Petrogenesis of Ore-Hosting Diorite in the Zaorendao Gold Deposit at the Tongren-Xiahe-Hezuo Polymetallic District, West Qinling, China

Gou, Zong Yang; Yu, Hao; Qiu, Kun‐Feng; Geng, Jian Zhen; Wu, Mingqian; Wang, Yong Gang; Yu, Ming Hai; Li, Jun

doi:10.3390/min9020076

Cited by 19 publications

(16 citation statements)

References 52 publications

(97 reference statements)

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“…In the EKO, both Nan'getan granodiorites (~243 Ma) and Wulonggou granodiorite (246-248 Ma) in the NEKT show island arc-related features, including low Sr/Y and high Y and formed in an arc setting [17,78]. Haishigou volcanic lavas (244-245 Ma) in the NEKT show high-K calc-alkaline rocks, LILE enrichment and HFSE depletion, as well as high initial 87 Sr/ 86 Sr ratios and moderately negative ε Nd (t) values, indicating a continent-type magma source [79][80][81]. The Halagatu granitoid plutons (248-244 Ma) in the SEKT, characterized by high-K, calc-alkalinity and metaluminous to peraluminous areas with negative Nb-Ta and Ti anomalies, were generated in a continental arc setting [66].…”

Section: The Geodynamic Background For the Magmatismmentioning

confidence: 99%

Geochronology and Geochemistry of Ore-Hosting Rhyolitic Tuff in the Kengdenongshe Polymetallic Deposit in the Eastern Segment of the East Kunlun Orogen

et al. 2019

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The Kengdenongshe Au–Ag–Pb–Zn polymetallic deposit, a newly discovered large-scale polymetallic deposit in the southeastern section of the East Kunlun Orogen (EKO), contains an Au resource of 40 t, Ag resource of 690 t and Pb–Zn resource of 10.5 × 105 t. The ore-bearing rocks are mainly composed of laminar barite and rhyolitic tuff. In this study, LA-ICP-MS zircon U–Pb dating and whole rock major and trace elements analyses have been conducted on the ore-bearing rhyolitic tuff. LA-ICP-MS zircon U–Pb dating data show that these rhyolitic tuffs were emplaced at ca. 243.3 ± 1.6 Ma. The samples show similar features to those of S-type granites, including high contents of SiO2 (76.4–82.6 wt. %) and Al2O3 (11.0–12.7 wt. %) and relatively low concentrations of Na2O (0.35–2.43 wt. %) and CaO (0.095–0.124 wt. %), with high A/CNK (molar [Al2O3/(CaO + Na2O + K2O)]) (1.72–2.03) and K2O/Na2O ratios (1.41–17.1). Further, they exhibit depletion in HFSEs (High Field Strength Elements) and enrichment in LREEs (Light Rare Earth Element) with negative Eu anomalies (Eu/Eu* = 0.51–0.64). These geochemical characteristics indicate that the Kengdenongcuo rhyolitic tuff originated from the fluid-absent melting of a plagioclase-poor, clay-rich metapelitic source and experienced minor fractional crystallization. In combination with arc-type magmatism and contemporaneous syn-collision granitoids in the region, the Kengdenongcuo tuff formed in a continental collision setting, implying that the Bayan Har–Songpan Ganzi Terrane collided with the East Kunlun Terrane and the Paleo-Tethys Ocean was closed at the period of ~243 Ma. The Kengdenongcuo polymetallic deposit formed at about the same time.

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Section: The Geodynamic Background For the Magmatismmentioning

confidence: 99%

Geochronology and Geochemistry of Ore-Hosting Rhyolitic Tuff in the Kengdenongshe Polymetallic Deposit in the Eastern Segment of the East Kunlun Orogen

et al. 2019

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“…The sedimentary rocks are intruded by the numerous Mesozoic granitic intrusions Feng et al, 2003;Gou et al, 2019;Li et al, 2019), which have been recognized in connection with the final closure of the Palaeo-Tethys Ocean basin and a scissorlike collision between the South China Block and North China Craton (Chen & Santosh, 2014;Dong et al, 2011;Qiu & Deng, 2017). Holistic geological, geophysical, and geochronological data suggest that the evolution of the Palaeo-Tethys Ocean witnessed the northward subduction of Palaeo-Tethys Ocean slab at ca.…”

Section: Geological Backgroundmentioning

confidence: 99%

“…Qiu and Deng (2017) suggested the Dewulu mafic microgranular enclaves (MME) related to previously modified by slab-derived melt during the continuous northward subduction of the Palaeo-Tethys oceanic slab. Gou et al (2019) proposed the ore-hosting diorite at Zaorendao formed in an active continental margin that was associated with the northward subduction of the Palaeo-Tethys Ocean.…”

