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

摘要/ ABSTRACT摘要：建立加拿大北极志留系菲利普斯角组标准生物地层学参考剖面，旨在通过对加拿大北极菲利普斯角组海相地层原始剖面放射虫的采集和分析，进一步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和地球化学数据相结合，目标是1)为菲利普斯角盆地生成复合生物地层标准；2)校准具有全球生物地层意义的放射虫数据。该研究将为志留系放射虫提供最全面、最好的校准数据集，并将对世界各地造山带复杂变形和年代不确定的盆地序列提供更好的年龄控制具有重要意义。放射虫和笔石将从德文岛和康沃利斯岛的温洛克纪-勒德洛夫纪地层的至少三个剖面中收集，并与PI和她的合作者A. C. Lenz博士在过去的野外季节取样的其他六个llandovian -Ludlovian剖面相结合。对笔石进行了充分的研究，为生物地层对比和年龄控制提供了依据。1999年的碳同位素地球化学初步研究表明，至少有两个积极的偏移可以作为化学地层资料，可以与古生物资料相结合。同位素地球化学将在其他剖面上进行，以进一步确定这些化学地层基准的可靠性和范围。

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.