Glacial-Interglacial Variations in Late Paleozoic Atmospheric Circulation Inferred from Loessite-Paleosol Couplets of Western Equatorial Pangea

从西赤道盘古大陆黄土-古土壤联体推断晚古生代大气环流的冰期-间冰期变化

基本信息

  • 批准号:
    0418983
  • 负责人:
  • 金额:
    --
  • 依托单位:
  • 依托单位国家:
    美国
  • 项目类别:
    Standard Grant
  • 财政年份:
    2004
  • 资助国家:
    美国
  • 起止时间:
    2004-08-01 至 2009-07-31
  • 项目状态:
    已结题

项目摘要

Earth's climate during the late Paleozoic (ca. 300 Ma) was profoundly affected by both large-scalecontinental glaciation and monsoonal circulation. Accordingly, key elements of its climate exhibitparallels to Earth's modern climate, which has intrigued both those who model climate, and those whoreconstruct climate using proxy data. Validation and further sophistication of climate models of thisinterval are hampered, however, by low-resolution geologic datasets. That is, although the broad strokesof Pangea's climate system are well established, many aspects remain unconstrained.Preliminary geochronologic and sedimentologic data collected by the PIs from a lower Permianloessite-paleosol couplet in the study region document a profound shift in equatorial wind direction andstrength; the PIs hypothesize that this shift signals a geologically abrupt change in the intensity ofmonsoonal circulation of western Pangea between glacials, and interglacials. The objective of theproposed study, therefore, is to examine and characterize in detail the character, variability, andchronology of such high-frequency shifts in atmospheric circulation in western equatorial Pangea, justbefore and after onset of monsoonal conditions. To achieve this, the PIs and students will study loessite(eolian silt) and intercalated paleosols that record alternating glacial-interglacial states. The PIs havetargeted for study loessite-paleosol couplets that represent wide geographic coverage in westernequatorial Pangea (western U.S.), and that date from (1) middle-late Pennsylvanian (zonal), and (2) earlyPermian (monsoonal) times. Each study couplet will be subjected to several previously-tested techniquesincluding detrital-zircon based provenance analysis, magnetic susceptibility, whole-rock geochemistry,and grain-size analysis as proxies for various climatic parameters including wind direction, strength, andseasonality, and relative aridity. High-precision, radio-isotopic (U-Pb) dating of the youngest (volcanic)detrital zircons and some experimental dating of pedogenic carbonate will be used to improve absoluteage constraints on the target couplets, and constrain durations of these glacial-interglacial shifts.Intellectual Merit of Proposed Activity-- Project results will enable examination of late Paleozoicicehouse variations in atmospheric circulation at an unprecedented detail, and in particular, high-resolution(glacial-interglacial) shifts in equatorial circulation during both zonal and monsoonal states ofthe Pangean interval. Results will also provide improved age constraints on target strata, and durations ofclimatic fluctuations, and will enable further testing of the paleosol-carbonate dating technique.Broader Impacts Resulting from Proposed Activity "Project results will provide better constraints forclimate models of the late Paleozoic and for natural variation in climatic conditions of interglacials overgeologically long periods of time. Accordingly, results should further our understanding of Earth'sclimate system in general, ultimately contributing to improved climate predictions in our moderninterglacial world. The PIs will fund and train at least two graduate students directly from this proposedresearch, and have a strong commitment to, and history of, involving undergraduate geoscience majors intheir research, which they will continue in the proposed project. OU's formal agreement with Fort ValleyState University (a Historically Black University), in which upperclassmen complete their geologydegrees at OU, offers an excellent opportunity to involve minority students in this undergraduate research.MJS has also used NSF funds to support science-education majors in undergraduate research projects, andwill actively recruit at least one such student to work on aspects of the proposed project. The projectwill enhance teaching and training at all levels (undergraduate through professional). MJS teaches anEarth System Science course for education majors, and GSS teaches advanced courses in Earth's PastClimate and Depositional Systems; both PIs regularly utilizes case examples from their own research toillustrate climate concepts. Furthermore, the project will enable significant cross-disciplinary training, andinvolves a mixed-gender research team of sedimentologists and geochronologists. Finally, the PIs andstudents will continue to disseminate results in high-profile journals and at national meetings.
地球的气候在晚古生代(约。300 Ma)受到大规模陆内冰川作用和季风环流的深刻影响。因此,其气候的关键要素与地球的现代气候相似,这引起了气候模型和使用代用数据重建气候的人的兴趣。然而,低分辨率的地质数据集阻碍了这一时期气候模型的验证和进一步完善。也就是说,尽管泛古陆气候系统的大部分特征已经确立,但许多方面仍然不受约束。研究所从研究区域的下二叠统黄土-古土壤对中收集的初步地质年代学和沉积学数据证明,赤道风向和强度发生了深刻的变化; PI假设这种转变标志着冰川之间西盘古大陆季风环流强度的地质突变,和间冰期因此,拟议研究的目的是详细研究和描述西赤道泛大陆大气环流中这种高频变化的特征、变化和年代学,就在季风条件开始之前和之后。为了实现这一目标,PI和学生将研究黄土(风成淤泥)和夹层古土壤记录交替冰川间冰期状态。PI的目标是研究黄土-古土壤偶联,这些偶联代表了西部赤道盘古大陆(美国西部)的广泛地理覆盖范围,(2)早二叠世(季风期)。每个研究对将受到几个先前测试的technologesincluding碎屑锆石为基础的物源分析,磁化率,全岩地球化学和粒度分析作为代理的各种气候参数,包括风向,强度,季节性和相对干旱。高精度放射性同位素(U-Pb)测年(火山)碎屑锆石和一些成土碳酸盐的实验测年将用于改善对目标偶的绝对年龄约束,并约束这些冰川-间冰期转变的持续时间。高分辨率(冰川间冰期)的转变,赤道环流在纬向和季风状态的盘古间隔。结果还将提供对目标地层的更好的年龄限制,以及气候波动的持续时间,并将使古土壤-碳酸盐定年技术的进一步测试成为可能。拟议活动产生的更广泛的影响“项目结果将为晚古生代气候模型和间冰期气候条件的自然变化提供更好的限制。因此,这些结果应该会进一步加深我们对地球气候系统的理解,最终有助于改善我们现代间冰期世界的气候预测。PI将资助和培训至少两名研究生直接从这个proposedresearch,并有一个强有力的承诺,和历史,涉及本科地球科学专业在他们的研究,他们将继续在拟议的项目。麻省理工学院与山谷堡州立大学(一所历史悠久的黑人大学)的正式协议,让高年级学生在麻省理工学院完成他们的地质学学位,提供了一个让少数民族学生参与这项本科研究的绝佳机会。麻省理工学院还利用NSF的资金支持本科研究项目中的科学教育专业,并将积极招募至少一名这样的学生来参与拟议项目的各个方面。该项目将加强各级(本科到专业)的教学和培训。MJS教授教育专业的地球系统科学课程,GSS教授地球过去气候和沉积系统的高级课程;两个PI经常利用自己研究的案例来说明气候概念。此外,该项目将促成重要的跨学科培训,并将包括一个由沉积学家和地质年代学家组成的男女混合研究小组。最后,PI和学生将继续在高知名度期刊和国家会议上传播成果。

