地质通报2017，Vol.36Issue(10)：1691-1697,7.
内蒙古赤峰敖汉旗地区义县组地层划分与对比
Stratigraphic division and correlation of the Yixian Formation in Aohan area, Chi-feng, Inner Mongolia
摘要
Abstract
The Aohan area of Chifeng belongs to"northern volcanic eruption belt of Ningcheng-Daogelangyingzi". Regional sec-tion measuring and large-scale geological survey has shown that the strata which are composed mainly of volcanic rocks in the Aohan area should be grouped into Yixian Formation,and can be further divided into four lithologic members in the following ascending or-der:The first member consists of polymictic conglomerate and coarse sandstone gravel;the second member consists of acidic rhyolitic volcanics;the third member consists of a series of andesitic volcanic rocks and sedimentary facies tuff gritstone;and the fourth mem-ber consists of trachydacite volcanic rocks with medium to high alkaline features. The LA-ICP-MS zircon U-Pb data of volcanic rocks from each lithologic member in the area indicate that the volcanic activity occurred at 127.7~121.6 Ma, and this result can com-pare with things of the typical section of Yixian Fomation in northern Fuxin-Yixian basin. Rock assemblages and isotope dating re-sults show that the strata in Aohan area have similar lower and medium members, but the upper strata are absent, as shown by a corre-lation with strata of the typical section of Yixian Formation.关键词
地层划分/地层对比/早白垩世/义县组/LA-ICP-MS锆石U-Pb测年Key words
stratigraphic classification/stratigraphic correlation/Early Cretaceous/Yixian Formation/LA-ICP-MS zircon U-Pb dating分类
天文与地球科学引用本文复制引用
刘淼,陈井胜,李斌,李伟,杨帆..内蒙古赤峰敖汉旗地区义县组地层划分与对比[J].地质通报,2017,36(10):1691-1697,7.基金项目
中国地质调查局项目《辽宁1:5万台吉、他拉皋、七道岭、十二台营子幅区域地质调查》(编号:DD20160201-05)、《内蒙古敖汉旗大黄花地区矿产地质调查》(编号:12120114055501)和《内蒙古1:5万敖汉旗、捣格朗营子、新地、铁匠营子幅区域地质矿产调查》(编号:12120113053400) （编号:DD20160201-05）
