Development of a Standard Biostratigraphic Reference Section for the Silurian Cape Phillips Formation, Canadian Arctic

摘要：加拿大北极志留系菲利普斯角组生物地层学标准参考剖面的建立这项研究建议通过收集和分析加拿大北极菲利普斯角组盆地海相地层中的放射虫原始剖面中的放射虫来提高志留系放射虫生物地层学的地位。放射虫数据将与其他有用的生物地层学和地球化学数据相结合，其目标是1)为菲利普斯角盆地建立一个综合生物地层标准，以及2)校准似乎具有全球生物地层学意义的放射虫数据。这项研究将产生有史以来为志留纪放射虫产生的最全面和校准最好的数据集，并将对更好地控制世界各地造山带复杂变形和年代不佳的盆地序列的年龄具有重要意义。放射虫和笔石将从德文岛和康沃利斯群岛的文洛克-路德洛维安地层的至少三个部分采集，并与PI和她的合作者A.C.Lenz博士在过去野外季节采集的其他六个兰多维利亚-卢德洛夫地层段相结合。笔石得到了很好的研究，并作为生物地层对比和时代控制的基础。1999年碳同位素地球化学的初步研究表明，至少有两个正漂移可以作为化学地层基准，并与古生物数据相结合。将在更多的剖面上进行同位素地球化学，以进一步确定这些化学地层学数据的可靠性和范围。

ABSTRACT:Development of a Standard Biostratigraphic Reference Section for the Silurian Cape Phillips Formation, Canadian ArcticPaula J. NobleEAR-0107139This study proposes to advance the status of Silurian radiolarian biostratigraphy through the collection and analysis of radiolarians from well-dated pristine sections of basinal marine strata in the Cape Phillips Formation, Canadian Arctic. Radiolarian data will be integrated with other useful biostratigraphic and geochemical datums with the goals of 1) generating a composite biostratigraphic standard for the Cape Phillips Basin, and 2) calibrating radiolarian datums that appear to have global biostratigraphic significance. This study should produce the most comprehensive and best calibrated data set ever generated for Silurian radiolarians and will be of fundamental importance in providing better age control for complexly deformed and poorly dated basinal sequences in orogenic belts around the world. Radiolarians and graptolites will be collected from at least three sections of Wenlockian - Ludlovian Strata on Devon and Cornwallis Islands and combined with six other Llandoverian-Ludlovian sections sampled by the PI and her collaborator, Dr. A. C. Lenz, during past field seasons. The graptolites are well studied and serve as the basis for biostratigraphic correlation and age control. A 1999 pilot study of carbon isotope geochemistry shows that there are at least two positive excursions that may serve as chemostratigraphic datums that may be integrated with the paleontologic data. Isotope geochemistry will be conducted on additional sections to further determine the reliability and extent of these chemostratigraphic datums.