项目成果

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Michael Soreghan其他文献

Michael Soreghan的其他文献

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{{ truncateString('Michael Soreghan', 18)}}的其他基金

Land-Use and Climate Influences on Lake Tanganyika Floor Sediments and Ecosystems
土地利用和气候对坦噶尼喀湖底沉积物和生态系统的影响
  • 批准号:
    1424907
  • 财政年份:
    2014
  • 资助金额:
    --
  • 项目类别:
    Standard Grant
Collaborative Research: Records of Permian environments and climate from mid-continent redbeds and evaporites
合作研究:来自中部大陆红床和蒸发岩的二叠纪环境和气候记录
  • 批准号:
    1053018
  • 财政年份:
    2011
  • 资助金额:
    --
  • 项目类别:
    Continuing Grant
US-Tanzania Planning Visit: Investigating high-latitude climate change recorded in upper Paleozoic non-marine strata of East Africa
美国-坦桑尼亚计划访问:调查东非上古生代非海洋地层记录的高纬度气候变化
  • 批准号:
    1033143
  • 财政年份:
    2010
  • 资助金额:
    --
  • 项目类别:
    Standard Grant
Integration of Laboratory and Lecture within an IntroductoryGeology Course: Combining a Constructivist and Case Study Approach
地质学入门课程中实验室和讲座的整合:结合建构主义和案例研究方法
  • 批准号:
    9752327
  • 财政年份:
    1998
  • 资助金额:
    --
  • 项目类别:
    Standard Grant

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