Robust monazite U-Pb and molybdenite Re-Os ages reveal the magmatic and metallogenic history of a highly evolved granitic system in the Xianghualing deposit, South China
Robust monazite U-Pb and molybdenite Re-Os ages reveal the magmatic and metallogenic history of a highly evolved granitic system in the Xianghualing deposit, South China
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稳健的独居石U-Pb和辉钼矿Re-Os年龄揭示了华南香花岭矿床高度演化的花岗岩系统的岩浆和成矿历史
DOI：
10.1016/j.oregeorev.2021.104602
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发表时间：
2021-11
影响因子：
3.3
通讯作者：
Li Bin
中科院分区：
文献类型：
--
作者：
Wu Qiong;Feng Cheng-You;Mao Jing-Wen;Santosh M.;Dick Jeffrey M.;Yu Miao;Li Bin
锡、钨和稀有金属是重要的战略金属，被认为与高度演化的花岗岩具有潜在的关系。然而，伴随着岩浆演化的大量铀聚集、复杂的熔体-流体相互作用以及晚期的热液蚀变，使得从高度演化的花岗岩系中获得准确的年龄信息变得困难。湘花岭矿床位于湘南中国，是一个与莱子岭和尖峰岭高演化花岗岩岩体空间共生的大型锡-铌-钽多金属矿床，是研究高演化岩浆的岩浆-热液作用及相关锡-Nb-Ta-多金属矿化的理想靶区。以往的研究已报道了从三叠纪到白垩纪的较大范围的侵入年龄和多期成矿作用。然而，岩浆侵位与锡-Nb-Ta多金属成矿作用之间的时间和成因联系仍存在争议。本文采用SHRIMP锆石U-Pb定年、LA-ICPMS锆石和独居石U-Pb定年、辉钼矿Re-Os定年等多种定年方法，获得了香花岭矿床的精确年代学格架。莱子岭原岩花岗岩的SHRIMP锆石U-Pb206Ph/238U加权年龄为156.4±11.5 Ma，而莱子岭钠长石花岗岩和云英岩化花岗岩的LA-ICPMS独居石U-Pb207Pb/238U校正下截年龄分别为155.5±100.7和155.3±100.5 Ma，代表莱子岭花岗岩的侵位年龄。与SHRIMP和LA-ICPMS锆石U-Pb年龄相比，钠长花岗岩和云英岩化花岗岩中的独居石提供了更准确的年龄信息。我们的研究表明，独居石可以作为一种可靠的工具来测定高度演化的花岗岩的年龄。莱子岭伟晶岩中辉钼矿的Re-Os等时线年龄为157.8 Ma±24.2 Ma，与莱子岭岩体的侵位年龄一致。结合前人报道的成矿年龄，揭示了莱子岭花岗岩与锡-铌-钽多金属矿化之间的时间和成因联系。尽管在南岭地区发现了多期锡钨成矿事件，但认为香花岭锡Nb钽成矿作用形成于晚侏罗世，与区域大规模钨锡成矿作用形成时间为160~150 Ma。
Tin, tungsten, and rare metals are key strategic metals and are regarded as having potentially relationship with highly evolved granites. However, excessive U accumulation with magmatic evolution, complex melt-fluid interaction, and late hydrothermal alteration make it difficult to obtain accurate age information from the highly evolved granitic system. The Xianghualing deposit, located in southern Hunan Province, China, is a giant Sn-Nb-Ta-polymetallic deposit with various types of mineralization spatially associated with the Laiziling and Jianfengling highly evolved granite plutons, and is an ideal target to investigate the magmatic-hydrothermal process of highly evolved magmas and related Sn-Nb-Ta-polymetallic mineralization. Previous studies have reported a relatively wide range of intrusion ages and multi-stage mineralization ranging from Triassic to Cretaceous. However, the timing and genetic link between magma emplacement and Sn-Nb-Ta-polymetallic mineralization remain controversial. Here we employ multiple dating methods, including SHRIMP zircon U-Pb analysis, LA-ICP-MS zircon and monazite U-Pb analysis, and molybdenite Re-Os dating analysis with a view to obtain a precise geochronological framework of the Xianghualing deposit. The SHRIMP zircon U-Pb data from the Laiziling protolithonite granite yielded a weighted206Pb/238U age of 156.4 ± 1.5 Ma, whereas the LA-ICP-MS monazite U-Pb age for the Laiziling albite granite and the greisenized granite show207Pb-corrected lower intercept206Pb/238U ages of 155.5 ± 0.7 and 155.3 ± 0.5 Ma, respectively, which represent the emplacement ages of the Laiziling granite stock. Compared with the scattered SHRIMP and LA-ICP-MS zircon U-Pb age, monazite from the albite granite and greisenized granite yields more precise age information. Our study shows that monazite can be used as a robust tool for dating highly evolved granites. Molybdenite from the Laiziling pegmatite yields a Re-Os isochron age of 157.8 ± 4.2 Ma, which is consistent with the emplacement age of the Laiziling pluton. This result, integrated with previously reported metallogenic age, suggests a temporal and genetic link between the Laiziling granite and Sn-Nb-Ta polymetallic mineralization. Although multi-stage Sn-W metallogenic events have been identified in Nanling Region, it is suggested that the Xianghualing Sn-Nb-Ta mineralization formed during the Late Jurassic within a short duration coeval with the regional large-scale W-Sn mineralization at 160–150 Ma.
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