Collaborative Research: Records of Permian Environments and Climate from Mid-Continent Redbeds and Evaporites.

合作研究：中大陆红层和火山岩中的二叠纪环境和气候记录（约3亿至2.5亿年前）是一个巨大变化的时期，包括形成超大陆盘古大陆的长期造山运动的结束，一次主要大陆冰川作用的结束，以及地球历史上最大规模物种灭绝的前奏。 大陆沉积岩，包括红层硅质碎屑岩和碳酸盐岩，在二叠纪沉积在整个美国大陆中部，并记录了重大的气候变化。本研究将整合露头和岩心的沉积学和地球化学数据，以解释这些中-上二叠统红层和碳酸盐岩的沉积环境和古气候。 本研究的目的是确定：（1）中部大陆是否以广泛的湖泊为主，包括淡水和咸水常年以及咸水和酸咸水短暂类型;（2）区域气候变化是否忠实地记录在这些地层中;和（3）？红床？记录了富含铁的风成尘和极端酸性盐湖之间的因果关系。了解过去这些突然的气候和环境变化可以提高我们测试和改进气候模型的能力。

COLLABORATIVE RESEARCH: Records of Permian environments and climate from mid-continent redbeds and evaporitesMichael Soreghan and Gerilyn Soreghan, University of Oklahoma, EAR-1053018Kathy Benison, Central Michigan University, EAR-1053025ABSTRACTThe Permian Period (~300-250 million years ago) is a time of great change, including an end to the long-term mountain building that formed the supercontinent Pangaea, the end of a major continental glaciation, and the prelude to the largest mass extinction in Earth history. Continental sedimentary rocks, including red-bed siliciclastics and evaporites, were deposited during the Permian throughout the midcontinental United States and record major climate change. This research will integrate sedimentologic and geochemical data from outcrops and cores to interpret depositional environments and paleoclimate from these mid-upper Permian redbeds and evaporites. The goal of this research is to determine whether: 1) the mid-continent was dominated by extensive lakes, including freshwater and saline perennial as well as saline and acid-saline ephemeral types; (2) regional climatic changes are faithfully recorded in these strata; and (3) ?redbeds? record a causative link between iron-rich eolian dust and extremely acid saline lakes. Understanding these abrupt climatic and environmental changes in the past improves our ability to test and refine climate models.