| CHEN Shuai,WANG Xiaoyuan,YIN Xuebo,ZHANG Guoliang. 2013. Genesis of anhydrite in hydrothermally altered basalt from the East Pacific Rise near 13°N. Acta Oceanologica Sinica, 32(2):12－17 |
| Genesis of anhydrite in hydrothermally altered basalt from the East Pacific Rise near 13°N |
| Genesis of anhydrite in hydrothermally altered basalt from the East Pacific Rise near 13°N |
| Received:July 08, 2011 Revised:March 13, 2012 |
| DOI：10.1007/s13131-013-0270-z |
| Key words:anhydrite hydrothermal alteration pillow basalt East Pacific Rise 13°N |
| 中文关键词: anhydrite hydrothermal alteration pillow basalt East Pacific Rise 13°N |
| 基金项目:The National Key Basic Research Program of China under contract No. 2013CB429700; the National Special Fund for the 12th Five Year Plan of COMRA under contract Nos DY125-12-R-02, DY125-11-R-05; the National Natural Science Foundation of China under contract Nos 40830849, 40976027 and 40906029; Shandong Province Natural Science Foundation of China for Distinguished Young Scholars under contract No. JQ200913. |
| Author Name | Affiliation | E-mail | | CHEN Shuai | Seafloor Hydrothermal Activity Laboratory of the Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
Graduate University of Chinese Academy of Sciences, Beijing 100049, China | chenshuai@qdio.ac.cn | | WANG Xiaoyuan | Seafloor Hydrothermal Activity Laboratory of the Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China | wangxiaoyuan@qdio.ac.cn | | YIN Xuebo | Seafloor Hydrothermal Activity Laboratory of the Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China | | | ZHANG Guoliang | Seafloor Hydrothermal Activity Laboratory of the Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China | |
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| Abstract: |
| This study reports the occurrence of anhydrite in hydrothermally altered pillow basalt (12°50.55'N, 103°57.62'W, water depth 2 480 m), which may have been produced in the basalt during seawater-basalt interaction in the laboratory. The existence of anhydrite in the altered basalt indicates extensive hightemperature hydrothermal alteration at the surface of seafloor pillow basalt. Microprobe analysis shows significant chemical zoning in the hydrothermally altered pillow basalt, in which Ca, Si and Al contents decrease and P, Fe, Mn, Cr and S contents increase from fresh basalt to altered basalt. The negative correlation between Rb-Sr and Li-Sr, and negative correlation between Li-Ca and Rb-Ca in the high-temperature vent fluids show that these fluids underwent anhydrite precipitation before fluid jetting due to mixing with seawater in the sub-seafloor. Based on these observations, we show that not all Ca in the anhydrite comes from basalt in the reaction zone, and that the basalts on the seafloor or in the upflow zone may also provide Ca for anhydrite. |
| 中文摘要: |
| This study reports the occurrence of anhydrite in hydrothermally altered pillow basalt (12°50.55'N, 103°57.62'W, water depth 2 480 m), which may have been produced in the basalt during seawater-basalt interaction in the laboratory. The existence of anhydrite in the altered basalt indicates extensive hightemperature hydrothermal alteration at the surface of seafloor pillow basalt. Microprobe analysis shows significant chemical zoning in the hydrothermally altered pillow basalt, in which Ca, Si and Al contents decrease and P, Fe, Mn, Cr and S contents increase from fresh basalt to altered basalt. The negative correlation between Rb-Sr and Li-Sr, and negative correlation between Li-Ca and Rb-Ca in the high-temperature vent fluids show that these fluids underwent anhydrite precipitation before fluid jetting due to mixing with seawater in the sub-seafloor. Based on these observations, we show that not all Ca in the anhydrite comes from basalt in the reaction zone, and that the basalts on the seafloor or in the upflow zone may also provide Ca for anhydrite. |
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