中国地质调查2025，Vol.12Issue(5)：47-56,10.DOI:10.19388/j.zgdzdc.2024.290
青海省北巴颜喀拉山优云地区下—中三叠统甘德组的时代约束:来自牙形石的化石证据
Age constraints of the Lower-Middle Triassic Gande Formation in the northern Bayankala Mountain of Youyun area in Qinghai Province:Evidence from conodonts
摘要
Abstract
The tectonic setting of the northern Bayankala Mountain in Youyun area is located in the eastern seg-ment of the Paleo-Tethys Ocean.Gande Formation of Bayankala Group developed in this area is a flysch forma-tion primarily composed of sandstone and slate,with relatively homogeneous lithological assemblages.Meanwhile,the age of this formation remains highly controversial due to the lack of reliable biostratigraphic evidence.A meas-ured section of Gande Formation was conducted to count the conodonts discovered in the section,which belongs to 11 genera and 14 species.A conodonts assemblage zone Hindeodella suevica-Nicoraella kockeli,with significant stratigraphic age-discriminative value,was identified to fill the biostratigraphic information gap of Gande Forma-tion in this region.The age of Gande Formation in Yunyou area of the northern Bayankala Mountains has been precisely constrained to the Late Olenekian Period of Early Triassic to middle Anisian Period of Middle Triassic.The research could provide references for the delineation of stratigraphic sequence in this region.关键词
北巴颜喀拉山/巴颜喀拉山群/甘德组/牙形石/地层对比/生物地层Key words
the northern Bayankala Mountain/Bayankala Mountain Group/Gande Formation/conodonts/strati-graphic correlation/biostratigraphy分类
地质学引用本文复制引用
周霖,郑若蕾,孟勇,王鹏,祁尧刚,李得忠..青海省北巴颜喀拉山优云地区下—中三叠统甘德组的时代约束:来自牙形石的化石证据[J].中国地质调查,2025,12(5):47-56,10.基金项目
中国地质调查局"祁连成矿带金矿资源潜力动态评价(编号:DD20220979)"及"东昆仑成矿带金矿资源潜力动态评价(编号:DD20220978)"项目联合资助. （编号:DD20220979）
