Trace-Element Composition of Titanium Phases of Leucoxene–Quartz Ores from the Yarega Oil–Titanium Deposit, South Timan

IF 0.8 4区地球科学 Q3 GEOLOGY Geology of Ore Deposits Pub Date : 2024-02-07 DOI:10.1134/s1075701523070097

S. G. Skublov, A. O. Krasotkina, A. B. Makeyev, O. L. Galankina

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Abstract

The distribution of trace elements (secondary ion mass spectrometry method) in rutile from the Yarega oil–titanium deposit was studied for the first time. A significant difference in the composition in the series leucoxene–rutile leucoxene (rutile with microscopic quartz inclusions)–rutile (recrystallized crystals) was established. Leucoxene is characterized by increased contents of the following elements (average values): Al (20 650 ppm), Fe (4833 ppm), Nb (2229 ppm), Zr (1273 ppm), Cr (436 ppm), V (1191 ppm), Sn (230 ppm), W (130 ppm), and Th (125 ppm). As leucoxene is converted to rutile leucoxene, represented by rutile with numerous quartz inclusions, a decrease in the contents of almost all trace elements, with the exception of V, was recorded. The Fe content decreases to 1892 ppm, that of Al to 1468 ppm, of Nb to 605 ppm, of Zr to 409 ppm, of Sn to 46 ppm, and of Cr to 181 ppm. A separate group is represented by rutile grains, in which one can observe a combination of rutile with numerous inclusions of quartz and “pure” rutile (recrystallized rutile with inclusions). The main trend in the change in the composition of rutile is a significant decrease in contents of a number of trace elements, compared with leucoxene and rutile leucoxene: the average V content is 71 ppm in rutile, 2.5 ppm in Sn, 144 ppm in Zr, 2.4 ppm in Hf, 52 ppm in Cr, and 677 ppm in Fe. There is also a decrease in Sb, Th, and U contents to about 1 ppm. There is a tendency toward accumulation of Nb when comparing rutile leucoxene and “pure” rutile. One can assume that the purification of rutile from admixtures as rutile leucoxene is transformed into sites of “pure” rutile (anatase?), up to the formation of single idiomorphic rutile crystals is a consequence of the hydrothermal process previously recorded in the geochemical characteristics of zircons from the Yarega deposit.

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南 Timan 地区亚雷加石油钛矿床褐煤石英矿石中钛相的微量元素组成

摘要首次研究了亚雷加石油钛矿床金红石中微量元素的分布（二次离子质谱法）。研究发现，白钨矿-金红石-白钨矿（具有微小石英包裹体的金红石）-金红石（再结晶晶体）系列的成分存在明显差异。铝（20 650 ppm）、铁（4833 ppm）、铌（2229 ppm）、锆（1273 ppm）、铬（436 ppm）、钒（1191 ppm）、锡（230 ppm）、钨（130 ppm）和钍（125 ppm）。随着白褐煤转化为金红石白褐煤（以含有大量石英包裹体的金红石为代表），除 V 元素外，几乎所有微量元素的含量都有所下降。铁含量降至 1892 ppm，铝含量降至 1468 ppm，铌含量降至 605 ppm，锆含量降至 409 ppm，锡含量降至 46 ppm，铬含量降至 181 ppm。金红石晶粒是一个独立的组别，其中可以观察到带有大量石英包裹体的金红石和 "纯 "金红石（带有包裹体的再结晶金红石）的组合。与白褐晶和金红石白褐晶相比，金红石成分变化的主要趋势是一些微量元素的含量显著下降：金红石中 V 的平均含量为 71 ppm，Sn 为 2.5 ppm，Zr 为 144 ppm，Hf 为 2.4 ppm，Cr 为 52 ppm，Fe 为 677 ppm。此外，锑、钍和铀的含量也下降到约百万分之 1。金红石白玉烯和 "纯 "金红石相比，铌有累积的趋势。我们可以假设，当金红石白附晶转变为 "纯 "金红石（锐钛矿？）时，金红石从掺杂物中提纯，直至形成单个非拟金红石晶体，这是之前在亚雷加矿床锆石地球化学特征中记录的热液过程的结果。

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来源期刊

Geology of Ore Deposits 地学-地质学

CiteScore

1.10

自引率

14.30%

发文量

审稿时长

6-12 weeks

期刊介绍： Geology of Ore Deposits is a periodical covering the topic of metallic and nonmetallic mineral deposits, their formation conditions, and spatial and temporal distribution. The journal publishes original scientific articles and reviews on a wide range of problems in theoretical and applied geology. The journal focuses on the following problems: deep geological structure and geodynamic environment of ore formation; distribution pattern of metallogenic zones and mineral deposits; geology and formation environment of large and unique metallic and nonmetallic deposits; mineralogy of metallic and nonmetallic deposits; physicochemical and isotopic characteristics and geochemical environment of ore deposition; evolution of ore-forming systems; radiogeology and radioecology, economic problems in exploring, developing, and mining of ore commodities.