Geochemistry and trace element behaviors of eclogite during its exhumation in the Xitieshan terrane, North Qaidam UHP belt, NW China

Zhang, Cong; Zhang, Lifei; Bader, Thomas; Song, Shuguang; Lou, Yuxing

doi:10.1016/j.jseaes.2012.09.021

Cited by 33 publications

(15 citation statements)

References 115 publications

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“…However, evidence for this Proterozoic ocean is lacking. This not only limited further discussion on Proterozoic evolution of the NQOB and the palaeo‐position of the Qaidam Block within the supercontinent Rodinia but also resulted in all oceanic‐type eclogites in North Qaidam being classified as Early Palaeozoic oceanic‐type eclogites (Song et al., ; Zhang, Chen, et al., ; Zhang, Liu, et al., ), which makes the timing of Early Palaeozoic oceanic subduction and continental subduction highly debated (Liu et al., ; Ren et al., ; Song et al., , ; Zhang, Chen, et al., ; Zhang, Liu, et al., ; Zhang, Zhang, Bader, et al, ; Zhang, Zhang, & Christy, ; Zhang, Chen, et al, ).…”

Section: Discussionmentioning

confidence: 99%

Metamorphic evolution of a newly identified Mesoproterozoic oceanic slice in the Yuka terrane and its implications for a multi‐cyclic orogenic history of the North QaidamUHPMbelt

Ren

Chen

Kelsey

et al. 2018

Journal Metamorphic Geology

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The North Qaidam Orogenic Belt (NQOB), lying at the northern margin of the Tibet Plateau, records two orogenic cycles: A Proterozoic cycle related to the amalgamation and breakup of the supercontinent Rodinia, and an Early Palaeozoic cycle including oceanic subduction and continental deep subduction. At present, the only information about the Proterozoic cycle is the concurrent c. 1,000-900 Ma magmatic and metamorphic events, which limited the understanding of the Proterozoic evolution of NQOB and the relationship between the Qaidam Block and other Rodinia fragments. In this study, a kyanite-bearing eclogite was identified in Yuka terrane. It has positive-slope chondrite-normalized rare earth element distribution patterns, similar to present-day N-MORB. LA-ICP-MS zircon U-Pb dating obtained a protolith age of 1,273 Ma and an eclogite facies metamorphic age of 437 Ma, which is similar to the continental deep subduction age of the Yuka terrane. Zircon Lu-Hf analysis show that the magmatic zircon cores have high eHf(t) of 8.36-15.98 and T DM1 of 1,450-1,131 Ma (M = 1,303 AE 55 Ma, consistent with its protolith age within error), indicating a juvenile crust protolith of the eclogite. The MORB-like whole-rock composition and zircon U-Pb and Lu-Hf analysis indicate that the protolith of the kyanitebearing eclogite was a Mesoproterozoic oceanic slice. P-T pseudosection analysis shows that the kyanite-bearing eclogite experienced four metamorphic stages: (1) a prograde stage with the assemblage garnet+omphacite+talc+lawsonite+phen-gite+quartz at 22.4-23.2 kbar and 585°C; (2) a peak stage with the assemblage garnet+omphacite+lawsonite+phengite+coesite at 32.5 kbar and 670°C; (3) an early retrograde stage with the assemblage garnet+omphacite+kyanite+phen-gite+coesite/quartzAElawsonite at 27.1-30.0 kbar and 670-690°C; and (4) a late retrograde stage with the assemblage garnet+omphacite+epidote+horn-blende+phengite+quartz at <18.0 kbar. The established clockwise P-T path is similar with other continental-type eclogites in this area. On the basis of the geochemical and geochronological data, as well as the P-T path, we suggest that the protolith of the kyanite-bearing eclogite was emplaced in the active margin of the Qaidam Block during the assembly of Rodinia and underwent continental deep subduction in the Early Palaeozoic. We conclude that (1) the Qaidam Block

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Section: Discussionmentioning

confidence: 99%

Metamorphic evolution of a newly identified Mesoproterozoic oceanic slice in the Yuka terrane and its implications for a multi‐cyclic orogenic history of the North QaidamUHPMbelt

