Compositional and Sr–Nd–Hf isotopic variations of Baijingsi eclogites from the North Qilian orogen, China: Causes, protolith origins, and tectonic implications

Ker, C.; Yang, Huai Jen; Zhang, Jianxin; Shau, Yen Hong; Chieh, Chia Ju; Meng, Fanwei; Takazawa, Eiichi; You, Chen Feng

doi:10.1016/j.gr.2014.06.006

Cited by 37 publications

(15 citation statements)

References 91 publications

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“…Nonetheless, studies on mafic rocks affected by regional metamorphism indicate that the LILE abundances are strongly susceptible to modification, while the LREE abundances are generally weakly modified, and the HFSE and HREE contents are mostly unmodified (e.g., Becker et al, 1999Becker et al, , 2000John et al, 2004;Tropper and Manning, 2005;Liu et al, 2007;Tang et al, 2007;Ker et al, 2014). In the MORB-normalized diagrams (Figs.…”

Section: Element Mobility and Protolith Controls On Trace Element Andmentioning

confidence: 99%

Geochemistry and age of mafic rocks from the Votuverava Group, southern Ribeira Belt, Brazil: Evidence for 1490 Ma oceanic back-arc magmatism

Campanha

Faleiros

Basei

et al. 2015

Precambrian Research

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Section: Element Mobility and Protolith Controls On Trace Element Andmentioning

confidence: 99%

Geochemistry and age of mafic rocks from the Votuverava Group, southern Ribeira Belt, Brazil: Evidence for 1490 Ma oceanic back-arc magmatism

Campanha

Faleiros

Basei

et al. 2015

Precambrian Research

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“…The NQL, located between the Alxa Block and Qilian Block, is characterized by the ophiolite, HP/LT blueschist and eclogite, island‐arc volcanic rocks with granite plutons, and Silurian flysch formations, relating to subduction of north Qilian Ocean in the early Paleozoic (Ker et al, ; Wang & Liu, ; Wu et al, ; Xia, Xia, & Xu, ; Xiao et al, , ; Xu et al, ; Zhang et al, ; Zhang et al, ; Zheng, Xiao, & Zhao, ). Three ophiolite belts have been recognized in the NQL (Xia, Li, Yu, & Wang, ), including the 550‐Ma Yushigou ophiolite belt in the south (Shi, Yang, & Wu, ), the 517‐ to 487‐Ma Dachadaban ophiolite belt in the middle (Meng, Zhang, Kar, & Li, .…”

Section: Geological Settingmentioning

confidence: 99%

Early Paleozoic arc magmatism and metamorphism in the northern Qilian Block, western China: Petrological and geochronological constraints

Peng

Zhang

et al. 2017

Geological Journal

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The Datong–Menyuan Complex, located in the northern margin of the Qilian Block, is composed dominantly of high‐grade metamorphic rocks covered by a Paleozoic–Mesozoic sedimentary sequence. In this study, we present petrographic observation, conventional thermobarometry and P–T pseudosection modelling, whole‐rock major and trace geochemistry, zircons U–Pb dating and Hf isotopic data together, to reveal the relationship between the magmatism and metamorphism along the northern margin of the Qilian Block. The anticlockwise P–T paths of gneiss and amphibolites are obtained using the garnet isopleths thermobaromety combined with phase equilibria modelling. The P–T pseudosection also shows that the gneiss and amphibolite underwent similar retrograde metamorphism with slightly different peak metamorphic conditions at ~720 °C and ~6.4 kbar for the former and ~700 °C and ~7.1 kbar for the latter. This indicates the Datong–Menyuan Complex recorded an amphibolite–granulite‐facies metamorphism. The zircon U–Pb analyses of 3 intrusive rocks including granitic dike, diorite, and granite are dated at ca. 499.8 ± 4.3, 495.9 ± 3.3, and 505.5 ± 3.2 Ma, and 3 representative metamorphic rocks underwent contemporaneous metamorphism at ca. 498.9 ± 4.1, 504.4 ± 3.9, and 499.3 ± 2.9 Ma. Zircon Hf isotopic analyses show that 505‐Ma zircons from the granitoid have positive εHf(t) values ranging from +8.5 to +12.8, indicating a depleted mantle source. Based on the penecontemporaneous magmatic and metamorphic event, we suggest that the southward subduction of the north Qilian Ocean triggered the activity of mantle‐derived magma and coeval metamorphic event. A subsequent compression is attributed to crustal thickening, indicating counter clockwise P–T paths. Combining these data with previous studies, it suggests paired metamorphic belts: the penecontemporaneous high‐temperature metamorphic belt related to an arc along the northern Qilian Block and high‐pressure/low‐temperature metamorphic belt existed in the north Qilian suture.

