大兴安岭北段霍洛台地区辉绿玢岩的锆石U-Pb年龄、岩石成因和构造背景

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中文摘要：对于大兴安岭北段中生代火成岩的研究,在中酸性花岗岩和火山岩等方面已有诸多成果,相比之下,对于该区中生代基性岩浆岩具体的形成时代和岩石成因仍不明确.而且,大兴安岭北段晚侏罗世-早白垩世的构造背景也存在争议.为此,本文对大兴安岭北段霍洛台地区辉绿玢岩进行了锆石U-Pb年代学和岩石地球化学特征研究,以达到进一步明确大兴安岭北段晚中生代基性岩浆岩的形成时代、岩石成因及其构造背景的目的.结果表明:霍洛台地区辉绿玢岩锆石的加权平均年龄为(129.1±1.3)Ma,属于早白垩世;辉绿玢岩稀土元素配分曲线为平坦型,Eu异常不明显;富集大离子亲石元素(如Ba、Sr),亏损高场强元素(如Th、Ce、Ti).霍洛台辉绿玢岩可能起源于俯冲流体交代的岩石圈地幔源区,其形成可能受到了古太平洋板块俯冲作用的影响.

外文标题：Zircon U-Pb age,petrogenesis,and tectonic setting of the diabase porphyrite in the Huoluotai area,northern segment of the Great Xing'an Range

外文摘要：The study of Mesozoic igneous rocks in the northern segment of the Great Xing'an Range has yielded significant re-sults,particularly in the areas of intermediate to acidic granites and volcanic rocks.However,research on the specific formation ages,petrogenesis,and tectonic settings of Mesozoic mafic igneous rocks in this region has been relatively scarce.Moreover,there is ongoing debate regarding the tectonic setting of the northern segment of the Great Xing'an Range during the Late Jurassic-Early Cretaceous.Therefore,in order to further clarify the formation age,the petrogenesis and tectonic setting of the late Mes-ozoic basic magmatic rocks in the northern segment of the Great Xing'an Range,the zircon U-Pb chronology and petrogeochemi-cal characteristics of diabase porphyrite in the Huoluotai area were studied.The results show that the weighted mean zircon age of diabase porphyrite in the Huoluotai area is(129.1±1.3)Ma,which belongs to Early Cretaceous.The REE partition curve of diabase porphyrite is flat,and the Eu anomaly is not obvious.The samples are enriched in large-ion lithophile elements(e.g.,Ba and Sr),depleted in high-field-strength elements(e.g.,Th,Ce,and Ti).It is believed that the Huoluotai diabase porphyrite originated from the lithospheric mantle source that had previously been metasomatized by slab-derived fluids,and its formation may have been influenced by the subduction of the Paleo-Pacific Plate.

外文关键词：

Diabase prophyriteHuoluotaizircon U-Pb datinggeochemistrynorthern segment of the Great Xing'an Range

作者：

李焕纪、谢铖铖、孙永刚、张海涛、马双成、李斌

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作者单位：

宿州学院资源与土木工程学院,安徽宿州 234000

吉林省地质调查院,吉林长春 130102

关键词：

辉绿玢岩霍洛台锆石U-Pb定年地球化学大兴安岭北段

基金：

宿州学院资助2024年省级大学生创新创业训练计划宿州学院2022年博士科研启动基金项目2022年度宿州学院重点科研项目宿州学院2023年博士后科研启动基金项目

项目编号：

2022BSK0092022yzd012023BSH001

出版年：

2024

吉林地质

吉林省地质矿产勘查开发局

吉林地质

影响因子：0.263

ISSN：1001-2427

年,卷(期)：2024.43(2)