摘要
在班公湖—改则—革吉一带广布一套类复理石—复理石碎屑沉积,总体岩性单调,化石稀少,研究程度极低。对该套地层,尤其上部层位因缺乏年代依据,其时代归属及沉积上限一直争论较大,地层序列划分难以统一。在1∶25万日土幅区域地质调查过程中对该套地层进行了详细研究,于中上部层位中采获了较丰富的古生物化石,其时代归属为晚侏罗世。据沉积建造、岩性组合及古地理、古生物面貌特征,宜将其从原木嘎岗日地层分区划出,归入班戈-八宿地层分区,创建为多仁组、日松组。
A suite of flysch-flyschoid clastic deposits is widespread in the area of Bangong Co-Gêrzê-Gê′gyai. Generally, its lithology is monotonous, contained fossils are rare and the level of research is low. Owing to lacking of age evidence, especially for its upper part, there has been a heated debate about its age and upper boundary of deposits and it is difficulty to get a consensus on the stratigraphic division of the suite of deposits. During the regional geological survey of 1∶250000 Rutog Sheet, an intensive study was conducted of this suite of deposits and plenty of fossils were obtained from its middle and upper parts. Its age is assigned to Late Jurassic. According to the features of sedimentary formations, rock associations, paleogeography and fossil aspects, it is advisable to separate it from the original Mugagar Kangri stratigraphic area and attribute it to the Baingoin-Baxoi stratigraphic area and set up the Duoren Formation and Risum Formation.
出处
《地质通报》
CAS
CSCD
北大核心
2005年第7期642-647,共6页
Geological Bulletin of China
基金
中国地质调查局<1:25万日土幅区域地质调查>项目部分成果。
关键词
多仁组
日松组
新建
上侏罗统
日松地区
西藏
Duoren Formation
Risum Formation
new establishment
Upper Jurassic
Risum area
Tibet
