Late Cretaceous high-Mg# granitoids in southern Tibet: Implications for the early crustal thickening and tectonic evolution of the Tibetan Plateau?

Chen, Jianlin; Xu, Ji‐Feng; Yu, Hua-Zhong; Wang, Baodi; Wu, Jianbin; Feng, Yuexing

doi:10.1016/j.lithos.2015.06.020

Cited by 54 publications

(45 citation statements)

References 72 publications

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“…Pullen et al () investigated the Gangdese retro arc thrust belt and foreland basin deposits in the Damxung area, Southern Tibet, and proposed significant crustal thickening and elevation gain in Southern Tibet prior to India–Asia collision. Moreover, abundant ~90 Ma adakitic rocks have been identified in Central Lhasa (J. L. Chen, Xu, et al, , G.Y. Sun, Hu, Zhu, et al, ; Figure a).…”

Section: Discussionmentioning

confidence: 99%

“…The remarkable Mg‐rich nature of the ~90 Ma adakitic rocks (Figure d–f) might suggest that they were produced from lithospheric delamination (Chung et al, ; J. L. Chen, Xu, et al, ; F. Huang, Li, Dong, He, & Chen, ; Xu, Zhang, et al, ). The delamination of lithospheric mantle would generate extensive basaltic extrusive rocks and silicic intrusions (Bird, ).…”

Section: Discussionmentioning

confidence: 99%

“…The Cu–Au mineralization developed at ~90–80 Ma in Central Lhasa was related to the emplacement of granite porphyry intrusions. At this time, abundant juvenile magmas were emplaced following the delamination of the thickened lower crust (L. Chen, Qin, et al, ; J. L. Chen, Xu, et al, ; G. Y. Sun, Hu, Zhu, et al, ), whose depleted Sr–Nd–Hf isotopic compositions are shown in Figure g–i.…”

Section: Discussionmentioning

confidence: 99%

“…Mesozoic magmatic rocks are extensively exposed in Central Lhasa and range in composition from mafic to felsic (M. J. Cao et al, ; J. L. Chen, Xu, et al, ; S. S. Chen, Shi, et al, ; Figure c). These rocks mainly formed during the Early Cretaceous, marked by a flare‐up of activity at ~113 Ma (Z. Q. Hou, Duan, et al, ; Zhu et al, ).…”

Section: Geological Backgroundmentioning

confidence: 99%

“…Ages are compiled from Chu et al (), Qu, Xin, Xu, Yang, and Li (), Kang, Xu, Dong, and Wang (), C.Y. Zhou et al (), H. Zhou, Qiu, Yu, and Wang (), Zhu, Mo, Niu, et al (), Zhu, Mo, Wang, et al (), Zhu et al (), Y. M. Gao et al (), J. H. Gao, Zeng, Gao, Hou, and Guo (), X. Jiang et al (), W. Liu, Li, Yuan, Zhang, et al (), W. Liu, Li, Yuan, Zhou, et al (), W. Liu, Li, Yang, and Yuan (), F. Y. Meng et al (), F. Y. Meng et al (), F. Q. Li et al (), Y. X. Li et al (), X. Y. Li et al (), Y. Li et al (), G. C. Fei, Wen, Wang, Wu, et al (), G. C. Fei, Wen, Wang, Zhou, et al (), F. Fei et al (), Du, Qu, Wang, Xin, and Liu (), H. X. Yu, Chen, et al (), Y. S. Yu, Gao, et al (), Cui et al (), B. D. Wang, Guo, et al (), B. D. Wang et al (), Wang, Zheng, et al (), L. Q. Wang, Tang, et al (), L. Q. Wang, Xie, and Wang (), L. Y. Wang, Zheng, Gao, et al (), L. Y. Wang, Zheng, Yang, et al (), L. Q. Wang et al (), Yao et al (), X. Q. Zhang, Zhu, et al, , L. L. Zhang et al (), X. Q. Zhang, Zhu, et al (), Y. J. Zhang, Liu, Zhu, An, and Liao (), Z. Zhang, Chen, et al (), Z. Zhang, Yao, et al (), K. X. Huang et al (), Y. Chen et al (), J. L. Chen, Xu, et al (), S. S. Chen, Fan, et al (), S. S. Chen, Shi, et al (), Z. Q. Hou, Duan, et al (), G. Y. Sun, Hu, Sinclair, et al (), G. Y.…”

Section: Introductionmentioning

confidence: 99%

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Petrogenesis and metallogenic implications of Cretaceous magmatism in Central Lhasa, Tibetan Plateau: A case study from the Lunggar Fe skarn deposit and perspective review

