Multidisciplinary Investigation of Late Cretaceous and Paleogene Stratigraphic Sequences of the High Arctic

智力价值：数值模拟和实验室模拟表明，地球发电机的动力学在相切圆柱体的内部和外部是不同的，这个假想的圆柱体平行于地球的自转轴，与固体内核相切。高北极提供了一个理想的机会，通过收集古地磁和古强度数据来研究这些过程。首席研究员最近发现了晚白垩世北极熔岩记录的地磁反转转变（该地点在熔岩就位期间正好位于切线圆柱体内）。他将对这一偶然事件进行取样，以定义前、后和过渡场。方向将基于整个岩石样本的古地磁分析，以及从熔岩中分离出的单斜长石晶体的Thellier分析的古强度。这些岩石对于了解北冰洋的构造演化、其边缘、与高北极（斯特兰德峡湾）大火成岩省的潜在联系以及地幔柱的作用也很重要。最后，来自同一地层序列的脊椎动物化石提供了重要的极地古气候信息。首席研究员将对这些主题进行多学科研究，这些主题通过一种共同的实地方法联系在一起：对定义明确的高北极地层剖面进行高分辨率采样。将对火山岩进行采样，以进行古地磁学、地质年代学和地球化学研究，同时将收集化石，以更好地表征晚白垩世-古近纪极地温度。首席研究员预计，在切向圆柱体内的熔岩中记录的地磁反转的定义将引起对核心过程感兴趣的广泛科学家的兴趣，而进一步确定这些岩石的性质和年龄对于那些对北冰洋及其边缘的构造发展感兴趣的人来说将是重要的。此外，与这些火山岩有关的脊椎动物化石的研究将对古气候界产生兴趣。该项目将支持博士学位。论文和几个本科生的研究。本科生通常参加实地工作，许多人通过独立的研究项目和本科毕业论文在实验室进行样品分析。他还计划通过向北极（努纳武特）社区介绍调查结果来开展外联活动。

ABSTRACT TardunoOPP-06212379Intellectual merit: Numerical and laboratory simulations suggest that thedynamics of the geodynamo differ inside and outside the tangent cylinder, that imaginary cylinder parallel to Earth's spin axis and tangent to the solid inner core. The High Arctic provides an ideal opportunity to investigate such processes through the collection of paleomagnetic and paleointensity data. The Principal Investigator has recently discovered a geomagnetic reversal transition recorded by Late Cretaceous Arctic lavas (the site was well within the tangent cylinder during emplacement of the lavas). He will sample this fortuitous occurrence to define the pre, post, and transitional field. Directions will be based on paleomagnetic analyses of whole rock samples, and paleointensity on Thellier analyses of single plagioclase crystals separated from the lavas. These rocks are also important for understanding the tectonic evolution of the Arctic Ocean, its margins, the potential connection with the High Arctic (Strand Fiord) large igneous province and the role of mantle plumes. Finally, vertebrate fossils from the same stratigraphic sequences have yielded important polar paleoclimate information. The Principal Investigator will conduct a multidisciplinary study of these topics linked by a common field approach: high resolution sampling of well-defined High Arctic stratigraphic sections. Volcanic rocks will be sampled for paleomagnetism, geochronology and geochemistry, whereas fossils will be collected to better characterize Late Cretaceous-Paleogene polar temperatures.Broader impacts of the proposed research: The Principal Investigator expects that the definition of a geomagnetic reversal recorded in lavas from a site within the tangent cylinder will be of interest to a broad range of scientists interested in core processes, while further determinations of the nature and age of these rocks will be important for those interested in the tectonic development of the Arctic Ocean and its margins. In addition, the study of vertebrate fossils associated with these volcanic rocks will be of interest to the paleoclimate community. This project will support a Ph.D. thesis and the studies of several undergraduate students. Undergraduates typically take part in the field work, and many conduct analyses of samples in the laboratory through independent study projects and undergraduate senior theses. He also plans outreach activities by presenting the findings to Arctic (Nunavut) communities.