| 大西洋洋中脊TAG热液区中块状硫化物的Os同位素研究 |
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| 引用本文： | 曾志刚,翟世奎,杜安道.大西洋洋中脊TAG热液区中块状硫化物的Os同位素研究[J].沉积学报,2002,20(3):394-398. |
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| 作者姓名： | 曾志刚 翟世奎 杜安道 |
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| 作者单位： | 1 中国科学院海洋研究所,山东青岛,266071; |
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| 基金项目： | 国家大洋专项基金，国家自然科学基金，DY105-01-03-1，40176020，， |
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| 摘 要： | 新测得TAG热液区中5件海底块状硫化物样品的锇含量及其同位素组成,187Os/186Os比值在2.305～7.879之间,均值为5.986,介于现代海水和上部洋壳岩石的锇同位素组成之间,表明该区海底块状硫化物中锇是海水和上部洋壳来源锇混合的产物.在海底热液循环过程中,海水的混入对该区热液流体的Os浓度及其同位素组成产生了明显的影响。
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| 关 键 词： | Os同位素 海底块状硫化物 TAG热液区 |
| 文章编号： | 1000-0550(2002)03-0394-06 |
| 收稿时间： | 2002-01-19 |
| 修稿时间： | 2002年1月19日 |
Os Isotopic Compositions of Seafloor Massive Sulfide from the TAG Hydrothermal Field in the Mid-Atlantic Ridge |
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| ZENG Zhi-gang,ZHAI Shi-kui,DU An-dao.Os Isotopic Compositions of Seafloor Massive Sulfide from the TAG Hydrothermal Field in the Mid-Atlantic Ridge[J].Acta Sedimentologica Sinica,2002,20(3):394-398. |
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| Authors: | ZENG Zhi-gang ZHAI Shi-kui DU An-dao |
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| Institution: | 1 Institute of Oceanology,Chinese Academy of Sciences,Qingdao Shandong 266071;2 College of Marine Geosciences,Ocean University of Qingdao,Qingdao Shandong,266003 |
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| Abstract: | 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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| Keywords: | Os isotope seafloor massive sulfide TAG hydrothermal field |
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