et al. 2018

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The Lhasa terrane is one of the major segments of the Tibetan Plateau, with widespread Mesozoic to Cenozoic magmatic and metallogenic records. Here, we investigate timing and characteristics of magmatism associated with the Lunggar Fe skarn deposit in Central Lhasa. We also present Sr–Nd–Pb and Hf (zircon) isotopic data on three associated intrusions to gain insights on the tectonic and metallogenic evolution of the region. Our data reveal at least two magmatic pulses in Lunggar represented by Early Cretaceous I‐type granodiorite (112.9 ± 1.5 Ma) and granite porphyry (112.6 ± 1.3 Ma) with magma generation related to slab break‐off associated with the Bangong–Nujiang Ocean during closure of the Meso‐Tethyan ocean at ~113 Ma. Iron skarn mineralization at Lunggar was contemporaneous with local Early Cretaceous intrusive activity. Following this, Late Cretaceous adakitic diorite (90.5 ± 1.5 Ma) formed from delaminated thickened crust at ~91 Ma related to the northern subduction of the Yarlung‐Zangbo oceanic plate. We also provide a comprehensive review of the Cretaceous tectonic evolution of Central Lhasa, which trace the tectonic evolution as follows: (a) 145–120 Ma: southward subduction of the Bangong–Nujiang oceanic plate under the Lhasa terrane; (b) 120–115 Ma: Lhasa‐Qiangtang continental collision; (c) 115–110 Ma: slab break‐off of the Bangong–Nujiang Ocean; (d) 110–95 Ma: crustal thickening of the Central Lhasa lower crust; (e) 95–80 Ma: delamination of lithospheric mantle; and (f) 80–65 Ma: northward subduction of the Yarlung‐Zangbo oceanic plate and subsequent slab rollback. The related metallogenic events in Central Lhasa include (a) ~115–110 Ma skarn Fe mineralization associated with slab break‐off; (b) ~90–80 Ma porphyry Cu–Au mineralization formed in delaminated thickened crust of Central Lhasa; and (c) ~65 Ma skarn Pb–Zn mineralization produced from slab rollback of the Yarlung‐Zangbo Ocean.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Geological Backgroundmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Petrogenesis and metallogenic implications of Cretaceous magmatism in Central Lhasa, Tibetan Plateau: A case study from the Lunggar Fe skarn deposit and perspective review

et al. 2018

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Removal of deep lithosphere in ancient continental collisional orogens: A case study from central Tibet, China

Chen

Shi

et al. 2017

Geochem Geophys Geosyst

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Widespread but small‐volume Late Cretaceous volcanic rocks in central Tibet contain important information on the Lhasa‐Qiangtang collision process. In this contribution, we focus on Late Cretaceous volcanics in the southern Qiangtang subterrane and present zircon LA‐ICP‐MS U‐Pb ages, whole‐rock major and trace element compositions, and Sr‐Nd isotopic data. Zircon LA‐ICP‐MS U‐Pb dating yielded a concordant age of 80 Ma, which postdates the Early Cretaceous collision of the Qiangtang and Lhasa terranes. The volcanic rocks are potassium‐rich alkaline andesites with high contents of K2O (3.45–5.11 wt %) and Th (13.39–25.02 ppm), as well as high K2O/Na2O ratios (0.6–0.9). They have higher REE and HFSE contents than coeval Mg‐rich and adakite‐like magmatic rocks that can be related to partial melting of a thickened lower crust. Moreover, they have higher values of Mg# and lower contents of SiO2 than lower continental crust‐derived rocks in central Tibet and experimental data of mafic rocks. We argue that the andesites were generated after the removal of thickened lithospheric mantle and subsequent to the final Lhasa‐Qiangtang amalgamation in a postcollisional setting. The high‐K characteristics can be explained by producing the primitive andesite magmas from partial melting of the residual and shallow metasomatized lithospheric mantle (the K‐rich layer) during heating by upwelling asthenosphere; subsequently, these primitive andesite magmas were subjected to fractional crystallization to generate the Amdo andesites. The way in which these andesites were formed provides evidence for the lithospheric thickening and uplifting of central Tibet during the Late Cretaceous prior to India‐Asia collision.

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Formation of Late Cretaceoushigh‐Mggranitoid porphyry in central Lhasa, Tibet: Implications for crustal thickening prior to India–Asia collision

Dai

Huang

et al. 2020

Geological Journal

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The Tibetan Plateau is characterized by the largest crustal thickness on Earth, although the timing of formation of the plateau remains debated. In this study, we present in situ laser ablation-inductively coupled plasma-mass spectrometry zircon U-Pb ages and Hf isotopes, and whole-rock geochemical data on porphyritic granitoids of Sebuta in the central Lhasa block. Our zircon U-Pb data indicate that these rocks emplaced at ca. 89 Ma, in the early Late Cretaceous. Geochemically, the Sebuta biotite granite porphyry can be broadly divided into two subtypes, namely metaluminous porphyry and peraluminous porphyry. The metaluminous porphyry has high SiO 2 , Al 2 O 3 , Sr, low Y and Yb contents, and high Sr/Y and La N /Yb N ratios, showing adakitic features. These rocks have high K 2 O and Th contents, low Ti/Eu and Nd/Sm ratios, indicative of a continental crust affinity. Positive zircon ε Hf (t) values, along with high Mg # , Cr and Ni, imply that the Sebuta adakitic porphyry was most likely derived from partial melting of a delaminated thickened juvenile lower crust, and that the initial melts interacted with mantle peridotite during ascent. The field features, petrographic characteristics, formation age, ore-bearing potential, and Hf isotope of the peraluminous porphyry are similar to those of the Sebuta adakitic porphyry, indicating that the peraluminous porphyry was likely formed by contamination with ancient crustal material and fractional crystallization from the same primary adakitic magmas which generated the Sebuta adakitic porphyry. Residual phases of amphibole + plagioclase + garnet + rutile in the source region, together with previous studies, suggest that the crust beneath the centralnorthern Lhasa block experienced thickening during the early Late Cretaceous, and had already been thickened to more than 50 km by the Late Cretaceous (ca. 89 Ma).

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Late Cretaceous high-Mg# granitoids in southern Tibet: Implications for the early crustal thickening and tectonic evolution of the Tibetan Plateau?

Cited by 54 publications

References 72 publications

Petrogenesis and metallogenic implications of Cretaceous magmatism in Central Lhasa, Tibetan Plateau: A case study from the Lunggar Fe skarn deposit and perspective review

Petrogenesis and metallogenic implications of Cretaceous magmatism in Central Lhasa, Tibetan Plateau: A case study from the Lunggar Fe skarn deposit and perspective review

Removal of deep lithosphere in ancient continental collisional orogens: A case study from central Tibet, China

Formation of Late Cretaceoushigh‐Mggranitoid porphyry in central Lhasa, Tibet: Implications for crustal thickening prior to India–Asia collision

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