An unusual microbial-rostroconch assemblage from the Mulde Event (Homerian, middle Silurian) in Podolia, Western Ukraine

An unusual microbial-rostroconch assemblage from the Mulde Event (Homerian, middle Silurian) in Podolia, Western Ukraine
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乌克兰西部波多利亚穆尔德事件(荷马纪,中志留纪)中的一个不寻常的微生物-头螺组合

DOI:
10.1080/11035897.2013.873988
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发表时间:
2014
期刊:
GFF
影响因子:
1
通讯作者:
Koztowski W.
Koztowski W.
中科院分区:
地球科学4区
文献类型:
--
作者:
Jarochowska E;Munnecke A. ;Koztowski W.

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Homerian(中志留世)Mulde事件是影响半远洋生物的灭绝事件,与正稳定碳同位素漂移和微生物沉积物增殖增加有关。该事件记录在Bagovytsya剖面(Podolia,乌克兰),代表东欧东部的碳酸盐斜坡环境,并记录了δ 13C碳偏移值达到+5.17%。相关的相包括以蓝藻和微问题菌为主的溶瘤岩床、泥丘和血栓堆积,并提出了细菌的亲和性。相关的动物群组合包括高比例的喙壳类和丰富的腹足类和三叶虫。放牧生物和微生物沉积物的共存表明,微生物的保存不是由放牧率下降造成的。
The Homerian (middle Silurian) Mulde Event is an extinction event affecting hemipelagic organisms associated with a positive stable carbon isotope excursion, and an increased proliferation of microbial deposits. The Event is recorded in the Bagovytsya section (Podolia, Ukraine), representing a carbonate ramp setting in the East European Craton, and recording the δ13Ccarbexcursion with values reaching +5.17%. The associated facies include oncolitic beds, mud-mounds and thrombolitic buildups dominated by cyanobacteria and microproblematica with proposed bacterial affinities. The associated faunal assemblage includes a high proportion of rostroconchs and abundant gastropods and trilobites. The co-occurrence of grazing organisms and microbial sediments suggests that the microbial preservation was not caused by decreased grazing rates.
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DOI: --
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