Ren

Chen

Kelsey

et al. 2018

Journal Metamorphic Geology

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“…gneisses recorded a Grenville-age orogenesis at ~1020-900 Ma (Wan et al, 2006;Song et al, 2012Song et al, , 2014Zhang et al, 2012Zhang et al, , 2015Yu et al, 2013). Coesite and diamond inclusions have been identified in zircons and garnets from the metapelites, eclogites and garnet peridotites, which suggest that the UHP metamorphism occurred at depths of 100-200 km at 438-420 Ma (Song et al, 2014 and references therein).…”

Section: Geological Settingmentioning

confidence: 99%

“…(c) FeOt/MgO versus TiO 2 diagram (Miyashiro, 1974). Chen et al (2009b) and Song et al (2010); the Dulan and Xitieshan eclogites from Zhang et al (2012) and Yu et al (2013). The average value of Suxiong alkaline basalts (blue line) in the Kangdian Rift of South China is from Li et al (2002).…”

Section: Tectonic Evolution From Supercontinental Breakup To Continenmentioning

confidence: 99%

An 850–820Ma LIP dismembered during breakup of the Rodinia supercontinent and destroyed by Early Paleozoic continental subduction in the northern Tibetan Plateau, NW China

Song

Allen

et al. 2016

Precambrian Research

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“…Therefore, it is likely that the partial melting of metabasite in the Dulan unit, which produced tonalitic and trondhjemitic melts and left behind residues of garnet + clinopyroxene + plagioclase, was triggered by the dehydration melting of dominant amphibole and rare zoisite. Similarly, the partial melting of metagabbros under granulite facies conditions in an arc root to form tonalitic and trondhjemitic melts has also been observed in the Kohistan, Amalaoulaou, New Zealand, and Gangdese arcs (Figure ) (Berger et al, ; Stowell et al, ; C. Zhang et al, ).…”

Section: Discussionmentioning

confidence: 79%

TTG‐Adakitic‐Like (Tonalitic‐Trondhjemitic) Magmas Resulting From Partial Melting of Metagabbro Under High‐Pressure Condition During Continental Collision in the North Qaidam UHP Terrane, Western China

Zhang

et al. 2019

Tectonics

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The tectonic regime and melting conditions of adakitic tonalitic-trondhjemitic leucosomes and tonalite plutons from the North Qaidam terrane are evaluated through petrology, whole-rock major, trace element and Sr-Nd isotopic data and zircon U-Pb data. Zircons from leucosomes and metabasites preserve distinct U-Pb age populations: early Ordovician inherited zircon cores record a protolith age of~470 Ma, whereas zircon rims preserve subsequent HP granulite facies metamorphism, anatexis, and magmatism between 437 and 433 Ma. Whole-rock geochemistry suggests that three types of leucosomes and tonalite plutons have geochemical features similar to adakites. Type 1 leucosomes record high Sr contents and positive Eu anomalies representing an earlier period of plagioclase accumulation. The flat fractionated rare earth element patterns of type 2 leucosomes correspond to residues of HP mafic granulites, and the steep fractionated rare earth element patterns of type 3 leucosomes correspond to garnet-and clinopyroxene-rich residues. Petrological observations with P-T paths and experimentally constrained melting curves together infer that melting of the metagabbro were triggered by the breakdown of amphibole ± zoisite under high-pressure conditions. Therefore, tonalite, trondhjemite, and granodiorite (TTG)-adakitic magmas in the North Qaidam terrane were produced through partial melting of newly emplaced gabbroic rocks with an arc affinity under high-pressure, granulite facies conditions in a thickened lower crust during continental collision. This model explains the origin of TTG-adakitic rocks and related continental growth and crustal differentiation genetically associated with continental collision.

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Geochemistry and trace element behaviors of eclogite during its exhumation in the Xitieshan terrane, North Qaidam UHP belt, NW China

Cited by 33 publications

References 115 publications

Metamorphic evolution of a newly identified Mesoproterozoic oceanic slice in the Yuka terrane and its implications for a multi‐cyclic orogenic history of the North QaidamUHPMbelt

Metamorphic evolution of a newly identified Mesoproterozoic oceanic slice in the Yuka terrane and its implications for a multi‐cyclic orogenic history of the North QaidamUHPMbelt

An 850–820Ma LIP dismembered during breakup of the Rodinia supercontinent and destroyed by Early Paleozoic continental subduction in the northern Tibetan Plateau, NW China

TTG‐Adakitic‐Like (Tonalitic‐Trondhjemitic) Magmas Resulting From Partial Melting of Metagabbro Under High‐Pressure Condition During Continental Collision in the North Qaidam UHP Terrane, Western China

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