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, (2): 62-69. doi: 10.1007/s13131-012-0192-1
Citation:
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, (2): 62-69. doi: 10.1007/s13131-012-0192-1
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, (2): 62-69. doi: 10.1007/s13131-012-0192-1
Citation:
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, (2): 62-69. doi: 10.1007/s13131-012-0192-1
Key Laboratory of Submarine Geosciences and Technology, Ministry of Education, Department of Marine Geoscience, Ocean University of China, Qingdao 266100, China
2.
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
3.
Laboratory of Submarine GeoScience, Second Institute Oceanography, State Oceanic Administration, Hangzhou 310012, China
4.
Key Laboratory of Marine Hydrocaobon Resources and Environment Geology MLR, Qingdao Institute of Marine Geology, Qingdao 266071, China
5.
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
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.
DownLoad: