naa a22 4500 510754732 CHVBK 20180411083118.0 cr unu---uuuuu 180411e20130201xx s 000 0 eng 10.1007/s13131-013-0270-z doi (NATIONALLICENCE)springer-10.1007/s13131-013-0270-z Genesis of anhydrite in hydrothermally altered basalt from the East Pacific Rise near 13°N [Elektronische Daten] [Shuai Chen, Xiaoyuan Wang, Xuebo Yin, Guoliang Zhang] 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 high-temperature 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. The Chinese Society of Oceanography and Springer-Verlag Berlin Heidelberg, 2013 anhydrite nationallicence hydrothermal alteration nationallicence pillow basalt nationallicence East Pacific Rise 13°N nationallicence Chen Shuai Seafloor Hydrothermal Activity Laboratory of the Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, 266071, Qingdao, China aut Wang Xiaoyuan Seafloor Hydrothermal Activity Laboratory of the Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, 266071, Qingdao, China aut Yin Xuebo Seafloor Hydrothermal Activity Laboratory of the Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, 266071, Qingdao, China aut Zhang Guoliang Seafloor Hydrothermal Activity Laboratory of the Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, 266071, Qingdao, China aut Acta Oceanologica Sinica The Chinese Society of Oceanography 32/2(2013-02-01), 12-17 0253-505X 32:2<12 2013 32 13131 https://doi.org/10.1007/s13131-013-0270-z text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s13131-013-0270-z text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Chen Shuai Seafloor Hydrothermal Activity Laboratory of the Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, 266071, Qingdao, China aut NATIONALLICENCE 700 1- Wang Xiaoyuan Seafloor Hydrothermal Activity Laboratory of the Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, 266071, Qingdao, China aut NATIONALLICENCE 700 1- Yin Xuebo Seafloor Hydrothermal Activity Laboratory of the Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, 266071, Qingdao, China aut NATIONALLICENCE 700 1- Zhang Guoliang Seafloor Hydrothermal Activity Laboratory of the Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, 266071, Qingdao, China aut NATIONALLICENCE 773 0- Acta Oceanologica Sinica The Chinese Society of Oceanography 32/2(2013-02-01), 12-17 0253-505X 32:2<12 2013 32 13131 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer