Geological and geochemical constraints on genesis of the Liziyuan gold-dominated polymetal deposit, western Qinling orogen, central China

Yang, Tao; Zhu, Laimin; Zhang, Guowei; Wang, Fei; Lu, Rukun; Xia, Jichao; Zhang, Yongqiang

doi:10.1080/00206814.2012.704673

Cited by 24 publications

(16 citation statements)

References 76 publications

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“…) and is dated to have formed at 209 ± 5 Ma using a SHRIMP U–Pb method on the xenotime and monazite in the ores (Zhou et al ., ). The Liziyuan Au–Ag deposit and the Ma'anqiao Au deposit are located at the northern margin of the SQL and have been constrained to be of Triassic age (Zhu et al ., ; Yang et al ., , ).…”

Section: Triassic Mineralizationmentioning

confidence: 99%

Triassic tectonics and mineral systems in the Qinling Orogen, central China

2014

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The Qinling Orogen in central China preserves the records of a complex geological and tectonic history, and also carries abundant mineral resources. Previous investigations on the Qinling Orogen have identified that the final transition from the Palaeo‐Tethys Ocean to a continental orogen occurred in the Triassic, although the timing of the oceanic closure and the tectonic affinity of the Triassic Qinling belt have been poorly constrained. In this contribution, we compile the palaeomagnetic data and geological evidence related to sedimentation, magmatism and mineral systems. The palaeomagnetic data show that the Palaeo‐Tethys Ocean in the Qinling Orogen gradually closed westward during the Triassic, terminating in the beginning of the Jurassic. Triassic strata are widely developed in the Qinling Orogen and conformably overlie the Permian strata. They are composed of carbonates and siliciclastic rocks that were strongly deformed and weakly metamorphosed during the Late Triassic to Late Jurassic. The Triassic magmatic rocks are dominated by I‐type granitoids, with subordinate S‐type and alkaline granites and minor carbonatite dykes, with a clear northward transition in lithology and geochemical features from the Mian‐Lue Suture. Different types of Triassic mineral systems have been reported from this region, including sedimentary‐hosted epizonogenic hydrothermal Hg–Sb, Pb–Zn ± Ag, Au deposits, metamorphic hydrothermal lodes of Au, Ag–Pb–Zn, Mo–Au and Mo, magmatic hydrothermal systems including porphyry Mo, breccia pipe Au, and carbonatite‐hosted Mo deposits. We infer that the Triassic Qinling Orogen witnessed synchronous oceanic plate subduction in the west and continental linkage in the east, with a transition from oceanic basin to continental orogen through gradual subduction‐related consumption of the oceanic plate. The Palaeo‐Tethys Ocean closed in a westward scissor‐like fashion in the Triassic and continental collision and extensive crustal shortening in the Jurassic, following which post‐collisional extension occurred in the Early Cretaceous. Copyright © 2014 John Wiley & Sons, Ltd.

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Section: Triassic Mineralizationmentioning

confidence: 99%

Triassic tectonics and mineral systems in the Qinling Orogen, central China

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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“…They are also consistent with δ 34 S values of calc-alkaline and alkaline intrusions within the NCC (2.5‰-4.6‰ with a mean value of 3.6‰; Nie et al, 2004). These δ 34 S values differ from those typically found within orogenic gold systems, such as granite-hosted orogenic gold deposits within the east Shandong (or Jiaodong) area of the NCC (6.8‰-9.3‰; Qiu et al, 2002;Mao et al, 2008), at the Hunt Mine at Kambalda in the Yilgarn Craton of Western Australia (3.8‰-7.2‰, Yang et al, 2012), at the Sawayaerdun gold deposit in the Tianshan area of northwest China (−1.8‰ to 0.9‰; Chen et al, 2012), and within the Juneau gold belt of southeastern Alaska (− 17.8‰ to 1.2‰; Goldfarb et al, 1991). These values are consistent with a deep-seated source of sulfur that originated from either metamorphic rocks or igneous intrusions (Ohmoto and Rye, 1979;Ohmoto, 1986).…”

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confidence: 67%