论西藏扎达上白垩统波林夏拉组  

REMARKS ON THE UPPER CRETACEOUS BOLINXIALAFORMATION OF ZANDA,TIBET

作　　者：李国彪[1,2] 潘懋[1] 万晓樵[2] 谢丹[2] 修迪[2] 李兴鹏[2] 高茂龙[2] 耿彦杰[2] 

机构地区：[1]北京大学,北京100871 [2]中国地质大学(北京),北京100083

出　　处：《地层学杂志》2012年第1期37-48,共12页Journal of Stratigraphy

基　　金：国家重点基础研究发展计划项目"海相白垩纪重大地质事件与气候变化"(2006CB701402);国家自然科学面上基金项目(No.40972028);基本科研业务费优秀教师研究项目(2011YXL012)联合资助

摘　　要：上白垩统波林夏拉组的命名地点位于西藏西南部扎达波林,是一套以泥灰岩及灰岩为主的地层,底部以含海绿石灰岩与下伏下白垩统嘎姐组含海绿石石英砂岩整合接触,未见顶。波林夏拉组的时代据其所含丰富浮游有孔虫可被确定为晚白垩世Albian晚期至Maastrichtian晚期,其所含化石组合可以与晚白垩世特提斯喜马拉雅从台地到盆地的同时代序列进行对比。扎达地区的波林夏拉组与岗巴地区的宗山组两者之间在岩性组合上,尤其在时间跨度上有着明显的差异,两者不应被视为同物异名,故将波林夏拉组视为宗山组的同义名而予以废除的主张值得商榷,建议保留波林夏拉组一名。The Upper Cretaceous Bolinxiala Formation, named by Guo Tie-ying et al. （1991） based on a type section at Bolin of Zanda, southwestern Tibet, mainly consists of marls and limestones. The basal Bolinxiala Formation consists of glauconitic limestones and conformably overlies the glauconitic quartze sandstones of the upper Gajie Formation. Planktonic foraminiferal fossil assemblages identified from the Bolinxiala Formation at Bolin, Zanda, southwestern Tibet, give an age of latest Albian to Maastrichitan. The fossil contents of the Bolinxiala Formation allow its correlation with successions across a platform-to- basin transect of the Late Cretaceous Tethyan Himalaya passive margin. The new planktic foraminiferal biostratigraphic data indicate that the Bolinxiala Formation in Zanda has a much longer duration than that of the Zongshan Formation. Therefore, the Bolinxiala Formaton should not be substituted by the Zongshan Formation.

关 键 词：岩石地层单位 浮游有孔虫 波林夏拉组 晚白垩世 扎达 波林 西藏 

分 类 号：P534.53[天文地球—古生物学与地层学]