{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,12,31]],"date-time":"2025-12-31T08:00:39Z","timestamp":1767168039391,"version":"build-2238731810"},"reference-count":140,"publisher":"Geological Society of London","issue":"1","license":[{"start":{"date-parts":[[2018,11,2]],"date-time":"2018-11-02T00:00:00Z","timestamp":1541116800000},"content-version":"stm-asf","delay-in-days":0,"URL":"https:\/\/doi.org\/10.15223\/policy-002"}],"funder":[{"DOI":"10.13039\/501100000159","name":"Natural Resources Canada","doi-asserted-by":"crossref","id":[{"id":"10.13039\/501100000159","id-type":"DOI","asserted-by":"crossref"}]}],"content-domain":{"domain":["www.lyellcollection.org"],"crossmark-restriction":true},"short-container-title":["JGS"],"published-print":{"date-parts":[[2019,1]]},"abstract":"<jats:p>\n                    At least four horizons of enhanced anoxia (anoxic horizons; AHs) are recognized in the uppermost Eifelian\u2013Middle Frasnian mudrock-dominated strata of the Mackenzie Valley and Peel area of NW Canada. Aluminium-normalized Mo and U logs in two cored sections reveal AH-I at the Eifelian\u2013Givetian boundary, AH-II in basal Frasnian, and AH-III and AH-IV bundled in the Middle Frasnian interval. These four horizons are characterized by attenuated siliciclastic components. Spectral gamma-ray K\u2009+\u2009Th and U are the best tools to trace these horizons in wells and outcrops. AHs are biostratigraphically correlated with \u2018black-shale events\u2019 in several basins of the world. Depositional environment is depicted as a stratified basin where the water-column chemocline defined co-sedimentation of anoxic mudrocks in topographic lows and oxic grey shales and carbonate banks on seafloor elevations. Based on inductively coupled plasma elemental data from 1687 samples, siliciclastic-lean basinal mudrock units that host AHs are strongly enriched in Mo (median EFMo\u2009\u223c\u200997\u2013172\u2005EFMo\/EFU\u2009\u2248\u2009(3\u20133.5)\u2009\u00d7\u2009SW, where EFMo and EFU are respectively Al-normalized Mo and U in enrichment factor notation and SW is average present-day seawater value) compared with siliciclastic-rich units (median EFMo\u2009\u223c\u200917\u201337) and show strong EFU\/EFMo covariation (\n                    <jats:italic>r<\/jats:italic>\n                    \u2009\u2248\u20090.8 in Canol Formation and Bluefish Member). Supported by a lack of geological evidence for an oceanographic barrier, this enrichment indicates unrestricted water exchange with Panthalassa. At the same time, development of oligotrophy is indicated by a lack of P enrichment and weak to non-existent enrichment in Zn and Cu. These features are reconciled through a model by earlier workers that involves a global shift to a warm greenhouse mode with slowed oceanic convection, expanded oxygen minimum zones and a failure of nutrient resupply from the upwelling. The onset of mass degassing in continental large igneous provinces represents a potential trigger for this mid-Devonian shift. Devonian black-shale events in this scenario represent genuine oceanic anoxic events marking hothouse episodes in their nascent form.\n                  <\/jats:p>\n                  <jats:p content-type=\"supplementary-material\">\n                    <jats:bold>Supplementary material:<\/jats:bold>\n                    Details of methods, analytical protocols and data scatterplots, stratigraphic cross-sections showing traceability of anoxic horizons, and inductively coupled plasma elemental and Rock-Eval 6 data used in this study are available at:\n                    <jats:ext-link xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" ext-link-type=\"uri\" specific-use=\"dataset is-supplemented-by\" xlink:href=\"https:\/\/doi.org\/10.6084\/m9.figshare.c.4212428\">https:\/\/doi.org\/10.6084\/m9.figshare.c.4212428<\/jats:ext-link>\n                  <\/jats:p>","DOI":"10.1144\/jgs2018-075","type":"journal-article","created":{"date-parts":[[2018,9,12]],"date-time":"2018-09-12T14:05:13Z","timestamp":1536761113000},"page":"29-45","update-policy":"https:\/\/doi.org\/10.1144\/crossmark-policy","source":"Crossref","is-referenced-by-count":19,"title":["Devonian (\n                    <i>c.<\/i>\n                    388\u2013375\u2005Ma) Horn River Group of Mackenzie Platform (NW Canada) is an open-shelf succession recording oceanic anoxic events"],"prefix":"10.1144","volume":"176","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6289-5351","authenticated-orcid":false,"given":"P.","family":"Kabanov","sequence":"first","affiliation":[]}],"member":"1881","published-online":{"date-parts":[[2018,11,2]]},"reference":[{"key":"e_1_3_3_2_1","doi-asserted-by":"publisher","DOI":"10.4095\/132325"},{"key":"e_1_3_3_3_1","doi-asserted-by":"publisher","DOI":"10.3140\/bull.geosci.1534"},{"key":"e_1_3_3_4_1","first-page":"217","article-title":"The Frasnian\/Famennian boundary in the Southern Urals","volume":"48","author":"Abramova A.N.","year":"2004","unstructured":"Abramova, A.N. & Artyushkova, O.V. 2004. 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