States of element occurrence of sediments in the southern Okinawa Trough and its hydrothermal activity
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摘要:
为了解冲绳海槽南部沉积物的元素赋存状态以及热液活动对沉积物中元素组成的影响，对冲绳海槽南部沉积物岩芯HOBAB4-S2进行了全岩样及顺序提取分析，探讨了该沉积物岩芯中Al、Ti、K、Fe、Mn、Cu、Zn、Pb、Co、Ni及稀土元素的赋存状态，结果表明残留相与碳酸盐相是岩芯沉积物中元素的重要赋存形式，典型的碎屑组分Al、K、Ti在残留相中比例极高。铁锰氧化物相和有机结合相中各元素含量均相对较低，但在铁锰氧化物相中，与热液活动相关的金属元素在岩芯的萃取比例及含量上随着深度变化具有一致性，同时在4个层位出现了异常高值，表明在该层位对应的时期出现了热液活动对元素组成的显著影响，稀土元素总量变化上也可看出明显相同的变化趋势。沉积物的球粒陨石标准化稀土元素配分模式整体显示了轻稀土元素相对重稀土元素更富集的特征，具有极其轻微的Ce正异常和明显的Eu负异常，与南大西洋受热液活动影响较小的沉积物中铁锰氧化物相的配分模式类似，表明其受到热液流体的影响，是铁锰颗粒吸附海水与热液流体中稀土元素的结果。
Abstract:To understand the element occurrence states of sediments in the southern Okinawa Trough and the influence of hydrothermal activity on the elemental composition of the sediments, the whole-sample and sequential extraction of core HOBAB4-S2 from the southern Okinawa Trough were analyzed and the occurrence state of Al, Ti, K, Fe, Mn, Cu, Zn, Pb, Co, Ni, and rare earth elements in the sediment core. The results show that the residual phase and carbonate phase are the important forms of elements in the sediments, and the typical clastic components Al, K, and Ti have a high proportion in the residual phase. The contents of elements in Fe-Mn oxide and organic bound phases are relatively low, but in the Fe-Mn oxide phase, the extraction rates and contents of metallic elements associated with hydrothermal activity in the cores are consistent with depth, and anomalously high values appear in four layers, indicating that the significant influence of hydrothermal activity on elemental compositions occurred in the corresponding period of the layer. The same trend can be seen in the total amount of rare earth elements. The chondrite-normalized rare earth element distribution patterns of the sediments show evidence of light rare earth element enrichment relative to heavy rare earth elements, with very small positive Ce anomalies and obvious negative Eu anomalies. The case is similar to the distribution pattern of the Fe-Mn oxide phase of the sediments in the South Atlantic Ocean, showing that it was less affected by hydrothermal activity, but affected by hydrothermal fluids, which is the result of rare earth elements absorption by Fe-Mn particles in seawater and hydrothermal fluids.
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Key words:
- sediments /
- sequential extraction /
- element occurrence states /
- hydrothermal activity /
- Okinawa Trough
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