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《Geochimica》 1998-01
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HYDROGEN AND OXYGEN ISOTOPE GEOCHEMISTRY OF ECLOGITES FROM THE DONGHAI DISTRICT IN THE Su-Lu TERRANE

Fu Bin; Zheng Yongfei; Gong Bing; Li Yiliang; Li Shuguang(Department of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026)  
The oxygen and hydrogen isotope compositions of minerals from ultrahighpressure (UHP) eclogites and associated quartz-schist from the Donghai district in thewestern part of the Su-Lu terrane, East China have been determined. The resultsshow a large variation in δ~(18)O value (-10.4‰ to + 4.8‰ for omphacite and garnet)but a small range in δD value (-104‰ to - 83‰ and - 66‰ to - 49‰ forphengite and zoisite, respectively). Oxygen isotope equilibrium has been achieved andpreserved between different mineral pairs, yielding concordant isotope temperatures of650℃ to 750℃.The unusual δ~(18)O values as low as - 10‰ for the eclogite indicate that the rockexchanged oxygen isotopes with an extremely ~(18)O-depleted fluid. The low δD valuespreclude the involvement of seawater. It is likely that the eclogite equllibratedisotopically with meteoric water prior to eclogite-facies metamorphism and preservesthe premetamorphic isotopic signature. Thus, the eclogite precursor is a type ofbasaltic rocks on the continental crust which would have been altered by hydrothermalfluid of meteoric water origin. This indicates a crustal recycling process by platesubduction into the mantle in the suture zone of a continent-continent collision.Because silicate minerals would undergo rapid oxygen isotope exchangeby diffusion and recrystallization at mantle pressures and temperatures, the preservationof meteoric water signature in the ultrahigh pressure eclogite implies very limitedcrust-mantle interaction and thus a very short residence time for the plate containingthe eclogite precursor at mantle depths. The consistency of oxygen isotopetemperatures for different mineral pairs suggests a rapid cooling and ascent processsubsequent to the formation of the UHP eclogite at the mantle depths.
【Fund】: 国家自然科学基金!49453003;;中国科学院专项基金
【CateGory Index】: P597
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