CAJ | 학술논문

2014年全国地层委员会最新出版的《中国地层表》中正式采用了将上中新统两分为灞河阶和保德阶的方案。“灞河”一名源自同名岩石地层单位灞河组,典型剖面位于陕西省蓝田县灞河左岸的水家嘴。灞河阶对应于国际地层表中海相的托尔托纳阶,其共同的底界定义为古地磁Chron C5r.2n的底部,年龄为11.6 Ma,这条界线在蓝田地区的灞河组并不存在。在中国晚中新世早期的哺乳动物群中,甘肃临夏盆地的郭泥沟动物群、大深沟动物群,青海柴达木盆地的托素动物群、深沟动物群,内蒙古苏尼特右旗的阿木乌苏动物群,西藏比如盆地的布隆动物群,陕西府谷的喇嘛沟动物群和云南元谋的小河动物群均属于灞河期。甘肃省东乡县的郭泥沟剖面是灞河阶底界层型最有利的候选剖面。
2014년전국지층위원회최신출판적《중국지층표》중정식채용료장상중신통량분위파하계화보덕계적방안。“파하”일명원자동명암석지층단위파하조,전형부면위우합서성람전현파하좌안적수가취。파하계대응우국제지층표중해상적탁이탁납계,기공동적저계정의위고지자Chron C5r.2n적저부,년령위11.6 Ma,저조계선재람전지구적파하조병불존재。재중국만중신세조기적포유동물군중,감숙림하분지적곽니구동물군、대심구동물군,청해시체목분지적탁소동물군、심구동물군,내몽고소니특우기적아목오소동물군,서장비여분지적포륭동물군,협서부곡적나마구동물군화운남원모적소하동물군균속우파하기。감숙성동향현적곽니구부면시파하계저계층형최유리적후선부면。
In 2014, the National Commission on Stratigraphy of China formally suggested dividing the Chinese Upper Miocene Series into the Bahean Stage and Baodean Stage in the newly published “Chinese Stratigraphical Chart”. The name “Bahe” is derived from the lithostratigraphic unit Bahe Formation, and its typical section is located at Shuijiazui on the left bank of the Bahe River in Lantian County, Shaanxi Province. The Bahean Stage is correlated to the marine Tortonian Stage in the International Stratigraphical Chart, and they share the same definition of the lower boundary at the bottom of the paleomagnetic Chron C5r.2n, with an age of 11.6 Ma. At the Shuijiazui section in the Lantian area, this boundary is missing. Among the early Late Miocene mammalian faunas in China, the Guonigou and Dashengou faunas from the Linxia Basin in Gansu, the Tuosu and Shengou faunas from the Qaidam Basin in Qinghai, the Amuwusu fauna from Sonid Right Banner, Inner Mongolia, the Bulong fauna from the Biru Basin in Tibet, the Lamagou fauna from Fugu, Shaanxi, and the Xiaohe fauna from the Yuanmou Basin in Yunnan are correlated to the Bahean Age. The Guonigou section in Dongxiang, Gansu is the most advantageous candidate stratotype of the lower boundary of the Bahean Stage.