Relationship of F-Be mineralization to granites and syenites at the Ermakovka deposit (Western Transbaikalia)

IF 1.3 4区地球科学 Q2 GEOLOGY

Geologica Acta Pub Date : 2020-01-29 DOI:10.1344/geologicaacta2020.18.2

G. Ripp, I. Izbrodin, M. Rampilov, A. Tomilenko, E. Lastochkin, V. F. Posokhov

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Abstract

The paper presents the mineralogical and geochemical characteristics of two groups of hydrothermal rocks and their relation with subalkaline granites of the Ermakovskoe deposit. The first group includes fluorite-phenakite-bertrandite ore bodies, occurring outside the granite massif. The second group is presented by silicification bodies with sulfates, phosphates, kaolinite, muscovite and hematite. It bears REE (rare earth elements) mineralization (monazite, florencite, xenotime) and occurs within the massif. Our research included isotopic analyses of Sr, Nd and O, studies of trace, including rare-earth element compositions and age determination (U-Pb) of apatite from F-Be ores. Geochemical and isotopic studies are not according with relation between F-Be ores and granites. This is proven by the absence of Be-mineralization in granites and schlieren pegmatites, and a sharp difference in composition of their fluid phases. A reductive fluid specification forming F-Be ores (containing CH 4 , H 2 , N 2 , CO 2 and H 2 S), contrasts sharply with fluid specification of granites. The granites are characterized by high oxygen fugacity, due to ferrous iron, sulfates and phosphates. Besides isotopic composition of oxygen in quartz (7.4 and 5.1‰ δ 18 О V-SMOW respectively), initial Sr ratios (0.7056-0.7065 and 0.707-0.709 respectively) and REE compositions are different.

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Ermakovka矿床F-Be矿化与花岗岩和正长岩的关系

本文介绍了Ermakovskoe矿床两组热液岩的矿物学和地球化学特征及其与亚碱性花岗岩的关系。第一组包括萤石-钠长英长英长矿体，产于花岗岩体外。第二类为含硫酸盐、磷酸盐、高岭石、白云母和赤铁矿的硅化体。它具有REE（稀土元素）矿化作用（独居石、萤石、异长岩），并出现在地块内。我们的研究包括Sr、Nd和O的同位素分析，微量元素的研究，包括稀土元素组成和F-Be矿石磷灰石的年龄测定（U-Pb）。地球化学和同位素研究不符合氟铍矿石和花岗岩的关系。花岗岩和纹影伟晶岩中不存在Be矿化，以及它们的液相组成存在明显差异，证明了这一点。形成F-Be矿石（含CH4、H2、N2、CO2和H2 S）的还原性流体特征与花岗岩的流体特征形成鲜明对比。由于含铁、硫酸盐和磷酸盐，花岗岩具有高氧逸度的特点。除了石英中氧的同位素组成（分别为7.4和5.1‰δ18ОV-SMOW）外，初始Sr比（分别为0.7056-0.7065和0.707-0.709）和REE组成也不同。

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来源期刊

Geologica Acta 地学-地质学

CiteScore

2.50

自引率

6.70%

发文量

审稿时长

>12 weeks

期刊介绍： - Relevant conceptual developments in any area of the Earth Sciences. - Studies presenting regional synthesis. - Thematic issues or monographic volumes presenting the results from one or more research groups. - Short papers reflecting interesting results or works in progress. - Contributions and results from Research Projects, Workshops, Symposiums, Congresses and any relevant scientific activity related to Earth Sciences. - Geologica Acta aims to stimulate rapid diffusion of results and efficient exchange of ideas between the widespread communities of Earth Science researchers (with special emphasis on Latinamerica, the Caribbean, Europe, the Mediterranean