摘要
鄂尔多斯盆地西南缘奥陶系出露广泛且分布连续,而有关马家沟组的时代在不同地区存在较大的差异,制约了盆地周缘地层划分和对比。陕西岐山地区崛山剖面的马家沟组上部识别出牙形刺6属10种,属于上奥陶统Belodina compressa带至Belodina confluens带。因此,崛山剖面马家沟组上部的时代为晚奥陶世早—中期。通过对各地区马家沟组的时代对比,发现马家沟组的顶界穿时,范围下至中奥陶统达瑞威尔阶中上部,上达上奥陶统凯迪阶下部。
Six conodont genera and 10 species from the Belodina compressa biozone to the Belodina confluens biozone recognized in the upper part of the Majiagou Formation of the Jueshan section(Shaanxi,southwestern Ordos Basin)indicate that the age of the upper part of the Majiagou Formation in the Qishan area is the Late Ordovician.Correlation of the Majiagou Formation reveals its top boundary is diachronous.In Wuhai,the top boundary of the Majiagou Formation corresponds to the lower Darriwilian(Middle Ordovician),while to the lower Katian(Upper Ordovician)in Yaoxian and Qishan areas.
作者
戴霜
薛春玲
陈中阳
汪卫国
席海雨
田超
DAI Shuang;XUE Chunling;CHEN Zhongyang;WANG Weiguo;XI Haiyu;TIAN Chao(Key Laboratory of Mineral Resources in Western China(Gansu Province)and School of Earth Sciences,Lanzhou University,Lanzhou 730000,China;Key Laboratory of Western China’s Environmental Systems,Ministry of Education and College of Resources and Environment,Lanzhou University,Lanzhou 730000,China;State Key Laboratory of Palaeobiology and Stratigraphy,Nanjing Institute of Geology and Palaeontology and Center for Excellence in Life and Paleoenvironment,Chinese Academy of Sciences,Nanjing 210008,China;Third Institute of Oceanography,Ministry of Natural Resources of China,Xiamen 361005,China)
出处
《微体古生物学报》
CSCD
北大核心
2020年第4期317-327,共11页
Acta Micropalaeontologica Sinica
基金
第二次青藏高原综合科学考察研究(2019QZKK0704)
中央高校基本科研业务费专项资金重点项目(lzujbky-2017-k27)
国家自然科学基金(41972213)联合资助
IGCP652项目“利用多重地层学方法研究古生代沉积岩石记录的地质年代信息”
IGCP653项目“奥陶纪生物大辐射的启动过程”的阶段成果。
关键词
牙形刺
穿时性
马家沟组
上奥陶统
崛山
鄂尔多斯西南缘
conodont
diachroneity
Majiagou Formation
Upper Ordovician
Jueshan
southwestern Ordos Basin
