陕西渭南宋家北沟新近纪/第四纪三门组介形类化石研究  

Study on the Neogene-Quaternary ostracoda fossils of Sanmen Formation in Songjiabeigou,Weinan,Shaanxi

作　　者：王焯[1] 王平[2] 王曦[1] 

机构地区：[1]中国地质大学(北京)地球科学学院,北京100083 [2]长安大学资源学院,陕西西安710054

出　　处：《西安石油大学学报（自然科学版）》2010年第1期35-40,44,共7页Journal of Xi’an Shiyou University（Natural Science Edition）

摘　　要：基于对陕西渭南宋家北沟露头剖面的实测,详细描述了新近纪/第四纪三门组的岩性地层及介形化石的垂向分布特征和化石组合划分,鉴定出介形类化石12属27种,识别了线星介-骊山介组合(Lineocypris-Lishania Assemblage)及土星介-小玻璃介组合(Ilyocypris-Candoniella Assemblage).通过介形类化石电镜扫描观察,对其中最具代表性的介形类化石做了壳体表面纹饰研究,划分出多边形近圆网纹纹饰、圆窝形网纹纹饰、锯齿形网纹纹饰、线条状条纹类型、指纹状条纹类型和斑点状纹饰6种类型.Based on the measurement of the outcrop section in Songjiabeigou,the lithologic strata and the vertical distribution feature of the Neogene-Quaternary ostracoda fossils of the Sanmen Formation are described in detail.And 12 genera 27 species of ostracoda fossils are identified,they are classified into Lineocypris-Lishania Assemblage and Ilyocypris-Candoniella Assemblag.Based on the study on the surface ornamentation of the representative fossils by using SEM,the ornamentation is classified into six kinds,which enriches the research of ostracoda shell surface ornamentation.

关 键 词：三门组 新近耋己/第四纪 介形类化石 壳表纹饰 

分 类 号：P534.6[天文地球—古生物学与地层学]