In situ LA–MC–ICP–MS U–Pb geochronology of igneous rocks in the Ashele Basin, Altay orogenic belt, northwest China: Constraints on the timing of polymetallic copper mineralization

Yang, Fuquan; Liu, Feng; Li, Qiang; Geng, Xinxia

doi:10.1016/j.jseaes.2013.10.022

Cited by 41 publications

(30 citation statements)

References 31 publications

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“…The Ashele Formation comprises a series of bimodal volcanics including basalt, rhyolite, dacitic tuff, dacitic breccia and agglomerate, subjected to greenschist facies metamorphism (Wei et al, 2007). Metamorphosed basaltic and rhyolitic tuff yielded corresponding zircon U-Pb ages of 388 Ma and 387 Ma, respectively (Yang et al, 2014). The Ashele basin is composed of a series of multiple overturned synclines that strike 50 km with axial planes dipping to northwest.…”

Section: Regional Geological Frameworkmentioning

confidence: 99%

“…The intermediate to felsic intrusions and basic dike swarm are widespread in the Altay Orogenic Belt, ranging from Ordovician through Permian to Triassic and even to Early Jurassic age. Except for the Ashele Cu-Zn deposit, the Ashele Formation hosts the Sarsuk Cu-rich polymetallic deposit and the Keyingde Cu deposit, as well as the Saidu and Duolanasayi orogenic gold deposits (Yang et al, 2014).…”

Section: Regional Geological Frameworkmentioning

confidence: 99%

“…@ 2.46%), Zn (0.43 Mt. @ 0.41%) and Au (27.2 t @ 0.36 g/t; Yang et al, 2014). Its geotectonic regime is supposed to be a Paleozoic arc-basin system (Wan et al, 2010a).…”

Section: Field Observation and Ore Texturesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Systematic studies on the mining field structures, ore geology, isotopic geochemistry and geochronology of the Ashele deposit were applied to constrain its VMS origin since its discovery (Chen et al, 1996;Li et al, 1998;Wang et al, 1998;Niu et al, 2006;Wan et al, 2010a;Yang et al, 2014). However, more recent exploration proved that some Cu-Pb-Zn lodes are situated in the second belt cross cutting the host rocks and layered ores, which is quite different from the typical VMS deposits (Yang et al, 2014). Additionally, Chang (1997) and Zheng et al (2015a) investigated the fluid characteristics of the Ashele and concluded that the compositional signatures of some primary fluid inclusions cannot be possible for sea-floor hydrothermal systems (Luders et al, 2001;Chen et al, 2007;Pirajno, 2009), but is in accordance with similar results from orogenic gold deposits instead.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Micro-textural and fluid inclusion data constraints on metallic remobilization of the Ashele VMS Cu-Zn deposit, Altay, NW China

Zheng

Wang

Chen

et al. 2016

Journal of Geochemical Exploration

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Section: Regional Geological Frameworkmentioning

confidence: 99%

Section: Regional Geological Frameworkmentioning

confidence: 99%

“…@ 2.46%), Zn (0.43 Mt. @ 0.41%) and Au (27.2 t @ 0.36 g/t; Yang et al, 2014). Its geotectonic regime is supposed to be a Paleozoic arc-basin system (Wan et al, 2010a).…”

Section: Field Observation and Ore Texturesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Micro-textural and fluid inclusion data constraints on metallic remobilization of the Ashele VMS Cu-Zn deposit, Altay, NW China

Zheng

Wang

Chen

et al. 2016

Journal of Geochemical Exploration

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Timing of formation of the Keketale Pb–Zn deposit, Xinjiang, Northwest China, Central Asian Orogenic Belt: Implications for the metallogeny of the South Altay Orogenic Belt

