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Titolo:
Carbon isotope composition of carbon dioxide in fluid inclusions from peridotite xenoliths and eclogites in East China.
Autore:
Yang, XY; Zheng, YF; Liu, DL; Tao, SZ; Dai, JX;
Indirizzi:
Univ Sci & Technol China, Dept Earth & Space Sci, Hefei 230026, Peoples R China Univ Sci & Technol China Hefei Peoples R China 230026 6, Peoples R China Res Inst Petr Explorat & Dev, Div Nat Gas, Beijing 100083, Peoples R ChinaRes Inst Petr Explorat & Dev Beijing Peoples R China 100083 ples R China
Titolo Testata:
ACTA PETROLOGICA SINICA
fascicolo: 4, volume: 16, anno: 2000,
pagine: 473 - 481
SICI:
1000-0569(200011)16:4<473:CICOCD>2.0.ZU;2-6
Fonte:
ISI
Lingua:
CHI
Soggetto:
CONTINENTAL-CRUST; MANTLE; SYSTEMATICS; BEARING; GLASSES; HOTSPOT;
Keywords:
peridotite; eclogite; fluid inclusions; carbon dioxide; carbon isotope; plate subduction; geodynamics; East China;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
40
Recensione:
Indirizzi per estratti:
Indirizzo: Yang, XY Univ Sci & Technol China, Dept Earth & Space Sci, Hefei 230026, Peoples R China Univ Sci & Technol China Hefei Peoples R China 230026 s R China
Citazione:
X.Y. Yang et al., "Carbon isotope composition of carbon dioxide in fluid inclusions from peridotite xenoliths and eclogites in East China.", ACTA PETR S, 16(4), 2000, pp. 473-481

Abstract

The carbon isotope composition of carbon dioxide in fluid inclusions was analysized by step-heating technique for peridotite xenoliths enclosed by Cenozoic basalts in East China and for eclogites in the Dabie Mountains. The results show a large delta C-13 variation from -22.8 to +0.7 parts per thousand for the peridotite, being different from the uniformly low delta C-13 values of -28 to - 20% reported previously for Cenozoic basalts and enclosed peridotite xenoliths in East China. This indicates carbon isotope heterogeneity in CO2 from the mantle fluid in East China. The higher delta C-13 values may be probably responsible for the primary mantle carbon remained in the mantle-derived rocks, whereas the lower delta C-13 values suggest that the lithospheric mantle in East China contains abundant crustal organic carbon. The eclogites from the Dabie Mountains also exhibit a large delta C-13variation from -18.5 to +4.6 parts per thousand, being different from the uniformly low delta C-13 values of -30 to -20 parts per thousand reported previously for ultrahigh pressure metamorphic rocks in East Dabie and West Sulu. While the lower delta C-13 values for the eclogites are responsible for hydrothermal alteration to the eclogite protoliths by C-13-depleted surface fluids prior to plate subduction, the higher delta C-13 values greater than - 3 parts per thousand observed in this study indicate the overprintingof C-13-enriched and CO2-rich fluid derived from leaching marbles subsequent to the ultrahigh pressure metamorphism. A geodynamic model is proposed to accound for the geochemical recycling of carbon in the processes of platesubduction and prograde metamorphism as well as plate break-off and uplift. It appears that the C-13-depleted slab may be broken off in mantle depthsand underwent either partial melting to generate mafic magmas or metasomatize the mantle to produce peridotitic melts with crustal isotopic signature. This provides a genetic link between C-13-depleted basalts , enclosed peridotites and eclogites.

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Documento generato il 30/03/20 alle ore 19:09:23