Early Cretaceous bimodal volcanism in the Duolong Cu mining district, western Tibet: Record of slab breakoff that triggered ca. 108–113 Ma magmatism in the western Qiangtang terrane

Wei, Shaogang; Tang, Juxing; Song, Youjian; Liu, Zhibo; Feng, Jufu; Li, Yanbo

doi:10.1016/j.jseaes.2016.12.010

Cited by 43 publications

(32 citation statements)

References 89 publications

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“…This is compatible with what been observed in the Early Cretaceous Fuye pluton, Caima pluton and Qingcaoshan pluton in the Qiangtang Terrane [53]. In contrast, ε Nd (t) and ε Hf (t) value and Hf isotope model ages of the Early Cretaceous (~126-116 Ma) magmatic rocks from the Duolong district indicate they were probably derived from magma as a mixture of the juvenile lower crust and mature crustal materials [9]. In addition, previous studies on Pb isotopic compositions of the porphyry intrusions, sulfides, and sulfate in the Tiegelongnan deposit suggest that the Pb of this deposit is mainly derived from a crust-mantle mixed subduction zone [26,54,55].…”

Section: Magmatism Indication Of Tectonic Setting In the Duolong Distsupporting

confidence: 88%

“…They were also interpreted to be bathyal to abyssal flysch succession, implying a stable shallow-marine continental-shelf sedimentary environment along the southern continental margin of the South Qiangtang terrane [10]. Furthermore, Wei et al (2017) [9] proposed that a continental margin arc setting in the southern Qiangtang terrane during the Early Cretaceous. Regional geological map of the Duolong ore cluster, modified after [8], ages are from [17].…”

Section: Minerals 2018 8 X For Peer Review 3 Of 17mentioning

confidence: 99%

“…The Jurassic to Lower Cretaceous (<125 Ma) marine sedimentary rocks were transposed, intruded by granitoids, and were uplifted above sea level before around 118 Ma [40]. The extensive magmatism in the Duolong district is associated with the Qiangtang-Lhasa collision event [9,37].…”

Section: Magmatism Indication Of Tectonic Setting In the Duolong Distmentioning

confidence: 99%

“…Thus, it suggests that plenty of juvenile crust materials are involved in the intrusions in the Tiegelongnan porphyry Cu (Au) deposit. The juvenile crust materials have been becoming gradually dominated during the Late Mesozoic since the vertical growth and thickening of the continental crust of the southern Qiangtang terrane during the Early Cretaceous [9,56]. It is commonly accepted that variable sources conjunctly contributed to the formation of magma in this district [53].…”

Section: Magmatism Indication Of Tectonic Setting In the Duolong Distmentioning

confidence: 99%

“…Despite numerous studies on the metallogeny of the Tiegelongnan deposit, the tectonic control of this type deposit has rarely been demonstrated. Formation of the porphyry and epithermal deposits in the Duolong district was indicated to be associated with the magma arising from the closure of the Bangong-Nujiang Ocean (BNO) in the Early Cretaceous [8,9]. However, how the tectonic activities control the formation of the porphyry Cu system is controversial.…”

Section: Introductionmentioning

confidence: 99%

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Tectonic Control, Reconstruction and Preservation of the Tiegelongnan Porphyry and Epithermal Overprinting Cu (Au) Deposit, Central Tibet, China

et al. 2018

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The newly discovered Tiegelongnan Cu (Au) deposit is a giant porphyry deposit overprinted by a high-sulfidation epithermal deposit in the western part of the Bangong–Nujiang metallogenic belt, Duolong district, central Tibet. It is mainly controlled by the tectonic movement of the Bangong–Nujiang Oceanic Plate (post-subduction extension). After the closure of the Bangong–Nujiang Ocean, porphyry intrusions emplaced at around 121 Ma in the Tiegelongnan area, which might be the result of continental crust thickening and the collision of Qiangtang and Lhasa terranes, based on the crustal radiogenic isotopic signature. Epithermal overprinting on porphyry alteration and mineralization is characterized by veins and fracture filling, and replacement textures between two episodes of alteration and sulfide minerals. Alunite and kaolinite replaced sericite, accompanied with covellite, digenite, enargite, and tennantite replacing chalcopyrite and bornite. This may result from extension after the Qiangtang–Lhasa collision from 116 to 112 Ma, according to the reopened quartz veins filled with later epithermal alteration minerals and sulfides. The Tiegelongnan deposit was preserved by the volcanism at ~110 Ma with volcanic rocks covering on the top before the orebody being fully weathered and eroded. The Tiegelongnan deposit was then probably partly dislocated to further west and deeper level by later structures. The widespread post-mineral volcanic rocks may conceal and preserve some unexposed deposits in this area. Thus, there is a great potential to explore porphyry and epithermal deposit in the Duolong district, and also in the entire Bangong–Nujiang metallogenic belt.

