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首页> 外文期刊>Geologica Carpathica >Oligocene dinoflagellate cysts from the North Alpine Foreland Basin: New data from the Eggerding Formation (Austria)
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Oligocene dinoflagellate cysts from the North Alpine Foreland Basin: New data from the Eggerding Formation (Austria)

机译：北高山前陆盆地的渐新世二鞭毛囊肿：来自Eggerding组的新数据（奥地利）

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摘要

In spite of detailed geological and geophysical investigations, information available on palynostratigraphy for the successions deposited in the Austrian part of the North Alpine Foreland Basin (NAFB) is scanty. For the first time, relatively diverse and well preserved Oligocene dinocyst assemblages, comprising 53 genera and 138 species, are presented from the organic-rich sediments of the Eggerding Formation. These assemblages contribute to the biostratigraphy of the Oligocene deposits within the NAFB. Dinocysts such as Chiropteridium lobospinosum, Membranophoridium aspinatum, Cordosphaeridium spp., Enneadocysta spp., Deflandrea spp., Spiniferites/Achomosphaera group, Hystrichokolpoma spp., Apteodinium spp., Glaphyrocysta/Areoligera complex and Wetzeliella spp. represent the main palynological elements. The occurrence of Chiropteridium spp., Tuberculodinium vancampoae, Distatodinium biffii and Wetzeliella gochtii is of particular importance for regional correlations within the Lower Oligocene sediments. A comparison with age-controlled assemblages from the North Sea Basin, Carpathian and circum-Mediterranean regions substantiate the attribution to the Rupelian. Lack or sporadic occurrence of the oceanic taxa (e.g. Nematosphaeropsis and Impagidinium) and dominance of Glaphyrocysta/Areoligera indicate an inner-neritic marine setting during the deposition of the studied intervals. Although, it is difficult to reconstruct precisely the climatic conditions based on the recorded dinocysts, warm? sea surface water is suggested. A variation in salinities is interpreted based on the abundances of Homotryblium spp. The abundance of Peridiniaceae taxa (e.g. Lejeunecysta, Wetzeliella, and Deflandrea) indicates nutrient-rich surface water.
机译：尽管进行了详细的地质和地球物理调查，但有关沉积在北高山前陆盆地（NAFB）奥地利部分的演替的古地层学信息仍然很少。首次从埃格丁组富含有机物的沉积物中发现了相对多样且保存完好的渐新世二齿囊组合，包括53属和138种。这些组合有助于NAFB内渐新世沉积物的生物地层学。扁囊藻，菱形膜虫，线虫属，线虫属，Deflandrea属，棘孢石/无鳞藻类，Hystrichokolpoma菌种，Apetodinium菌种，Glasphyroslasa / Atzoliella藻类。代表主要的古生物学要素。对于渐新世下层沉积物中的区域相关性而言，手鳞蝶属，vancampoae结核菌，biffii双歧杆菌和Wetzeliella gochtii的发生特别重要。与来自北海盆地，喀尔巴阡和地中海外围地区的年龄控制的组合进行比较，证实了归因于Rupelian。缺乏或零星出现的海洋分类群（例如线虫和凤尾兰）和优势的囊藻/疏毛藻表明在研究间隔的沉积过程中内部有一个海床。虽然，很难根据记录的狄诺氏囊精确地重建气候条件，但温暖吗？建议使用海表水。盐度的变化是基于单孢菌属物种的丰富度来解释的。百里香科类群的丰富（例如Lejeunecysta，Wetzeliella和Deflandrea）表明营养丰富的地表水。

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