摘要
山东基岩区三叠系一直缺少生物化石依据。前人在该套地层底部发现了铱等元素异常 ,认为可作为划分其地质时代的依据。笔者在 1∶2 5万淄博市幅区域地质调查中 ,于该地层中首次发现了孢粉化石 ,结合前人铱等异常特征 ,经区域对比确定其形成于早 -中三叠世 ,并认为区内孙家沟组相当于华北地区的和尚沟组 。
There is a shortage of biotic fossil evidence in the Triassic strata in Shandong province for a long time. Some elementary anomalies of iridium have been found at the bottom of the strata, and it can be used to distinguish it's forming time. The sporopollen fossils have been found in the Triassic at the first time during the 1∶250 000 geological survey in this area. Combined with the character of the elementary anomalies of iridium, it is suggested that the strata came into being in early-middle Triassic period. And that Sunjiagou formation is correspondent with Heshanggou formation in North China, while Liujiagou formation is correspondent with Er'maying formation.
出处
《地质调查与研究》
2004年第4期223-227,共5页
Geological Survey and Research
基金
国土资源大调查项目 1:2 5万淄博市幅区域地质调查项目 (2 0 0 1130 0 0 0 2 6 )
关键词
山东
三叠系
孢粉化石
铱等元素异常
Shandong Province
Triassic
sporopollen fossils
elementary anomalies of iridium
