Petrogenesis of Paleocene-Eocene porphyry deposit-related granitic rocks in the Yaguila-Sharang ore district, central Lhasa terrane, Tibet

Zhao, Jun‐Hong; Li, Guangming; Evans, Noreen J.; Qin, Kezhang; Li, Jinxiang; Zhang, Xianan

doi:10.1016/j.jseaes.2016.08.004

Cited by 27 publications

(6 citation statements)

References 82 publications

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“…Sun, Hu, Sinclair, et al (), G. Y. Sun, Hu, Zhu, et al (), S. F. Fan, Qu, Song, and Xin (), T. S. Yang et al (), Zhao et al (), Zhao et al (), M. J. Cao et al () [Colour figure can be viewed at wileyonlinelibrary.com]…”

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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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: 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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“…Chemically, the Group II rocks were typical of alkaline series REE patterns. The chemical composition of representative Group II rocks were comparable to the Miocene basaltic dike from Miocene magmatism in Tibet 23 , which had been formed postcollision between India and the Eurasia plates in the northern Himalayan orogeny and cross cut into granitic rocks (Fig. 8).…”

Section: Modern Analoguementioning

confidence: 79%

“…The REE patterns for the cumulus gabbro had positive Eu Fig. 8 Chondrite-normalized REE patterns 20 and N-MORB normalized multielement patterns 21 for the studied rocks and their modern analogue (solid triangle); Group I 22 , Group II 23 , Group III 23 , and Group IV 24 . anomalies, and were controlled by cumulative plagioclases. The chemical compositions of representative Group IV rocks were most comparable with Cretaceous basalt from the Karoo volcanic rocks, Mozambique 24 , which had been formed withinplate in south-eastern Africa (Fig.…”

Section: Modern Analoguementioning

confidence: 99%

Petrochemical characteristics of Tak volcanic rocks, Thailand: Implication for tectonic significance

Phajuy¹,

Singtuen²

2019

ScienceAsia

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Tak volcanic rocks, found in the southern part of the Chiang Khong-Lampang-Tak volcanic belt in northern Thailand, provide important evidence of the tectonic evolution of the Palaeotethys ocean. Petrographically and geochemically, the volcanic rocks selected for this study are made up of rhyolite, rhyodacite, andesite porphyry, and basalt. Based on field investigations, these rocks are also associated with other igneous rocks including granite, granodiorite, tuff, gabbro, and cumulus gabbro. The chemical data acquired from X-ray fluorescence, inductively coupled plasma atomic emission spectroscopy, and inductively coupled plasma mass spectrometry methods suggest that the studied rocks from the eruption can be separated into eight magmatic groups and four tectonic settings. The tectonic setting of the southern location of Chiang Khong-Lampang-Tak volcanic rocks consists of (1) an active continental margin (Groups V and VII), (2) a back-arc basin (Group VI), (3) post-collision (Groups II and III), and (4) continental rifting (Groups I, IV, and VIII).

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“…Zircon ε Hf ( t ) versus U–Pb age (Ma) for the intermediate‐acid igneous rocks in the central Lhasa block. The Balazha granitoid is from Chen, Xu, et al (2015) and Yu et al (2011); Cretaceous intermediate‐acid igneous rocks in the central Lhasa block are from Yu et al (2011), Wang, Guo, Wang, et al (2012); Wang, Zheng, Gao, et al (2016); Wang et al (2019), Meng, Zhao, Zhu, et al (2014), Hou et al (2015), Zhao, Li, Evans, et al (2016) and Cao, Zhang, Santosh, et al (2019). CHUR, chondritic uniform reservoir; DM, depleted mantle [Colour figure can be viewed at wileyonlinelibrary.com]…”

Section: Discussionmentioning

confidence: 99%

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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Petrogenesis of Paleocene-Eocene porphyry deposit-related granitic rocks in the Yaguila-Sharang ore district, central Lhasa terrane, Tibet

Cited by 27 publications

References 82 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

Petrochemical characteristics of Tak volcanic rocks, Thailand: Implication for tectonic significance

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

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