Petrogenesis of Jurassic granitoids in the west central Lhasa subterrane, Tibet, China: the Geji example

Yong, Wang; Tang, Juxing; Wang, Liqiang; Duan, Jilin; Danzhen, Wangxiu; Shen, Li; Li, Zhuang

doi:10.1080/00206814.2017.1375438

Cited by 13 publications

(7 citation statements)

References 83 publications

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“…All spots are distributed closely along the concordance diagrams and reliable, and thus the age of 152±3 Ma represents the crystallization age of the peridotite. In the northern margin of the Lhasa terrane and Geji region, the Jurassic arc-related magmatism and volcanic rocks have also been reported along the Shiquan river ophiolite belt (Zheng Youye et al, 2006;Wang et al, 2017).…”

Section: Resultssupporting

confidence: 65%

Discovery of Ophiolitic Mélange in the North Region of Geji County, Northwest Tibet and Its Zircon U‐Pb Age

Song

Peng

et al. 2018

Acta Geologica Sinica (Eng)

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Section: Resultssupporting

confidence: 65%

Discovery of Ophiolitic Mélange in the North Region of Geji County, Northwest Tibet and Its Zircon U‐Pb Age

Song

Peng

et al. 2018

Acta Geologica Sinica (Eng)

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“…The Pb isotope analyses were performed by multicollector (MC)-ICP-MS, using Pb isotope standard NBS981 to correct data. The detailed analytical procedures are consistent with those described by Wang et al (2018).…”

Section: Sampling and Analytical Methodsmentioning

confidence: 78%

“…Several genetic models have been proposed to account for the origin of Miocene adakite‐like porphyries in Eastern Gangdese belt: (i) partial melting of the thickened subduction‐modified Tibetan lower crust (Chung et al, ; Guo et al, ; Hou et al, ); (ii) partial melting of the upper mantle source metasomatized by the slab‐derived melts (Gao et al, , ); (iii) melting of subducted oceanic crust (Qu et al, , ); (iv) high‐pressure differentiation of hydrous mafic partial melts from Tibetan mantle (Lu et al, ); (v) partial melting of mafic Indian lower crust (Xu et al, ); and (vi) magma mixing origin (Sun et al, ; Wang et al, ; Yang et al, , ). As discussed below, we favour the last model for the genesis of Miocene biotite monzogranite porphyry at Demingding.…”

Section: Discussionmentioning

confidence: 99%

“…Although large amounts of researches have been conducted on the Miocene adakite-like porphyries in the Gangdese belt, the origin of the Miocene adakite-like porphyries remains debated. Several genetic models have been proposed to account for the origin of Miocene adakite-like porphyries: (i) partial melting of the thickened subduction-modified Tibetan lower crust (Chung et al, 2003;Guo, Wilson, & Liu, 2007;Hou et al, 2004), (ii) partial melting of the upper mantle source metasomatized by the slab-derived melts (Gao et al, 2007(Gao et al, , 2010, (iii) melting of subducted oceanic crust (Qu, Hou, & Li, 2004;Qu, Hou, Zaw, & Li, 2007), (iv) high-pressure differentiation of hydrous mafic partial melts from Tibetan mantle (Lu, Loucks, Fiorentini, Yang, & Hou, 2015), (v) partial melting of mafic Indian lower crust (Xu, Zhang, Guo, & Yuan, 2010), and (vi) magma mixing origin (Sun et al, 2018;Wang et al, 2018;Yang, Goldfarb, & Chang, 2016;Yang, Lu, Hou, & Chang, 2015).…”

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confidence: 99%

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Geochemistry and zircon trace elements composition of the Miocene ore‐bearing biotite monzogranite porphyry in the Demingding porphyry Cu‐Mo deposit, Tibet: Petrogenesis and implication for magma fertility

