辽西北票和义县地区义县组综合对比研究  

Comprehensive correlation of the Yixian Formation in the Beipiao and Yix ian areas,western Liaoning

作　　者：张宏[1] 王五力[2] 李之彤[2] 杨芳林[2] 

机构地区：[1]西北大学地质系,陕西西安710069 [2]中国地质调查局沈阳地质矿产研究所,辽宁沈阳110032

出　　处：《地质通报》2004年第8期766-777,共12页Geological Bulletin of China

基　　金：科技部2000年度科技基础性工作第35专项;国土资源部专项(9501122-3);中国地质调查局项目(200113000052-2)资助。

摘　　要：辽西北票、义县两地区的义县组层位对比问题一直存在争议。两地区义县组典型剖面区的岩石学、地球化学和同位素年代学等方面的对比研究表明,北票四合屯地区含鸟珍稀化石层位——尖山沟层及以下层位的义县组与义县地区义县组砖城子层及以下层位可比,而与义县地区义县组的其他层位不可比。这两个地区义县组关系的确定,对深入研究辽西地区义县组顶底时代、火山活动规模和强度以及沉积-古生态环境的横向变化等问题均有重要意义。The comprehensive correlation of the Yixian Formation in the Beipiao and Yixian areas has long been a controversial problem.A comparative study of the petrology,geochemistry and isotope chronology at the typical sections of the Yix ian Formation in the two areas indicates that the horizon con-taining bird fossils(the Jianshangou lay er)and the Yixian Formation below the horizon in the Sihetun area,Beipiao,may correlate with the Zhuanchengzi layer of the Yixian Formation and the horizon below the layer in the Yixian area,but cannot correlate with other horizons of the Yixian Formation in the Yixian area.The determination of the relation of the Yixian Formation in the Beipiao and Yixian areas has great significance to the intensive study of the ages of the top and bottom of the Yixian Formation,scale and intensity of volcanic activities and lateral changes of the sedimentary-ecological environment in western Liaoning.

关 键 词：义县组 综合对比 岩石学 地球化学 同位素年代学 辽西 

分 类 号：P534.53[天文地球—古生物学与地层学]