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Article: Carbon concentrations and isotopic ratios of eclogites from the Dabie and Sulu terranes in China

TitleCarbon concentrations and isotopic ratios of eclogites from the Dabie and Sulu terranes in China
Authors
KeywordsApatite
Carbon Isotope
Carbonate
Dabie-Sulu Terranes
Eclogite
Organic Carbon
Issue Date2000
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/chemgeo
Citation
Chemical Geology, 2000, v. 168 n. 3-4, p. 291-305 How to Cite?
AbstractBoth concentration and isotope composition of bulk carbon in apatite and host eclogites from the Dabie-Sulu ultrahigh pressure (UHP) terranes in China have been determined along with their oxygen isotope composition. The results show significant 13C-depletion in the apatite (δ 13C = -27.7‰ to -20.8‰) with the carbon concentrations of 0.59 to 1.65 wt.% CO 2 despite a large variation in δ 18O (-6.5‰ to +9.5‰). The bulk carbon in 21 of the 24 eclogites has low δ 13C values of -26.1‰ to -17.9‰ with low carbon content of 500 to 1000 ppm, whereas the other three samples show high δ 13C values of -7.1‰ to -2.8‰ with high carbon contents of 2400 to 4300 ppm. Noncarbonate carbon was measured by treating the all eclogites with 5 N HCl solution, yielding uniformly low δ 13C values of -27.9‰ to -24.2‰ and carbon contents of 200 to 300 ppm. Carbonate carbon is thus calculated by mass balance to have also low δ 13C values of -25.6‰ to -15.1‰ for the 21 samples but high δ 13C values of -4.3‰ to -1.2‰ for the remaining three samples. Secondary carbonate was identified in the three eclogites that are also depleted in 13C primarily, but subjected to overprint of 13C-rich CO 2-bearing fluid subsequent to the UHP metamorphism. The isotopically light carbon in both eclogite and apatite is interpreted to represent the isotope composition of carbon in eclogite precursors before plate subduction, and thus has an origin of organic carbon from the Earth's surface. The uniformly low δ 13C values of apatite suggest that the CO 2 of metamorphic fluid in equilibrium with the host-eclogites would be derived from the oxidation of organic carbon rather than the decarbonation of underthrust carbonates during progressive metamorphism. Protoliths of the eclogites are inferred to be of igneous origin, which underwent more extensive interaction with organic matter than with meteoric-hydrothermal fluid on the subsurface of the continental crust. The break off of the subducted plate containing the isotopically light carbon and subsequent interactions with the surrounding mantle could produce the mafic and/or silicic magmas that are significantly depleted in 13C relative to the primary mantle carbon. This may provide evidence for a linkage of the 13C-depleted mantle carbon to a surficial source via plate subduction. (C) 2000 Elsevier Science B.V. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/151035
ISSN
2015 Impact Factor: 3.482
2015 SCImago Journal Rankings: 2.346
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorZheng, YFen_US
dc.contributor.authorGong, Ben_US
dc.contributor.authorLi, Yen_US
dc.contributor.authorWang, Zen_US
dc.contributor.authorFu, Ben_US
dc.date.accessioned2012-06-26T06:16:22Z-
dc.date.available2012-06-26T06:16:22Z-
dc.date.issued2000en_US
dc.identifier.citationChemical Geology, 2000, v. 168 n. 3-4, p. 291-305en_US
dc.identifier.issn0009-2541en_US
dc.identifier.urihttp://hdl.handle.net/10722/151035-
dc.description.abstractBoth concentration and isotope composition of bulk carbon in apatite and host eclogites from the Dabie-Sulu ultrahigh pressure (UHP) terranes in China have been determined along with their oxygen isotope composition. The results show significant 13C-depletion in the apatite (δ 13C = -27.7‰ to -20.8‰) with the carbon concentrations of 0.59 to 1.65 wt.% CO 2 despite a large variation in δ 18O (-6.5‰ to +9.5‰). The bulk carbon in 21 of the 24 eclogites has low δ 13C values of -26.1‰ to -17.9‰ with low carbon content of 500 to 1000 ppm, whereas the other three samples show high δ 13C values of -7.1‰ to -2.8‰ with high carbon contents of 2400 to 4300 ppm. Noncarbonate carbon was measured by treating the all eclogites with 5 N HCl solution, yielding uniformly low δ 13C values of -27.9‰ to -24.2‰ and carbon contents of 200 to 300 ppm. Carbonate carbon is thus calculated by mass balance to have also low δ 13C values of -25.6‰ to -15.1‰ for the 21 samples but high δ 13C values of -4.3‰ to -1.2‰ for the remaining three samples. Secondary carbonate was identified in the three eclogites that are also depleted in 13C primarily, but subjected to overprint of 13C-rich CO 2-bearing fluid subsequent to the UHP metamorphism. The isotopically light carbon in both eclogite and apatite is interpreted to represent the isotope composition of carbon in eclogite precursors before plate subduction, and thus has an origin of organic carbon from the Earth's surface. The uniformly low δ 13C values of apatite suggest that the CO 2 of metamorphic fluid in equilibrium with the host-eclogites would be derived from the oxidation of organic carbon rather than the decarbonation of underthrust carbonates during progressive metamorphism. Protoliths of the eclogites are inferred to be of igneous origin, which underwent more extensive interaction with organic matter than with meteoric-hydrothermal fluid on the subsurface of the continental crust. The break off of the subducted plate containing the isotopically light carbon and subsequent interactions with the surrounding mantle could produce the mafic and/or silicic magmas that are significantly depleted in 13C relative to the primary mantle carbon. This may provide evidence for a linkage of the 13C-depleted mantle carbon to a surficial source via plate subduction. (C) 2000 Elsevier Science B.V. All rights reserved.en_US
dc.languageengen_US
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/chemgeoen_US
dc.relation.ispartofChemical Geologyen_US
dc.subjectApatiteen_US
dc.subjectCarbon Isotopeen_US
dc.subjectCarbonateen_US
dc.subjectDabie-Sulu Terranesen_US
dc.subjectEclogiteen_US
dc.subjectOrganic Carbonen_US
dc.titleCarbon concentrations and isotopic ratios of eclogites from the Dabie and Sulu terranes in Chinaen_US
dc.typeArticleen_US
dc.identifier.emailLi, Y:yiliang@hkucc.hku.hken_US
dc.identifier.authorityLi, Y=rp01354en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1016/S0009-2541(00)00199-6en_US
dc.identifier.scopuseid_2-s2.0-0033922202en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0033922202&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume168en_US
dc.identifier.issue3-4en_US
dc.identifier.spage291en_US
dc.identifier.epage305en_US
dc.identifier.isiWOS:000087608000010-
dc.publisher.placeNetherlandsen_US
dc.identifier.scopusauthoridZheng, YF=24333612100en_US
dc.identifier.scopusauthoridGong, B=7102144191en_US
dc.identifier.scopusauthoridLi, Y=27171876700en_US
dc.identifier.scopusauthoridWang, Z=35308218100en_US
dc.identifier.scopusauthoridFu, B=35960736900en_US

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