Multiphase evolution of a Li-pegmatite field from the Tashisayi area, Altyn Tagh, NW China: insights from a petrological, geochemical, and geochronological study

IF 4.4 2区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS Mineralium Deposita Pub Date : 2023-12-14 DOI:10.1007/s00126-023-01237-0
Yin-Ce Ma, Xing-Wang Xu, Tao Hong, Wen-Kai Jin, Hang Li, Zhi-Quan Yang, Shan-Ke Liu, Kai Kang, Xue-Hai Wang, Lei Niu
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Abstract

The Tashisayi Li deposit was newly discovered in the eastern part of the Tashisayi batholith, located in the Altyn Tagh region of Northwest China. A Li-rich composite pegmatite-aplite dyke (γ02) displays superimposed relationships among different Li-bearing phases, including lepidolite-albite-quartz pegmatite (LAQ), spodumene-albite-quartz pegmatite (SAQ), and aplite. The timing and conditions of magmatism and Li mineralization in the Tashisayi remain enigmatic. The study involved field observations, U–(Th)–Pb dating of columbite-group minerals (CGM), zircon, and monazite, and geochemical analyses of CGM and quartz. U–Pb dating of CGM of the γ02 dyke revealed formation ages of 471.6±3.5 Ma (LAQ), 439.6±5.0 Ma (SAQ), and 416.3±4.8 Ma (aplite). Zircon U-Pb and monazite U-(Th)-Pb dating of biotite granite, pegmatitic aplite, and muscovite granite yielded ages of ca. 473 Ma, 439 Ma, and 425 Ma, respectively. The dating results indicate that the rare-metal pegmatites and granites in the Tashisayi area were emplaced during various periods from the Early Ordovician to Early Devonian, consistent with other rare-metal deposits in the Tugeman region. The textural and geochemical analyses on the CGM and quartz reveal that the LAQ, SAQ and aplite crystallized from highly evolved magmas under water-poor and relatively low temperature conditions, experiencing distinct evolution trend and forming processes. Additionally, both LAQ and SAQ were influenced by fluid or magma activities and the pegmatitic melt forming LAQ could enrich both Li and Sn. Extensive tectonic events in the Altyn Tagh Orogen, including ocean basin closure and continental collisions, promote the development of Li-rich granitic magmas. Thus, we argue that the multiple magmatic and Li mineralization events in the Tashisayi area are most likely originated from the melting of Proterozoic crustal materials, and the process was controlled by tectonic interactions between the Central Altyn, Southern Altyn, Northern Altyn, and Eastern Kunlun blocks.

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中国西北部阿尔金山塔什萨依地区锂辉石矿田的多相演化:岩石学、地球化学和地质年代研究的启示
塔什萨依锂矿床是在位于中国西北阿尔金山塔格地区的塔什萨依浴成岩东部新发现的。一个富含锂的辉长岩-闪长岩复合岩体(γ02)显示了不同含锂岩相之间的叠加关系,包括鳞片岩-闪长岩-石英辉长岩(LAQ)、闪长岩-闪长岩-石英辉长岩(SAQ)和辉长岩。塔什萨依岩浆作用和锂矿化的时间和条件仍然是个谜。这项研究包括实地观察,对铌铁矿群矿物(CGM)、锆石和独居石进行铀-(Th)-铅定年,以及对铌铁矿群矿物和石英进行地球化学分析。对γ02堤坝的铌铁榴石矿物进行的U-Pb测定显示,其形成年龄为471.6±3.5Ma(LAQ)、439.6±5.0Ma(SAQ)和416.3±4.8Ma(芒硝)。锆石U-Pb和独居石U-(Th)-Pb测定生物花岗岩、辉绿岩和蕈云母花岗岩的年代分别为约473 Ma、439 Ma和425 Ma。测年结果表明,塔什萨依地区的稀有金属伟晶岩和花岗岩是在早奥陶纪到早泥盆纪的不同时期形成的,这与图格曼地区的其他稀有金属矿床一致。对 CGM 和石英的纹理和地球化学分析表明,LAQ、SAQ 和辉长岩是在贫水和相对低温条件下由高度演化的岩浆结晶而成,经历了不同的演化趋势和形成过程。此外,LAQ 和 SAQ 均受到流体或岩浆活动的影响,形成 LAQ 的伟晶岩熔体可富集锂和锡。阿尔金山造山带广泛的构造事件,包括洋盆闭合和大陆碰撞,促进了富锂辉石岩浆的发育。因此,我们认为塔什萨依地区的多重岩浆和锂矿化事件很可能起源于新生代地壳物质的熔融,而这一过程受控于中阿尔泰、南阿尔泰、北阿尔泰和东昆仑块体之间的构造相互作用。
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来源期刊
Mineralium Deposita
Mineralium Deposita 地学-地球化学与地球物理
CiteScore
11.00
自引率
6.20%
发文量
61
审稿时长
6 months
期刊介绍: The journal Mineralium Deposita introduces new observations, principles, and interpretations from the field of economic geology, including nonmetallic mineral deposits, experimental and applied geochemistry, with emphasis on mineral deposits. It offers short and comprehensive articles, review papers, brief original papers, scientific discussions and news, as well as reports on meetings of importance to mineral research. The emphasis is on high-quality content and form for all articles and on international coverage of subject matter.
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