et al. 2019

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MS zircon U-Pb dating, whole-rock geochemistry, and zircon trace elemental data for the mineralization related biotite monzogranite porphyry in Demingding. Zircon U-Pb dating shows that the weighted mean 206 Pb/ 238 U ages of the Miocene biotite monzogranite porphyry is 20.36 ± 0.46 Ma (MSWD = 2.6, n = 21). The Miocene biotite monzogranite porphyry is characterized by high SiO 2 , K 2 O, and Al 2 O 3 contents and shows adakite-like signatures. These rocks have high Sr/Y ratios, fractionated REE patterns with low HREE abundances, enrichment in LILE compared with HFSE, and have ( 87 Sr/ 86 Sr) i values of 0.7059 to 0.7062, ε Nd (t) values of −2.35 to −1.67 and (-206 Pb/ 204 Pb) i ratios of 18.50-18.55. These features are similar to other Miocene adakite-like intrusions in the Gangdese belt. We propose that the biotite monzogranite porphyry shares the same petrogenesis with other Miocene ore-bearing adakite-like intrusions in the Eastern Gangdese belt and was derived from remelting of the subduction-modified, eclogitized Tibetan lower crust and mixing with hydrous mafic magmas from metasomatized Tibetan mantle. The zircons from biotite monzogranite porphyry have only minimal negative Eu anomalies (Eu N /Eu N * > 0.3), and exhibit large ratios of Ce 4+ /Ce 3+ (average value of 113), 10,000*(Eu N /Eu N *)/Y (3.94-8.14, >1), Ce/Nd (9-58, Average value of 30), (Ce/Nd)/Y (0.008-0.127, >0.003), and low value of Dy/Yb (0.15-0.24, <0.3), indicating that the biotite monzogranite porphyry is relatively hydrous and oxidized. The biotite monzogranite porphyry, therefore, is believed to be a relatively fertile intrusion with certain exploration potential.

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“…Sr/ 86 Sr = 0.710260 ± 0.000010 (2σ, n = 30). The total analytical blanks were 5 × 10 −11 g for Sm and Nd and (2-5) × 10 −10 g for Rb and Sr (Wang et al, 2017b spots. The analytical instrument conditions and data acquisition methods followed the procedures described by (Wu, Yang, Xie, Yang, & Xu, 2006).…”

Section: Sample Descriptions and Analytical Methodsmentioning

confidence: 99%

Petrogenesis and geodynamic implications of the intrusions related to the Pusangguo skarn Cu‐dominated polymetallic deposit in Tibet: Constraints from geochronology, geochemistry, and Sr–Nd–Pb–Hf isotopes

Lang

Zhang³

et al. 2020

Geological Journal

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Pusangguo is a high‐grade skarn‐type Cu‐dominated polymetallic deposit and the only large‐sized Cu‐Pb‐Zn‐(Co‐Ni) deposit in the Gangdese metallogenic belt (GMB); the magmatic rocks associated with this deposit are poorly documented, and their petrogenesis and geodynamic setting are unclear. To explore these issues, we present zircon U–Pb ages along with Hf isotopic, whole‐rock geochemical, and Sr–Nd–Pb isotopic data for Pusangguo biotite granodiorite (PBG) and Pusangguo diorite porphyrite (PDP) in this deposit. Zircon U–Pb dating for these rocks indicates that they were emplaced during the Miocene (13.6–14.6 Ma). Geochemically, both PBG and PDP show characteristics of adakites, with intermediate SiO2 (65.55–67.30 wt% and 60.56–58.27 wt%, respectively), relatively high Al2O3 (15.28–15.85 wt% and 17.71–16.71 wt%, respectively) and Sr (599–723 ppm and 687–1,616 ppm, respectively) and low Y and Yb. In addition, they show relatively low ratios of (87Sr/86Sr)i and (206Pb/204Pb)i, (207Pb/204Pb)i and (208Pb/204Pb)i and relatively low values of εNd(t) and εHf(t). The Sr‐Nd‐Pb‐Hf isotopes of PBG and PDP are similar to those of the Miocene adakitic rocks associated with the porphyry–skarn deposits in the GMB, indicating that they were predominantly generated by partial melting of the thickened juvenile Lhasa Terrane lower crust and the PDP were likely to be generated through mixing between the magma parental to the PBG and a mafic end‐member. By combining our results with the previously reported results, we suggest that the model of delamination of the overthickened mantle lithosphere of Lhasa Terrane and convective upwelling of mantle asthenosphere which may involve Indian continental lithosphere.

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Petrogenesis of Jurassic granitoids in the west central Lhasa subterrane, Tibet, China: the Geji example

Cited by 13 publications

References 83 publications

Discovery of Ophiolitic Mélange in the North Region of Geji County, Northwest Tibet and Its Zircon U‐Pb Age

Discovery of Ophiolitic Mélange in the North Region of Geji County, Northwest Tibet and Its Zircon U‐Pb Age

Geochemistry and zircon trace elements composition of the Miocene ore‐bearing biotite monzogranite porphyry in the Demingding porphyry Cu‐Mo deposit, Tibet: Petrogenesis and implication for magma fertility

Petrogenesis and geodynamic implications of the intrusions related to the Pusangguo skarn Cu‐dominated polymetallic deposit in Tibet: Constraints from geochronology, geochemistry, and Sr–Nd–Pb–Hf isotopes

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