【摘要】 新疆准噶尔盆地的白垩系发育较好,其中含有丰富的轮藻化石,计有20属1亚属63种1亚种3变种2比较种1新型2未定种,其中包括7个新种。根据轮藻植物群的演化,可在盆地的南缘、腹部和东北缘建立4个化石带1个亚带和1个组合:Clypeator zongjiangensis带(南缘、腹部及东北缘),时代相当于Berriasian-Valanginian;Flabellochara hebeiensis带(南缘),时代为Barremian;Clypeator jiuquanensis带(腹部),时代为Hauterivian-Bar-remian,其中包含Atopochara trivolvis triquetra亚带,时代为Barremian;Atopochara restricta带(腹部),时代为Cenomanian;Aclistochara mundulavar.elliptica-Raskyaechara gobica-Tolypella grambasti组合(腹部、北部及东北缘),时代应为晚白垩世中、晚期。该组合序列的建立,对确定准噶尔盆地白垩系的年代格架以及与国内外有关地层的对比关系具有十分重要的意义。更多还原

【Abstract】 Sixty-three charophyte species(including 8 new species),one subspecies,3 varieties,2 species conformis,a new type and 2 undetermined species pertinent to 20 genera and one subgenus were found from the outcrops and drills in the well developed Cretaceous strata in the Junggar Basin.Based on the evolution and distribution of charophyte fossils,especially those of the Clavatoraceae,4 fossil zones,a subzone and an assemblage have been recognized in the Junggar Basin,i.e.Clypeator zongjiangensis zone(Berriasian—Valanginian),Flabellochara hebeiensis zone(Barremian),Clypeator jiuquanensis zone(Hauterivian—Barremian age,including the subzone,Atopochara trivolvis triquetra,assigned to Barremian),Atopochara restricta zone(Cenomanian)and Aclistochara mundula var.elliptica-Raskyaechara gobica-Tolypella grambasti assemblage(middle—late Late Cretaceous).They distribute in the southern rim,hinterland,northern part and northern rim of the Junggar Basin.The charophyte sequence established has great significance on determining the age frame of Cretaceous strata in the Junggar Basin and can be correlated internationally.更多还原