摘要
保山地块的寒武系露头少,研究范围有限。长期以来,地学界对寒武系与奥陶系之间的接触关系存在较大争议,有人认为是整合接触,有人认为是假整合接触,囿于过去的工作精度,目前尚无定论。近年来,在保山施甸地区开展1∶5万区调工作时发现,区内普遍缺失早奥陶世沉积,仅在施甸半坡一带有中奥陶统,在大寨一带,中上奥陶统蒲缥组直接平行不整合在上寒武统保山组之上,结合晚寒武世—早奥陶世业已存在的岩浆活动,认为这是晚泛非运动的远程响应。
There are a few outcrops of Cambrian strata in Baoshan block,and hence researches in this aspect are limited.Controversy has long existed over the contact relationship between Cambrian and Ordovician strata.Some hold the opinion of conformable contact,others argue for pseudoconformity,and due to the insufficient work,no final conclusion has been reached.During the 1：50000 regional survey performed in Shidian area of Baoshan City,the authors found that Ordovician strata are commonly missing in this area,and Middle Ordovician strata only exist in Banpo area of Shidian.In Dazhai area,Middle-Upper Ordovician Pupiao Formation overlies Upper Cambrian Baoshan Formation in parallel unconformity.In combination with the existent Late Cambrain-Early Ordovician magmatic activities,the authors hold that these phenomena represent the long-distance response to Late Pan-African movement.
出处
《地质通报》
CAS
CSCD
北大核心
2012年第2期306-313,共8页
Geological Bulletin of China
基金
中国地质调查局项目<云南1:5万由旺街幅
施甸幅
姚关幅区域地质调查>(编号:1212010784005)
关键词
沉积缺失
平行不整合
晚泛非运动
滇西施甸地区
sedimentary gap parallel unconformity Late Pan-African movement Shidian area in western Yunnan
