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选取胡安.德富卡洋脊(Juan de Fuca Ridge,JDFR)因代沃(Endeavour)段的17个热液黑烟囱体样品对其中的硫同位素进行分析测定,讨论了因代沃段热液活动区内黑烟囱体成矿的物质来源、将硫同位素数据与已发表的热液流体及硫化物数据耦合,并结合前人的成果得到如下认识:(1)因代沃段硫化物的硫同位素组成与其他无沉积物覆盖的洋脊硫化物硫同位素组成相似,然而其相比于南胡安.德富卡洋脊(South Juan de Fuca Ridge,SJFR)硫化物亏损重同位素;(2)结合前人研究成果,如果SJFR硫化物的硫全部来自基底玄武岩的淋洗与海水中的硫酸盐,那么因代沃段硫化物的硫可能有1%～3%来自沉积物的贡献,故提出因代沃段成矿系统中的硫来源主要来自基底玄武岩,同时伴随有少量海水硫酸盐来源及沉积物来源的硫加入;(3)将硫同位素数据与已发表的热液流体及硫化物数据进行耦合发现热液流体中的沉积物信号与硫化物中的硫可能来自不同的源,并提出沉积物端元可能位于下渗区。
The sulfur isotopes in 17 hydrothermal black chimney samples from the Endeavor section of the Juan de Fuca Ridge (JDFR) were analyzed. The sources of the black chimney mineralization in the activity area coupled the sulfur isotope data with the published hydrothermal fluids and sulphide data and obtained the following knowledge based on previous achievements: (1) Sulfur The isotopic composition is similar to that of other sulfur-free sulfur-laden sulfur isotopes covered by unconsolidated sediments, however, compared to the SJFR heavy depleted heavy isotopes of the South Juan de Fuca Ridge (SJFR) ridge; (2) According to the results of previous studies, if the sulfur of SJFR sulfide comes from the leaching of basal basalt and the sulfate in seawater, then the sulfur content of sulfide in the intermediate section may be 1% ~ 3% of the contribution from sediments Sulfur sources in the Dawo segment metallogenic system are mainly derived from basement basalts accompanied by a small amount of seawater sulphate sources and sulfur from sediment sources; (3) sulfur isotope data are correlated with published hydrothermal fluids and sulphide data Coupling found in hydrothermal fluids Deposits signal sulfide sulfur may be from different sources, and may be located in the end member made sediments infiltration area.