磷酸盐化作用对富钴结壳元素相关性的影响  

Effects of Phosphatization on the Elemental Association of Cobalt-Rich Crusts

作　　者：崔迎春[1] 石学法[2] 刘季花[2] 任向文[2] 

机构地区：[1]中国科学院海洋研究所,山东青岛266071 [2]国家海洋局第一海洋研究所海洋沉积与环境地质国家海洋局重点实验室,山东青岛266061

出　　处：《地质科技情报》2008年第3期61-67,共7页Geological Science and Technology Information

基　　金：国家自然科学基金项目(40704029;40376016);国际科技合作项目(2006DFB21620);国家海洋局青年基金项目(2005304)

摘　　要：为了探讨磷酸盐化作用对富钴结壳元素相关性的影响,用电感耦合等离子体发射光谱法(ICP-AES)和重量法测试了中太平洋CX海山富钴结壳的主、微量元素及稀土元素。首先以P质量分数和Y异常把富钴结壳分为磷酸盐化型[w(P)>0.57%且具有正Y异常]和未磷酸盐化型[w(P)<0.57且具有负Y异常]。结果表明,相比于未磷酸盐化型结壳,磷酸盐化型结壳中某些元素出现相对亏损和富集,其中亏损元素的亏损顺序为Si>Al>Fe>Co>Li>K>Pb>Na>Mg>V,而富集元素的富集顺序为P>Ca>REE>Ba>Sc>Mo>Cu>Ni>Ti>Sr>Zn>Mn;两类结壳相同元素间的相关性既有共性也有差别,Si-Al、Si-Fe和Si-Ca等元素间的相关性在两类结壳中变化不大,而P-Mn,P-Fe,Mn-Fe,Fe-Co等元素间的相关性则发生重要改变,这些相关性发生变化的元素对可指示结壳是否遭受磷酸盐化作用,元素丰度以及元素相关性的变化与磷酸盐化作用引起的结壳矿物组成变化有关。The major and minor elements of cobalt-rich crusts from Mid-Pacific CX seamount were analyzed using the inductively-coupled plasma atomic-emission spectrometry （ICP-AES） and gravimetric method, to investigate the effect of phosphatization on the elemental association of cobalt-rich crusts. At first, the Fe- Mn crusts are divided into two types： phosphatized Fe-Mn crusts with the P content more than 0.57% and the positive Y anomaly, and non-phosphatized Fe-Mn crusts with the P content less than 0. 57% and the negative Y anomaly. The results show that certain elements are depleted in phosphatized Fe-Mn crusts, compared to the non-phosphatized cobalt-rich crusts, in the approximate order Si〉AI〉Fe〉Co〉Li〉K〉Pb〉Na〉Mg〉V. However, others are enriched in the approximate order P〉Ca〉REE〉Ba〉Sc〉 Mo〉 Cu〉Ni〉Ti〉Sr〉Zn〉Mn. The similarities and difference of elemental associations to the same element pair also occur. For example, the correlation of Si/A1, Si/Fe and Si/Ca, and others show little change; however, great changes is seen in the correlation of P/Mn, P/Fe, Mn/Fe and Fe/Co, hence, these correlation changes can be used to indicate the phosphatization. The change of element compositions and elemental relativities is due to the mineral compositions variation induced by phosphatization.

关 键 词：中太平洋 CX海山 富钴结壳 元素相关性 

分 类 号：P595[天文地球—地球化学] P736.3[天文地球—地质学]