| Rare earth element geochemistry of hydrothermal deposits from Southwest Indian Ridge |
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| 作者姓名： | CAO Zhimin CAO Hong TAO Chunhui LI Jun YU Zenghui SHU Liping |
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| 作者单位： | Key Laboratory of Submarine Geosciences and Technology, Ministry of Education, Department of Marine Geoscience, Ocean University of China, Qingdao 266100, China,Key Laboratory of Submarine Geosciences and Technology, Ministry of Education, Department of Marine Geoscience, Ocean University of China, Qingdao 266100, China;Key Laboratory of Marine Hydrocaobon Resources and Environment Geology MLR, Qingdao Institute of Marine Geology, Qingdao 266071, China,Laboratory of Submarine GeoScience, Second Institute Oceanography, State Oceanic Administration, Hangzhou 310012, China,Key Laboratory of Marine Hydrocaobon Resources and Environment Geology MLR, Qingdao Institute of Marine Geology, Qingdao 266071, China,Key Laboratory of Submarine Geosciences and Technology, Ministry of Education, Department of Marine Geoscience, Ocean University of China, Qingdao 266100, China,Key Laboratory of Submarine Geosciences and Technology, Ministry of Education, Department of Marine Geoscience, Ocean University of China, Qingdao 266100, China;Petrology of the Oceanic Crust, Geosciences Department, University of Bremen, Bremen 28359, Germany |
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| 基金项目： | Foundation item： The National Natural Science Foundation of China under contract No. 40872063.Acknowledgements The authors appreciate the assistance of China Ocean Samples Repository and Prof. Zhai Shikui in providing valuable samples for this experiments, and also grateful to engineer Zhang Aibin from ＂element and isotope analysis laboratory＂, Marine Geosciences, Ocean University of China, for his valuable advice and selfless help for this experiment. |
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| 摘 要： | The REE compositions of hydrothermal deposits and basalt samples from the Southwest Indian Ridge (SWIR) were determined with ICP-MS.The results show that there are significant differences between different types of samples although all samples show relative LREE enrichment.The contents of REE in hydrothermal sulfides and alterated rocks samples are lower (from 7.036 × 10 6 to 23.660 × 10 6),while those in the white chimney deposits are relatively higher (ranging from 84.496 × 10 6 to 103.511 × 10 6).Both of them are lower than basalts.Chondrite-normalized REE distribution patterns show that sulfides and alterated rocks samples are characterized by significant positive Eu anomalies.On the contrary,white chimney deposits have obvious negative Eu anomalies,which may be caused by abundant calcite existing in the white chimney samples.Both the content and distribution pattern of REE in sulfides suggest that REE most possibly is originally derived from hydrothermal fluids,but influenced by the submarine reducing ore-forming environment,seawater convection,mineral compositions as well as the constraint of mineral crystallizations.
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| 关 键 词： | 稀土元素 热液矿床 元素地球化学 洋中脊 印度 西南 热液硫化物 ICP-MS |
| 收稿时间： | 5/6/2011 12:00:00 AM |
| 修稿时间： | 2011/10/20 0:00:00 |
Rare earth element geochemistry of hydrothermal deposits from Southwest Indian Ridge |
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| CAO Zhimin,CAO Hong,TAO Chunhui,LI Jun,YU Zenghui,SHU Liping.Rare earth element geochemistry of hydrothermal deposits from Southwest Indian Ridge[J].Acta Oceanologica Sinica,2012,31(2):62-69. |
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| Authors: | CAO Zhimin CAO Hong TAO Chunhui LI Jun YU Zenghui and SHU Liping |
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| Institution: | Key Laboratory of Submarine Geosciences and Technology, Ministry of Education, Department of Marine Geoscience, Ocean University of China, Qingdao 266100, China;Key Laboratory of Submarine Geosciences and Technology, Ministry of Education, Department of Marine Geoscience, Ocean University of China, Qingdao 266100, China;Key Laboratory of Marine Hydrocaobon Resources and Environment Geology MLR, Qingdao Institute of Marine Geology, Qingdao 266071, China;Laboratory of Submarine GeoScience, Second Institute Oceanography, State Oceanic Administration, Hangzhou 310012, China;Key Laboratory of Marine Hydrocaobon Resources and Environment Geology MLR, Qingdao Institute of Marine Geology, Qingdao 266071, China;Key Laboratory of Submarine Geosciences and Technology, Ministry of Education, Department of Marine Geoscience, Ocean University of China, Qingdao 266100, China;Key Laboratory of Submarine Geosciences and Technology, Ministry of Education, Department of Marine Geoscience, Ocean University of China, Qingdao 266100, China;Petrology of the Oceanic Crust, Geosciences Department, University of Bremen, Bremen 28359, Germany |
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| Abstract: | The REE compositions of hydrothermal deposits and basalt samples from the Southwest Indian Ridge (SWIR) were determined with ICP-MS. The results show that there are significant differences between different types of samples although all samples show relative LREE enrichment. The contents of REE in hydrothermal sulfides and alterated rocks samples are lower (from 7.036×10-6 to 23.660×10-6), while those in the white chimney deposits are relatively higher (ranging from 84.496×10-6 to 103.511×10-6). Both of them are lower than basalts. Chondrite-normalized REE distribution patterns show that sulfides and alterated rocks samples are characterized by significant positive Eu anomalies. On the contrary, white chimney deposits have obvious negative Eu anomalies, which may be caused by abundant calcite existing in the white chimney samples. Both the content and distribution pattern of REE in sulfides suggest that REE most possibly is originally derived from hydrothermal fluids, but influenced by the submarine reducing ore-forming environment, seawater convection, mineral compositions as well as the constraint of mineral crystallizations. |
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| Keywords: | rare earth element hydrothermal deposits Southwest Indian Ridge |
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