Petrogenesis of Triassic granitoids in the East Kunlun Orogenic Belt, northern Tibetan Plateau and their tectonic implications

Shao, Fang; Niu, Yaoling; Liu, Yi; Chen, Shuo; Kong, Juanjuan; Duan, Meng

doi:10.1016/j.lithos.2017.03.002

Cited by 105 publications

(75 citation statements)

References 64 publications

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“…The regional angular unconformity between the Late Triassic terrestrial Babaoshan (Elashan) Formation and the underlying Early–Middle Triassic shallow marine Naocangjian Formation and the Xilikete Formation (Xia et al, ; Yan et al, ) indicates that the closure of the A'nyemaqen Ocean and continental collision occurred prior to the Late Triassic. Hence, the late Triassic large‐scale granitic magmatism in the EKO generally is associated with syn‐collision or postcollisional processes (Hu et al, ; Shao et al, ; Yan, Wang, Li, Xu, & Deng, ; Yang, Shi, Wu, Wang, & Robinson, ; Yu et al, ). Xiong () summarized the Permian–Triassic granitoids in the EKO and divided them into three stages, that is, the first (270–248 Ma), the second (238–230 Ma), and the third stage (230–185 Ma), representing subduction, syn‐collision, and post–collision extensional settings, respectively.…”

Section: Metallogenic and Geodynamic Constraintsmentioning

confidence: 99%

“…The regional angular unconformity between the Late Triassic terrestrial Babaoshan (Elashan) Formation and the underlying Early-Middle Triassic shallow marine Naocangjian Formation and the Xilikete Formation Yan et al, 2008) indicates that the closure of the A'nyemaqen Ocean and continental collision occurred prior to the Late Triassic. Hence, the late Triassic large-scale granitic magmatism in the EKO generally is associated with syn-collision or postcollisional processes (Hu et al, 2016;Shao et al, 2017;Yan, Wang, Li, Xu, & Deng, 2012;Yang, Shi, Wu, Wang, & Robinson, 2009;Yu et al, 2015). Xiong (2014) 2.…”

Section: Tectonic Settingmentioning

confidence: 99%

“…Numerous researches have been carried out to understand the Triassic magmatism in the EKO. The voluminous Triassic granitoids in the EKO are interpreted to have formed in a subduction, syn‐collision, or postcollisional setting (Chen, Gehrels, Yin, Zhou, & Huang, ; Huang et al, ; Liu, ; Mo et al, ; Ren et al, ; Shao et al, ; Xia et al, ; Xia, Qing, Wang, & Li, ; Yu, Feng, Zhao, & Li, ). However, few studies have focused on the coupling relationship between Cu mineralization and related geodynamic setting.…”

Section: Introductionmentioning

confidence: 99%

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Geological characteristics, metallogenesis, and tectonic setting of porphyry–skarn Cu deposits in East Kunlun Orogen

