琼北地区第四纪火山岩及其构造背景研究  

The Quaternary Volcanic Rocks and Tectonic Background Research of Qiong Bei Area

作　　者：刘雅丽[1] 肖文君[1] 

机构地区：[1]成都理工大学,四川成都610059

出　　处：《四川建材》2015年第1期204-206,共3页Sichuan Building Materials

摘　　要：对琼北地区第四纪火山岩形成的大地构造背景、喷发期次、岩石特征及岩浆的来源进行探讨,将该区的火山岩划分为五期,其岩石类型主要是石英拉斑玄武岩、橄榄拉斑玄武岩和碱性橄榄玄武岩;研究认为琼北地区的王五-文教东西向区域断裂及北西向断裂构造对第四纪火山岩的形成及空间分布具明显控制作用;根据Sr、Pb同位素及微量元素地球化学特征表明第四纪火山岩浆来源于上地幔,火山活动的构造背景属大陆板内裂谷环境。Through the study of the various features of the volcanic rocks,including rock structure,rock formations,the out-put state and so on,we can be familiar with the characteristics of the environment - forming and the ordinary evolution laws of ancient volcanic activities. This paper is written on the basis of investigation of quaternary volcanic rocks in northern Hainan are-a. According to the contact between volcanic rocks and Quaterna-ry strata, the previous absolute age of volcanic rocks and the weathering coefficient of weathering crust on the top of volcanic rocks,a variety of eruption products and sedimentary strata,peo-ple use the theories and methods of structural geology,geotecton-ics,petrology,general geology,chronology,volcanology,geochem-istry and so on to study the forming tectonic environment the di-viding of the times of the volcanic eruption,the source character-istics of igneous rocks,the evolution process and rock features of quaternary volcanic rocks in northern Hainan area. Volcanic rocks in the area is divided into five rock type is quartz tholeiite and alkaline olivine basalt. Studies suggest that in the northern area of Wangwu-Wenjiao regional faults and faulted structure of Quaternary volcano rock formation and spatial has obvious control effect. According to Sr、Pb isotope and trace element geochemistry of Quaternary volcano that magma originated from the upper man-tle,volcano active tectonics background belongs to continental in-traplate rift environment.

关 键 词：琼北地区 第四纪火山岩 火山活动 岩浆演化 

分 类 号：P588[天文地球—岩石学]