Yang

Chai

et al. 2017

Geological Journal

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The Keketale is the largest Pb–Zn deposit in the volcano‐sedimentary Maizi Basin of the South Altay Orogenic Belt (AOB), Northwest China. The stratabound orebodies are hosted in a suite of meta‐sedimentary rocks intercalated with volcanic rocks of the Lower Devonian Kangbutiebao Formation. The massive and banded ores representing the main mineralization stage are relatively well‐preserved in the ore district. This paper reports systematic geochronological results including the zircon laser ablation–multiple collector–inductively coupled plasma–mass spectrometry (LA‐MC‐ICP‐MS) U–Pb analyses on two meta‐felsic volcanic rocks from the Kangbutiebao Formation and Rb–Sr isotope dating on seven sphalerite samples from the main mineralization stage, together with some sulphur isotopic data to constrain the mineralization age and the genesis of the deposit. Rb–Sr isotope dating yield an isochron age of 398.2 ± 3.3 Ma generally synchronous with the zircon (LA‐MC‐ICP‐MS) U–Pb analyses of a meta‐rhyolite and a meta‐dacite from the strata (410.5 ± 1.3 Ma and 394.8 ± 1.9 Ma, respectively). The δ34S values of seven pyrite samples in the main massive and banded ores vary from −12.4‰ to −6.2‰, indicating that the main ore‐forming sulphur of the deposit was derived from bacterial reduction of seawater sulphate. By integrating the field, chronological, and isotopic evidences, we conclude that the Keketale Pb–Zn deposit is a VMS‐type deposit. Combining our results with the isotopic geochronology in the South AOB, we argue that the South AOB has undergone three mineralization episodes: the syndepositional mineralization (412–387 Ma), the subvolcanic hydrothermal‐related mineralization (382–379 Ma), and the epigenetic mineralization that is genetically linked to regional metamorphism and deformation (260–204 Ma). The Keketale Pb–Zn deposit is a product of the Devonian seafloor hydrothermal exhalation system in the South AOB.

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Petrogenesis and geodynamic significance of Kayinde gabbro in the Ashele Basin, Altay Orogenic Belt, Xinjiang, Northwest China: Constraints from geochronological and geochemical data

Yang

et al. 2020

Geological Journal

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Mafic‐ultramafic intrusions occur sporadically but are pivotal to constrain the tectonic evolution of the Chinese Altay, a key part of the Central Asian Orogenic Belt. The tectonic setting of the Early‐Middle Devonian is well documented, but that of the Late Devonian remains a matter of ongoing debate. The Kayinde gabbro occurs in the Ashele Basin of the South Altay. This paper reports petrologic, zircon U‐Pb geochronological, geochemical, and Sr‐Nd isotopic data of the Kayinde gabbro, with the aims to investigate its formation time, petrogenesis, and geodynamic significance. Zircons separated from the gabbro yield a cluster of concordant data points and a weighted mean age of 373.1 ± 4.1 Ma, representing a Late Devonian emplacement. Geochemically, the Kayinde gabbro is subalkaline, tholeiitic, and characterized by high Mg# values (68–73), enrichment in large‐ion lithophile elements (including Ba, Sr, Rb, and U), depletion in high‐field‐strength elements (including Nb, Ta, Zr, and Hf), fairly flat REE patterns, low (87Sr/86Sr)i (0.70366–0.70440) and positive εNd(t) (3.4–5.4) values. The geochemical characteristics collectively suggest that the Kayinde gabbro was derived from a spinel‐stable lithospheric mantle source, which was depleted by previous magma extraction and metasomatized by later slab‐derived fluids or melts in an island arc setting. The geochemical similarities between the Kayinde gabbro and other contemporary mafic‐ultramafic intrusions reveal that the subduction continued during the Late Devonian in the Chinese Altay. In combination with the published research, we favour a two‐unit arc system composed of a continental arc and an island arc, spanning across the Early to Late Devonian. The Ashele Basin can be considered to be an oceanward setting in this model.

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In situ LA–MC–ICP–MS U–Pb geochronology of igneous rocks in the Ashele Basin, Altay orogenic belt, northwest China: Constraints on the timing of polymetallic copper mineralization

Cited by 41 publications

References 31 publications

Micro-textural and fluid inclusion data constraints on metallic remobilization of the Ashele VMS Cu-Zn deposit, Altay, NW China

Micro-textural and fluid inclusion data constraints on metallic remobilization of the Ashele VMS Cu-Zn deposit, Altay, NW China

Timing of formation of the Keketale Pb–Zn deposit, Xinjiang, Northwest China, Central Asian Orogenic Belt: Implications for the metallogeny of the South Altay Orogenic Belt

Petrogenesis and geodynamic significance of Kayinde gabbro in the Ashele Basin, Altay Orogenic Belt, Xinjiang, Northwest China: Constraints from geochronological and geochemical data

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