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Section: Magmatism Indication Of Tectonic Setting In the Duolong Distsupporting

confidence: 88%

Section: Minerals 2018 8 X For Peer Review 3 Of 17mentioning

confidence: 99%

Section: Magmatism Indication Of Tectonic Setting In the Duolong Distmentioning

confidence: 99%

Section: Magmatism Indication Of Tectonic Setting In the Duolong Distmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Tectonic Control, Reconstruction and Preservation of the Tiegelongnan Porphyry and Epithermal Overprinting Cu (Au) Deposit, Central Tibet, China

et al. 2018

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Zircon U–Pb ages, geochemistry, and Sr–Nd–Pb–Hf isotopes of the Mugagangri monzogranite in the southern Qiangtang of Tibet, western China: Implications for the evolution of the Bangong Co‐Nujiang Meso‐Tethyan Ocean

et al. 2021

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We present in‐situ zircon laser ablation‐inductively coupled plasma‐mass spectrometry (LA‐ICP‐MS) U–Pb ages, whole‐rock geochemistry, and Sr–Nd–Pb–Hf isotopes of the Mugagangri monzogranite in the southern margin of the Qiangtang Block, Tibet, western China. The zircons yield a U–Pb age of ca. 123 Ma. The hornblende‐bearing monzogranite shows metaluminous to weak peraluminous and high‐K calc‐alkaline characteristics exemplified by high silica (SiO2 = 67.57–70.57 wt%), high aluminium (Al2O3 = 14.68–15.78 wt%), high potassium (K2O = 4.00–5.14 wt%), high alkali (K2O + Na2O = 7.88–8.62 wt%), and low calcium contents (CaO = 1.72–2.17 wt%), with the aluminium saturation index (A/CNK) ranging from 0.98 to 1.09, suggesting that the Mugagangri monzogranite is a metaluminous to weak peraluminous I‐type high‐K calc‐alkaline granite. Geochemically, similar to the arc magmas, the monzogranite is enriched in large‐ion lithophile elements, and relatively depleted in high‐field‐strength elements. The monzogranite displays relatively high (87Sr/86Sr)i values (0.70972–0.71240), uniform εNd(t) values (−2.24 to −3.40), variable zircon εHf(t) values (−14.1 to +8.0), and high radiogenic Pb isotopic values (206Pb/204Pb = 18.588–18.790, 207Pb/204Pb = 15.616–15.642, and 208Pb/204Pb = 38.838–39.053). These geochemical characteristics indicate that the monzogranite was derived from a mixed source comprising ancient crustal and mantle materials, and experienced fractional crystallization during emplacement. We propose that the parental magma of the Mugagangri monzogranite was most likely generated during northward subduction of the Bangong Co‐Nujiang Meso‐Tethys Ocean.

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Late Jurassic Nb‐enriched basalts from the Bilong Co area in the southern Qiangtang Terrane, central Tibet, and their implications

Cheng

et al. 2021

Geological Journal

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Early Cretaceous bimodal volcanism in the Duolong Cu mining district, western Tibet: Record of slab breakoff that triggered ca. 108–113 Ma magmatism in the western Qiangtang terrane

Cited by 43 publications

References 89 publications

Tectonic Control, Reconstruction and Preservation of the Tiegelongnan Porphyry and Epithermal Overprinting Cu (Au) Deposit, Central Tibet, China

Tectonic Control, Reconstruction and Preservation of the Tiegelongnan Porphyry and Epithermal Overprinting Cu (Au) Deposit, Central Tibet, China

Zircon U–Pb ages, geochemistry, and Sr–Nd–Pb–Hf isotopes of the Mugagangri monzogranite in the southern Qiangtang of Tibet, western China: Implications for the evolution of the Bangong Co‐Nujiang Meso‐Tethyan Ocean

Late Jurassic Nb‐enriched basalts from the Bilong Co area in the southern Qiangtang Terrane, central Tibet, and their implications

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