西准噶尔晚志留世、早泥盆世孢子和疑源类

LATE SILURIAN-EARLY DEVONIAN SPORES AND ACRITARCHS FROM WEST JUNGGAR

新疆西准噶尔沙尔布尔提山晚志留世、早泥盆世孢子和疑源类包括孢子21属31种和变种,其中新种1个(Amicosporites xinjiangensis);疑源类11属14种。此外还有几丁虫3属3种。根据孢子在地层中分布规律和演化特征,自下而上可划出4个孢子带:1.Synorisporites dittonensis—Api-culiretusispora spicula(DS)带;2.Emphanisporites micrornatus—Streelispora newportensis(MN)带;3.Chelinospora cassicula—Perotriletes subitus(CS)带;4.Grandispora sp.—Apiculatasporites micro-conus(CM)带;上述孢子组合基本上可与中国华南、西南、西秦岭及有关国家、地区相同时代孢子带对比。根据孢子和疑源类材料,对西准噶尔志留—泥盆系界线、古地理和古生态进行了讨论。

The spores and acritarchs under discussions include 21 genera 31 species of spores. 11 genera and 14 species of acritarchs,and 3 genera and 3 species of chitinozoa. The four spore zones are subdivided based onthe distribution regularities and evolution features. They are: 1. Synorisporites dittonensis - Apiculiretusispora spicula(.DS)zone;2. Emphanisporites micrornatus-streelispora newportensis(MN) zone;3.Chelinospora cassic-ula - Perotriletes subitus zone. 4. Grandisproa sp. -Apiculatasporites microconus (CM) zone. The above spore assemblage can be basically correlated with those of South China, Southwest China, West Qingling and associated countries and regions. The Silurian-Devonian boundary,the paleogeography and paleoecology were also discussed.