MINERAL CHEMISTRY OF PERIDOTITES FROM PALEOZOIC, MESOZOIC AND CENOZOIC LITHOSPHERE: CONSTRAINTS ON MANTLE EVOLUTION BENEATH EASTERN CHINA

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dc.contributor.author Zheng J.
dc.contributor.author Griffin W.L.
dc.contributor.author Oreilly S.Y.
dc.contributor.author Yang J.
dc.contributor.author Li T.
dc.contributor.author Zhang M.
dc.contributor.author Zhang R.Y.
dc.contributor.author Liou J.G.
dc.date.accessioned 2024-08-03T06:10:52Z
dc.date.available 2024-08-03T06:10:52Z
dc.date.issued 2006
dc.identifier https://elibrary.ru/item.asp?id=10499915
dc.identifier.citation Journal of Petrology, 2006, 47, 11, 2233
dc.identifier.issn 0022-3530
dc.identifier.uri https://repository.geologyscience.ru/handle/123456789/44602
dc.description.abstract Major- and trace-element data on the constituent minerals of garnet peridotite xenoliths hosted in early Paleozoic (457–500?Ma) kimberlites and Neogene (16–18?Ma) volcanic rocks within the North China Craton are compared with those from the pre-pilot hole of the Chinese Continental Scientific Drilling Project (CCSD-PP1) in the tectonically exhumed Triassic (?220?Ma) Sulu ultrahigh-pressure (UHP) terrane along its southern margin. P–T estimates for the Paleozoic and Neogene peridotite xenoliths reflect different model geotherms corresponding to surface heat flows of ?40?mW/m2 (Paleozoic) and ?80?mW/m2 (Neogene). Garnet peridotite xenoliths or xenocrysts from the Paleozoic kimberlites are strongly depleted, similar to peridotites from other areas of cratonic mantle, with magnesium olivine (mean Fo92.7), Cr-rich garnet and clinopyroxene with high La/Yb. Garnet (and spinel) peridotite xenoliths hosted in Neogene basalts are derived from fertile mantle; they have high Al2O3 and TiO2 contents, low-Mg-number olivine (mean Fo89.5), low-Cr garnet and diopside with flat rare earth element (REE) patterns. The differences between the Paleozoic and Neogene xenoliths suggest that a buoyant refractory lithospheric keel present beneath the eastern North China Craton in Paleozoic times was at least partly replaced by younger, hotter and more fertile lithospheric mantle during Mesozoic–Cenozoic times. Garnet peridotites from the Sulu UHP terrane have less magnesian olivine (Fo91.5), and lower-Cr garnet than the Paleozoic xenoliths. The diopsides have low heavy REE (HREE) contents and sinusoidal to light REE (LREE)-enriched REE patterns. These features, and their high Mg/Si and low CaO and Al2O3 contents, indicate that the CCSD-PP1 peridotites represent a moderately refractory mantle protolith. Details of mineral chemistry indicate that this protolith experienced complex metasomatism by asthenosphere-derived melts or fluids in Mesoproterozoic, and subsolidus re-equilibration involving fluids/melts derived from the subducted Yangtze continental crust during UHP metamorphism in the early Mesozoic. Tectonic extension of the subcontinental lithospheric mantle of the North China Craton and exhumation of the Sulu UHP rocks in the early Mesozoic induced upwelling of the asthenosphere. Peridotites sampled by the Neogene basalts represent newly formed lithosphere derived by cooling of the upwelling asthenospheric mantle in Jurassic–Cretaceous and Paleogene time.
dc.subject garnet peridotite xenoliths
dc.subject North China Craton
dc.subject thospheric thinning
dc.subject Sulu UHP terrane
dc.subject UHP lithosphere evolution
dc.subject mantle replacement
dc.title MINERAL CHEMISTRY OF PERIDOTITES FROM PALEOZOIC, MESOZOIC AND CENOZOIC LITHOSPHERE: CONSTRAINTS ON MANTLE EVOLUTION BENEATH EASTERN CHINA
dc.type Статья
dc.subject.age Кайнозой::Неоген
dc.subject.age Кайнозой::Палеоген
dc.subject.age Мезозой::Меловая
dc.subject.age Мезозой::Юрская
dc.subject.age Мезозой::Триасовая
dc.subject.age Докембрий::Протерозой::Мезопротерозойская
dc.subject.age Cenozoic::Neogene
dc.subject.age Cenozoic::Paleogene
dc.subject.age Mesozoic::Cretaceous
dc.subject.age Mesozoic::Jurassic
dc.subject.age Mesozoic::Triassic
dc.subject.age Precambrian::Proterozoic::Mesoproterozoic


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