麦哲伦海山铁锰结壳中氟的古海洋环境意义

Determination and Implication for Paleoceanography Study of Fluorine of Iron-Manganese Crusts from the Magellan Seamounts

碳氟磷灰石的出现是铁锰结壳磷酸盐化的标志,氟是碳氟磷灰石的主要伴生元素。为了解氟作为铁锰结壳磷酸盐化指标的可行性,采用离子选择电极法测定了西太平洋麦哲伦海山区铁锰结壳中氟的质量分数,探讨了铁锰结壳中氟的分布特征、来源及其对磷酸盐化的指示作用。研究结果表明,铁锰结壳中的氟主要来源于海洋有机质的分解,并富集于受到磷酸盐化作用的结壳层中,以碳氟磷灰石为主要赋存相,氟对铁锰结壳的磷酸盐化作用有较为灵敏的指示作用。

The sign of the phosphatization is the appearance of carbonated-fluor apatite （CFA）, while fluorine is the main element associated with the authigenic carbonated-fluor apatite in the ferromanganese crusts. To prove the feasibility of using fluorine to indicate the phosphatization, this study measures the fluorine of iron-manganese crusts from the Magellan Seamounts in the western Pacific by a method of ion-selective electrode, and then discusses the distribution, sources and the indication of phosphatization of the fluorine in iron-manganese crusts . The results show that the main source of fluorine is the decomposition of ocean organism, and that the fluorine is enriched in the phosphatized crust layers, mostly in carbonatedfluor apatite. It is also a sensitive indicator for phosphatization.