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冲绳海槽中部沉积物中热液源组分的顺序淋滤萃取研究

, PP. 369-379

Keywords: 元素堆积速率,顺序淋滤萃取,热液沉积物,冲绳海槽

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Abstract:

?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.

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