The newly-discovered Late Cretaceous igneous rocks in the Nuocang district: Products of ancient crust melting trigged by Neo–Tethyan slab rollback in the western Gangdese

Jiang, Junsheng; Zheng, Youye; Gao, Shiqiang; Huang, Junhua; Liu, Jun; Wu, Song; Xu, Jing; Huang, Liangliang

doi:10.1016/j.lithos.2018.03.009

Cited by 27 publications

(26 citation statements)

References 73 publications

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“…The Pb–Zn mineralization in the central Lhasa terrane is mainly associated with felsic intrusions (Duan et al, ; Fu et al, ; Gao et al, ; Hou et al, ; Jiang et al, ; Wang, Zhou, et al, ; Zheng, Sun, et al, ; Zhou et al, ). However, the genetic types of the felsic intrusions are still debated, Fu et al () proposed that they are S‐type granites, while Zhou et al () argued that they are I‐type granites (Figure ).…”

Section: Discussionmentioning

confidence: 99%

“…Late Cretaceous–Palaeocene magmatism in the Lhasa terrane was produced by rollback (~69–58 Ma) of the Neo‐Tethyan oceanic slab below the Indian Plate (Chung et al, ; Ding et al, ; Fu et al, ; Gao et al, ; Ji et al, ; Jiang et al, ; Wang, Tang, et al, ; Wen, Chung, et al, ). Slab rollback triggered asthenospheric upwelling and induced crustal melting (Fu et al, ; Hou & Cook, ; Jiang et al, ; Zheng, Sun, et al, ). Nearly all the felsic intrusions related to Pb–Zn–(Ag) deposits in the Lhasa terrane were derived mainly from partial melting of ancient crustal materials (Fei et al, ; Fu et al, ; Hou et al, ; Zheng, Sun, et al, ).…”

Section: Discussionmentioning

confidence: 99%

“…The arc magmatism lasted to ~80 Ma and had a gap or quiescent period between ~80 and 69 Ma (Wen, ). Then the rollback of the subducted Neo‐Tethys slab occurring at ~69–58 Ma (Chung et al, ; Ding et al, ; Fu et al, ; Ji et al, ; Jiang et al, ; Wang, Tang, et al, ; Wen, Chung, et al, ) and the following Eocene slab breakoff of Neotethys (Chung et al, ; Lee et al, , ; Ma, Xu, & Meert, ; Wang, Tang, et al, ; Wen, Liu, et al, ; Zhou et al, ; Zhu, Wang, Cawood, Zhao, & Mo, ) triggered the extensive Late Cretaceous–Eocene magmatism, characterized by extensive outcrops of the I‐type calc‐alkaline to high‐K calc‐alkaline Linzizong volcanic successions and coeval plutons (Dong, Mo, Zhao, Wang, & Zhou, ; Jiang et al, ; Liu et al, ; Ma et al, ; Mo et al, , ; Wang, Tang, et al, ; Wen, ; Zhu et al, ). The Linzizong volcanic successions are subdivided into lower Dianzhong, middle Nianbo, and upper Pana formations based on eruption hiatuses in the type locality “Linzhou basin” (Dong et al, ; Liu, ).…”

Section: Regional Geologymentioning

confidence: 99%

“…The Pb–Zn–(Ag) belt, one of the most important metallogenic belts in the Himalayan‐Tibetan continental orogenic system, is mainly located in the central Lhasa terrane (Fu et al, ; Hou et al, ; Hou & Cook, ; Zheng, Sun, et al, ). However, several Pb–Zn deposits such as Luobuzhen (Sun et al, ), Nuocang (Jiang et al, ), Dajiacuo, and Chazi (Gao, ) have recently been discovered in the middle segment of the southern Lhasa terrane (Figure b). Skarn is the major type of mineralization, with a small amount of breccia pipe, vein‐type, and manto deposits (Zheng, Sun, et al, ; Zhou et al, ).…”

Section: Regional Geologymentioning

confidence: 99%

“…The Pb-Zn mineralization in the central Lhasa terrane is mainly associated with felsic intrusions (Duan et al, 2014;Fu et al, 2017;Gao et al, 2017;Hou et al, 2015;Jiang et al, 2018;Wang, Zhou, et al, 2012;Zhou et al, 2017) 33 (Figure 7). These characteristics, together with the presence of CIPW-norm corundum (mostly >1%) in the samples (Table 4) and the observation of inherited cores in the zircon CL images ( Figure 5), indicate that the Beina rhyolite porphyry belongs to S-type Sun and McDonough (1989).…”

