摘要
目的探讨西秦岭礼县上石炭统下加岭组牙形刺化石的分布规律,进而建立该区牙形刺序列,以便进行区域划分和对比。方法依据下加岭组牙形刺化石的产出特征建立牙形刺序列。结果下加岭组的牙形刺序列(自下而上)可划分为:Declinognathodus noduliferus noduliferus-Idiognathoidessinuatus组合带;Idiognathodus delicates-Neognathodus bassleri-Neogondolella clarki组合带;Streptognathodus suberectus-S.parvus-S.gracilis组合带。结论该区牙形刺序列可与中国华南的罗苏阶、滑石板阶、达拉阶(威宁阶)对比,属于晚石炭世早期。该区牙形刺序列的建立对西秦岭地区石炭纪地层的划分对比有着重要意义。
Aim To discuss the conodont distribution law of the Upper Carboniferous from Xiajialing formation, Lixian, Gansu, West Qinling, and establish the eonodont sequences for Carboniferous strata elassifieation and correlation. Methods Based on observation of conodont distribution character of Xiajialing formation, conodont sequences are established. Results The eonodont sequences of Xiajialing formation ean be subdivided, in the ascending order, into： Declinognathodus noduliferus noduliferus-ldiognathoides sinuatus assemblage zone, Idiognathodus delicates-Neognathodus bassleri-Neogondolella clarki assemblage zone and Streptognathodu, suberectus-S, parvu,- S. gracilis assemblage zone. Conclusion The conodont sequences can be correlated with the Luosuan, Huashibanian and Dalaan of South China, and belong to the early stage of Late Carboniferous. The building of the Upper Carboniferous eonodont sequences will be of significance for the study of Carboniferous strata elassifieation and correlation of the West Qinling.
出处
《西北大学学报（自然科学版）》
CAS
CSCD
北大核心
2010年第4期679-684,I0001,I0002,F0003,共9页
Journal of Northwest University（Natural Science Edition）
基金
中国铝业公司公益性区域地质矿产调查基金资助项目(200801)
中国地质调查局区域地质调查基金资助项目(200013000154)
关键词
牙形刺序列
上石炭统
礼县
西秦岭
conodont sequences
Upper Carboniferous
Lixian
West Qingling
