The multi-stage tectonic evolution of the Xitieshan terrane, North Qaidam orogen, western China: From Grenville-age orogeny to early-Paleozoic ultrahigh-pressure metamorphism

Zhang, Cong; Bader, Thomas; Zhang, Lifei; Roermund, Herman van

doi:10.1016/j.gr.2015.04.011

Cited by 43 publications

(21 citation statements)

References 88 publications

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“…The latter is coeval with the UHP eclogite-facies metamorphism (440-420 Ma) during the continental collision in North Qaidam UHPM belt Song et al, 2010Song et al, , 2012Song et al, , 2014Zhang et al, 2015).…”

Section: Zircon U-pb Agesmentioning

confidence: 89%

“…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%

“…(1) the Cambrian ophiolite with protolith ages of ~540-500 Ma Song et al, 2009), and (2) Neoproterozoic CFB with protolith ages of 850-820 Ma (Chen et al, 2009;Song et al, 2010;Zhang et al, 2010;Zhang et al, 2015). The peak metamorphic P-T conditions for both types of eclogites have been estimated in ranges of P = 2.6-3.5 GPa and T = 600-830°C, and zircons from these eclogites yielded HP-UHP metamorphic ages ranging from 470 Ma to 420 Ma, indicating a complete orogenic process from oceanic subduction to continental collision (Song et al, 2014 and references herein).…”

Section: Eclogite Blocks In N Qaidam Uhpm Beltmentioning

confidence: 99%

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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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Section: Zircon U-pb Agesmentioning

confidence: 89%

Section: Geological Settingmentioning

confidence: 99%

Section: Eclogite Blocks In N Qaidam Uhpm Beltmentioning

confidence: 99%

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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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“…Gao and Zhang () contend that these age populations represent the ancient continental nucleus, the collision and break‐up of the Rodinia supercontinent, and the evolution of the Palaeo‐Qilian Ocean, respectively. Recent studies have also focused on the partial melting of the HP‐UHP rock in this zone, estimated at 438–410 Ma (Cao et al, ; Chen et al, ; Song, Niu, Su, Wei, & Zhang, ; Song, Niu, Su, Zhang, & Zhang, ; Yu, Zhang, Mattinson, et al, ; Yu, Zhang, Sun, Li, & Gong, , ; Yu, Zhang, Sun, Real, et al, ; Zhang et al, ). However, statistical findings regarding the peak UHP metamorphism and partial melting ages of the four terranes vary.…”

Section: Geological Backgroundmentioning

confidence: 99%

“…However, zircon domains from subducted and exhumed rocks may not preserve the full geochronology from protolith to subduction and exhumation. Zircon protoliths can be substantially or entirely modified or recrystallized during ultrahigh‐temperature (UHT) and ultrahigh‐pressure (UHP) metamorphism (e.g., Berger et al, ; Ren, Chen, Kelsey, Gong, & Liu, ; Zhang, Bader, Zhang, & Roermund, ); meanwhile, peak zircons may be altered by partial melting and subsequent retrogression (Cao et al, ; Liu, Gu, Li, Hou, & Song, ). Nevertheless, zircons in some migmatite or eclogite from UHP metamorphic belts may contain important information about protoliths, UHP metamorphism, and subsequent retrogression (Corrie, Kohn, & Vervoort, ; Du, Zhang, Shen, & Bader, ; Glodny, Kühn, & Austrheim, ; Liu et al, ; Liu & Liou, ; Loury et al, ; Tan et al, ; Yu, Zhang, Sun, Real, et al, ; Zheng et al, ).…”

Section: Introductionmentioning

confidence: 99%

Tracking the timing and nature of protolith, metamorphism, and partial melting of tourmaline‐bearing migmatites by zircon U–Pb and Hf isotopic compositions in the Yuka terrane, North Qaidam UHP metamorphic belt

