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为约束吉林中部早侏罗世区域构造背景,并探讨长虫山二长花岗岩的地球化学特征及铀成矿潜力,本文对长虫山二长花岗岩开展LA-ICP-MS锆石U-Pb定年和全岩地球化学分析。锆石U-Pb定年显示,长虫山二长花岗岩形成于早侏罗世(184 ± 2 Ma)。全岩地球化学分析表明,该岩体具高SiO2(71.31%~72.36%)、高K2O(3.28%~3.84%)、高Al2O3(13.79%~14.36%)和高碱(7.51%~7.90%),低MgO(0.38%~0.80%)和FeOT(2.32%~3.22%)的特征;轻稀土元素和大离子亲石元素(Rb、K和Th等)较为富集,重稀土元素和高场强元素(Nb、Ta和Ti等)相对亏损,具明显Eu负异常(δEu = 0.358~0.571),属于I型花岗岩,岩浆源区为大陆地壳。长虫山二长花岗岩岩石地球化学特征显示其弧岩浆亲缘性,支持早侏罗世该区已受到古太平洋构造体系影响。长虫山二长花岗岩岩体具备一定铀富集基础,但其U含量偏低、分异程度有限、Th/U值较高,整体不具备明显铀矿化潜力。
Abstract:To constrain the Early Jurassic regional tectonic setting of central Jilin,and to investigate the geochemical characteristics and uranium metallogenic potential of the Changchongshan monzogranite,this study presents LA-ICP-MS zircon U-Pb geochronology and whole-rock geochemical analyses for the Changchongshan monzogranite. Zircon U-Pb dating indicates that the Changchongshan monzogranite was formed in the Early Jurassic (184 ± 2 Ma). Whole-rock geochemical data show that the pluton is characterized by high SiO2 (71.31%–72.36%),K2O (3.28%–3.84%),Al2O3 (13.79%–14.36%),and total alkalis (7.51%–7.90%),and low MgO (0.38%–0.80%) and FeOT (2.32%–3.22%). It is relatively enriched in light rare earth elements and large-ion lithophile elements,such as Rb,K,and Th,and relatively depleted in heavy rare earth elements and high-field-strength elements,such as Nb,Ta,and Ti,with distinct negative Eu anomalies (δEu = 0.358–0.571). These features indicate that the pluton belongs to I-type granite and that its magma source was continental crust. The petrogeochemical characteristics of the Changchongshan monzogranite indicate an arc-magmatic affinity,supporting the interpretation that this area had been influenced by the Paleo-Pacific tectonic system during the Early Jurassic. The Changchongshan monzogranite has a certain basis for uranium enrichment;however,its relatively low U contents,limited degree of magmatic differentiation,and high Th/U ratios indicate that it does not have obvious uranium mineralization potential overall.
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基本信息:
中图分类号:P619.14
引用信息:
[1]李良传,孙永刚.吉林中部长虫山二长花岗岩地球化学特征、构造背景及铀成矿潜力探讨[J].世界核地质科学().
基金信息:
安徽省教育厅高校自然科学重点科研项目(2024AH051826); 宿州学院博士(后)科研启动基金项目(2022BSK009;2023BSH001)
2026-06-23
2026-06-23
2026-06-23