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为了解海底热液活动对沉积物元素赋存状态的影响,对东太平洋海隆(EPR)13°N和赤道附近表层沉积物样品17A-EPR-TVG1、17A-EPR-TVG5做了全样及顺序提取分析,探讨了Al、Ca、Fe、Mn、Ti、Ba、Zn、Cu、Sr、V、Mo、U及稀土元素赋存状态。XRD结果显示,17A-EPR-TVG1沉积物的主要矿物形态为黄铁矿,17A-EPR-TVG5沉积物样品主要矿物为方解石。受热液影响明显的17A-EPR-TVG1沉积物中,除Ca、Sr外,其余元素主要赋存于铁锰氧化物与残留相中。正常深海沉积物17A-EPR-TVG5中,除Al、Ba、Ti外,其余元素主要赋存于碳酸盐相及铁锰氧化物相中。稀土元素的顺序提取结果显示,17A-EPR-TVG1沉积物4个相态稀土元素北美页岩配分曲线中均有Eu正异常,17A-EPR-TVG5沉积物4个相态稀土元素北美页岩配分曲线中均出现Ce负异常,分别指示了二者形成过程中热液与海水的加入。
In order to understand the influence of seafloor hydrothermal activity on the occurrence of sediment elements, a complete sample and order of 17A-EPR-TVG1 and 17A-EPR-TVG5 in the surface sediment samples near the eastern Pacific Rift (EPR) 13 ° N and near the equator The authors analyzed the occurrence of Al, Ca, Fe, Mn, Ti, Ba, Zn, Cu, Sr, V, Mo, U and rare earth elements. XRD results showed that the main mineral form of 17A-EPR-TVG1 sediments was pyrite and the main mineral of 17A-EPR-TVG5 sediments was calcite. Among the 17A-EPR-TVG1 sediments, which are obviously affected by hydrothermal fluids, the other elements except Fe and Mn mainly exist in Fe-Mn oxides and residual phases. In the normal deep-sea sediment 17A-EPR-TVG5, except for Al, Ba and Ti, the other elements mainly exist in the carbonate phase and the Fe-Mn oxide phase. The results of sequential extraction of rare earth elements show that the positive Eu anomalies in North American shale distribution curves of 17A-EPR-TVG1 sediments and the four-phase REE North American shale distributions in 17A-EPR-TVG5 sediments Ce anomaly appears in the curve, indicating the addition of hydrothermal and seawater during the formation of the two.