U–Pb geochronology of paragneisses and metabasite in the Xitieshan area, north Qaidam Mountains, western China: Constraints on the exhumation of HP/UHP metamorphic rocks

Zhang, Jian Xin; Mattinson, Chris G.; Meng, Fancong; Yang, Huai Jen; Wan, Y.

doi:10.1016/j.jseaes.2008.08.008

Cited by 59 publications

(45 citation statements)

References 57 publications

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“…Several researchers have proposed that the rocks underwent eclogite facies metamorphism at 460-440 Ma or even earlier Zhang et al, 2009c). The ages presented in this paper are slightly younger and substantiate recently published ages of 433 ± 3 Ma (bimineralic eclogite; Song et al, 2011) and 432 ± 14 Ma (coesite-bearing retrograded eclogite; Liu et al, 2012).…”

Section: The Paleozoic Multi-stages Metamorphism In the Xitieshan Tersupporting

confidence: 88%

“…Both U-Pb zircon ages were interpreted to reflect continental subduction/collision and are consistent within errors with the age results from eclogites investigated in this study. A 437 ± 6 Ma SHRIMP zircon age from garnet-and sillimanite-bearing biotite gneiss may reflect the same event (Zhang et al, 2009c). There are even some eclogite samples that preserve evidence for two stages of early Paleozoic metamorphic growth within their zircon grains.…”

Section: The Paleozoic Multi-stages Metamorphism In the Xitieshan Termentioning

confidence: 94%

“…Kyanite is a noteworthy constituent of some samples. Two stages of amphibolite to highpressure granulite facies metamorphism were distinguished in the same kyanite-bearing pelitic gneiss sample using geothermobarometry and phase equilibrium modeling (Zhang et al, 2009c;Zhang et al, 2012). In-situ electron microprobe monazite-and SHRIMP zircon UPb dating techniques were used to produce overlapping Neoproterozoic and Early Paleozoic ages, attributed to polyphase metamorphism, a phenomena also recognized in the mineral record .…”

Section: Geological Backgroundmentioning

confidence: 99%

See 2 more Smart Citations

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

et al. 2017

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Section: The Paleozoic Multi-stages Metamorphism In the Xitieshan Tersupporting

confidence: 88%

Section: The Paleozoic Multi-stages Metamorphism In the Xitieshan Termentioning

confidence: 94%

Section: Geological Backgroundmentioning

confidence: 99%

See 1 more Smart Citation

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

et al. 2017

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“…As formas clássicas de ocorrência de rochas granulíticas incluem os maciços granulíticos (Rötzler & Romer, 2001), faixas encaixadas em cinturões orogênicos do tipo alpino (Montanini & Harlov, 2006), boudins com dimensões métricas em terrenos metamórfi cos da fácies eclogito (Zhang et al, 2009), nódulos centimétricos em pipes kimberlíticos (Rogers, 1977), além de xenólitos em rochas magmáticas de fi liação mantélica (Stosch & Lugmair, 1984).…”

Section: Discussão Dos Resultadosunclassified

Ocorrência de rochas da fácies granulito no Cinturão Mineiro, Minas Gerais, Brasil

Gomes

Evangelista

Júnior

et al. 2010

Rem: Rev. Esc. Minas

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ResumoNa região de Lagoa Dourada, inserida no Cinturão Mineiro, ocorrem granitóides paleoproterozóicos, que intrudem seqüências supracrustais arqueanas do greenstone belt Rio das Velhas. Os granitóides são cortados por rochas máfi cas anfi bolitizadas, que portam xenólitos de granulitos. Trata-se de granulitos máfi -cos caracterizados pela textura granoblástica e pela paragênese ortopiroxênio-clinopiroxênio-anfi bólio-plagioclásio. Como fases secundárias, registram-se actinolita, cummingtonita, carbonato, epídoto, granada e quartzo. Determinações geotermométricas baseadas nos pares minerais ortopiroxênio-clinopiroxênio e anfi bólio-plagioclásio produziram valores de temperatura entre 700 e 853ºC. As fases secundárias são produtos de um processo metamórfi co posterior. Palavras-chave:Cinturão Mineiro, granulitos máficos, química mineral, geotermometria. Abstract Paleoproterozoic granitoids intruding the Archean greenstone belt of Rio das

