Age and Isotope-Geochemical Characteristics of Ta, Nb, W, Sn Mineralization Associated with Rare-Metal Granites (Khangilay Ore District, Eastern Transbaikalia)

IF 1 4区地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Petrology Pub Date : 2023-07-19 DOI:10.1134/S0869591123040033

E. V. Badanina, L. F. Syritso, A. A. Ivanova, N. G. Rizvanova

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Abstract

The age relations between the formation of the parent massif and the crystallization time of the associated ore mineralization were established based on isotope-geochronological study of the massif-deposits of the Khangilay ore cluster with various metallogenic specialization in Eastern Transbaikalia. In the Orlovka Li–F granite massif, the crystallization time of columbite–tantalite (145 ± 1 Ma) and cassiterite (144.2 ± 0.3 Ma) (U-Pb, ID-TIMS) is almost identical to the crystallization time of zircon (140.6 ± 2.9 Ма (U-Pb, SHRIMP) and 145 ± 1 Ma (U-Pb, CA-ID-TIMS)), which is an age marker of the formation of massifs. This fact testifies to the magmatogenic nature of rare-metal mineralization. In the Spokojnoye massif – the “standard type” of rare-metal peraluminous granites—a 0.6–3.8 Ma time gap was revealed between the time of massif formation (141.3 ± 1.8 Ма, U-Pb, SHRIMP, 146.9 ± 0.7 Ма, Rb-Sr isotopic system) and crystallization of wolframite (141.8 ± 0.6, Rb-Sr isotopic system and 140.1 ± 1.4 Ма, Sm-Nd isotopic system). This interval likely corresponds to the life time of the hydrothermal system, which produced tungsten mineralization.

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东跨贝加尔湖康吉莱矿区稀有金属花岗岩Ta、Nb、W、Sn成矿年龄及同位素地球化学特征

通过对外贝加尔东部不同成矿类型的康吉莱矿群地块矿床的同位素年代学研究，建立了母地块形成与伴生矿化结晶时间的年龄关系。在Orlovka Li-F花岗岩地块中，铌钽矿(145±1 Ma)和锡石(144.2±0.3 Ma) (U-Pb, ID-TIMS)的结晶时间与锆石(140.6±2.9 Ма (U-Pb, SHRIMP)和145±1 Ma (U-Pb, CA-ID-TIMS))的结晶时间基本一致，是地块形成的年龄标志。这一事实证明了稀有金属成矿的岩浆成因性质。在稀有金属过铝花岗岩的“标准型”Spokojnoye地块中，地块形成时间(141.3±1.8 Ма， U-Pb, SHRIMP, 146.9±0.7 Ма， Rb-Sr同位素系统)与黑钨矿结晶时间(141.8±0.6,Rb-Sr同位素系统和140.1±1.4 Ма， Sm-Nd同位素系统)之间存在0.6 ~ 3.8 Ma的时间差。这段时间可能与产生钨矿化的热液系统的生命期相对应。

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来源期刊

Petrology 地学-地球科学综合

CiteScore

2.40

自引率

20.00%

发文量

审稿时长

>12 weeks

期刊介绍： Petrology is a journal of magmatic, metamorphic, and experimental petrology, mineralogy, and geochemistry. The journal offers comprehensive information on all multidisciplinary aspects of theoretical, experimental, and applied petrology. By giving special consideration to studies on the petrography of different regions of the former Soviet Union, Petrology provides readers with a unique opportunity to refine their understanding of the geology of the vast territory of the Eurasian continent. The journal welcomes manuscripts from all countries in the English or Russian language.