摘要
内蒙古锡林郭勒盟达里诺尔与阿巴嘎新生代大规模熔岩溢流火山作用形成数千平方千米的熔岩台地。本文利用^(40)Ar/^(39)Ar年代学测试技术以及ALOS-DEM数据研究熔岩台地时空分布规律。达里诺尔与阿巴嘎火山作用早期都有大规模熔岩溢流形成熔岩台地,晚期单成因火山作用形成零散分布的火山渣锥。贝力克牧场平顶山高低两级熔岩台地分别形成于~2.5Ma和~1.1Ma,阿巴嘎火山群熔岩台地形成于约6.2~7.5Ma。本文提出区域剥蚀模型解释在火山群边缘常见的多级熔岩台地的成因。火山作用与当地特殊气候引发的区域剥蚀共同作用造成多级熔岩台地地貌。
The Cenozoic flood-basalt volcanism formed widespread lava platforms in Xilin Gol League,Inner Mongolia.Herein,we focused on the lava platforms in Dalinor and Abaga volcanic fields and performed^(40)Ar/^(39)Ar geochronology as well as topography analysis,in order to identify its spatial-temporal distribution.Based on the field investigation,the volcanism in each field could be roughly divided into early and late stage.Flood-basalt volcanism formed lava platforms in the early stage.Whereas monogenetic volcanism built dispersedly scattered scoria cones atop the lava platforms in the late stage.The Dalinor lava platforms formed from~2.5Ma to~1.1Ma and the lava platforms of the Abaga volcanic field formed from ca.6.2Ma to 7.5Ma.We proposed that both the volcanism and regional denudation associated with the local climate might contribute to the geomorphology characterized by multilevel lava platforms.
作者
武颖
赵勇伟
李霓
常枥文
渠洪杰
WU Ying;ZHAO YongWei;LI Ni;CHANG LiWen;QU HongJie(State Key Laboratory of Earthquake Dynamics,Institute of Geology,China Earthquake Administration,Beijing 100029,China;Jilin Changbaishan Volcano National Observation and Research Station,Institute of Geology,China Earthquake Administration,Beijing 100029,China;Beijing Institute of Exploration Engineering,CGS,Beijing 100083,China)
出处
《岩石学报》
SCIE
EI
CAS
CSCD
北大核心
2023年第1期159-169,共11页
Acta Petrologica Sinica
基金
国家自然科学基金项目(41872255)
中国地震局地质研究所中央级公益性科研院所基本科研业务专项(IGCEA1917、IGCEA 2105)联合资助
