Structural and geochronological studies on the Liba goldfield of the West Qinling Orogen, Central China

Zeng, Qingtao; McCuaig, T. Campbell; Hart, Craig J.R.; Jourdan, Fred; Muhling, Janet R.; Bagas, Leon

doi:10.1007/s00126-011-0398-8

Cited by 70 publications

(40 citation statements)

References 22 publications

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“…Li et al, 2012a), while the Triassic Au-Mo mineralization is related to final collision between the North China craton and the Yangtze craton, and the subsequent postcollisional extensional process. Triassic quartz vein-style Au deposits (e.g., Liba Au deposit, ~216 Ma: Zeng et al, 2012; Liziyuan Au deposit, ~229 Ma: T. Yang et al, 2013), quartz vein-style Au-Mo deposits (e.g., Majiawa Au-Mo deposit, 232 ± 11 Ma: Y.T. Wang et al, 2010; Dahu Au-Mo deposit), quartz vein-style Mo deposits (e.g., Qianfangling Mo deposit, 239 ± 13 Ma, and a number of Mo occurrences in the Songxian County: Gao et al, 2010), carbonatite-related 0361-0128/15/4278/119-27 Hu et al, 1994;Mao et al, 2002;J.…”

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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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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“…Some geologists interpreted the WQLG to be dominated by Carlin‐type or Carlin‐like deposits (Li and Peters, ; Kerrich et al ., ; Chen et al ., ). On the contrary, other researchers (Mao et al ., ; Zhou et al ., ; Yang et al ., ; Zeng et al ., ) considered the WQLG to be an orogenic gold province. In addition, Chen et al .…”

Section: Introductionmentioning

confidence: 99%

Geology, geochemistry and genesis of the Huachanggou gold deposit, western Qinling Orogen, central China

2014

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The large Huachanggou gold deposit, on the southern margin of the Mian‐Lue Suture in western Qinling Orogen (central China), is hosted in the Devonian Sanhekou Group composed of spilite, limestone and phyllite. The mineralization is considered to have occurred in three stages: (1) Early quartz–pyrite veins, (2) Middle quartz–sulphides veins, and (3) Late carbonate–quartz veinlets, with gold being introduced mainly in the second stage. Quartz formed in the two earlier stages contains four types of fluid inclusions, namely (1) Pure CO2, (2) CO2–H2O, (3) Solid‐bearing and (4) NaCl–H2O, whereas the late‐stage minerals contain only the NaCl–H2O inclusions. The inclusions in quartz formed in the early‐, middle‐ and late stages have yielded total homogenization temperatures of 272−385 °C, 232−395 °C and 118−228 °C, respectively, with salinities no higher than 12 wt.% NaCl equiv. For the middle‐stage, trapping pressures estimated from the CO2–H2O inclusions for the altered spilite‐type (123−326 MPa) and quartz vein‐type (132−342 MPa) orebodies correspond to mineralization depths of 12 km and 13 km, respectively. We suggest that fluid boiling and mixing may have caused rapid precipitation of metallic sulphides and native gold. Through boiling and influx of meteoric water, the ore‐forming fluid system has evolved from CO2‐rich to CO2‐poor and from metamorphic to meteoric, as indicated by the decreasing δ18Owater values from the early‐ to late stages. Integrating the evidence obtained from regional geology, ore deposit geology, fluid inclusion and C–H–O isotope geochemistry, we conclude that the Huachanggou gold deposit is best ascribed to be an orogenic‐type system formed in the tectonic setting of the north‐vergent oceanic plate subduction along the Mian‐Lue Suture during the Late Triassic. Copyright © 2014 John Wiley & Sons, Ltd.

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“…Analyses on quartz from auriferous quartz vein has an Ar–Ar plateau age of 232.6 ± 1.6 Ma with an isochron age of 222.1 ± 3.5 Ma for the Baguamiao orogenic gold deposit, and a plateau age of 210.6 ± 1.26 Ma with an isochron age of 205.02 ± 3.53 for the Liba orogenic gold deposit (Feng et al ., ). It has been reported recently that the Ar–Ar ages on three muscovite samples from gold ore in the Liba orogenic deposit are indistinguishable in age at 215.6 ± 1.3 Ma (Zeng et al ., ). The statistical age data for Carlin‐type and orogenic gold deposits in the Western Qinling indicates that the ore‐forming ages concentrated between 100 to 220 Ma (Chen et al ., and references therein).…”

Section: Discussionmentioning

confidence: 99%

Geochronology, petrogenesis and tectonic implications of the Zhongchuan granitic pluton in the Western Qinling metallogenic belt, China

et al. 2012

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The Zhongchuan district is an important component of the metallogenic belt in the Western Qinling. The Zhongchuan granite pluton occurring in the centre of the Zhongchuan metallogenic area has been poorly constrained, though the Triassic granite in Western Qinling has been well documented. In‐situ zircon U–Pb ages, Hf isotopic compositions and whole‐rock geochemical data are presented for host granite and mafic microgranular enclaves (MMES) from the Zhongchuan pluton, in order to constrain its sources, petrogenesis and tectonic setting of the pluton. The distribution of major, trace and rare earth elements apparently reflect exchange between the MMES and the host granitic rocks mainly due to interactions between coeval felsic host magma and mafic magma. The zircon U–Pb age of host granite (231.6 ± 1.5 to 235.8 ± 2.3 Ma) has overlapping uncertainty with that of the MMES (236.6 ± 1.3 Ma), establishing that the mafic and felsic magmas were coeval. The Hf isotopic composition of the MMES (εHf(t) = −13.4 to 4.0) is distinct from the host granite (εHf(t) = −15.7 to 0.0), indicating that both enriched subcontinental lithosphere mantle (SCLM) and crustal sources contributed to their origin. The zircons have two‐stage Hf model ages of 1064 to 1798 Ma for the host granite and 858 to 1747 Ma for the MMES. This suggests that the granitic pluton was likely derived from partial melting of a Late Mesoproterozoic crust, with subsequent interaction with the SCLM‐derived mafic magmas in tectonic affinity to the South China Block. Copyright © 2012 John Wiley & Sons, Ltd.

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Structural and geochronological studies on the Liba goldfield of the West Qinling Orogen, Central China

Cited by 70 publications

References 22 publications

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

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

Geology, geochemistry and genesis of the Huachanggou gold deposit, western Qinling Orogen, central China

Geochronology, petrogenesis and tectonic implications of the Zhongchuan granitic pluton in the Western Qinling metallogenic belt, China

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