Petrology, Geochemistry, Geochronology, and Metamorphic Evolution of Garnet Peridotites from South Altyn Tagh UHP Terrane, Northwestern China

Wang, Chao; Liu, Liang; Chen, Danling; Cao, Yuting

doi:10.1016/b978-0-12-385144-4.00016-3

Cited by 22 publications

(52 citation statements)

References 59 publications

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“…4b and c). Amphibole and talc inclusions have been recognized in garnet porphyroblasts in previous works (Liu et al, 2002;Wang et al, 2011), but have not been observed in our samples. Spinel inclusions are partially replaced to ilmenite or magnetite (Fig.…”

Section: Garnet Peridotitecontrasting

confidence: 73%

“…Previous geothermobarometric data suggest that the garnet peridotite experienced the peak P-T conditions of 19-27 kbar and 870-1050°C, followed by a medium pressure granulite-facies conditions related to retrogression or reheating, which is consistent with the metamorphic history of the host felsic granulites (Zhang et al, 2005a(Zhang et al, , 2014. At the same time, the garnet peridotite has been suggested to have experienced an ultra-high pressure metamorphic condition due to the reactions of magnesite and clinopyroxene and some exsolution features (Liu et al, 2002;Wang et al, 2011). The origin of the garnet peridotites and their relationship to the host felsic granulite remains controversial.…”

Section: Introductionmentioning

confidence: 77%

“…Previous zircon U-Pb geochronology yielded ages of 493 ± 7 Ma for the high pressure felsic granulite, 497 ± 11 Ma for the high pressure mafic granulite, and 501 ± 16 Ma for the garnet peridotite, which were interpreted together as the timing of the HP/HT granulite facies metamorphism (Zhang et al, 2005a(Zhang et al, , 2014. A similar metamorphic age (498 ± 3 Ma) was also obtained by the zircon U-Pb dating of garnet peridotite (Wang et al, 2011). Recently, the rutile U-Pb datings of the associated felsic granulites and mafic granulites suggested a ca.…”

Section: Introductionmentioning

confidence: 77%

“…450 Ma medium pressure granulite facies overprinting or reheating (Zhang et al, 2014). However, the protolith age of the garnet peridotite has not been well constrained, although the Neoproterozoic has been suggested based on the dating of a few zircon cores from the garnet peridotite (Wang et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

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Origin of Early Paleozoic garnet peridotite and associated garnet pyroxenite in the south Altyn Tagh, NW China: Constraints from geochemistry, SHRIMP U–Pb zircon dating and Hf isotopes

Zhang

et al. 2015

Journal of Asian Earth Sciences

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Section: Garnet Peridotitecontrasting

confidence: 73%

Section: Introductionmentioning

confidence: 77%

Section: Introductionmentioning

confidence: 77%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Origin of Early Paleozoic garnet peridotite and associated garnet pyroxenite in the south Altyn Tagh, NW China: Constraints from geochemistry, SHRIMP U–Pb zircon dating and Hf isotopes

Zhang

et al. 2015

Journal of Asian Earth Sciences

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“…In the recent decades, research on HP-UHP metamorphism has captured much attention and made important advancements on the continental subduction depth/polarity, subduction/collision time, metamorphic evolution, and subducted continental crust properties (Liu et al, 1997(Liu et al, , 1999(Liu et al, , 2005(Liu et al, , 2007a(Liu et al, , 2007bZhang et al, 2001Zhang et al, , 2002Zhang et al, , 2004Zhang et al, , 2005Cao et al, 2009;Wang et al, 2011). Previous studies have demonstrated that these HP-UHP metamorphic rocks are the products of deep continental subduction (Liu et al, 1997(Liu et al, , 2005Zhang et al, 2001Zhang et al, , 2002, and that they underwent an episode of UHP eclogite-facies metamorphism and two stages of retrograde metamorphism (HP granulite-facies and amphibolite-facies).…”

mentioning

confidence: 99%

Early Paleozoic granitic magmatism related to the processes from subduction to collision in South Altyn, NW China

Liu

Kang

Cao

et al. 2015

Sci. China Earth Sci.