Wang

Chen

et al. 2018

Geological Journal

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The East Kunlun Orogen (EKO), as the west segment of the Central China Orogen, is the most important Triassic polymetallic metallogenic belt in China. In this paper, we summarize the geological characteristics (stratigraphy, structure, ore‐related plutons, wall rock alteration, and orebodies), ore‐forming fluids and materials, geochronology, and petro‐geochemistry of the representative porphyry–skarn Cu–polymetallic deposits, including the Saishitang, Hutouya, and Kaerqueka deposits in the EKO. The porphyry–skarn Cu deposits in the EKO are mainly distributed in tectonic units of the Qimantagh Belt and the Elashan Belt. Among them, the skarn Cu deposits provide the majority of Cu resources, which mainly occur in the contact zone between the Triassic granitoids and the volcanic–sedimentary rocks (e.g., the Ordovician–Silurian Tanjianshan Group and the Early to Middle Triassic Hongshuichuan Group), and the skarn and orebodies are mainly controlled by interlayer–gliding structures. Ore‐forming fluids of the porphyry Cu deposits are magmatic mixed with meteoric water, whereas the fluids of skarn Cu deposits are mainly of magmatic origin. The higher δ18O (>10‰) of garnet and pyroxene in prograde skarn and wide range of sulphur isotopic compositions (δ34S values from −8.9‰ to 11.0‰) suggest that ore‐forming materials of skarn Cu deposits were partially derived from the country rocks. Based on detailed field investigations, we identified four Cu mineralization types, including veinlet–disseminated Cu (Mo, Au) mineralization occurring within the intrusions, proximal skarn Cu (Fe, Pb, Zn, Au) mineralization, distal skarn Cu mineralization, and distal skarn Pb–Zn (Cu) mineralization. The porphyry–skarn Cu deposits are associated with magmatism that occurred mainly during 235–218 Ma. The ore‐related granitoids are mostly calc‐alkaline I‐type granites, derived from partial melting of the Precambrian basement rocks with various degrees of involvement of mantle components. Combined with the regional tectonic evolution, we conclude that the Cu mineralization in the EKO began with the closure of A'nyemaqen Ocean (~238 Ma) and subsequently culminated in a postcollisional setting (~225 Ma).

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Section: Metallogenic and Geodynamic Constraintsmentioning

confidence: 99%

Section: Tectonic Settingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Geological characteristics, metallogenesis, and tectonic setting of porphyry–skarn Cu deposits in East Kunlun Orogen

Wang

Chen

et al. 2018

Geological Journal

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“…In this hypothesis, during continental collision, the remaining subducted ocean crust undergoes partial melting under amphibolite facies conditions, which produces and preserves granitoid magmas, contributing to net growth of continental crust. Because globally, active seafloor subduction is continuous, but continental collision is episodic, this hypothesis also satisfies the episodic growth of the continental crust and overcomes the difficulties of “island arc model.” This hypothesis has been tested with success along several orogenic belts on the greater Tibetan Plateau (Chen et al, ; Huang et al, ; Mo et al, 2007; Mo et al, ; Niu & O'Hara, ; Niu et al, ; Shao et al, ; Zhang et al, ).…”

Section: Introductionmentioning

confidence: 99%

“…Because globally, active seafloor subduction is continuous, but continental collision is episodic, this hypothesis also satisfies the episodic growth of the continental crust and overcomes the difficulties of "island arc model." This hypothesis has been tested with success along several orogenic belts on the greater Tibetan Plateau Huang et al, 2014;Mo et al, 2007;Mo et al, 2008;Niu & O'Hara, 2009;Niu et al, 2013;Shao et al, 2017;Zhang et al, 2016).…”

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confidence: 99%

The syncollisional granitoid magmatism and crust growth during the West Qinling Orogeny, China: Insights from the Jiaochangba pluton

et al. 2018

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The West Qinling Orogenic Belt (WQOB) is a major portion of the Qinling‐Dabie‐Sulu Orogen and holds essential information for understanding the protracted evolution of the north‐eastern branch of the Paleo‐Tethys in East Asia. In this study, we report our petrological, geochemical, and geochronological study on the five Triassic granitoid plutons of West Qinling with emphasis on the poorly studied Jiaochangba pluton with zircon U–Pb ages of 217.5 ± 1.6 Ma and 215.2 ± 1.2 Ma. The new data and the existing data on the other four plutons support the view that the West Qinling granitoids represent a magmatic response to the continental collision of the Yangtze Block (YB) with the North China Craton (NCC) in the Triassic. Like the other four plutons, the Jiaochangba pluton shows strong light rare earth element (REE) enrichment and weak heavy REE depletion ([La/Sm]N ≈ 7.14 ± 1.89; [Sm/Yb]N ≈ 4.63 ± 1.85) with varying negative Eu anomalies (Eu/Eu* ≈ 0.65 ± 0.20). In the N‐MORB normalized diagram, all the samples show relative enrichment in Rb, Pb, U, and K with negative Nb, Ta, P, and Ti anomalies, resembling those of the model continental crust. The Jiaochangba pluton has relatively lower (87Sr/86Sr)i (0.7062 to 0.7081), higher εNd(t) (−6.91 to −2.09), and εHf(t) (−5.57 to −0.14) than mature continental crust, which are consistent with their source being dominated by lower crust with significant mantle contributions. Mantle‐derived melt, which formed from partial melting of mantle wedge peridotite facilitated by dehydration of the subducted/subducting Mianlue ocean crust, provide the required heat for the crustal melting while also contributing to the compositions of these granitoids. Evolution of such parental magmas in open system crustal magma chambers with continued evolution/replenishment and crustal contamination and assimilation give rise to the observed petrological and geochemical characteristics of these granitoids.

