中国东部新生代火山作用时代与构造环境变迁  

GEOCHRONOLOGY OF CENOZOIC VOLCANISM IN EAST CHINA AND GLOBAL CHANGES OF TECTONIC ENVIRONMENT

作　　者：朱炳泉[1] 王慧芬[1] 杨学昌[1] 

机构地区：[1]中国科学院地球化学研究所

出　　处：《地球化学》1988年第3期209-215,共7页Geochimica

摘　　要：中国东部新生代火山岩K-Ar年龄与岩石化学研究表明,早第三纪(40—55Ma)均为拉斑与钙-碱性岩浆喷发,代表了弧后引张环境。渐新世期间火山作用处于相对平静阶段。中新世以后表现出拉斑与碱性玄武岩的交替喷发,在不同的构造带上表现出19—21Ma、14—15 Ma、5—8Ma与<1Ma期间的强碱性玄武岩喷发,大约7Ma为一周期。这种火山作用的时空与岩性变化特征与全球板块构造环境的重大变迁密切相联。K-Ar dating of the Cenozoic volcanics from East China and their petrochemistry indi-cate that early Tertiary volcanism is represented mainly by the eruptions of tholeiitic and calc-alkaline magmas. A relatively dormant stage occurred during Oligocene. Since Mio-cene (-26 Ma) alternative eruptions of tholeiites and alkali basalts took place. Strong erup-tions of alkali basalts in different tectonic directions occurred in the time-space age ranges of 19-21, 14-15, 5-8 and <1 Ma. The above time-space correlations and petrographical features of the volcanics are closely associated with great changes in global tectonic environ-ment.

关 键 词：新生代 火山 构造环境 K-AR年龄 岩石化学 

分 类 号：P317.2[天文地球—固体地球物理学] P584[天文地球—地球物理学]