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Four episodes of granitic rocks at 517, 501-496, 462-451, and 426-385 Ma occurred in the South Altyn subduction-collision complex. The first episode of granite emplacement predates the formation of the ophiolite type mafic rock (500 Ma), and the three subsequent episodes can be temporally correlated to high-pressure (HP) to ultrahigh-pressure (UHP) metamorphism at ca. 500 Ma, retrograde granulite-facies metamorphism at ca. 450 Ma, and amphibolite-facies metamorphism at ca. 420 Ma, respectively. A comprehensive study of these granitic rocks, along with the regional geological background, mafic-ultramafic rocks, and HP-UHP metamorphism, indicates that the four episodes of granitic magmatism are sequentially derived from the partial melting of the earlier subducted oceanic crust at 517 Ma, the thickened continental crust due to continental subduction at ca. 500 Ma, the mid-upper crust in response to slab breakoff at ca. 450 Ma, and the tectonic transition from contraction to extension at ca. 420 Ma. The formation age of 517 Ma for oceanic adakite provides a direct constraint on the time of the oceanic subduction in South Altyn. In addition, there is a ca. 10 Myr interval between the oceanic subduction to the continental deep subduction, suggesting that the Early Paleozoic tectonic evolution might have been a successive process in South Altyn. The four episodes of formation of granitic rocks, mafic-ultramafic rocks, and HP-UHP metamorphic rocks have fully recorded the tectonic evolution, beginning with the oceanic subduction, followed by continental subduction, and later exhumation during the Early Paleozoic in South Altyn. South Altyn, granitic magmatism, oceanic subduction, continental deep subduction, tectonic evolution Citation:Liu L, Kang L, Cao Y T, Yang W Q. 2015. Early Paleozoic granitic magmatism related to the processes from subduction to collision in South

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Petrogenesis of mafic granulite in South Altyn Tagh, NW China: Constraints from petrology, zircon U–Pb chronology, and geochemistry

Zhang

et al. 2019

Geological Journal

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Mafic granulite, garnet peridotite, and garnet pyroxenite occurred as slices or lenses within dominant felsic granulite, and they together constitute a high‐pressure metamorphic terrane in the Bashiwake unit, South Altyn Tagh, Northern Tibet, China. Previous studies focused on the metamorphic evolution, and geothermobarometry results indicated that the mafic granulite has experienced high pressure/(ultra‐)high temperature (HP/(U)HT) metamorphism, followed by a medium pressure (MP) granulite‐facies overprint. However, the nature and petrogenesis of the mafic granulite in the dominant felsic granulite are poorly known. Combining the previous geothermobarometry results with the petrographic observations, mineral chemistry, and pseudosection modelling in this study, at least four stages were suggested for the metamorphic evolution of the mafic granulites in the South Altyn Tagh, including the eclogite‐facies stage (3–4 GPa, 910–1000°C), high pressure–ultrahigh temperature (HP–UHT) metamorphism, an isothermal decompression, and subsequent MP granulite‐facies overprint. The U–Pb dating of zircons yielded two age clusters: one age cluster at ca. 500 Ma, representing the retrograde age of HP–UHT metamorphism after the eclogite‐facies stage, and another age cluster of ca. 900 Ma that represented the age of the protolith for the mafic granulite. This indicated that the protolith of the mafic granulite was formed in the early Neoproterozoic and then was taken to extreme temperatures and pressures during the early Palaeozoic orogenic event. The elemental abundances of the mafic granulites in the Bashiwake area clearly indicated that they were higher in FeO and TiO2, but were significantly lower in MgO, Cr, and Ni than those of associated garnet peridotites/pyroxenites, and they showed LREE‐enriched patterns with slightly positive Eu anomalies. Sr–Nd isotopic data suggested a basaltic magmatic origin with crust contamination for the protolith of the mafic granulite. Integrating these results together with previous studies, we suggest that the mafic granulites were derived from the basaltic magma intrusion in the continental crust during the Neoproterozoic and subsequently suffered a common HP/UHT metamorphism with felsic crust rocks in the early Palaeozoic (ca. 500 Ma) after the eclogite‐facies metamorphism related to the continental collision (>500 Ma).

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Petrology, Geochemistry, Geochronology, and Metamorphic Evolution of Garnet Peridotites from South Altyn Tagh UHP Terrane, Northwestern China

Cited by 22 publications

References 59 publications

Origin of Early Paleozoic garnet peridotite and associated garnet pyroxenite in the south Altyn Tagh, NW China: Constraints from geochemistry, SHRIMP U–Pb zircon dating and Hf isotopes

Origin of Early Paleozoic garnet peridotite and associated garnet pyroxenite in the south Altyn Tagh, NW China: Constraints from geochemistry, SHRIMP U–Pb zircon dating and Hf isotopes

Early Paleozoic granitic magmatism related to the processes from subduction to collision in South Altyn, NW China

Petrogenesis of mafic granulite in South Altyn Tagh, NW China: Constraints from petrology, zircon U–Pb chronology, and geochemistry

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