suture, divides the orogen into the North Qinling and South Qinling terranes. Our new geochronological data on eight granite plutons in the South Qinling Terrane indicate that the major phase of the Zhongchuan Granite is 219.5 ± 2.1 Ma, Luchuba is 217.1 ± 1.0 Ma, Baijiazhuang is 215.9 ± 3.0 Ma, Jiaochangba is 213.9 ± 1.7 Ma, Lvjing is 214.5 ± 2.1 Ma, Xiba is 215.6 ± 1.8 Ma, Wenquan is 217.3 ± 2.1 Ma and Fengxian is 240.9 ± 1.0 Ma. Compiled results reveal widespread magmatism began in the northwestern part of the South Qinling Terrane at ~240–250 Ma and episodically progressed to the southeast in the North Qinling Terrane. Magmatism was then widespread throughout the South Qinling Terrane during the Late Triassic. A new division of Triassic intrusions has been proposed across the Qinling Orogen based on critical geochemical and geochronological differences. First, the western part of the South Qinling Terrane, (western South Qinling suite), is significantly enriched in large ion lithophile elements, including Cs, Rb, U, Th and K, whereas the eastern part of the South Qinling Terrane, (eastern South Qinling suite), has moderate enrichment in these elements. Second, there is an obvious transition from calcium to potassium enrichment in the Late Triassic western‐South‐Qinling suite, whereas the Late Triassic eastern South Qinling suite appears to follow a curved trajectory starting from high Na through K to high Ca. Third, the Ba and Sr concentrations of the western South Qinling suite have marked troughs, whereas the eastern South Qinling suites have relative enrichment of the two elements. The source of the Triassic magma becomes increasingly juvenile towards the east‐southeast in the Qinling Orogen. Geochemical and isotopic data indicate that there are differences in the granites across the Chengxian–Huixian–Fengxian Fault within the western South Qinling Orogen, which highlight the tectonic significance of this northeast‐trending fault that is now recognized as a significant boundary within the orogen. The identification of such a large‐scale structure should attract some exploration attention, since this fundamental lineation is likely to be associated with some large mineral systems. Copyright © 2014 John Wiley & Sons, Ltd.

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Section: Discussionmentioning

confidence: 97%

Episodic Triassic magmatism in the western South Qinling Orogen, central China, and its implications

et al. 2014

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“…Abbreviations: FSY = Fangshanyu biotite monzogranite, HSY = Huashanyu biotite monzogranite, WY = Wengyu amphibole monzogranite. vein-style Mo deposits (e.g., Huanglongpu Mo deposit, 221.5 ± 0.3 Ma: Stein et al, 1997), and porphyry Mo deposits (e.g., Wenquan Mo deposit, 214.4 ± 7.1 Ma: Zhu et al, 2011) have all been reported. However, compared with the Late Jurassic-Early Cretaceous Au-Mo mineralization, the Triassic Au-Mo mineralization is less well documented and discussed.…”

Section: Introductionmentioning

confidence: 99%

Mineralogy, Fluid Characteristics, and Re-Os Age of the Late Triassic Dahu Au-Mo Deposit, Xiaoqinling Region, Central China: Evidence for a Magmatic-Hydrothermal Origin

et al. 2014

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The Dahu Au-Mo deposit is located in the Xiaoqinling region and belongs to the Qinling-Dabie orogen of central China. The quartz vein-style Dahu Au-Mo deposit (31 t Au, average grade: 4.7 g/t; 30,000 t Mo, average grade: 0.13 %) formed in four stages, i.e., an early quartz-K-feldspar stage (I), a pyrite-molybdenite stage (II), a sulfide-telluride-sulfosalt-gold stage (III), and a late carbonate-barite stage (IV). Abundant tellurides and sulfosalts occur in stage III: altaite, tellurobismuthite, buckhornite, hessite, petzite, calaverite, aikinite, kupcikite, lindstromite, salzburgite, wittichenite, and tetradymite. The system is characterized by carbono-aqueous fluids of low to moderate salinity and high oxygen fugacity. Total homogenization temperatures of the H2O-CO2 fluid inclusions in stage I and stage III quartz range from 230° to 440°C and 198° to 320°C, respectively. The variation in CO2/H2O ratios and microthermometric data of the H2O-CO2 fluid inclusions results from a combination of fluid unmixing and sequential trapping of fluid inclusions, but also from postentrapment reequilibration. Abundant minerals are present as solid phases in H2O-CO2 fluid inclusions in stage I quartz: Cu1.65S, covellite, chalcopyrite, bornite, molybdenite, pyrite, colusite, anhydrite, and celestine. δ 18 Oquartz values of stage I quartz range from 10.2 to 12.0‰, with calculated δ 18 Ofluid values ranging from 5.6 to 7.4‰. The δD values of fluid inclusion waters (thermal decrepitation) in stage I quartz range from -117 to -54‰. The low and scattered δD values reflect a mixture of ore-forming fluids trapped by the H2O-CO2 fluid inclusions at deep crustal levels and postmineralization fluids, possibly meteoric waters, trapped by secondary aqueous fluid inclusions at higher crustal levels during uplift of the Xiaoqinling core complex. Four molybdenite samples yield an Re-Os isochron age of 206.4 ± 3.9 Ma (MSWD = 0.88), suggesting ore formation in the Late Triassic. Metal signature, mineral association, fluid characteristics, and isotope data of the Dahu deposit, together with the tectonomagmatic setting, imply that the ore-forming fluids were derived from an unexposed and oxidized magmatic system, which likely stems from partial melting of enriched lithospheric mantle beneath the North China craton in a postcollisional extensional setting.

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“…In addition, direct LA-ICP-MS can give information to elucidate the geochemical processes (Himmler et al 2010). In its turn, when surface characterization is not necessary, the solid analysis is also advantageous, as no sample dissolution or specific preparation is required and high accuracy, precision, and sensitivity to be obtained (Zhu et al 2011;Yuan et al 2008), although the heterogeneity of the samples can be a problem. Compared to total dissolution, these methods simplify the process of sample preparation, but multiple steps and additives are still needed, which may induce loss of elements or result in contamination.…”

Section: Solid and Slurry Samplingmentioning

confidence: 99%

“…Since 2002, there has been a rapid growth in the number of publications using LA-ICP-MS for determination of REEs. Although total analysis of dissolved samples can give important information and is still widely employed in many works (Zhu et al 2011;Himmler et al 2010;Gonzáles-Á lvarez and Kerrich 2011), more recently, LA-ICP-MS has become well-established and has proven to be the preferred technique for geochemical studies (Orejana et al 2011;Janots, Berger, and Engi 2011;Li et al 2010;Mitchell, Wu, and Wang 2011;F. Y. Wu et al 2010;S.…”

Section: Solid and Slurry Samplingmentioning

confidence: 99%

Sample Preparation for Determination of Rare Earth Elements in Geological Samples by ICP-MS: A Critical Review

2012

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Zircon U-Pb ages and geochemistry of the Wenquan Mo-bearing granitioids in West Qinling, China: Constraints on the geodynamic setting for the newly discovered Wenquan Mo deposit

Cited by 96 publications

References 84 publications

Episodic Triassic magmatism in the western South Qinling Orogen, central China, and its implications

Episodic Triassic magmatism in the western South Qinling Orogen, central China, and its implications

Mineralogy, Fluid Characteristics, and Re-Os Age of the Late Triassic Dahu Au-Mo Deposit, Xiaoqinling Region, Central China: Evidence for a Magmatic-Hydrothermal Origin

Sample Preparation for Determination of Rare Earth Elements in Geological Samples by ICP-MS: A Critical Review

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