新疆阿合奇县石炭系别根他乌组孢粉化石的发现及地质意义  

Discovery of Sporopollen Fossils of Carboniferous Biegengtawu Formation in Aheqi,Xinjiang,and Its Paleoclimate Significance

作　　者：王庆同[1,2,3] 陈伟[1,2] 马锦龙[1,2] 杨宝忠[4] 张新勇[3] 阎琨[3] 张维昕[3] 柳晓丹[3] 

机构地区：[1]兰州大学地质科学与矿产资源学院,兰州730000 [2]兰州大学甘肃省西部矿产资源重点实验室,兰州730000 [3]中国人民武装警察部队黄金第七支队,山东烟台264004 [4]中国地质大学(武汉)地球科学学院,武汉430074

出　　处：《地质科技情报》2017年第3期1-6,共6页Geological Science and Technology Information

基　　金：中国地质调查局地质调查项目"新疆1:5万卡克;色帕巴衣幅区域地质矿产调查"(1212011220661);"新疆哈拉奇地区区域地质矿产调查"(1212011120495)

摘　　要：新疆阿合奇县色帕巴衣地区石炭系别根他乌组底部首次发现了大量孢粉化石,经鉴定计有38属65种,根据化石属种类型及占比,将孢粉组合命名为Protohaploxypinus-Potonieisporites-Hamiapollenites组合。该组合以双囊具肋花粉的大量出现,Protohaploxypinus,Potonieisporites,Hamiapollenites的高占比,Striatolebachiites和Noeggerathiopsidozonotrilete的低占比以及Cordaitina的出现为特征,与前人建立的新疆上石炭统车排子组孢粉组合极为相似,而与前人建立的巴塔玛依内山组中的孢粉组合有显著区别,故当前孢粉组合代表的地质时代应为晚石炭世早中期的罗苏期至滑石板期,相当于国际上Bashkirian-Moscovian(巴什基尔-莫斯科)期早期。其植物化石兼具欧美区与安加拉区特征,整体上处于亚安加拉区。孢粉证据支持塔里木板块与准噶尔板块的部分拼接最晚发生在晚石炭世早期的假说。气候总体上处于半干旱气候,但干旱程度并不严重,局部层位还形成薄煤层或煤线。Abudant sporopollen fossils, including 38 genera and 65 species are found for the frist time in the lower part of Carboniferous Biegengtawu Formation in Sepabayi area, Aheqi county, Xinjiang. According to the characteristics and percentage of the sporopollen fossil species, the sporopollen assemblage is named Protohaploxypinus-Potonieisporites-Hamiapollenites. The combination is characterized by a large number of double-banded ribbed pollen, high content of Protohaploxypinus, Potonieisporites and Hamiapolleni- tes, low content of Striatolebachiites and Noeggerathiopsidozonotrilete with the presence of Cordaitina. The palynological assemblage corresponds to the Late Carboniferous sporopollen assemblage of the Chepai- zi in Xinjiang established by predecessors, and it is significantly different from the sporopollen assemblage of the Batamayineishan Formation. So the age of sporopollen assemblage belongs to the Luosuan Stage to the Huashibanian Stage , the Early-mid term of Late Carboniferous , the equivalent of the international Bashkirian- Moscovian period. Its plant both have the Euramerican Province and the Angaran Province characteristics, and should belong to Subangaran Province. The evidence of the sporopollen to support the hypothesis that Tarim plate and the Junggar plate part of the splicing occurred earlier than the Late Car- boniferous. The climate was generally semi-arid, but the degree of drought was not severe, with partly found thin coal seams or coal lines.

关 键 词：孢粉 石炭纪 别根他乌组 塔里木盆地 新疆 

分 类 号：Q913.84[天文地球—古生物学与地层学]