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本文针对冲绳海槽多种物源沉积作用混杂的特征,采用顺序淋滤萃取方法对海槽中部受热液活动影响的H9岩芯沉积物进行了分离.将沉积物分为可交换态、碳酸盐结合态、铁锰氧化物结合态、有机结合态和残渣态5个部分,对各个态中元素Al,Ti,K,Fe,Mn,Pb,Co,Cu,Ni和V组成进行了分析,确定了不同元素在不同结合态中的分配比例.结果表明,残渣态是冲绳海槽H9岩芯沉积物中元素的重要赋存形式,典型碎屑源组分Al,Ti和K在该态中比例高于95%,除Mn和Pb外其他元素在该态中比例均高于其他结合态.可交换态、碳酸盐结合态和有机结合态中各元素含量均相对较低,铁锰氧化物结合态是元素除残渣态外的另一优势赋存形式.热液源组分主要赋存于该相态之中,80cm以上层位沉积物中Fe,Mn,Pb,Co,Cu,Ni和V在铁锰氧化物结合态中含量和比例相对下段显著增加,以Mn和Pb最为典型,比例均超过50%,反映80cm以上层位受热液影响显著.文中根据80cm以上层位铁锰氧化物结合态中各元素含量简单估算了热液源Fe,Mn,Pb,Co,Cu,Ni和V的堆积速率,Mn元素堆积速率与洋中脊和Lau海盆等构造环境产出的热液影响沉积物相当,而Cu和Fe有所偏低.
In this paper, according to the mixed characteristics of sedimentary facies in the Okinawa Trough, the sequence of leaching and extraction was used to separate the H9 core sediments affected by hydrothermal activity in the middle of the trough, and the sediments were divided into exchangeable carbon The contents of Al, Ti, K, Fe, Mn, Pb, Co, Cu, Ni and V in all the states were analyzed in the following five parts: acid-salt bound, iron-manganese oxide bound, organic bound and residual , And the distribution ratio of different elements in different binding states was determined.The results show that the residual state is an important occurrence form of the elements in the sediments of H9 in the Okinawa Trough, and the typical source components Al, Ti and K in this state In the proportion of more than 95%, except for Mn and Pb other elements in this state were higher than the proportion of other bound exchangeable, carbonate bound and organic bound state of the elements are relatively low, iron and manganese The oxide-bound state is another dominant form of the element besides the residue state, and the hydrothermal source component mainly exists in the phase state. Among the sediments above 80 cm, Fe, Mn, Pb, Co, Cu, The contents and proportions of Ni and V in the Fe-Mn oxide bound state increased significantly compared with the lower part, with Mn and Pb being the most typical values, all of which exceeded 50%, reflecting The layer above 80cm is significantly affected by the hydrothermal fluid.The accumulation rate of Fe, Mn, Pb, Co, Cu, Ni and V from hydrothermal source is simply estimated based on the content of each element in the bound state of Fe-Mn oxides above 80cm, The elemental accumulation rate is similar to the hydrothermal-affected sediments produced by structural tectonics such as mid-ocean ridge and Lau Basin, while the Cu and Fe contents are relatively low.