A syn-collisional model for Early Cretaceous magmatism in the northern and central Lhasa subterranes

Chen, Shengsheng; Shi, Rui; Gong, Xinghong; Liu, Deliang; Huang, Quansheng; Yi, Guo-Ding; Wu, Kang; Zou, Haibo

doi:10.1016/j.gr.2015.04.008

Cited by 63 publications

(46 citation statements)

References 105 publications

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“…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: Geological Backgroundmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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“…8i) indicate that a major phase of the magmatic evolution occurred at a relatively shallow level. Plagioclase phenocrysts display obvious oscillatory zoning, which is suggestive of relatively slow ascent or retention within a shallow chamber (Chen et al, 2015). Quartz and calcite resorbed xenocrysts observed in rhyolites indicate contamination of magma by crustal material in this shallow magma chamber during the late stages of eruption.…”

Section: Magma Evolutionmentioning

confidence: 94%

“…Chen et al, 2015;Hu et al, 2017;Li et al, 2015;Liu et al, 2015Liu et al, , 2012Sui et al, 2013). The Qiangtang igneous rocks are high-K calc-alkaline in the south (Hao et al, 2016;Li et al, 2013Li et al, , 2015Liu et al, 2015) and shoshonitic in the north (Zhong et al, 2007), while those from northern Lhasa terrane are calcalkaline to High-K calc-alkaline (Chen et al, 2015;Hu et al, 2017;Sui et al, 2013). A coeval magmatic activity is also present in the Karakoram terrane, south of Pamir, which is represented by calc-alkaline to high-K-calc-alkaline Tashbulak formation -latite and quartz latite respectively proposed by Le Bas et al (1986) and codified by Le Maitre et al (1989).…”

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confidence: 99%

Pamir Plateau formation and crustal thickening before the India-Asia collision inferred from dating and petrology of the 110–92 Ma Southern Pamir volcanic sequence

et al. 2017

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The formation of the Pamir is a key component of the India-Asia collision with major implications for lithospheric processes, plateau formation, land-sea configurations and associated climate changes. Although the formation of the Pamir is traditionally linked to Cenozoic processes associated with the IndiaAsia collision, the contribution of the Mesozoic tectonic evolution remains poorly understood. The Pamir was formed by the suturing of Gondwanan terranes to the south margin of Eurasia, however, the timing and tectonic mechanisms associated with this Mesozoic accretion remains poorly constrained. These processes are recorded by several igneous belts within these terranes, which are not well studied. Within the Southern Pamir, the Albian-

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“…These suture zones separate the Songpan‐Ganze, Qiangtang, Lhasa, and Himalaya terranes, respectively [ Yin and Harrison , ]. The BNSZ, which extends east‐west across the middle part of the Tibetan Plateau, represents the site of an Early Cretaceous collision between the Qiangtang and Lhasa terranes [ Chen et al , ], which was preceded by northward or southward subduction of Meso‐Tethys oceanic lithosphere beneath central Tibet starting in the Middle Triassic [e.g., Zhu et al , ; Chen et al , , ]. The discontinuous ophiolites that crop out along the BNSZ may represent the remnants of Meso‐Tethys oceanic lithosphere [ Guynn et al , , ; Kapp et al , ; Shi et al , , ; Zhang et al , , ; X. R. Zhang et al , ; Chen et al , ].…”

Section: Geological Background and Samplingmentioning

confidence: 99%

Early Permian mafic dikes in the Nagqu area, central Tibet, China, associated with embryonic oceanic crust of the Meso‐Tethys Ocean

Chen

Shi

et al. 2017

JGR Solid Earth

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During the latest Carboniferous to Early Permian, a possible mantle plume initiated continental rifting along the northern Gondwana margin, which subsequently developed into the Meso‐Tethys Ocean. However, the nature and timing of the embryonic oceanic crust of the Meso‐Tethys Ocean remain poorly understood. Here we present for the first time a combined analysis of petrological, geochronological, geochemical, and Sr‐Nd isotopic data for mafic rocks from the Nagqu area, central Tibet. Zircons from the mafic rocks yield a concordant age of ~277.8 ± 1.8 Ma, which is slightly younger than the age of mantle plume activity (~300–279 Ma), as represented by the large igneous province (LIP) on the northern Gondwana margin. Geochemical features suggest that the Nagqu mafic rocks, which display normal mid‐ocean ridge basalt affinities, are different from those of the LIP, which display oceanic island basalt‐type affinities. The Nagqu mafic rocks result from a relatively high degree of melting of depleted asthenospheric mantle. Combined with observations from previous studies, we suggest that the late Early Permian Nagqu magmatism fully records processes of early stage rifting and incipient formation of oceanic crust. Moreover, the patterns of magmatism are consistent with patterns of rift‐related sedimentation that records the transition from predominantly continental to marine deposition in the region during the Carboniferous‐Permian. We therefore suggest that rifting of the eastern Cimmerian and northern Gondwana continents started at ~277.8 Ma, and the rifting culminated in the opening of the Meso‐Tethys Ocean.

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A syn-collisional model for Early Cretaceous magmatism in the northern and central Lhasa subterranes

Cited by 63 publications

References 105 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

Pamir Plateau formation and crustal thickening before the India-Asia collision inferred from dating and petrology of the 110–92 Ma Southern Pamir volcanic sequence

Early Permian mafic dikes in the Nagqu area, central Tibet, China, associated with embryonic oceanic crust of the Meso‐Tethys Ocean

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