globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2014.02.029
论文题名:
Microconchid-dominated cobbles from the Upper Devonian of Russia: Opportunism and dominance in a restricted environment following the Frasnian-Famennian biotic crisis
作者: Zatoń M.; Zhuravlev A.V.; Rakociński M.; Filipiak P.; Borszcz T.; Krawczyński W.; Wilson M.A.; Sokiran E.V.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2014
卷: 401
起始页码: 142
结束页码: 153
语种: 英语
英文关键词: Biotic crisis ; Frasnian-Famennian ; Microconchids ; Mobile rockground ; Paleoecology
英文摘要: Carbonate cobbles from the lower Famennian (crepida conodont Zone) brachiopod shell beds of the Russkiy Brod Quarry (Central Devonian Field, Russia) have been investigated with respect to paleoecology and paleoenvironment. The cobbles, composed of similar shell bioclasts as the host deposits, were eroded from lithified shell beds during intervals of non-deposition. The smooth surfaces and the presence of borings and encrustations on all sides suggest that the cobbles were periodically transported and overturned.The fact that all the bioerosion traces are encrusted and none of the encrusters were bioeroded indicates that the first colonizers of the cobbles were worm-like suspension feeders, leaving long, cylindrical borings (Trypanites). The encrusting organisms are dominated by spirally-coiled microconchid tubeworms, followed by cornulitids, productid brachiopods, hederelloids, foraminifera, enigmatic Ascodictyon and trepostome bryozoans.The high abundance but low-diversity brachiopod fauna and general rarity of such stenohaline taxa as echinoderms in the shell beds or bryozoans on the cobbles suggest that the salinity fluctuated. The presence of dolomite crystals in both the host deposit and cobbles suggests that salinity increased from normal-marine to a higher salinity level during colonization of the cobbles. In fact, as shown by the facies and palynofacies data, the cobble-bearing deposits represent near-shore, restricted environments created during the first phases of transgression of the early Famennian that followed the regional regression at the Frasnian-Famennian transition. In such shallow, restricted settings a higher salinity could have appeared seasonally during a hot and dry climate.As with the microconchids from the aftermath of the end-Permian mass extinction, those from the post-crisis early Famennian interval of Russia were also dominant due to unstable environmental conditions. Here, at least in the case of the Russkiy Brod, the periodic higher salinity episodes may have discouraged other encrusters and thus promoted the settlement of the opportunistic microconchids. © 2014 Elsevier B.V.
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69370
Appears in Collections:过去全球变化的重建

Files in This Item:

There are no files associated with this item.


作者单位: University of Silesia, Faculty of Earth Sciences, Bedzińska 60, PL-41-200 Sosnowiec, Poland; POLARGEO Inc., 3-7 24th-Line, St. Petersburg 199106, Russian Federation; Marine Ecology Department, Institute of Oceanology, Polish Academy of Sciences, Powstańców Warszawy 55, 81-712 Sopot, Poland; The College of Wooster, Department of Geology, Wooster, OH 44691, United States; All Russia Petroleum Research Exploration Institute, 39 Liteyny Pr., St. Petersburg 191014, Russian Federation

Recommended Citation:
Zatoń M.,Zhuravlev A.V.,Rakociński M.,et al. Microconchid-dominated cobbles from the Upper Devonian of Russia: Opportunism and dominance in a restricted environment following the Frasnian-Famennian biotic crisis[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2014-01-01,401
Service
Recommend this item
Sava as my favorate item
Show this item's statistics
Export Endnote File
Google Scholar
Similar articles in Google Scholar
[Zatoń M.]'s Articles
[Zhuravlev A.V.]'s Articles
[Rakociński M.]'s Articles
百度学术
Similar articles in Baidu Scholar
[Zatoń M.]'s Articles
[Zhuravlev A.V.]'s Articles
[Rakociński M.]'s Articles
CSDL cross search
Similar articles in CSDL Cross Search
[Zatoń M.]‘s Articles
[Zhuravlev A.V.]‘s Articles
[Rakociński M.]‘s Articles
Related Copyright Policies
Null
收藏/分享
所有评论 (0)
暂无评论
 

Items in IR are protected by copyright, with all rights reserved, unless otherwise indicated.