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| REE and Sr-Nd isotope characteristics of hydrothermal chimney at Jade area in the Okinawa Trough | |
| 作者姓名： | LIU Yanguang MENG Xianwei FU Yunxia |
| 作者单位： | [1]KeyLaboratoryofMarineSedimentologyandEnvironmentGeologyofStateOceanicAdministration,Qingdao266061,China [2]GeologicalResourceandGeotechnicalEngineeringCooperationofQingdao,Qingdao266071,China |
| 摘 要： | Hydrothermal chimney is a product of hydrothermal activity on the seabed. Chimney samples dredged from Jade hydrothermal area in Izena depression of the Okinawa Trough, are characterized by relatively enriched light rare earth elements (LREE) and strongly positive Eu anomalies. ^87Sr/^86Sr and ^143Nd/^144Nd of these samples are exactly between those of seawater and of acidic pumice, averaged at 0.708928 and 0.512292, respectively. These characteristics imply that the main source of hydrothermal sulfide at Jade area is possibly the undersurface acidic rocks. The mineralizing mechanism can be summarized as follows: Large amount of mineralized material would be leached out and LREE-enriched hydrothermal solution would be subsequently produced as a result of thermo-chemical exchange reaction between acidic volcanic rocks and heated seawater that penetrated in advance from upper water mass. The spurting out from the seabed and quickly crystallizing in the seawater of hydrothermal solution are responsible for the formation of Cu-Zn sulfide and barite-amorphous SiO2 minerals that are characterized by enriched LREE and positively strong Eu anomalies. |
| 关 键 词： | 稀土元素氧化物 锶 钕 同位素 冲绳 |
| 收稿时间： | 2003/12/11 0:00:00 |
| 修稿时间： | 2004/1/20 0:00:00 |
REE and Sr-Nd isotope characteristics of hydrothermal chimney at Jade area in the Okinawa Trough |
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| LIU Yanguang,MENG Xianwei,FU Yunxia.REE and Sr-Nd isotope characteristics of hydrothermal chimney at Jade area in the Okinawa Trough[J].Acta Oceanologica Sinica,2004,23(2):287-296. | |
| Authors: | LIU Yanguang MENG Xianwei and FU Yunxia |
| Institution: | 1. Key Laboratory of Marine Sedimentology and Environment Geology of State Oceanic Administration,Qingdao 266061 ,China;First Institute of Oceanography,State Oceanic Administration,Qingdao 266061,China;The College of Marine Geosciences,Ocean University of Ch 2. Key Laboratory of Marine Sedimentology and Environment Geology of State Oceanic Administration,Qingdao 266061 ,China;First Institute of Oceanography,State Oceanic Administration,Qingdao 266061,China 3. Geological Resource and Geotechnical Engineering Cooperation of Qingdao,Qingdao 266071,China |
| Abstract: | Hydrothermal chimney is a product of hydrothermal activity on the seabed. Chimney samples dredged from Jade hydrothermal area in Izena depression of the Okinawa Trough, are characterized by relatively enriched light rare earth elements (LREE) and strongly positive Eu anomalies. 87Sr/86Sr and 143Nd/144Nd of these samples are exactly between those of seawater and of acidic pumice, averaged at 0.708928 and 0.512292, respectively. These characteristics imply that the main source of hydrothermal sulfide at Jade area is possibly the undersurface acidic rocks. The mineralizing mechanism can be summarized as follows: Large amount of mineralized material would be leached out and LREE-enriched hydrothermal solution would be subsequently produced as a result of thermo-chemical exchange reaction between acidic volcanic rocks and heated seawater that penetrated in advance from upper water mass. The spurting out from the seabed and quickly crystallizing in the seawater of hydrothermal solution are responsible for the formation of Cu-Zn sulfide and barite-amorphous SiO2 minerals that are characterized by enriched LREE and positively strong Eu anomalies. |
| Keywords: | hydrothermal chimney rare earth elements Sr and Nd isotopes |
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