Geochronology, geochemistry, Sr–Nd–Hf isotopic compositions, and petrogenetic and tectonic implications of Early Cretaceous intrusions associated with the Duolong porphyry–epithermal Cu–Au deposit, central Tibet

Wei, Shaogang; Song, Youjian; Tang, Juxing; Liu, Zhibo; Wang, Qin; Lin, Bin; Feng, Jufu; Hou, Lin; Danzhen, Wangxiu

doi:10.1080/00206814.2017.1369178

Cited by 14 publications

(13 citation statements)

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“…2015; Wei et al . 2018). Note that the interval between the RCA and Duolong area measures only approximately 65 kilometres spatially, forming a nearly W-S magmatic belt parallel to the BNSZ (Fig.…”

Section: Discussionmentioning

confidence: 99%

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Petrogenesis of Early Cretaceous volcanic rocks from the Rena-Co area in the southern Qiangtang Terrane, central Tibet: evidence from zircon U-Pb geochronology, petrochemistry and Sr-Nd-Pb–Hf isotope characteristics

et al. 2023

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The subduction of the Bangong–Nujiang Ocean is important in the geological evolution of the Tibetan Plateau. In this paper, we report new zircon U-Pb age and Lu-Hf isotopic data and whole-rock elemental and Sr-Nd-Pb isotopic data for Early Cretaceous dacites from the Rena-Co area (RCA) in the southern Qiangtang Terrane (QT), central Tibet and use these data to better understand the tectonic evolution of the Bangong–Nujiang suture. LA–ICP-MS dating of zircons yields ages of 109.5 ± 0.6 Ma to 109.6 ± 0.8 Ma for the dacites from the RCA. Geochemically, these dacites are medium-K calc-alkaline and show high SiO2 contents of 64.79–70.37 wt.%, high Sr contents of 517–598 ppm and low Y contents of 8.45–10.7 ppm, similar to those of typical adakites. Additionally, all the rocks are strongly enriched in light rare earth elements and some large ion lithophile elements (e.g. Rb, U, K and Cs) but significantly depleted in high-field-strength elements (e.g. Nb, Ta and Ti), consistent with the geochemical characteristics of arc-type magmas formed in the subduction zone. Moreover, these adakite-like dacites show whole-rock initial (87Sr/86Sr)i ratios of 0.705119 to 0.705491, (206Pb/204Pb)i ratios of 18.489 to 18.508, (207Pb/204Pb)i ratios of 15.591 to 15.612, (208Pb/204Pb)i ratios of 38.599 to 38.686, ϵ Nd (t) values of −0.28 to +1.25 and single-stage Nd model ages of 642 to 818 Ma, as well as significantly positive zircon ϵHf(t) values of 3.9–13.1, with young Hf-depleted mantle ages of 331 to 923 Ma. These geochemical and isotopic data indicate that they are most likely derived from the juvenile thickened mafic lower continental crust, which contains partial melts of metasomatized peridotite and subduction-related fluids in the magma source region. Based on previous studies and our new data, we propose that the RCA adakite-like dacites are most likely a result of the northwards subduction of the Bangong–Nujiang Ocean lithosphere beneath the southern QT during the Early Cretaceous and that a slab rollback model could explain the formation of the RCA adakite-like dacites.

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Section: Discussionmentioning

confidence: 99%

“…2013 a , 2016; Sun 2015; Zhu et al 2015; Wei et al . 2017, 2018). Notably, these volcanic rocks from the RCA show lower zircon ϵ Hf (t) values than depleted mantle (Fig.…”

Section: Discussionmentioning

confidence: 99%

Petrogenesis of Early Cretaceous volcanic rocks from the Rena-Co area in the southern Qiangtang Terrane, central Tibet: evidence from zircon U-Pb geochronology, petrochemistry and Sr-Nd-Pb–Hf isotope characteristics

et al. 2023

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“…Fan, Li, Wang, et al (2018) suggested that the distribution of the Shamuluo and Dongqiao Formations is limited to the northern margin of the Bangong‐Nujiang suture zone, indicating that it does not represent the final closure of the Bangong‐Nujiang Tethyan Ocean and probably represents arc‐arc and arc‐continent collisions along the northern margin of the Bangong‐Nujiang Tethyan Ocean during the Late Jurassic–Early Cretaceous. However, based on the timing of the cessation of magmatism (140–130 Ma), most scholars believe that they are the products of the northern flat subduction of the Bangong‐Nujiang Tethyan Ocean (Hao et al, 2018; Li et al, 2018; Wei et al, 2017). Yin and Harrison (2000) also concluded that the early Cretaceous Amdo granite was produced in a collisional environment; however, they believe that it only represents the Late Jurassic closure of the eastern segment of the Bangong‐Nujiang Tethyan Ocean near Amdo (long.…”

Section: Discussionmentioning

confidence: 99%

“…In addition, Fan, Li, and Xie (2014) conducted a detailed petrological, geochemical, and chronological study of Zhonggang ocean island in the Gerze area and obtained a U‐Pb zircon age of 116.2 ± 4.1 Ma, which suggests that the Bangong‐Nujiang Tethyan Ocean still existed in Aptian time. Recently, studies of Early Cretaceous magmatism on both sides of the Bangong‐Nujiang suture zone have shown that these magmatic events were controlled by the subduction of the Bangong‐Nujiang Tethyan Ocean (Cao et al, 2016; Fan et al, 2015a; Hao et al, 2016b; J. X. Li et al, 2013, 2014; Liu et al, 2020; Wang et al, 2020; Wei et al, 2017; Wu et al, 2015; Xu et al, 2017). Moreover, Xu et al (2014) and Zeng et al (2018) identified ca.…”

Section: Discussionmentioning

confidence: 99%

“…Recently, studies of Early Cretaceous magmatism on both sides of the Bangong-Nujiang suture zone have shown that these magmatic events were controlled by the subduction of the Bangong-Nujiang Tethyan Ocean (Cao et al, 2016;Fan et al, 2015a;Hao et al, 2016b;J. X. Li et al, 2013Liu et al, 2020;Wang et al, 2020;Wei et al, 2017;Wu et al, 2015;Xu et al, 2017). Moreover, Xu et al (2014) and Zeng et al (2018) identified ca.…”

Section: Early Cretaceous Evolution Of the Bangong-nujiang Tethyan Oceanmentioning

confidence: 99%

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Aptian Flysch in Central Tibet: Constraints on the Timing of Closure of the Bangong‐Nujiang Tethyan Ocean

et al. 2020

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The timing of the closure of the Bangong-Nujiang Tethyan Ocean is highly controversial. An important reason for this is that the sedimentological work within the Bangong-Nujiang suture zone is not sufficient. In this study, based on the U-Pb zircon dating of turbiditic sandstone and tuff interlayers, we determine the existence of Aptian flysch (ca. 126-113 Ma) in the middle and western segments of the Bangong-Nujiang suture zone. Further analysis shows that the Aptian flysch was deposited in a trench environment. In space, from the Mabujia Co area in the western segment to the Kama area in the middle segment, the outcrop extent of the Aptian flysch spans nearly 300 km from east to west. These results indicate that the Bangong-Nujiang Tethyan Ocean had not fully closed by the end of Aptian time, and its oceanic slab was still subducting. Based on this new discovery, and the results of previous studies, we believe that the middle and western segments of the Bangong-Nujiang Tethyan Ocean closed between 113 and ca. 92 Ma nonmarine deposition of the Jingzhushan Formation, which lies in angular unconformity above the flysch.

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Early Cretaceous diorites in the Kenbale Cu mineralization occurrence, Tibet, China, and its geological significance

et al. 2018

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Geochronology, geochemistry, Sr–Nd–Hf isotopic compositions, and petrogenetic and tectonic implications of Early Cretaceous intrusions associated with the Duolong porphyry–epithermal Cu–Au deposit, central Tibet

Cited by 14 publications

References 96 publications

Petrogenesis of Early Cretaceous volcanic rocks from the Rena-Co area in the southern Qiangtang Terrane, central Tibet: evidence from zircon U-Pb geochronology, petrochemistry and Sr-Nd-Pb–Hf isotope characteristics

Petrogenesis of Early Cretaceous volcanic rocks from the Rena-Co area in the southern Qiangtang Terrane, central Tibet: evidence from zircon U-Pb geochronology, petrochemistry and Sr-Nd-Pb–Hf isotope characteristics

Aptian Flysch in Central Tibet: Constraints on the Timing of Closure of the Bangong‐Nujiang Tethyan Ocean

Early Cretaceous diorites in the Kenbale Cu mineralization occurrence, Tibet, China, and its geological significance

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