Collaborative Research: Integrated Eocene-Oligocene Stratigraphy of Alabama and Mississippi Boreholes: Comparison with the NJ Transect and Global Sea-Level Proxies

9506451 肯特 全球海平面、局部构造和沉积物供给变化的过程控制着被动大陆边缘沉积作用。 确定每一个的作用需要在不同的构造环境中对地层剖面进行连续采样和测年。 全球海平面研究是全球变化计划的一个基本组成部分，海平面研究需要在被动大陆边缘钻探钻孔断面。 这些断面将首先侧重于渐新世-新近纪“冰室”，未来的钻探将解决古新世-始新世“温室”和“冰室”期间冰量变化不明显的海平面变化问题。 主要研究人员目前正在NSF的资助下，编制一份新泽西沿海平原始新世至中新世中期层序的可靠年表，但需要其他被动边缘的年代较好的剖面，以评估海平面变化对局部影响的作用。 以前和正在进行的研究表明，从西部亚拉巴马和东部密西西比连续岩心提供新鲜的，未风化的材料，从中始新世到“中”渐新世。 主要研究人员将对密西西比最近钻探的三个钻孔进行综合磁、生物和同位素（锶、氧和碳）研究。 由阿科资助的初步结果表明，这些钻孔含有扩大的上始新世到下渐新世部分适合磁，生物和锶同位素研究。 这些部分应与主要研究者在新泽西正在进行的研究进行比较。 亚拉巴马和密西西比的研究将提供一个渐新世的“冰屋”断面，与新泽西的序列和全球海平面变化的其他代理进行比较，并提供一个详细的“温室”早始新世和“Doubhouse”中晚始新世断面。 ***

9506451 Kent The processes of global sea-level, local tectonics, and changes in sediment supply control passive continental margin sedimentation. Determining the role of each requires continuous sampling and dating of stratigraphic sections in different tectonic settings. Global sea level studies are a fundamental component of global change programs and sea level studies require drilling transects of boreholes on passive continental margins. These transects will first focus on the Oligocene-Recent "Icehouse" with future drilling to address sea-level changes during the Paleocene- Eocene "Greenhouse" and "Doubthouse" when ice-volume changes were not apparent. The principal investigators are currently developing, with NSF funding, a firm chronology of New Jersey coastal plain Eocene to middle Miocene sequences, but require well- dated sections on other passive margins to evaluate the role of eustatic versus local effects. Previous and ongoing studies show that continuous cores from western Alabama and eastern Mississippi provide fresh, unweathered material from the middle Eocene to the "middle" Oligocene. The principal investigators will conduct integrated magneto-, bio-, and isotopic (Sr, oxygen, and carbon) studies of three recently drilled boreholes in Mississippi. Preliminary results funded by ARCO show that these boreholes contain expanded upper Eocene to lower Oligocene sections suitable for magneto-, bio-, and Sr-isotope studies. These sections should compare well with the principal investigator's ongoing studies in New Jersey. The Alabama and Mississippi studies will provide an "Icehouse" transect of the Oligocene to compare with sequences in New Jersey and other proxies of global sea-level change and a detailed transect of the "Greenhouse" early Eocene and "Doubthouse" middle-late Eocene. ***