La Sota(厄瓜多尔)Puyango组石灰岩中钒铀地球化学异常的成因:初步结果

IF 0.9 4区 地球科学 Q3 GEOLOGY
John L. Manrique C., J. Ortiz, Antonio Delgado H.
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引用次数: 0

摘要

钒(V)和铀(U)是能源和技术工业的关键元素。它们的特点是在地壳岩石中丰度低,但在沉积和成岩过程中,由于氧化还原作用,它们可以集中并形成沉积矿床。在厄瓜多尔La Sota地区,在白垩纪黑色灰岩和黑色钙质页岩中发现了V-U异常。在这里,我们提出了一项地球化学研究和多元地质统计分析的结果,使我们能够推断出四种不同的关联:1)灰岩中含有V和Zn的浸染有机质,可能以有机金属配合物的形式存在;2)磷矿物和U、HREE和Ni的浓度,它们可能作为微量元素掺入磷酸盐中,与缺氧环境下的沉积相适应;3)来自海洋环境的碳酸盐中的Ca;(4)风化和侵蚀作用产生的与碎屑矿物相关的亲石元素,如石英、斜长石、长石、云母、粘土和Fe-Mn-Ti的氢氧化物等。研究结果表明,V主要与沥青灰岩中的海相有机质相关,而U主要与P相关,从而表明在沉积过程中形成了含铀磷酸盐。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Origin of the vanadium-uranium geochemical anomalies in the limestones of the Puyango Formation, La Sota (Ecuador): preliminary results
Vanadium (V) and uranium (U) are critical elements for the energy and technology industry. They are characterized by low abundance in the earth crust´s rocks, but can be concentrated and give rise to sedimentary mineral deposits as a result of redox processes during sedimentation and diagenesis. The anomalies of V-U in La Sota, Ecuador, are found in black limestones and black calcareous shales of Cretaceous age. Here we present the results of a geochemical study and a multivariate geostatistical analysis, which enables us to infer four different associations: 1) disseminated organic matter in the limestones that hold V and Zn, probably in the form of organometallic complexes; 2) phosphatic minerals and concentrations of U, HREE and Ni, which may be incorporated as trace elements in the phosphates, compatible with sedimentation in an anoxic environment; 3) Ca in carbonates from a marine environment; and, 4) litophile elements associated with detritic minerals, such as quartz, plagioclase, feldspar, micas, clays and oxyhydroxides of Fe-Mn-Ti, produced by weathering and erosion. Our findings suggest that V is associated mainly with the organic matter of marine origin in the bituminous limestones, while U is associated with P, thereby indicating the formation of uraniferous phosphates during sedimentation.
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来源期刊
Andean Geology
Andean Geology 地学-地质学
CiteScore
3.90
自引率
0.00%
发文量
17
审稿时长
>12 weeks
期刊介绍: This journal publishes original and review articles on geology and related sciences, in Spanish or English, in three issues a year (January, May and September). Articles or notes on major topics of broad interest in Earth Sciences dealing with the geology of South and Central America and Antarctica, and particularly of the Andes, are welcomed. The journal is interested in publishing thematic sets of papers and accepts articles dealing with systematic Paleontology only if their main focus is the chronostratigraphical, paleoecological and/or paleogeographical importance of the taxa described therein.
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