LA-ICP-MS ZIRCON U-Pb DATING AND GEOCHEMISTRY OF THE GRANITES IN GANNAN AREA, DAXINGANLING MOUNTAINS: Geological Implication
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摘要:
通过对大兴安岭中北段甘南地区黑甘地1井钻遇的二云二长花岗岩进行LA-ICP-MS锆石U-Pb年代学和岩石地球化学研究, 确定其形成时代、岩石成因, 从而揭示区域构造背景. 花岗岩的锆石呈半自形-自形, 振荡生长环带明显. 测年结果显示, 二云二长花岗岩形成于161 Ma, 为晚侏罗世早期岩浆事件的产物. 地球化学分析结果显示, 岩石具有高硅(SiO2 69.81%~74.3%)、富铝(Al2O3 13.5%~16.8%)、贫铁(Fe2O3 0.26%~0.6%) 等特征, 在化学成分上属于准铝质-弱过铝质系列. 富集大离子亲石元素Rb、Ba、K和高场强元素Hf, 贫Nb、Ta、Ti等高场强元素; 相对富集轻稀土元素, 亏损重稀土元素, 为I型花岗岩. 岩浆起源于新增生加厚陆壳物质的部分熔融. 研究结果表明晚侏罗世早期二云二长花岗岩的形成与蒙古-鄂霍次克缝合带闭合过程中的陆-陆碰撞环境有关, 其形成时代限定了蒙古-鄂霍次克洋在大兴安岭中北段甘南地区的闭合时代为晚侏罗世早期.
Abstract:The formation age and petrogenesis of the two-mica monzogranite drilled from HGD-1 well in Gannan area of central-northern Daxinganling Mountains are determined and the regional tectonic setting is revealed on the basis of LA-ICP-MS zircon U-Pb chronology and petrogeochemistry studies. The zircons in granite are subidiomorphic-idiomorphic, with obvious oscillatory growth zone. The dating results show that the two-mica monzogranite was formed at 161 Ma, which is the product of magmatic event in early Late Jurassic. Geochemical analysis results indicate that the granite is characterized by high Si (SiO2 69.81%-74.3%), rich Al (Al2O3 13.5%-16.8%), and poor Fe (Fe2O3 0.26%-0.6%), belonging to quasi aluminous-weak peraluminous series in terms of chemical composition, with enriched LILEs (Rb, Ba and K) and HFSE (Hf), and depleted HFSEs (Nb, Ta and Ti), and relatively enriched LREEs and depleted HREEs, which is of I-type granite. The magma originates from the partial melting of newly thickened continental crust material. The study results reveal that the formation of the early Late Jurassic two-mica monzogranite is related to the continent-continent collision environment during the closure progress of Mongol-Okhotsk suture zone, and its formation age restricts the closing time of Mongol-Okhotsk Ocean to the early Late Jurassic in Gannan area of central-northern Daxinganling Mountains.
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Key words:
- Late Jurassic /
- two-mica monzogranite /
- zircon U-Pb age /
- geochemistry /
- Mongol-Okhotsk Ocean /
- Daxinganling Mountains
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