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| DOI | 10.1016/j.palaeo.2019.02.018 |
| Impacts of climate-ocean-tectonic changes on early Paleozoic conodont ecology and evolution evidenced by the Canadian part of Laurentia | |
| Barnes C.R. | |
| 发表日期 | 2020 |
| ISSN | 0031-0182 |
| 卷号 | 549 |
| 英文摘要 | In the Canadian part of Laurentia, large systematic conodont collections were assembled by many specialists over recent decades primarily for lower Paleozoic biostratigraphy, with some having sampling strategies to test ecologic hypotheses. The Laurentian plate straddled the paleoequator and accumulated extensive carbonate deposits, amenable to conodont recovery. In particular, the glaciated and mountainous Canadian part of Laurentia has permitted extensive collections through well-exposed shelf-to-basin transects across continental margins of the Appalachian, Cordilleran and Innuitian (Arctic) orogens, as well as intracratonic sedimentary basins and foreland basins affected by tectonism. From these remarkable settings, integrated studies by specialists of biostratigraphy, evolution, paleoecology, and paleobiogeography, together with oxygen, strontium and neodymium isotope analyses of conodont hard tissues, have involved nearly 700,000 conodonts from over 8000 samples from relatively undeformed stratigraphic sections. The results, with stratigraphic and sedimentologic data, have enabled interpretations of early Paleozoic climatic, oceanographic and eustatic changes and effects of tectonism. The late Cambrian-Early Ordovician exhibits the origin of euconodonts and initial diversification of coniform and ramiform apparatuses. By Middle Ordovician more complex apparatuses evolved with pectiniform (P) elements, with more complex community organization. Responses to sea-level changes can be tracked on both sides of the paleoequator from Cordilleran and Appalachian collections. Middle-Late Ordovician experienced extensive transgressive events, wider carbonate platforms, and the paleogeographic influence of residual Precambrian basement highs that partitioned conodonts into subprovinces. Restricted circulation and hypersalinity in these epeiric seas fostered specialized inshore communities with neurodonts and rhipidognathids. Terminal Ordovician mass extinction event (Gondwanan glaciation) affected forms with elaborate apparatuses whereas many coniform species survived. Slow radiation within the early Rhuddanian (early Silurian) produced community restructuring followed by progressive diversity increase punctuated by minor extinctions, some related to Gondwanan glacial re-advances. Oxygen isotopes show brief paleotemperature perturbations correlated to named episodes and events. Post-Rhuddanian conodont communities were well-defined, laterally segregated, with weak provincialism, and affected by oceanographic events and cratonic amalgamation with closure of the Iapetus Ocean and docking of Baltica, Avalonia and Pearya against Laurentia. © 2019 Elsevier B.V. |
| 英文关键词 | Avalonia; Baltica; Conodont biostratigraphy; Foreland basins; Intracratonic sedimentary basins; Pearya |
| 语种 | 英语 |
| scopus关键词 | Avalonia; biostratigraphy; Cambrian; climate effect; conodont; continental margin; evolution; Iapetus Ocean; Laurentia; mass extinction; Ordovician; paleoceanography; paleotemperature; Precambrian; Proterozoic; Silurian; Appalachians; Arctic; Canada; Rhipidognathidae |
| 来源期刊 | Palaeogeography, Palaeoclimatology, Palaeoecology
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| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/150510 |
| 作者单位 | School of Earth and Ocean Sciences, University of Victoria, PO Box 3065 STN CSC, Victoria, B.C. V8W 3V6, Canada |
| 推荐引用方式 GB/T 7714 | Barnes C.R.. Impacts of climate-ocean-tectonic changes on early Paleozoic conodont ecology and evolution evidenced by the Canadian part of Laurentia[J],2020,549. |
| APA | Barnes C.R..(2020).Impacts of climate-ocean-tectonic changes on early Paleozoic conodont ecology and evolution evidenced by the Canadian part of Laurentia.Palaeogeography, Palaeoclimatology, Palaeoecology,549. |
| MLA | Barnes C.R.."Impacts of climate-ocean-tectonic changes on early Paleozoic conodont ecology and evolution evidenced by the Canadian part of Laurentia".Palaeogeography, Palaeoclimatology, Palaeoecology 549(2020). |
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