气候变化领域集成服务门户(CCPortal): Genesis; modification; and preservation of complex Upper Ordovician hardgrounds: Implications for sequence stratigraphy and the Great Ordovician Biodiversification Event

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DOI	10.1016/j.palaeo.2019.04.011
	Genesis; modification; and preservation of complex Upper Ordovician hardgrounds: Implications for sequence stratigraphy and the Great Ordovician Biodiversification Event
	Paton T.R.; Brett C.E.; Kampouris G.E.
发表日期	2019
ISSN	0031-0182
起始页码	53
结束页码	71
卷号	526
英文摘要	Hardgrounds from the Upper Ordovician strata of eastern Laurentia exhibit a wide range of morphologies, though the development of their complex surface topographies remains poorly understood. These early lithified seafloors, which can be laterally very extensive, may provide key information about basin dynamics and global ocean fluctuations. Based on spectacular exposures and newly-excavated material, we examined a suite of hardgrounds from the Upper Ordovician (Katian)of southern Ontario and the Cincinnati Arch region and documented the processes of genesis, development, and modification of simple, complex, and block hardgrounds. In this study, we used extensive field work, petrology, and cathodoluminescence to determine the evolution and shaping of hardgrounds as a result of intense submarine erosion and prolonged exposure of these surfaces and reveal a progression from simple to complex hardgrounds and ultimately to isolated cobble- to boulder-sized block hardgrounds. We survey the distribution of hardgrounds in a sequence stratigraphic framework to determine allocyclic controls on hardground development, highlight the important role that mixed siliciclastic-carbonate environments play in promoting the development of heterogeneous hardground topographies, and analyze the effects of high surface reliefs on local depositional and erosional regimes. In addition, we interpret the impact of increasingly abundant complex hardgrounds throughout the Ordovician on hard-substrate community diversification and their contribution to the Great Ordovician Biodiversification Event. We also discuss time-specific aspects of the Late Ordovician that made it a peak interval of hardground proliferation. © 2019 Elsevier B.V.
英文关键词	Early diagenesis; Encrusting communities; Kirkfield Formation; Submarine erosion; Substrates; Synsedimentary cementation
语种	英语
scopus关键词	diagenesis; global ocean; Laurentia; morphology; Ordovician; seafloor; sequence stratigraphy; siliciclastic deposit; substrate; Cincinnati; Ohio; United States
来源期刊	Palaeogeography, Palaeoclimatology, Palaeoecology
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/150956
作者单位	Department of Earth and Planetary Sciences, University of Tennessee, Knoxville, TN 37996, United States; Department of Geology, University of Cincinnati, Cincinnati, OH 45221, United States; Cincinnati Museum Center, 1301 Western Avenue, Cincinnati, OH 45203, United States
推荐引用方式 GB/T 7714	Paton T.R.,Brett C.E.,Kampouris G.E.. Genesis; modification; and preservation of complex Upper Ordovician hardgrounds: Implications for sequence stratigraphy and the Great Ordovician Biodiversification Event[J],2019,526.
APA	Paton T.R.,Brett C.E.,&Kampouris G.E..(2019).Genesis; modification; and preservation of complex Upper Ordovician hardgrounds: Implications for sequence stratigraphy and the Great Ordovician Biodiversification Event.Palaeogeography, Palaeoclimatology, Palaeoecology,526.
MLA	Paton T.R.,et al."Genesis; modification; and preservation of complex Upper Ordovician hardgrounds: Implications for sequence stratigraphy and the Great Ordovician Biodiversification Event".Palaeogeography, Palaeoclimatology, Palaeoecology 526(2019).