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《Geochimica》 2011-02
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Lead and sulfur isotope constrains for metal sources of sulfide chimneys,Mothra hydrothermal field,Juan de Fuca Ridge,Nothern East Pacific Ocean

DONG Cong-fang1,2,3,ZHOU Huai-yang1,2,PENG Xiao-tong1,2,YUAN Yuan4 and YAO Hui-qiang5 1.Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou 510640,China;2.State Key Laboratory of Marine Geology,Marine School,Tongji University,Shanghai 200092,China;3.Graduate University of Chinese Academy of Sciences,Beijing 100049,China;4.No.215 Geological Team Co.,Ltd.in Guangxi,Liuzhou 545006,China;5.Guangzhou Marine Geology Survey,Guangzhou 510760,China  
The sulfide chimney collected from the Faulty Towers sulfide complexes in Mothra hydrothermal field(47°57.447′N,129°06.568′W) has been studied for lead and sulfur isotopic compositions.The range of lead isotopic compositions of the samples was: 206Pb/204Pb = 18.665~18.828,207Pb/204Pb = 15.460~15.607,and 208Pb/204Pb = 37.961~38.401.It is observed that lead isotopic compositions changed regularly across the chimney walls,with more radiogenic lead in the outer walls and lower lead isotope compositions in the inner walls and/or across the fluid channels.Sulfur isotopic compositions ranged from 0.4‰ to 2.1‰.Marcasite(0.5‰) and sphalerite(1.0‰) from the outer walls were enriched in light sulfur isotopoe,and wurzite had comparatively uniform values ranging from 1.3‰ to 2.1‰.Both lead and sulfur isotope data suggested that substrate basalts were the main metal sources of hydrothermal fluids,with some sedimentary source input.
【Fund】: 国家自然科学基金重点项目(40532011)
【CateGory Index】: P597
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