| 山东烟台门楼水库火山岩剖面特征及地学意义 |
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| 引用本文：蒙永辉,赵希涛,程鸿雁,于得芹,王庆兵,王振涛,罗梅,刘妍芬.2022.山东烟台门楼水库火山岩剖面特征及地学意义[J].地球学报,43(5):730-736. |
| DOI：10.3975/cagsb.2022.031501 |
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| 基金项目:中国地质调查局地质调查项目“华北地区重要地质遗迹调查(山东)”(编号: DD2017078);山东省自然资源厅;山东省财政厅地质环境保护类项目“山东省重要地质遗迹调查”(编号: 鲁财建指[2012]110号) |
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| 中文摘要:在山东省地质遗迹调查研究中, 首次在烟台门楼水库东侧马山发现一处典型的火山岩侵入剖面。为进一步准确评价剖面地学意义, 在剖面中采取砂样1件及玄武岩样品3件, 分别利用ESR法和K-Ar法进行精确测年。结果表明: 胶东地区为地壳长期稳定或微微隆起的地区, 可作为我国第三地势阶梯中地壳稳定或相对隆升区的一个代表; 火山岩剖面为中新世晚期产物, 其火山活动大致可分为三期: 第一期为火山凝灰岩与火山集块岩喷发时期, 发生在7.19 Ma左右, 第二期为玄武岩的多期次溢流时期发生在6.75 Ma左右, 第三期为小型断裂活动与玄武岩脉的侵入时期, 发生在5.32 Ma左右, 但其规模明显弱于前两期。门楼水库火山岩剖面是我国少有的火山岩侵入剖面, 属典型地质遗迹资源, 具有较高的科研与保护价值。 |
| 中文关键词:地学意义 火山岩 剖面特征 门楼水库 山东省 |
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| Characteristics and Geological Significance of Volcanic Rock Profile in Menlou Reservoir of Shandong Province |
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| Abstract:A typical volcanic intrusion profile was found for the first time in Mashan, east of Yantai Menlou Reservoir, during the survey work of geological remains in Shandong Province. To accurately evaluate the geological significance of the profile, one sand sample and three basalt samples were profiled and accurately dated using ESR and K-Ar methods, respectively. Results showed that the Jiaodong area was a long-term stable or slightly uplifted area of the crust and could be regarded as a representative of the stable or relatively uplifted of Late Miocene. Furthermore, its volcanic activity can be roughly divided into three stages: The first stage is the eruption period of volcanic tuff and volcanic agglomerate, which occurred at approximately 7.19 Ma. The second stage is the multi-stage overflow period of basalt, which occurred at approximately 6.75 Ma. The third stage is the intrusion period of small fault activity and basalt vein, which occurred at approximately 5.32 Ma. However, its scale was obviously weaker than that of the first and second stage. The volcanic rock profile of Menlou Reservoir was a rare volcanic rock intrusion profile in China that belonged to a geological relic resource and had high scientific research and protection value. |
| keywords:geological significance volcanic rock profile characteristics Menlou Reservoir Shandong |
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