沉积海相磷灰石中稀土元素混合成因的可能性——以埃及Abu-Tartur高原白垩系(Campanian-Maastrichtian) Duwi组磷灰岩为例

IF 16.4 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY
G. El-Habaak, M. Askalany, M. Abdel-Hakeem
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引用次数: 3

摘要

众所周知,沉积磷灰石晶格中的稀土元素通常来源于环境海水。这项研究首次记录了埃及西部沙漠磷矿中存在的磷灰石稀土元素混合来源的可能性,称为Abu-Tartur磷矿,这是中东和北非最重要的沉积磷矿堆积之一。REEs的页岩状模式、负Ce异常和所研究的磷矿的(La/Sm)N−(La/Yb)N二元图表明,在晚期成岩过程中,环境海水通过置换作用将REEs结合到磷灰石晶格中。第二个成因归因于含REE的浅生流体,这导致沉积辉长岩以绿色边缘和斑块的形式出现,在黑色磷光体逐渐氧化为棕色的地方,总REE含量约为14.93wt%。例如,强烈的化学风化导致碳酸盐-氟磷灰石的晶格优先向溶液释放Ca2+和CO32-离子物种,从而形成碳酸盐贫化层,其中稀土元素,特别是重稀土元素,被掺入蚀变磷灰石晶格内的优先Ca2+位置,从而形成辉橄榄岩。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Possibility of Mixed Origin of Rare Earth Elements in Sedimentary Marine Apatites: A Case Study from Phosphorites in the Cretaceous (Campanian-Maastrichtian) Duwi Formation, Abu-Tartur Plateau, Egypt
It is well known that the rare earth elements (REEs) incorporated in the crystal lattice of sedimentary apatite are commonly derived from ambient seawater. This study documents, for the first time, the possibility of mixed origin of apatite REEs present in the Egyptian Western Desert phosphorites, known as the Abu-Tartur phosphorites, one of the most important accumulations of sedimentary phosphorites in the Middle East and North Africa. Shale-like patterns of REEs, negative Ce anomalies, and a (La/Sm)N−(La/Yb)N binary diagram of the studied phosphorites indicate that the incorporation of REEs into apatite crystal lattices has occurred from the ambient seawater by substitution during late-stage diagenesis. The second origin is attributed to REE-bearing supergene fluids, which resulted in the occurrence of sedimentary britholite as green rims and patches containing about 14.93 wt% total REEs in places where the black phosphorites are gradually oxidized into the brown variety. For instance, the intensive chemical weathering induces the crystal lattice of carbonate fluorapatite to preferentially release Ca2+ and CO32− ion species to solution, resulting in the formation of a carbonate-depleted layer in which REEs, particularly heavy REEs, are incorporated into the preferential Ca2+ sites inside the altered apatite lattice, leading to britholite formation.
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来源期刊
Accounts of Chemical Research
Accounts of Chemical Research 化学-化学综合
CiteScore
31.40
自引率
1.10%
发文量
312
审稿时长
2 months
期刊介绍: Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.
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