US-Brazil Planning Visit: An Integrated Approach to Resolving the late Paleozoic Ice Age in the Parana Basin, Brazil

美国-巴西计划访问：解决巴西巴拉那盆地晚古生代冰河时代问题的综合方法

• 批准号: 1444181
• 负责人: John Isbell
• 金额: $ 3.07万
• 依托单位: University of Wisconsin-Milwaukee
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-06-01 至 2017-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1444181&HistoricalAwards=false
• 关键词: US; Brazil; Planning; Visit; Integrated

US-Brazil Planning Visit: A Collaborative Effort to Reconstruct the Climate of the Last Icehouse in the Paraná Basin, BrazilPart1: This international collaborative research will revolutionize our ability to correlate geologic, paleoclimate, and biotic events throughout South America and will permit assessment of the degree of global synchroneity of events and the nature of teleconnections in the late Paleozoic climate system. The geochronologic framework we will develop has the potential to also contribute to unraveling the tectonic evolution of the Andes and shedding light on the origin of economic metals and petroleum resources in South America. The long-term international collaboration will facilitate the exchange of scientific and education information and resources by the investigators and provide more diverse training of US and Brazilian undergraduate and graduate students.Part2:The last icehouse on Earth (340 to 260 million years ago), prior to our current glacial world, was the longest lived and most geographically extensive ice age of the past half billion years. Despite substantially different geography than today, the late Paleozoic Ice Age (LPIA) provides insight into the response of icehouse climate processes and the biosphere to major perturbation, including CO2-forcing of climate. The demise of this icehouse records the only transition of a vegetated and metazoan world from a glacial state to fully greenhouse conditions. Studies of the past two decades have raised fundamental questions and defined paradoxes regarding the climate system and climate-life linkages during this time. Resolving these scientific issues requires better time constraints for high-latitude depositional basins that contain a rich record of the LPIA. The Paraná Basin is an ideal natural laboratory as it contains one of the thickest successions of late Paleozoic glacial and post-glacial strata and has long been considered a key geographic piece of the puzzle regarding the nature and timing of glaciation in Gondwana. Widely distributed volcanic ashes offer the potential to develop a U-Pb dated higher latitude record of high temporal resolution and continuity. Sedimentary deposits, which are rich in paleoclimate proxies and characterize the successions above and between glacial deposits provide an opportunity to evaluate, via fossil soil, geochemical and fossil leaf analyses, how the regional climate conditions and paleo-atmospheric CO2 varied between glacial maxima and glacial minima. We are carrying out a planning visit and reconnaissance fieldtrip to initiate an international research and education collaboration with Brazilian investigators at the Universidade Federal do Rio Grande Do Sul (Roberto Iannuzzi) and the Universidade Federal do Paraná (Fernando Farias Vesely). The longer-term collaborative project, which integrates the group?s complimentary scientific interests and expertise, focuses on three research objectives that will improve our understanding of the climate system and climate-life linkages during this last icehouse. These include (1) developing high-precision U-Pb ages for ashes within the Permo-Carboniferous succession of the Paraná Basin, (2) integrating field evidence of the geographic distribution of ice sheets with the U-Pb and Hf isotopic compositions of detrital zircons from glacial deposits in order to reconstruct the ice sheet history in west-central Gondwana, and (3) developing high-resolution climate records for the Paraná Basin & assess their linkages to the glaciation history, Gondwanan paleobotanical records, and existing lower-latitude (paleotropical) proxy records.

US-Brazil Planning Visit: A Collaborative Effort to Reconstruct the Climate of the Last Icehouse in the Paraná Basin, BrazilPart1: This international collaborative research will revolutionize our ability to correlate geologic, paleoclimate, and biotic events throughout South America and will permit assessment of the degree of global synchroneity of events and the nature of teleconnections in the late Paleozoic climate system.我们将开发的地质框架有可能促进安第斯山脉的构造演变，并阐明了南美经济金属和石油资源的起源。长期的国际合作将促进调查人员的科学和教育信息和资源的交流，并为我们和巴西本科生和研究生提供更多的潜水员培训。PART2：地球上的最后一个冰屋（340至2.6亿年前）（在我们目前的冰川世界之前，是最长的冰川世界，是过去的最长的冰期冰期年龄，是过去的一半账单年龄。尽管地理与今天的地理显着不同，但晚古生代冰河时代（LPIA）提供了对冰屋气候过程和生物圈对重大扰动的反应的见解，包括气候的二氧化碳。这个冰屋的消亡记录了植被和后生世界从冰川状态到完全温室的唯一过渡。状况。在此期间，过去二十年的研究提出了基本问题，并定义了有关气候系统和气候生活联系的悖论。解决这些科学问题需要更好的时间限制，即具有LPIA丰富记录的高纬度沉积低音。 Paraná盆地是理想的天然实验室，因为它包含了晚期古生代冰期和冰川后层的最厚的连续性之一，并且长期以来我们被认为是冈瓦纳（Gondwana）冰川化的性质和时机的关键地理。广泛分布的火山灰分有可能开发出高度临时分辨率和连续性的更高纬度记录的潜力。富含古气候代理并表征冰川沉积物之间的继任的沉积沉积物为通过化石土壤，地球化学和化石叶分析，区域气候条件以及冰川含量如何在冰川含量和熟悉的葡萄孢菌之间进行评估提供了一个机会。我们正在进行计划访问和侦察现场，以与联邦联邦大学的巴西调查员进行国际研究和教育合作，Rio Grande do Sul（Roberto Iannuzzi）和联邦联邦DoParaná大学（Fernando Farias Vesely）。将小组免费的科学利益和专业知识整合的长期协作项目集中在三个研究目标上，这些研究目标将在最后一个Icehouse期间提高我们对气候系统和气候生活联系的理解。这些包括（1）在ParanáBasin的碳化碳成功中开发高精度的U-PB年龄，（2）整合冰片的地理分布的现场证据与U-PB和HF同位素的地理分布与冰川沉积物中的碎屑沉积物的碎屑锆石的地理作品，以便在冰纸历史上以冰期历史为基础，以使冰盖历史记录在冰上播放，并在冰上建立了较高的杂物（3），即氛围（3）氛围（3），（3）carseran carsan carsrantry（3）（3）和3（3）gondwwwwwesrand anderral carander（3）盆地并评估他们与冰川历史，冈瓦南古植物记录和现有的低纬度（古质）代理记录的联系。