Gao

Chen

et al. 2018

Geological Journal

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An integrated study using cathodoluminescence (CL) images, U–Pb geochronology, and Hf isotopic characterization of zircons was performed on migmatites from the Yuka terrane to provide insights into the timing and nature of the protoliths, metamorphism, and partial melting of these rocks. Zircon grains separated from the migmatites have three distinct domains. Residual zircon cores in samples YKT01 and YKT02 exhibit oscillatory zoning, high Th/U ratios (0.10–0.79), steep heavy rare earth element (HREE) patterns, and mean ages of 936 ± 5 Ma and 927 ± 11 Ma, respectively, indicating that they are igneous in origin and record Neoproterozoic magmatism during the Grenvillian Orogeny. CL‐grey cores record an ultrahigh‐pressure (UHP) peak metamorphism age of 435 ± 5 Ma and have low Th/U and 176Lu/177Hf ratios, weak negative Eu anomalies, and relatively flat HREE patterns. The CL‐bright rims have steep HREE patterns with lower middle rare earth element (MREE) concentrations but higher HREE concentrations compared with the metamorphic cores and a weighted average age of 422 ± 4 Ma, which records the timing of melt crystallization. The migmatites incorporate garnet relicts coexisting with fluid inclusions and hydrous minerals like peritectic phengite and peritectic large anhedral poikilitic tourmaline in the leucosomes. Peak temperatures are less than 750°C, suggesting that the anatectic melts may be derived from melting of felsic gneiss in the presence of water. The timing of melt crystallization is ca. 13 Ma later than UHP metamorphism, indicating that the partial melting took place during the exhumation stage. The metamorphic zircon cores have higher 176Hf/177Hf(t) ratios than the residual magmatic cores, which provides powerful evidence for the generation of the metamorphic zircons through the incorporation of internal high Hf minerals other than zircon in a closed system. Anatectic rims with lower 176Hf/177Hf(t) ratios but higher 176Lu/177Hf ratios than metamorphic cores suggest that the main formation mechanism is dissolution‐reprecipitation of pre‐existing zircons. In conclusion, the elevated 176Hf/177Hf(t), TDM2 age and decreasing 176Lu/177Hf(t) ratios in the metamorphic and anatectic domains imply that the new zircons in some migmatites and granites may not reflect the Hf isotope compositions of their source rocks, accounting for the variable Hf isotope compositions in S‐type granites.

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The nature and history of the South Qilian orogenic belt: Constraints from compositions of rivers' sediments and their detrital zircon U–Pb geochronology, Lu‐Hf isotopic compositions

Kang

Chen

2019

Geological Journal

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Detrital zircon U-Pb dating, Hf isotopic data, and Nd isotopic compositions of river sediments are used to constrain crustal evolution processes of their provenance in the South Qilian orogenic belt. The detrital zircons from the Yuka, Tataleng, and Bayinguole rivers range in age from Neoarchean (2,772 Ma) to Permian (261 Ma), with age peaks at ca. 2.4 Ga, ca. 1.95 Ga, and ca. 0.45 Ga. Hf isotopic compositions of Paleoproterozoic, Pan-African, and Caledonian zircon age groups display a wide range of ε Hf (t) values, suggesting diverse sources of host magma of the zircon grains. The basement formation of the South Qilian orogenic belt from depleted mantle occurred at two stages; ca. 3.1-2.5 Ga and ca. 2.0-1.6 Ga. Meanwhile, the Nd model ages of silt-mud from the region are between 1.98 Ga and 2.27 Ga with an average value of 2.12 Ga. Our study indicates that the Qilian oceanic plate formed between the Qaidam and Alxa blocks from late Neoproterozoic to Silurian. The South Qilian orogenic belt is a product of the Qilian Ocean closure and subsequent collision between the Qaidam Block and central Qilian belt during Ordovician-Silurian times. Combining regional tectonothermal events with new results of river sediments suggests that rifting from a continent and opening of the Qilian Ocean occurred at ca. 780-520 Ma, subduction of the oceanic crust at ca. 520-440 Ma, ocean closure and continental subduction at ca. 440-420 Ma, exhumation of subducted crust at ca. 420-400 Ma, and orogenic collapse and extension at ca. 400-360 Ma. KEYWORDS detrital zircon, formation and evolution of crust, Nd isotope, Qilian oceanic plate, South Qilian orogenic belt, U-Pb-Hf isotopes

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The multi-stage tectonic evolution of the Xitieshan terrane, North Qaidam orogen, western China: From Grenville-age orogeny to early-Paleozoic ultrahigh-pressure metamorphism

Cited by 43 publications

References 88 publications

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

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

Tracking the timing and nature of protolith, metamorphism, and partial melting of tourmaline‐bearing migmatites by zircon U–Pb and Hf isotopic compositions in the Yuka terrane, North Qaidam UHP metamorphic belt

The nature and history of the South Qilian orogenic belt: Constraints from compositions of rivers' sediments and their detrital zircon U–Pb geochronology, Lu‐Hf isotopic compositions

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