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“…These works have shed light on the protolith nature of the deeply subducted crust involved Song et al, 2007bSong et al, , 2010, the timing, timescale and spatial distribution of the UHP metamorphism (Song et al, 2003a;Mattinson et al, 2006Mattinson et al, , 2009Chen et al, 2007a, b;Zhang et al, 2008;Zhang et al, 2011a, b), the possible depth of continental subduction (Song et al, 2005aZhang et al, 2009a), the mechanisms of subduction and exhumation (Yang et al, 2002Xu et al, 2006;Song et al, 2009b;Xu et al, 2010), and the pressure-temperature-time (P-T-t) histories constraining the tectono-metamorphic processes of different units in this region (Chen et al, 2005;Zhang et al, 2005Zhang et al, , 2007Song et al, 2007a;Menold et al, 2009;Zhang et al, 2009b).…”

Section: Geological Settingmentioning

confidence: 99%

Retrograde metamorphism of the eclogite in North Qaidam, western China: Constraints by joint 40Ar/39Ar in vacuo crushing and stepped heating

Wijbrans

Brouwer

et al. 2015

Geoscience Frontiers

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a b s t r a c tTwo amphiboles and a syn-metamorphic quartz vein from the Yuka terrane, North Qaidam, western China, have been analyzed by joint 40 Ar/ 39 Ar crushing in vacuo and stepwise heating techniques. The crushing in vacuo results provide information to directly constrain the timing of fluid activity and the age of amphibolite-facies retrogression. The stepwise heating results could further be used to decipher the thermal history of the UHP rocks. Amphiboles from amphibolites and quartz vein within garnetamphibolite lens analyzed by in vacuo crushing yield similarly shaped age spectra and exhibit relatively flat age plateaus for the last several steps. The characteristics of gas release patterns and geochronological data testify to the presence of significant excess 40 Ar within the fluid inclusions. The age plateaux with weighted mean ages (WMA) ranges from 488 to 476 Ma for amphiboles and 403 Ma for quartz (2s). These data points constitute amphibole WMA yielding excellent isochrons with isochron ages of 469 and 463 Ma with initial 40 Ar/ 36 Ar ratios of 520 and 334, respectively. The isochron ages are interpreted to represent initial amphibolite-facies retrogression. The data points constituting the quartz age plateaux give an isochron age of 405 Ma with initial 40 Ar/ 36 Ar ratio of 295, recording a significant aqueous fluid flow episode during the early Devonian. Age spectra obtained by stepwise heating of amphibole residues remaining after crushing experiments are characterized by younger and relatively complex age spectra, which are probably influenced by the combined effects of resetting argon and/or mineral inclusions. Nevertheless, we note that the spectra shapes have features in common: excluding the last two steps, minimum apparent ages are found at temperatures of around 500 C, corresponding to 319 and 249 Ma, perhaps representing the time of isotopic resetting or resulting from release gas from mineral inclusions of, e.g., biotite or feldspar. Maximum apparent ages are obtained at temperatures of around 800 C, corresponding to 418 and 413 Ma, which probably reflect mixed ages of radiogenic resetting and original amphibole. These results indicate that the Yuka eclogites and their retrogressed equivalents were overprinted by multiple thermal events in the Silurian and possibly as young as the Triassic.Ó 2015, China University of Geosciences (Beijing) and Peking University. Production and hosting by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/ licenses/by-nc-nd/3.0/).

show abstract

U–Pb geochronology of paragneisses and metabasite in the Xitieshan area, north Qaidam Mountains, western China: Constraints on the exhumation of HP/UHP metamorphic rocks

Cited by 59 publications

References 57 publications

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

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

Ocorrência de rochas da fácies granulito no Cinturão Mineiro, Minas Gerais, Brasil

Retrograde metamorphism of the eclogite in North Qaidam, western China: Constraints by joint 40Ar/39Ar in vacuo crushing and stepped heating

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