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雷琼火山区地质地貌及年代学特征

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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14C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.
GEOLOGICAL GEOMORPHOLOGY AND CHRONOLOGICAL CHARACTERISTICS OF LEIQIONG VOLCANIC AREA
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 chro-nology 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 activi-ties 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 volcan-ic 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 ge-ochronological data of the Leiqiong volcanic area obtained by K-Ar,Ar-Ar,thermoluminescence and 14C 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.

Leiqiong Volcano AreaVolcanic geologyVolcanic landformsChronology

丁冉、李霓

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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

陆内火山与地震教育部重点实验室(中国地质大学),北京 100083

中国地震局地震与火山灾害重点实验室,北京 100029

雷琼火山区 火山地质 火山地貌 年代学

国家自然科学基金陆内火山与地震教育部重点实验室开放基金

42272351KLIVE2023-01

2024

内陆地震
新疆维吾尔自治区地震局

内陆地震

影响因子:0.495
ISSN:1001-8956
年,卷(期):2024.38(1)
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