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Anoxia as the cause of the mid-Early Cambrian (Botomian) extinction event

1996; Geological Society of America; Volume: 24; Issue: 4 Linguagem: Inglês

10.1130/0091-7613(1996)024 2.3.co;2

1943-2682

Andrey Yu. Zhuravlev, Rachel Wood,

Hydrocarbon exploration and reservoir analysis

Research Article| April 01, 1996 Anoxia as the cause of the mid-Early Cambrian (Botomian) extinction event Andrey Yu. Zhuravlev; Andrey Yu. Zhuravlev 1Palaeontological Institute, Russian Academy of Sciences, Profsuyuznaya ul. 123, Moscow 117647, Russia Search for other works by this author on: GSW Google Scholar Rachel A. Wood Rachel A. Wood 2Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EQ, United Kingdom Search for other works by this author on: GSW Google Scholar Geology (1996) 24 (4): 311–314. https://doi.org/10.1130/0091-7613(1996)024 2.3.CO;2 Article history first online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share MailTo Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation Andrey Yu. Zhuravlev, Rachel A. Wood; Anoxia as the cause of the mid-Early Cambrian (Botomian) extinction event. Geology 1996;; 24 (4): 311–314. doi: https://doi.org/10.1130/0091-7613(1996)024 2.3.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract New and revised Early Cambrian biostratigraphic data allow a quantitative analysis of changes in biotic diversity and extinction rate. The mid-Early Cambrian extinction can now be resolved into two distinct events: the well-known early Toyonian Hawke Bay regression event, and a newly observed but more severe disruption during the early Botomian, here named the Sinsk event. During the Sinsk event, the shallow-water benthos of the so-called Tommotian fauna, together with archaeocyaths and some trilobites, underwent a rapid decline. The Sinsk event is characterized by the significant accumulation of nonbioturbated laminated black shales in tropical shallow waters. Lamination is due to the fine alternation of clay- and organic-rich laminae with calcite-rich laminae containing abundant monospecific acritarchs. These shales are enriched by pyrite and elements typical of anoxic conditions and support a benthic biota of dysaerobic character. Our observations suggest that the extinction during the early Botomian was caused by extensive encroachment of anoxic waters onto epicontinental seas, associated with eutrophication and resultant phytoplankton blooms. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.