Generation and metallogenetic potentiality of cenozoic highly fractionated cuonadong leucogranite in the Tethyan Himalaya: evidence from U-Pb dating and in-situ B-Nd isotopes of accessory minerals

IF 3.2 2区地球科学 Q1 GEOLOGY

Ore Geology Reviews Pub Date : 2025-07-10 DOI:10.1016/j.oregeorev.2025.106740

Meng Liu , Da Wang , Zian Liu , Huchao Ma , Adama Berte , Kegang Dai , Shoucai Wei

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Abstract

Leucogranite as a window to understanding crustal evolution and associated metallogeny. The Cuonadong Sn-W-Be polymetallic deposit, located in the Tethyan Himalayan metallogenic belt, is the first newly discovered deposit with significant metallogenic potential in this region. This study aims to provide new insights into the origin and evolution of Himalayan leucogranites, addressing ongoing debates regarding their formation and the implications for regional metallogeny. We conducted U-Pb dating, Nd and B isotopic analyses, and elemental geochemistry on leucogranite and pegmatite from the Cuonadong gneiss dome to better understand the magmatic evolution and potential sources of the deposit. U-Pb dating of monazite from leucogranite and pegmatite yielded ages of 22.0 Ma and 28.9 Ma, respectively, while titanite from leucogranites provided ages of 40.6 Ma and 30.9 Ma. Notably, this is the first discovery of Late Eocene magmatism in the Cuonadong gneiss dome, significantly predating the previously recognized magmatic activity in the area. The B isotopic compositions of tourmaline in leucogranite and pegmatite range from –12.48 ‰ to –8.05 ‰, with an average of –9.88 ‰, similar to the mean δ¹¹B values of continental crust, indicating a dominant crustal source. Additionally, the εNd(t) values of monazite range from –13.16 to –11.95, with old two-stage Nd model ages (T_DM2) of 1.75–2.24 Ga, suggesting a source of partial melting from metamorphic sedimentary rocks. The discovery of Late Eocene magmatism (40.6 Ma) in the Cuonadong gneiss dome is a significant finding that revises the previously established magmatic timeline for the region. This finding implies greater mineralization potential not only for the Cuonadong gneiss dome but across the entire Tethyan Himalayan Belt, providing a new reference for the search exploration of rare metal.

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特提斯—喜马拉雅地区新生代高分选措那洞浅色花岗岩的成因及成矿潜力：来自U-Pb测年和副矿物原位B-Nd同位素的证据

浅花岗岩是了解地壳演化和成矿作用的窗口。措那洞Sn-W-Be多金属矿床位于特提斯喜马拉雅成矿带，是该地区首次新发现的具有重要成矿潜力的矿床。本研究旨在为喜马拉雅浅花岗岩的起源和演化提供新的见解，解决目前关于其形成及其对区域成矿作用的影响的争论。为更好地了解错那洞片麻岩穹丘的岩浆演化过程和矿床的潜在来源，对错那洞片麻岩穹丘的浅花岗岩和伟晶岩进行了U-Pb定年、Nd和B同位素分析和元素地球化学分析。白花岗岩体和伟晶岩中的独居石U-Pb年龄分别为22.0 Ma和28.9 Ma，而白花岗岩体中的钛矿年龄分别为40.6 Ma和30.9 Ma。值得注意的是，这是在措那洞片麻岩穹窿中首次发现晚始新世岩浆活动，大大早于该地区已知的岩浆活动。白花岗岩体和辉晶岩中电气石的B同位素组成变化范围为-12.48‰~ -8.05‰，平均为-9.88‰，与大陆地壳的平均δ11B值相近，表明其主要来源为地壳。单独居石的εNd(t)值在-13.16 ~ -11.95之间，两阶段Nd模式年龄（TDM2）为1.75 ~ 2.24 Ga，表明其来源为部分熔融变质沉积岩。措那洞片麻岩丘晚始新世岩浆活动（40.6 Ma）的发现，是对该地区岩浆活动年代学的重要修正。这一发现预示着错那洞片麻岩穹丘乃至整个特提斯喜马拉雅带具有更大的成矿潜力，为稀有金属的寻找勘探提供了新的参考。

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来源期刊

Ore Geology Reviews 地学-地质学

CiteScore

6.50

自引率

27.30%

发文量

546

审稿时长

22.9 weeks

期刊介绍： Ore Geology Reviews aims to familiarize all earth scientists with recent advances in a number of interconnected disciplines related to the study of, and search for, ore deposits. The reviews range from brief to longer contributions, but the journal preferentially publishes manuscripts that fill the niche between the commonly shorter journal articles and the comprehensive book coverages, and thus has a special appeal to many authors and readers.