西昆仑甜水海地区晚石炭世孢粉及牙形刺化石的发现及意义  

DISCOVERY AND SIGNIFICANCE OF LATE CARBONIFEROUS SPOROPOLLEN AND CONODONT FOSSILS IN TIANSHUIHAI AREA,WEST KUNLU

作　　者：陈思尧 孙勇[1] 李有波 赵波 游水生 侯宝平 CHEN Si Yao;SUN Yong;LI You Bo;ZHAO Bo;YOU Shui Sheng;HOU Bao Ping(Sichuan Geology and Mineral Bureau Regional Geological Survey Team,Chengdu 610213;Sichuan Geological Survey,Chengdu 610081;Sichuan Rongda Pengcheng Construction Engineering Co.,Ltd,Chengdu 610213)

机构地区：[1]四川省地质矿产勘查开发局区域地质调查队,四川成都610213 [2]四川省地质调查院,四川成都610081 [3]四川省容大鹏程建设工程有限公司,四川成都610213

出　　处：《地层学杂志》2022年第1期60-67,共8页Journal of Stratigraphy

基　　金：新疆地勘基金(K15-1-LQ07)资助。

摘　　要：新疆甜水海地区石炭纪地层出露较为广泛,其沉积时代的准确限定对研究该地区及西昆仑造山带的地质构造演化具有重要意义。本文通过详细的野外地质调查和剖面测制,在原划归寒武系的甜水湖组中发现大量Protohaploxypinus、Hamiapollenites和Striatolebachiites等可见双囊具肋花粉,与前人建立的新疆晚石炭世晚期的孢粉组合较为相似;在原划归长城系的甜水海岩群中发现牙形刺分子,推测其层位为上石炭统。结合室内区域地层对比研究,本文重新厘定了西昆仑甜水海一带原划归寒武系的甜水湖组及原划归长城系的甜水海岩群(部分)的地质时代,将其划归于上石炭统恰提尔群砂岩组,并结合碎屑组分分析,认为其为三角洲—浅海滨岸相沉积,形成于伸展拉张环境下的被动大陆边缘。The accurate dating of Carboniferous strata,which are widely exposed in the Tianshuihai area,Xinjiang,is of profound importance to study the tectonic evolution of the Tianshuihai area and the West Kunlun orogenic belt.Based on detailed field geological survey and profile survey,a large number of double-banded ribbed pollen(e.g.Protohaploxypinus,Hamiapollenites and Stratolebachiites) are identified in the original Cambrian Tianshuihu Formation,which are similar to the Late Pennsylvanian sporopollen assemblages established by previous authors in Xinjiang.Furthermore,two Pennsylvanian conodonts are found in the original Tianshuihai Group of Changcheng System.Combined with regional stratigraphic comparison,the original Cambrian Tianshuihu Formation and part of the original Tianshuihai Group of Changcheng System in the Tianshuihai area of West Kunlun can be redefined as Pennsylvanian Qiatier Group Sandstone Formation,and combined with component analysis,it’s considered as delta-littoral facies deposits,which were formed in the passive continental margin under the extensional environment.

关 键 词：西昆仑 甜水海 恰提尔群 孢粉化石 牙形刺 

分 类 号：P534.45[天文地球—古生物学与地层学]