Section: Genetic Typementioning

confidence: 99%

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Zircon U–Pb dating, geochemistry, and Sr–Nd–Pb–Hf isotopes of the subvolcanic intrusion from Beina Pb–Zn–(Ag) deposit in the southern Lhasa terrane, Tibet: Implications for petrogenesis and mineralization

et al. 2018

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The Beina Pb–Zn–(Ag) deposit is a newly discovered deposit situated in the southern Lhasa terrane, Tibet. LA‐ICP‐MS U–Pb dating for the ore‐bearing rhyolite porphyry indicates that it was emplaced at 64.6 Ma. The Beina rhyolite porphyry displays high SiO2 (74.31–76.52 wt%), K2O + Na2O (6.99–8.05 wt%), and A/CNK (0.97–1.33), similar to the peraluminous S‐type granites related to Pb–Zn–(Ag) mineralization in the central Lhasa terrane. The Beina rhyolite porphyry is strongly depleted in Nb, Ta, Ti, P, Sr, and Ba, enriched in Rb, K, Th, U, and Pb, enriched in light rare earth elements (LREEs), slightly depleted in heavy rare earth elements (HREEs) (LaN/YbN = 6.52–9.28), and has moderate negative Eu anomalies (δEu = 0.38–0.48), showing an arc affinity. It also shows high CaO/Na2O ratios (0.21–0.73), low Rb/Ba (0.30–0.46), and Rb/Sr ratios (1.17–4.01), indicating that it was mainly derived from partial melting of a clay‐poor, plagioclase‐rich metapsammitic source. The samples have relatively high 87Sr/86Sr(i) (0.7084–0.7092) and Pb isotopes (206Pb/204Pb = 18.61–18.74, 207Pb/204Pb = 15.65–15.68, 208Pb/204Pb = 38.99–39.14) and low εNd(t) (−8.6 to −7.2) and εHf(t) (−8.6 to −4.8) values, yielding ancient two‐stage Nd model ages (1,459–1,569 Ma) and two‐stage Hf model ages (1,433–1,684 Ma), respectively. The Beina rhyolite porphyry was formed at relatively high temperatures (average 817°C) according to zircon saturation thermometer. These results reveal that Beina rhyolite porphyry was generated by partial melting of ancient crustal materials (dominated by metapsammite) heated by mantle‐derived magma during rollback of the Neo‐Tethyan oceanic slab. In addition, our research suggests that both I‐ and S‐type granites related to Pb–Zn mineralization are believed to exist in the Lhasa terrane. Similar to the central Lhasa terrane, the middle segment of the southern Lhasa terrane (83°E–87°E) is also an ancient block, large‐scaled silicic volcanic rocks of the Linzizong Group, and coeval plutons are widely exposed and several Pb–Zn deposits have recently been discovered in the Nuocang–Chazi area. All these facts indicate that there is a great potential for prospecting of intrusions‐related Pb–Zn deposits in the middle segment of the southern Lhasa terrane.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Regional Geologymentioning

confidence: 99%

Section: Regional Geologymentioning

confidence: 99%

Section: Genetic Typementioning

confidence: 99%

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Zircon U–Pb dating, geochemistry, and Sr–Nd–Pb–Hf isotopes of the subvolcanic intrusion from Beina Pb–Zn–(Ag) deposit in the southern Lhasa terrane, Tibet: Implications for petrogenesis and mineralization

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Sulphur and lead isotopic compositions of the Pb–Zn polymetallic deposits in the Linzizong volcanic area, Gangdese belt, Tibet: Implications for variation characteristics of ore‐forming material sources and exploration targeting

