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Os Isotopic Compositions of Seafloor Massive Sulfide from the TAG Hydrothermal Field in the Mid-Atlantic Ridge

ZENG Zhi-gang 1 ZHAI Shi-kui 2 DU An-dao 3 1(Institute of Oceanology,Chinese Academy of Sciences,Qingdao Shandong 266071) 2(College of Marine Geosciences,Ocean University of Qingdao,Qingdao Shandong 266003) 3(Institute of Rock and Mineral Anal  
New data on osmium isotopic compositions of four seafloor massive sulfide samples from the TAG hydrothermal field has been got, the 187 Os/ 186Os ratios of massive sulfide samples vary from 2.305 to 7.879, with a mean of 5.986, these ratios are between that of modern seawater and upper oceanic crust, and this range of Os isotopic compositions is likely the result of mixing of seawater with upper oceanic crust, maybe about 56% of osmium in the massive sulfides is from the seawater, and 44% is from the upper oceanic crust. The mixing of seawater with hydrothermal fluid have an obvious effect on the Os concentration and isotope composition of massive sulfide during the seafloor hydrothermal activity.
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