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“…An accretionary prism represents the key link between plate tectonics and orogenesis, and its structures and components can be used to clarify the geodynamic histories of convergent plates and the tectonic‐geomorphic evolution of adjacent areas (C. Y. Huang et al, ; Lan et al, ). More importantly, the accreted mafic rocks within accretionary prisms are the only acquirable samples of subducted oceanic crust and igneous seamounts; thus, they are valuable for revealing the mantle nature of convergent plates and constraining regional magmatic histories (Ker et al, ; Safonova et al, ).…”

Section: Introductionmentioning

confidence: 99%

“…Huang et al, 2012;Lan et al, 2015). More importantly, the accreted mafic rocks within accretionary prisms are the only acquirable samples of subducted oceanic crust and igneous seamounts; thus, they are valuable for revealing the mantle nature of convergent plates and constraining regional magmatic histories (Ker et al, 2015;Safonova et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Geochemistry and Geochronology of the Accreted Mafic Rocks From the Hengchun Peninsula, Southern Taiwan: Origin and Tectonic Implications

et al. 2019

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The accretionary prism of the Hengchun Peninsula at the southernmost tip of the active Taiwan orogen has newly emerged due to the transition from a subduction zone to an arc‐continent collision zone. The mafic rocks within the Hengchun accretionary prism, whose provenance has long been controversial, are highly indicative of the mantle nature and tectonic evolution around the northern Manila Trench. Based on geochemical analyses, the accreted basalts are classified as normal and enriched mid‐ocean ridge basalts (N‐MORB and E‐MORB) and alkaline ocean island basalts. The N‐MORBs, which exhibit geochemical signatures indicative of virtually unmetasomatized depleted MORB mantle and yield zircon U‐Pb ages of 22.8 ± 0.3 and 24.2 ± 1.1 Ma, were off‐scraped from the subducted oceanic crust of the South China Sea (SCS). The alkaline ocean island basalts are considered fragments of subducted seamount due to their geochemical similarity with seamount basalts from the SCS. The Hf‐Nd isotopic compositions of basalts from the north SCS may represent the contributions of recycled oceanic crust and the upwelling Hainan Plume. The E‐MORBs, which exhibit similar geochemical compositions as rocks from the Huatung Basin and yield an 40Ar/39Ar age of 135.0 ± 5.6 Ma, were removed from the overriding plate due to the excessive shear stress between the converging plates and were laterally transported by strike‐slip movement; alternatively, they were off‐scraped from the subducted Luzon forearc slices. The temporary uplift and collapse of the accretionary prism caused by seamount subduction may have been responsible for the genesis of the lenticular Shihmen Conglomerate.

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Compositional and Sr–Nd–Hf isotopic variations of Baijingsi eclogites from the North Qilian orogen, China: Causes, protolith origins, and tectonic implications

Cited by 37 publications

References 91 publications

Geochemistry and age of mafic rocks from the Votuverava Group, southern Ribeira Belt, Brazil: Evidence for 1490 Ma oceanic back-arc magmatism

Geochemistry and age of mafic rocks from the Votuverava Group, southern Ribeira Belt, Brazil: Evidence for 1490 Ma oceanic back-arc magmatism

Early Paleozoic arc magmatism and metamorphism in the northern Qilian Block, western China: Petrological and geochronological constraints

Geochemistry and Geochronology of the Accreted Mafic Rocks From the Hengchun Peninsula, Southern Taiwan: Origin and Tectonic Implications

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