李奋其等:酒泉早白垩世盆地群构造特征和成因

  文件类型：PDF/Adobe Acrobat   文件大小：字节

更多搜索：李奋其  酒泉  白垩  盆地  构造  特征  成因  
第2期 李奋其等:酒泉早白垩世盆地群构造特征和成因 191
Tectonic Characteristics and Origin of Jiuquan Basin Group
LI Fenqi".WANG Chengshan .WANG Chongxiao.
1)Chengdu Institute of Geology and Mineral Resources,Chengdu,6 1 0082
2)National Key Laboratory of Reservoir Geology and Development,Chengdu,610059
3)Reseach Insititute of Exploration and development,Yumen Oilfield Company,PetroChina,Yumen,Gansu,735200
Abstract
In order to study the origin of NNE—or NE—striking Jiuquan prototype basins,which locate between
northern Qilian orogene of NWW—striking and Alxa block.this paper analysed the tectonic style of Jiuquan
prototype basin group,the basin fills,early Cretaceous volcanic rock and Cenozoic reversible tectonic.The
author initively think that Jiuquan basin group is rift basin of NNE—or NE—striking,and it was resulted from
continental tectonic thermal event which took place in depth in early Cretaceous.During Cenozoic,the pigback
thrust—napping of northern Oilian Mountains,which were caused by the squeenzing of India plate must have
made southern part of Jiuquan basin group to become northern Qilian Mountains;at the same time,the
squeezing action of India plate controlled the basin reversion,in the form of changing the NNE or NE—striking
normal fault which controlled the sedimentation system of secondary tectonic unit in Jiuquan basin group in
early Cretaceous to be thrust fault.In a word,Jiuquan basin group was longer and wider in early Cretaceous
than now.
Key words:rift;normal fault;early Cretaceous;tectonic reverse;nappe structure
中国滇东南早泥盆世坡松冲组的一个石松植物新属种——辐射正理木
(Zhenglia radiata gen.et sp.nov.)及其演化意义
郝守刚",王德明",王祺 ,薛进庄"
1)北京大学地球与空间科学学院造山带与地壳演化重点实验室,100871; 2)中国科学院植物研究所,北京,100093
本文描述了一个产自中国滇东南文山地区坡松冲组(早
泥盆世布拉格期)的新植物属,种一…辐射正理木(Zhenglia
radiata gen.et sp.nov.).这是一个小型草本石松植物.气
生枝分化出营养轴和生殖轴,茎轴上叶迹的排列显示出似鳞
木的叶序.叶迹可能具有叶舌穴,小型叶由突出和下延的基
部和一个全缘的长叶片所组成.生殖轴由螺旋排列的孢子叶
组成,它们形成一个紧密的似孢子叶球的结构.每个孢子叶
具有侧向的延展和远端的叶片.长卵形的孢子囊近轴面着生
在孢子叶上.我们将这个新植物置于原始鳞木目中.考虑到
形态的相似性,特别是未分叉的小型叶具有似鳞木的叶序,
孢子叶聚集成似叶球结构以及近轴面着生的长卵形孢子囊.
讨论了辐射正理木和晚泥盆世及石炭纪的乔木状石松类之
间可能的演化关系.
中国内蒙晚白垩世一新巨龙类
徐星",张晓虹 ,谭庆伟 ,赵喜进",谭琳.
1)中国科学院古脊椎动物与古人类研究所,北京,100044; 2)龙吴地质古生物研究中心,呼和浩特,010010
采自内蒙古上白垩统二连组的一件标本代表巨龙类的
一个新属种.新属种的正型标本包括若干背椎,荐椎和尾椎,
部分背肋和脉弧,以及腰带的大部.新属种的鉴定特征包括
后部背椎椎弓外侧有一源自后关节突的脊,后部背椎有一板
状结构连接椎体一椎体横突板和椎体一前关节突板,前部尾
椎尾肋前伸,有两个凹坑,以及肠骨内侧有一源自耻骨柄的
直立脊 新属种肠骨气腔化,这一特征在蜥脚类恐龙中非常
罕见 新属种具有一套独特的原始和进步特征的组合.初步
的特征分析显示巨龙形类具有非常复杂的特征分布.近期的
巨龙形类化石发现,这一类群在其早期演化阶段在亚洲发生
了一个显著的辐射事件.
维普资讯 http://www.cqvip.com

·上一篇：澳洲帝汶海域瓦肯次盆地源自碳氢化合物的
·下一篇：台北盆地西部由南往北一系列测站之加速度频谱图(垂直向...