摘要
宝鸡长寿沟剖面系渭河北岸五级阶地第四纪堆积物。阶地基座为上第三系上中新统蓝田组红层。在该剖面采集了62组古地磁样品,经古地磁测定B/M界限位于L_8底部,贾拉米洛正极性亚带位于S_(10)至S_(11)地层段;长寿沟渭河五级阶地形成于1.3Ma左右。
The Changshougou section in Baoji was made through the Quaternary accumulation materials at the fifth—order tarrace on the north bank of the Weihe River, and its basement is the red beds of the Upper Miocene Lantian Formation of the Teritary system. The results of paleomagnetic survey of 62 groups of specimens collected from the section proved the B/M interface lying in the bottom of the L<sub>8</sub> and the Jaramillo polarity subzone lying in the S<sub>10</sub> and S<sub>11</sub> stratomeres. From the peleomegnetic dating, the writer inferred that the formational time of the Weihe fifih—order terrace in Changshougou is 1.3Ma.
出处
《陕西地质》
1992年第1X期53-59,共7页
Geology of Shaanxi
关键词
宝鸡
渭河五级阶地
古地磁年龄
Baoji
the Weihe fifth—order terrace
paleomagnetic dating