Section: Introductionmentioning

confidence: 99%

Geochronology and geochemistry of the Yidi'nan quartz diorite in the West Qinling, China: Implications for evolution of the Palaeo‐Tethys Ocean

Wang

et al. 2020

Geological Journal

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The Xiahe-Hezuo polymetallic district, located the northwest portion of the West Qinling orogen, has a wide distribution of granitoid rock. Thus, information on the widespread Triassic granitoids in this area is important to constrain the tectonomagmatic processes. However, the tectonic setting and genetic mechanism for the granitoids in this area are still controversial. In this study, we present a detailed description of zircon U-Pb ages, whole-rock geochemistry, and Hf isotopes for the Yidi'nan quartz diorite and elucidate their petrogenesis and geodynamic implications.The quartz diorite was crystallized at 240.6 ± 1.8 Ma, based on its zircon U-Pb age.The quartz diorite belongs to the high-K calc-alkaline, metaluminous, I-type granites and its fractionated REE patterns show enrichment of Rb, U, and Th, depletion of Ba, Sr, Nb, and Ta, and negative Eu. The zircons have negative ε Hf (t) values in a range of −7.66 to −2.72, corresponding to two-stage model ages ranging from 1.66 to 1.48 Ga. The integrated data from petrology, geochronology, and bulk geochemistry suggest that the quartz diorite is formed along an active continental margin, and from the partial melting of the Lower Proterozoic crust. It is associated with the Palaeo-Tethys oceanic crust that suffered northward subduction beneath the South Qinling Block from Permian to Early Triassic.

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“…All zircon grains from different types of porphyry samples are euhedral-subhedral in shape and transparent or pale brown in color, and exhibit marked oscillatory growth zoning in CL images ( Figure 5). Most of them have high Th/U ratios (0.3-1.7; Table S1), indicating their magmatic origin [45][46][47][48][49][50]. For sample PL-1, the 206 Figure 6C) and a weighted mean age of 219 ± 1 Ma (2σ, MSWD = 1.18, N = 21; Figure 6C).…”

Section: Zircon U-pb Datingmentioning

confidence: 99%

Geological, Geochronological, and Geochemical Insights into the Formation of the Giant Pulang Porphyry Cu (–Mo–Au) Deposit in Northwestern Yunnan Province, SW China

et al. 2019

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The giant Pulang porphyry Cu (–Mo–Au) deposit in Northwestern Yunnan Province, China, is located in the southern part of the Triassic Yidun Arc. The Cu orebodies are mainly hosted in quartz monzonite porphyry (QMP) intruding quartz diorite porphyry (QDP) and cut by granodiorite porphyry (GP). New LA-ICP-MS zircon U–Pb ages indicate that QDP (227 ± 2 Ma), QMP (218 ± 1 Ma, 219 ± 1 Ma), and GP (209 ± 1 Ma) are significantly different in age; however, the molybdenite Re–Os isochron age (218 ± 2 Ma) indicates a close temporal and genetic relationship between Cu mineralization and QMP. Pulang porphyry intrusions are enriched in light rare-earth elements (LREEs) and large ion lithophile elements (LILEs), and depleted in heavy rare-earth elements (HREEs) and high field-strength elements (HFSEs), with moderately negative Eu anomalies. They are high in SiO2, Al2O3, Sr, Na2O/K2O, Mg#, and Sr/Y, but low in Y, and Yb, suggesting a geochemical affinity to high-silica (HSA) adakitic rocks. These features are used to infer that the Pulang HSA porphyry intrusions were derived from the partial melting of a basaltic oceanic-slab. These magmas reacted with peridotite during their ascent through the mantle wedge. This is interpreted to indicate that the Pulang Cu deposit and associated magmatism can be linked to the synchronous westward subduction of the Ganzi–Litang oceanic lithosphere, which has been established as Late Triassic.

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Petrogenesis of Ore-Hosting Diorite in the Zaorendao Gold Deposit at the Tongren-Xiahe-Hezuo Polymetallic District, West Qinling, China

Cited by 19 publications

References 52 publications

Geochronology and Geochemistry of Ore-Hosting Rhyolitic Tuff in the Kengdenongshe Polymetallic Deposit in the Eastern Segment of the East Kunlun Orogen

Geochronology and Geochemistry of Ore-Hosting Rhyolitic Tuff in the Kengdenongshe Polymetallic Deposit in the Eastern Segment of the East Kunlun Orogen

Geochronology and geochemistry of the Yidi'nan quartz diorite in the West Qinling, China: Implications for evolution of the Palaeo‐Tethys Ocean

Geological, Geochronological, and Geochemical Insights into the Formation of the Giant Pulang Porphyry Cu (–Mo–Au) Deposit in Northwestern Yunnan Province, SW China

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