雷琼火山区地质地貌及年代学特征  

GEOLOGICAL GEOMORPHOLOGY AND CHRONOLOGICAL CHARACTERISTICS OF LEIQIONG VOLCANIC AREA

作　　者：丁冉 李霓[1,2,3] DING Ran;LI Ni(Jilin Changbaishan Volcano National Observation and Research Station,Institute of Geology,China Earthquake Administration,Beijing 100029,China;Key Laboratory of Inland Volcanoes and Earthquakes,Ministry of Education,Beijing 100020,China;Key Laboratory of Seismic and Volcanic Hazards,China Earthquake Administration,Beijing 100029,China)

机构地区：[1]吉林长白山火山国家野外科学观测研究站,中国地震局地质研究所,北京100029 [2]陆内火山与地震教育部重点实验室(中国地质大学),北京100083 [3]中国地震局地震与火山灾害重点实验室,北京100029

出　　处：《内陆地震》2024年第1期22-33,共12页Inland Earthquake

基　　金：国家自然科学基金项目(42272351);陆内火山与地震教育部重点实验室开放课题(KLIVE2023-01).

摘　　要：为了深入认识雷琼火山区,搜集了前人在雷琼地区所做的相关研究,对本区的火山地质地貌及年代学特征进行概述。资料显示,雷琼地区受到板块运动和地幔柱活动的共同影响,被NW、NE和EW向三组断裂带控制,火山活动强烈。在雷州半岛EW向黄坡—界炮断裂带和海南岛北部EW向王武—文教断裂带中间形成了雷琼坳陷盆地,该盆地内存在大量的基性玄武岩喷发。雷琼地区火山活动呈现多期次、多旋回、迁移性的特点,存在爆发相、喷溢相和喷溢—沉积相3种火山作用方式,形成了熔岩台地、火山锥、玛珥湖、火山穹隆和熔岩隧道等火山地貌类型。雷琼地区岩浆活动始于渐新世晚期,在更新世最为广泛,之后火山活动衰落并在全新世结束。前人用K-Ar、Ar-Ar、热释光和^(14)C等多种测年方法得到的雷琼火山区的年代学数据,结果显示区内火山岩的年龄范围在34.78~0.01 Ma之间,并将火山活动分为6个阶段:渐新世-中新世、上新世、早更新世、中更新世、晚更新世和全新世。In order to deeply understand the Leiqiong volcanic area,the relevant research done by the predecessors in the Leiqiong area was collected,and the volcanic geological features and chronology characteristics of the area were summarized.The data show that the Leiqiong area is affected by plate movement and mantle plume activity,and is controlled by three groups of NW,NE and EW fault zones,with strong volcanic activity.The Leiqiong depression basin was formed between the EW Huangpo-Jiepao fault zone in Leizhou Peninsula and the EW Wangwu-Wenjiao fault zone in northern Hainan Island.There are a large number of basic basalt eruptions in the basin.The volcanic activities in Leiqiong area are characterized by multi-stage,multi-cycle and migration.There are three types of volcanism:explosive facies,effusive facies and effusive-sedimentary facies,forming volcanic landform types such as lava platform,volcanic cone,Maar lake,volcanic dome and lava tunnel.The magmatic activity in Leiqiong area began in the late Oligocene,which was the most extensive in the Pleistocene,and then the volcanic activity declined and ended in the Holocene.The previous geochronological data of the Leiqiong volcanic area obtained by K-Ar,Ar-Ar,thermoluminescence and^(14)C dating methods show that the age range of the volcanic rocks in the area is between 34.78 and 0.01 Ma,and the volcanic activity is divided into six stages:Oligocene-Miocene,Pliocene,Early Pleistocene,Middle Pleistocene,Late Pleistocene and Holocene.

关 键 词：雷琼火山区 火山地质 火山地貌 年代学 

分 类 号：P315.7[天文地球—地震学]