New Industrial Genetic Type of the Ediacaran Aphanitic Phosphorite Deposits

IF 0.7 4区 地球科学 Q4 GEOCHEMISTRY & GEOPHYSICS
A. F. Georgievskiy, V. M. Bugina, A. A. Georgievskiy, E. V. Karelina, V. E. Markov
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Abstract

A new industrial genetic (“aphanitic”) type of phosphorite deposits has been identified. In terms of the genetic, tectonic, facies, and geochemical features, this type differs fundamentally from the known micrograined, granular, nodular, shelly, and pebbly phosphorite deposits. They are the first industrial accumulations of phosphorus matter in the history of our planet. Conditions for their accumulation existed only in the Ediacaran period, when mass phosphatization of sediments with the formation of phosphate nodules as ribbon-shaped layers took place under the influence of early diagenetic processes. Phosphates were accumulated in basins with synsedimentary block structure inherited from paleorift structures and seismically active tectonic environment. The multidirectional displacement of blocks generated a complex seafloor relief and facies heterogeneous complex of sediments ranging from reefogenic-stromatolitic sediments in the uplifting areas to pelitic sediments in the dipping areas. The latter areas were marked by a massive input of sedimentary material significantly enriched in the planktonic organic matter. Transformation of organophosphorus compounds during the sulfate reduction promoted the phosphatization of sediments and the formation of aphanitic phosphorites, which differ from other ore types by anomalously high concentrations of As, Sr, and Ba and by anomalously low contents of U and REE.

Abstract Image

Abstract Image

埃迪卡拉纪闪长岩磷酸盐矿床的新工业基因类型
摘要 发现了一种新的工业基因("闪长岩")磷酸盐矿床类型。在成因、构造、岩相和地球化学特征方面,该类型与已知的微粒状、颗粒状、结核状、搁栅状和鹅卵石状磷酸盐矿床有着本质区别。它们是地球历史上最早的磷物质工业堆积。只有在埃迪卡拉纪,在早期成岩过程的影响下,沉积物大规模磷化,形成了带状的磷酸盐结核层,才具备了磷酸盐堆积的条件。磷酸盐是在盆地中堆积的,盆地具有从古隆起构造和地震活动构造环境中继承下来的合成沉积岩块结构。块体的多向位移产生了复杂的海底地形和多相沉积物,从隆起区的成礁-叠层沉积物到倾斜区的辉绿岩沉积物。后一区域的特点是大量沉积物的输入,浮游有机物含量显著增加。在硫酸盐还原过程中,有机磷化合物的转化促进了沉积物的磷化,并形成了闪长岩磷矿,与其他矿石类型不同的是,闪长岩磷矿中 As、Sr 和 Ba 的含量异常高,而 U 和 REE 的含量异常低。
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来源期刊
Lithology and Mineral Resources
Lithology and Mineral Resources 地学-地球化学与地球物理
CiteScore
1.30
自引率
37.50%
发文量
29
审稿时长
>12 weeks
期刊介绍: Lithology and Mineral Resources is an international peer reviewed journal that publishes articles on a wide range of problems related to the formation of sedimentary rocks and ores. Special attention is given to comparison of ancient sedimentary rock and ore formation with present-day processes. The major part of the journal is devoted to comparative analysis of sedimentary processes on the continents and in oceans, as well as the genetic aspects of the formation of sedimentary and hydrothermal–sedimentary mineral resources. The journal welcomes manuscripts from all countries in the English or Russian language.
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