Tracing the 850-Ma continental flood basalts from a piece of subducted continental crust in the North Qaidam UHPM belt, NW China

Song, Shuguang; Su, Li; Li, Xian‐Hua; Zhang, Guibing; Niu, Yaoling; Zhang, Lifei

doi:10.1016/j.precamres.2010.09.008

Cited by 199 publications

(81 citation statements)

References 57 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: 88%

“…(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%

“…The CFB-type eclogites with protolith ages of 850-820 Ma in Yuka terrane have been descripted by Song et al (2010), while those occurred in the Xitieshan and Dulan terranes are shown in Figure 4. They all occur in large blocks intercalated with granitic and pelitic gneisses.…”

Section: Eclogite Blocks In N Qaidam Uhpm Beltmentioning

confidence: 99%

“…The common lead correction was done following Andersen (2002). Analytical details are described in Song et al (2010). The standard Qinghu zircons give a concordia age of 162.0 ± 0.6 Ma (n = 10, MSWD = 1.4).…”

Section: Eclogite Blocks In N Qaidam Uhpm Beltmentioning

confidence: 99%

“…In the last decade, the origin and age of eclogite protoliths in North Qaidam UHPM belt have been studied (Song et al, 2014 and references therein). The eclogite blocks are dominantly derived from the 850-820 Ma CFBs with minor fragments of the 540-500 Ma oceanic crust (e.g., Zhang et al, 2008Zhang et al, , 2010Chen et al, 2009b;Song et al, 2009Song et al, , 2010Yu et al, 2013). (Fig.…”

Section: Protoliths Of North Qaidam Uhpm Eclogites: Cfbs Subducted Tomentioning

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: 88%

Section: Eclogite Blocks In N Qaidam Uhpm Beltmentioning

confidence: 99%

Section: Eclogite Blocks In N Qaidam Uhpm Beltmentioning

confidence: 99%

Section: Eclogite Blocks In N Qaidam Uhpm Beltmentioning

confidence: 99%

Section: Protoliths Of North Qaidam Uhpm Eclogites: Cfbs Subducted Tomentioning

confidence: 99%

See 3 more Smart Citations

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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Detrital zircon record of rivers' sediments in the North Qilian Orogenic Belt: Implications of the tectonic evolution of the northeastern Tibetan Plateau

Kang

Chen

et al. 2018

Geological Journal

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The North Qilian Orogenic Belt (NQOB) is an important element of the northern edge of the Tibetan Plateau, and several rivers run along it. Zircon U–Pb dating, trace elements, and Hf isotopic data derived from the sediments carried by the rivers have been used to deduce the crustal evolution of the NQOB. U–Pb ages obtained from detrital zircons found in the sediments of the Zamu, Zhuanglan, and Beida rivers can be divided into five major age groups, that is, 2,600–1,500, 1,500–1,100, 1,100–650, 550–400, and 360–150 Ma, and the corresponding peaks occur at ~2,450, ~1,750, ~950, ~450, and ~250 Ma. Archean components, which may be derived from the ancient continental nucleus in the region, are rare in the river sediments. The zircon grains with ages of 360–150 Ma are most likely related to crustal thickening and decompression melting in a post‐collisional tectonic setting. The age distribution patterns indicate that the sediments carried by the Zamu, Zhuanglang, and Beida rivers are derived from the NQOB. Furthermore, the Hf isotopic compositions of Meso‐ and Neoarchean, Mesoproterozoic, Grenvillian, Pan‐African, Caledonian, and Hercynian zircon age groups exhibit a wide range of εHf (t) values, suggesting diverse sources. The existence of strongly negative εHf (t) values among the Grenvillian and Paleoproterozoic zircons indicates that the source magma included reworked Palaeoarchean crustal materials. New results indicate that continental rifting and the opening of the Qilian Ocean occurred at 775–520 Ma; the subduction and closure of the Qilian Ocean occurred at 520–440 Ma; arc–continent collision and continental subduction occurred at 440–420 Ma; and orogen collapse and extension occurred at 400–360 Ma. Our study indicates that the formation of the NQOB was mainly related to the evolutionary history of the Proto‐Tethys Ocean.

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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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Tracing the 850-Ma continental flood basalts from a piece of subducted continental crust in the North Qaidam UHPM belt, NW China

Cited by 199 publications

References 57 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

Detrital zircon record of rivers' sediments in the North Qilian Orogenic Belt: Implications of the tectonic evolution of the northeastern Tibetan Plateau

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

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