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Origin of the Late Permian gabbros and Middle Triassic granodiorites and their mafic microgranular enclaves from the Eastern Kunlun Orogen Belt: Implications for the subduction of the Palaeo‐Tethys Ocean and continent–continent collision

et al. 2018

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The geodynamic evolution of the Eastern Kunlun Orogen Belt (EKOB) during the late Palaeozoic-Early Mesozoic remains controversial. Here, we present new zircon U-Pb, element geochemical, and Sr-Nd-Hf isotopic data for the Kaerqueka gabbros, granodiorites, and their mafic microgranular enclaves (MMEs) in the Qiman Tahg area of Qinghai Province (QTQP), western EKOB, with a view to constrain their petrogenesis and tectonic setting. New LA-ICP-MS zircon U-Pb ages indicate that the Kaerqueka gabbro, granodiorite, and its MMEs were emplaced at 257 ± 2, 244 ± 1, and 245-244 Ma, respectively. Based on our new ages and published data, three major episodes of magmatism (ca. 263-249, 247-240, and 237-211 Ma) during the Late Permian-Triassic are recognized in the EKOB. The gabbros are characterized by low SiO 2 concentrations and are potassic with high K 2 O contents and K 2 O/Na 2 O ratios. They are enriched in light rare earth elements (LREEs) and large-ion lithophile elements (LILEs) and have ( 87 Sr/ 86 Sr) i of 0.70737-0.70851, εNd (t) of −2.8 to −2.7 and εHf (t) of +0.7 to +2.9, indicating that the gabbros were derived from an enriched lithospheric mantle which was affected by slab-derived fluids or melts. The MMEs and host granodiorites are enriched in LREEs and depleted in high-field-strength elements and have ( 87 Sr/ 86 Sr) i of 0.71090-0.71129, εNd (t) of −6.58 to −5.21, and εHf (t) of −5.3 to −1.8. Indistinguishable crystallization age, trace element pattern and isotopic compositions between the MMEs and host granodiorites indicate that they are cogenetic and were dominantly originated from the partial melting of Mesoproterozoic juvenile mafic lower crust. Combined with our new results and published geological, geochronological, and geochemical data, we propose that the subduction of the Palaeo-Tethyan Ocean lasted from Late Permian to Early Triassic, and that the onset of the collision mostly occurred during the Middle Triassic in the EKOB.

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Petrogenesis of Triassic granitoids in the East Kunlun Orogenic Belt, northern Tibetan Plateau and their tectonic implications

Cited by 105 publications

References 64 publications

Geological characteristics, metallogenesis, and tectonic setting of porphyry–skarn Cu deposits in East Kunlun Orogen

Geological characteristics, metallogenesis, and tectonic setting of porphyry–skarn Cu deposits in East Kunlun Orogen

The syncollisional granitoid magmatism and crust growth during the West Qinling Orogeny, China: Insights from the Jiaochangba pluton

Origin of the Late Permian gabbros and Middle Triassic granodiorites and their mafic microgranular enclaves from the Eastern Kunlun Orogen Belt: Implications for the subduction of the Palaeo‐Tethys Ocean and continent–continent collision

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