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Acritarchs from the Duolbagáisá Formation (Cambrian Series 2, Miaolingian) on the Digermulen Peninsula, Finnmark, Arctic Norway: towards a high-resolution Cambrian chronostratigraphy
Geological Magazine ( IF 2.3 ) Pub Date : 2020-04-24 , DOI: 10.1017/s001675682000031x Teodoro Palacios , Anette E. S. Högström , Jan Ove R. Ebbestad , Heda Agić , Magne Høyberget , Sören Jensen , Guido Meinhold , Wendy L. Taylor
Geological Magazine ( IF 2.3 ) Pub Date : 2020-04-24 , DOI: 10.1017/s001675682000031x Teodoro Palacios , Anette E. S. Högström , Jan Ove R. Ebbestad , Heda Agić , Magne Høyberget , Sören Jensen , Guido Meinhold , Wendy L. Taylor
New information on acritarchs from the Duolbagáisá Formation, Digermulen Peninsula, Arctic Norway, enable recognition of the three Cambrian Series 2 acritarch-based zones: the Skiagia ornata –Fimbriaglomerella membranacea , Heliosphaeridium dissimilare –Skiagia ciliosa and Volkovia dentifera –Liepaina plana Assemblage z ones. Acritarchs of the Skiagia ornata –Fimbriaglomerella membranacea Zone (Cambrian Stage 3) appear near the base of the unit, close to an undetermined trilobite. In the Upper Member of the Duolbagáisá Formation, in levels with Kjerulfia n. sp. and Elliptocephala n. sp., appears an assemblage with abundant Skiagia ciliosa , indicative of the Heliosphaeridium dissimilare –Skiagia ciliosa Zone. A few metres higher appear Liepaina plana , Heliosphaeridium notatum and Retisphaeridium dichamerum , which indicate the Volkovia dentifera –Liepaina plana Zone (Cambrian Stage 4). The transition between the Duolbagáisá Formation and the overlying Kistedalen Formation is marked by the appearance of Comasphaeridium longispinosum , Multiplicisphaeridium llynense and Eliasum llaniscum , diagnostic of the Miaolingian Series. This coincides with the disappearance of Skiagia ; occurrences of Skiagia in Miaolingian strata consist of reworked material related to the Hawke Bay regression at the Cambrian Stage 4–Wuliuan transition. The absence of Skiagia in higher levels of the Duolbagáisá Formation and Kistedalen Formation suggests that no unconformity formed during the Hawke Bay regression in this area. The chronostratigraphical significance of the Skiagia ornata –Fimbriaglomerella membranacea , Heliosphaeridium dissimilare –Skiagia ciliosa and Volkovia dentifera –Liepaina plana zones is critically analysed. Correlation of the Duolbagáisá Formation with peri-Gondwanan terrains of Avalonia and Iberia is established. The Digermulen Peninsula has great potential as a reference section for establishing a Cambrian chronostratigraphy based on acritarchs.
中文翻译:
来自挪威北极芬马克 Digermulen 半岛的 Duolbagáisá 组(寒武纪系列 2,苗岭期)的 Acritarchs:迈向高分辨率寒武纪年代地层学
来自挪威北极 Digermulen 半岛 Duolbagáisá 组的新信息使我们能够识别三个基于寒武纪系列 2 的 acritarch 区域:凤尾鱼 –膜球菌 ,异日球藻 –仙人掌 和牙草 –平纹鳖 装配z 那些。Acriarchs 的凤尾鱼 –膜球菌 区域(寒武纪第 3 阶段)出现在单元底部附近,靠近未确定的三叶虫。在 Duolbagáisá 组的上段,在与菊苣 n. sp。和椭圆头目 n. sp.,出现了一个丰富的组合仙人掌 , 表示异日球藻 –仙人掌 区。高出几米出现平纹鳖 ,日葵 和球藻 ,这表明牙草 –平纹鳖 区(寒武纪第 4 阶段)。Duolbagáisá 组和上覆的 Kistedalen 组之间的过渡以长刺球囊菌 ,多头球菌 和大白菜 , 诊断妙龄系列。这恰逢其消失斯基亚亚 ; 的发生斯基亚亚 苗岭期地层由寒武纪第四期-五六过渡期霍克湾回归相关的返工材料组成。的缺席斯基亚亚 在 Duolbagáisá 组和 Kistedalen 组的较高层次表明,该地区霍克湾回归期间没有形成不整合。年代地层学意义凤尾鱼 –膜球菌 ,异日球藻 –仙人掌 和牙草 –平纹鳖 区域进行了批判性分析。建立了 Duolbagáisá 组与 Avalonia 和 Iberia 的冈瓦南周边地形的相关性。Digermulen 半岛具有巨大的潜力,可作为建立基于 acritarchs 的寒武纪年代地层学的参考剖面。
更新日期:2020-04-24
中文翻译:
来自挪威北极芬马克 Digermulen 半岛的 Duolbagáisá 组(寒武纪系列 2,苗岭期)的 Acritarchs:迈向高分辨率寒武纪年代地层学
来自挪威北极 Digermulen 半岛 Duolbagáisá 组的新信息使我们能够识别三个基于寒武纪系列 2 的 acritarch 区域: