K-Ar and 39Ar-40Ar Geochronology of Basalts from the <?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" /><st1:PlaceName w:st="on">Chad</st1:PlaceName> <st1:PlaceType w:st="on">Basins</st1:PlaceType>, <st1:place w:st="on">Africa</st1:place> and Its Geodynamics Setting <?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p>

设为首页

收藏本站

网站地图 | English | 公务邮箱

远程访问

NSTL服务站

K-Ar and ³⁹Ar-⁴⁰Ar Geochronology of Basalts from the Chad Basins, Africa and Its Geodynamics Setting

详细信息

责任者：Lu Yulin (Institute of Geology and Geophysics ; Chinese Academy of Sciences ; Beijing 100029 ; China) ; Liu Jiaqi
刊名：Acta Geologica Sinica
出版年：2009
卷期：83(8)
关键词：玄武岩 ; basalts ; 钾—氩计时 ; K-Ar dating ; 氩—氩计时 ; Ar-Ar dating ; Chad
页码：p.1125-1133
图表：2 illus., 2 tables, 23 refs.
分类号：0801
issnNo：ISSN0001-5717
isbnNo：CN11-1951/P

摘要

Doba, Bongor and Lake Chad basins in Chad are a series of the intra-continental rifted basins resulted from and controlled by the dextral strike-slip stress field along the Central African Shear Zone during Mesozoic-Cenozoic. A detailed chronology study shows that at least two periodic magmatic activities in the study areas can be recognized using K-Ar and Ar-Ar methods: 1) (95～75) Ma only in the Doba Basin; 2) (66～52) Ma, well expressed in Bongor Basin and Lake Chad Basin. The research shows that the Mesozoic-Cenozoic volcanic activities in Chad basins are the products of the intraplate extensional stress regime, corresponding to the tectonic setting of the whole West and Central African during Cretaceous. Magmatism is closely correlated with rifting.

地址：北京市海淀区学院路29号邮编：100083

电话：办公室：(+86 10)66554848；文献借阅、咨询服务、科技查新：66554700