et al. 2019

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Relatively little attention has been given to variations in ore-forming metal sources of Pb-Zn polymetallic deposits hosted in or near the Linzizong volcanic rocks from the eastern to western Gangdese belt. Based on the S and Pb isotopic data of typical Pb-Zn polymetallic deposits from the eastern to western Gangdese, the oreforming sources are discerned. The δ 34 S V-CDT values of the typical Pb-Zn polymetallic deposits in the Gangdese metallogenic belt have a relatively large range of −11.6‰ to 6.0‰, different from those of the porphyry Cu ± Mo ± Au deposits (mainly vary from −2.0‰ to 1.0‰) in the Gangdese metallogenic belt, indicating that the sulphur in the ore-forming fluid of Pb-Zn polymetallic deposits was dominantly of magmatic origin, but also influenced by strata nearby. The Nuocang and Beina deposits in the western Gangdese have a predominantly upper crustal source of Pb (average values: 207 Pb/ 204 Pb = 15.705, 208 Pb/ 204 Pb = 39.102), while the Narusongduo and Dexin deposits in the central Gangdese and the Leqingla and Xingaguo deposits in the eastern Gangdese are characterized by a mixed source in which Pb was derived from both the subducted slab and the ancient Lhasa basement. From the eastern to western Gangdese, Pb isotopic data show a gradually increasing scale of crustal materials from the Lhasa terrane basement. Combined with the geochemical data of the ore-relatedintrusions and Linzizong volcanic rocks from the six deposits, or nearby, we proposed that the heterogeneity of Lhasa terrane crust resulted in more ancient Lhasa basement components contributing to ore-forming sources from the eastern to western Gangdese. Moreover, relatively higher contents of Au, Ag elements could be identified in the Linzizong volcanic rocks of the western Gangdese than those of in the central and eastern Gangdese. Therefore, in addition to finding the cryptoexplosive breccia, epithermal, skarn, hydrothermal vein-type Pb-Zn polymetallic deposits, there is exploration potential for epithermal Au-Ag deposits associated with the Linzizong volcanic rocks, western Gangdese. KEYWORDS lead isotope, Linzizong volcanic area, Pb-Zn polymetallic deposits, sulphur isotope, western Gangdese

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Petrogenesis and tectonic implications of Palaeocene (ca. 54 Ma) rhyolites in the western Lhasa Terrane, south Tibet: Constraints from geochemistry and Sr–Nd–Hf isotope compositions

Ding

Wang

et al. 2020

Geological Journal

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The widespread Linzizong volcanic successions (LVS) in the Lhasa Terrane was a magmatic response to the tectonic transition from Neo‐Tethyan oceanic subduction to the India–Asia collision, which has been the subject of many studies; however, studies on the LVS in the western Lhasa Terrane are scarce compared to those in the east, limiting our understanding of the tectonic transition. Zircon U–Pb ages of two rhyolitic samples from the Shiquanhe region in the west of the Lhasa Terrane indicate that at least part of the Zenong Group, previously thought to have formed during the Early Cretaceous, was actually erupted during the Late Palaeocene (ca. 54 Ma) and belongs to the LVS. The rhyolites are characterized by high SiO2 and Al2O3, moderate K2O and Na2O, and low MgO, CaO, and FeO contents, enrichment in Rb and Th, depletion in Sr, Ba, Eu, Nb, and Ta, and have relatively uniform whole‐rock εNd(t) (−1.90 to −0.89) and zircon εHf(t) (+0.95 to +5.03) values. These geochemical characteristics indicate that they were formed by the partial melting of juvenile continental crust with subsequent plagioclase, biotite, amphibole, and Fe–Ti oxide fractionation. Combined with the results of previous studies, our data show that the western Lhasa Terrane underwent intensive Early Cenozoic crustal growth, similar to what occurred in the east, due to underplating of mantle‐derived magma resulting from the roll‐back and eventual break‐off of the Neo‐Tethys slab after the initial continental collision.

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The newly-discovered Late Cretaceous igneous rocks in the Nuocang district: Products of ancient crust melting trigged by Neo–Tethyan slab rollback in the western Gangdese

Cited by 27 publications

References 73 publications

Zircon U–Pb dating, geochemistry, and Sr–Nd–Pb–Hf isotopes of the subvolcanic intrusion from Beina Pb–Zn–(Ag) deposit in the southern Lhasa terrane, Tibet: Implications for petrogenesis and mineralization

Zircon U–Pb dating, geochemistry, and Sr–Nd–Pb–Hf isotopes of the subvolcanic intrusion from Beina Pb–Zn–(Ag) deposit in the southern Lhasa terrane, Tibet: Implications for petrogenesis and mineralization

Sulphur and lead isotopic compositions of the Pb–Zn polymetallic deposits in the Linzizong volcanic area, Gangdese belt, Tibet: Implications for variation characteristics of ore‐forming material sources and exploration targeting

Petrogenesis and tectonic implications of Palaeocene (ca. 54 Ma) rhyolites in the western Lhasa Terrane, south Tibet: Constraints from geochemistry and Sr–Nd–Hf isotope compositions

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