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研究聚焦大兴安岭地区早白垩世花岗岩的岩浆来源以及其构造演化背景,选取大兴安岭额尔古纳地块北段霍洛台地区花岗闪长岩为研究对象,通过对霍洛台花岗闪长岩进行锆石U-Pb定年和斜长石、黑云母的电子探针矿物化学成分测试,对花岗闪长岩形成时代、斜长石结构特征、黑云母成分特征以及岩浆源区进行了分析讨论。结果表明,霍洛台花岗闪长岩的加权平均年龄为137.6±1.0 Ma,代表其结晶年龄为早白垩世早期。霍洛台花岗闪长岩中的斜长石具有“反环带”结构,An值为13.90～26.54,平均值20.28,斜长石主要以更长石为主;黑云母属于镁质黑云母;黑云母结晶温度为709～748℃,平均值726℃,指示花岗岩体形成于相对高温的环境;结晶深度为3.37～4.05 km,平均值3.82 km,显示黑云母的结晶深度较浅;氧逸度为-16.52～-15.30,说明具有较高的氧逸度;黑云母TFeO/(TFeO+MgO)-MgO图解表明霍洛台花岗闪长岩为幔源成因并且在岩浆上升过程中有少量地壳物质的加入。基于此,研究认为霍洛台花岗闪长岩可能形成于与古太平洋板块俯冲相关的活动大陆边缘构造背景下。
Abstract：To investigate the magma source and tectonic background of Early Cretaceous granites in the Great Xing'an Range, this study selected the Huoluotai granodiorite in the northern segment of the Erguna Block as the research object.By conducting zircon U-Pb dating and electron probe mineral chemical analyses of plagioclase and biotite, the formation age, plagioclase structural characteristics, biotite composition, and magma source of the granodiorite were analyzed and discussed.The results indicate that the weighted mean age of the Huoluotai granodiorite is 137.6±1.0 Ma, representing its crystallization age in the Early Cretaceous.The plagioclase in the Huoluotai granodiorite exhibits a “reverse zoning” structure, with An values ranging from 13.90 to 26.54, with an average of 20.28, and is predominantly oligoclase.Biotite is classified as magnesium-rich biotite, with crystallization temperatures ranging from 709 to 748 ℃, averaging 726 ℃, suggesting the granite formed in a relatively high-temperature environment.The crystallization depth ranges from 3.37 to 4.05 km, with an average of 3.82 km, indicating relatively shallow crystallization of the biotite.The oxygen fugacity values range from -16.52 to -15.30, indicating relatively high oxygen fugacity.The TFe O/(TFe O+Mg O)-Mg O diagram of biotite suggests that the Huoluotai granodiorite is of mantle origin with minor crustal material involvement during magma ascent.Based on this, this study suggests that the Huoluotai granodiorite likely formed in an active continental margin tectonic setting associated with the subduction of the Paleo-Pacific Plate.
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基本信息:
DOI：10.13937/j.cnki.hbdzdxxb.2026.04.002
中图分类号:P588.12;P597.3;P548
引用信息:
[1]孙永刚,贺星舟,支宇博,等.大兴安岭额尔古纳地块北段霍洛台地区花岗闪长岩锆石U-Pb年龄、成因及构造背景[J].河北地质大学学报,2026,49(04):10-21.DOI:10.13937/j.cnki.hbdzdxxb.2026.04.002.
基金信息:
安徽省教育厅高校自然科学重点科研项目(2024AH051826); 宿州学院资助2025年省级大学生创新创业训练计划项目(S202510379068);宿州学院博士(后)科研启动基金项目(2022BSK009;2023BSH001)
2026-04-10
2026-04-10
2026-04-10