关于保加利亚东北部卡斯皮昌以南多布林多尔地层中图伦纪结核磷酸盐床的新数据

Millena Vetseva, A. Hikov, D. Dochev, Yavor Stefanov
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引用次数: 0

摘要

卡斯皮昌附近出露的都龙纪结核含磷酸盐岩床由早期成岩矿化(碳酸盐-萤石-CFA、青绿石和网纹石)石灰岩碎屑岩(结核)、矿化大型动物和非矿化内碎屑岩组成,嵌入青绿石-CFA胶结物中。结核床的特征与极低净沉积率下的形成相一致,结核显示了再加工的证据。已确定的褐铁矿关联推断该岩床的年代为晚都龙纪。XRF 和 LA-ICPMS 分析表明,P、U 和 REE-Y 的浓度较低,REE 与其他自生氧化物之间的相关性表明,萤石和网纹石可能是主要的 REE 富集物,CFA 也是如此。氧化还原条件的波动是由自生矿物关联、成矿阶段、各种动物群和蛭石的存在以及应用的地球化学代用指标所暗示的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
New data on the Turonian nodular phosphate-bearing bed in the Dobrindol Formation south of Kaspichan, NE Bulgaria
The Turonian nodular phosphate-bearing bed outcropping near Kaspichan consists of early diagenetically mineralized (carbonate-fluorapatite – CFA, glauconite and goethite) limestone lithoclasts (nodules), mineralized macrofauna, and non-mineralized intraclasts, embedded in a glauconite-CFA cement. The characteristics of the nodular bed are consistent with a formation under extremely low net sedimentation rate with nodules demonstrating evidence for reworking. The identified ammonite association assigns late Turonian age of the bed. XRF and LA-ICPMS analyses reveal low P, U, and REE-Y concentrations, with correlations between REE and the other authigenic oxides indicating that glauconite and goethite could be main REE concentrators along with CFA. Fluctuations in the redox conditions are implied by the authigenic mineral association, mineralization stages, presence of diverse fauna and ichnofissils, and applied geochemical proxies.
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