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Titolo:
Chemical and carbon isotope compositions of fluid inclusions in peridotitexenoliths and eclogites from eastern China: Geodynamic implications
Autore:
Yang, XY; Zheng, YF; Liu, D; Dai, J;
Indirizzi:
Univ Sci & Technol China, Dept Earth & Space Sci, Lab Chem Geodynam, Hefei230026, Peoples R China Univ Sci & Technol China Hefei Peoples R China 230026 6, Peoples R China Gen Co China Petr & Nat Gas, Beijing Inst Petr Explorat & Dev, Beijing 100083, Peoples R China Gen Co China Petr & Nat Gas Beijing Peoples R China 100083 oples R China
Titolo Testata:
PHYSICS AND CHEMISTRY OF THE EARTH PART A-SOLID EARTH AND GEODESY
fascicolo: 9-10, volume: 26, anno: 2001,
pagine: 705 - 718
SICI:
1464-1895(2001)26:9-10<705:CACICO>2.0.ZU;2-N
Fonte:
ISI
Lingua:
ENG
Soggetto:
PRESSURE METAMORPHIC ROCKS; COESITE-BEARING ECLOGITE; CENOZOIC VOLCANIC-ROCKS; DABIE-SHAN; UPPER-MANTLE; CONTINENTAL-CRUST; COUNTRY ROCKS; SUBCONTINENTAL MANTLE; BASALTIC GLASSES; SUBDUCTION ZONES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
105
Recensione:
Indirizzi per estratti:
Indirizzo: Zheng, YF Univ Sci & Technol China, Dept Earth & Space Sci, Lab Chem Geodynam, Hefei230026, Peoples R China Univ Sci & Technol China Hefei Peoples R China 230026 R China
Citazione:
X.Y. Yang et al., "Chemical and carbon isotope compositions of fluid inclusions in peridotitexenoliths and eclogites from eastern China: Geodynamic implications", PHYS CH P A, 26(9-10), 2001, pp. 705-718

Abstract

Chemical and carbon isotope compositions of fluid inclusions were measuredfor peridotite xenoliths enclosed in Cenozoic basalts and Triassic ultrahigh pressure eclogites from the Dabie terrane in eastern China to provide insight into the nature of their related fluids. The results show that the inclusions contain different amounts of gaseous CO2, N-2, H2S, CO, CH4 and H-2, some of which have significant amounts of H-2. This may reflect chemicalheterogeneity in mantle fluids of eastern China and possible metasomatism to the mantle-derived rocks during their eruption and exhumation to surface. There is a variation in delta C-13 from -25.1 to 0.7 parts per thousand for the fluid inclusions in the peridotite xenoliths. Although the higher delta C-13 values may be either derived from decarbonation of sedimentary carbonates or responsible for the primary mantle carbon remained in the mantle-derived rocks, the lower delta C-13 values below -15 parts per thousand suggest the incorporation of organic carbon by plate subduction into the continental lithospheric mantle in eastern China. The fluid inclusions in the eclogites from the Dabie terrane also exhibit a large delta C-13 variation from -18.5 to 4.6 parts per thousand, similar to previously reported 5 13C features measured for bulk carbon in eclogitesfrom the Dabie-Sulu terranes. While the low delta C-13 values result from hydrothermal alteration to the eclogite protoliths by C-13-depleted surfacefluid before plate subduction, the high delta C-13 values indicate overprinting of C-13-rich CO2-bearing fluid derived from leaching marble lithologies subsequent to the ultrahigh pressure metamorphism. A geodynamic model isproposed to account for the geochemical. recycling of carbon in the processes of plate subduction and prograde metamorphism as well as plate break-off and exhumation. It appears that the C-13-depleted slab may be broken off at mantle depths and undergone partial melting to generate basaltic magma and peridotite melt. This provides a genetic links between the C-13-depletedperidotites and eclogites. (C) 2001 Elsevier Science Ltd. All rights reserved.

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Documento generato il 04/04/20 alle ore 02:48:24