RUI: A sedimentological and sequence stratigraphic framework for carbon isotopic sampling and interpretation

该奖项全部或部分由2021年美国救援计划法案（公法117-2）资助。在古生代（541-251.9百万年前），我们反复淹没在浅海中的大陆。在这些浅海中形成的岩石的化学成分记录了碳如何在海洋、大气、生物圈和沉积物之间移动（碳循环）的细节。该项目将侧重于了解海平面变化如何影响碳循环记录，这将提高我们对地球气候历史的理解。 10名本科生将参加这个项目，并获得宝贵的现场和实验室经验。该项目将探讨海平面与古陆缘碳酸盐岩环境中碳同位素记录之间的关系，并解决以下问题：1）在陆缘碳酸盐岩环境中，海平面的变化是否会导致整体碳酸盐同位素值的一致性和可分辨模式; 2）如果这些模式确实存在，它们在海平面变化的多个尺度上是可分辨的吗？3）模式是否取决于哪个过程（碳循环、大气影响或碳酸盐沉积）发挥主要控制作用？我们将在沉积学和层序地层学框架沿着一个海岸到早密西西比麦迪逊陆架和晚二叠世二叠纪盆地的盆地剖面内生成高分辨率的碳同位素记录，在这些剖面中，海平面很有可能影响碳同位素模式。该项目的结果将对方法学方法和表观海洋碳同位素记录的应用产生影响，产生的碳同位素数据将为晚古生代冰期期间的碳循环和海水化学提供重要的地球化学约束。该奖项反映了NSF的法定使命，并通过利用基金会的知识价值和更广泛的影响进行评估，被认为值得支持审查标准。

This award is funded in whole or in part under the American Rescue Plan Act of 2021 (Public Law 117-2).During the Paleozoic Era (541-251.9 million years ago) the continents we repeatedly submerged by shallow seas. The chemistry of the rocks formed in these shallow seas record details about how carbon moved between the oceans, atmosphere, biosphere, and sediments (carbon cycling). This project will focus on understanding how sea level change influenced the record of carbon cycling, which will improve our understanding of Earth’s climate history. Ten undergraduate students will participate in this project and gain valuable field and laboratory experience. The data generated will be used to build teaching modules to help the public understand how geologists study Earth’s climate history.This project will explore the relationship between sea level and carbon isotopic records in ancient epicontinental carbonate settings by addressing the following questions: 1) does sea level change in epicontinental carbonate settings result in consistent and resolvable patterns in bulk carbonate isotopic values; 2) if these patterns do exist, are they resolvable at multiple scales of sea level change; and 3) are the patterns different depending on which process (carbon cycling, meteoric influence, or carbonate sedimentation) is exerting primary control? We will generate high resolution carbon isotopic records within a sedimentological and sequence stratigraphic framework along a shore to basin transect of the Early Mississippian Madison shelf and the Late Permian Permian Basin, where there is a high probability that sea level influenced the carbon isotopic patterns. Results from this project will have implications for the methodological approach and application of carbon isotopic records from epicontiential seas and the generated carbon isotopic data will provide important geochemical constraints for carbon cycling and sea water chemistry during the Late Paleozoic Ice Age.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.