Developing paleomagnetic chronologies of, and paleogeomagnetic understanding from, IODP sites U1486 and U1489 in the western Pacific warm pool.

开发西太平洋暖池 IODP 站点 U1486 和 U1489 的古地磁年代学和古地磁认识。

基本信息

  • 批准号:
    2019480
  • 负责人:
  • 金额:
    $ 8.54万
  • 依托单位:
  • 依托单位国家:
    美国
  • 项目类别:
    Standard Grant
  • 财政年份:
    2020
  • 资助国家:
    美国
  • 起止时间:
    2020-01-01 至 2021-07-31
  • 项目状态:
    已结题

项目摘要

Observations of Earth's magnetic field over timescales from thousands to millions of years are important for understanding how the geodynamo operates and shields the Earth from harmful incoming solar radiation. As ocean sediments accumulate on the seafloor they record the ambient magnetic field and thereby provide an important record of past geomagnetic behavior. Many of the existing high quality records that span the last 2-3 million years are from North Atlantic Ocean sediments, which represents a narrow, and maybe even unique, magneto-geographical range. To properly represent the global field and its variability requires records from other regions of the globe for the same time period. Integrated Ocean Drilling Program (IODP) Expedition 363 to the West Pacific Warm Pool drilled nine equatorial sites in the Indian and Pacific Oceans and recovered a total of 7km of ocean sediment core. Preliminary measurements suggest two of these sites, U1486 and U1489, contain high quality magnetic records that can be used to investigate and understand the behavior of Earth's magnetic field over the last 1.25 (U1486) and 5 (U1489) million years. This project seeks to measure the magnetism of these sediments to develop and refine high resolution records of Earth's recent magnetic field behavior and compare them to North Atlantic records. The project will also develop the longest continuous relative paleomagnetic intensity time-series to date back to the earliest Pliocene (~5 million years ago). In addition, these paleomagnetic records will provide a chronological framework for related detailed isotope and climate studies for the region. In terms of broader impacts and outreach, this project will directly support the training and development of a post-doc as the principal investigator and will expose undergraduate students from Oregon State University to basic research methods and concepts. There will be special attention placed on undergraduates being involved in original research, the development of project "ownership" for undergraduate students, and in recruiting a diverse team of researchers.Paleomagnetic records derived from relatively high sedimentation rate marine cores in the North Atlantic strongly inform and define our current understanding of paleomagnetic secular variation and relative paleointensity (RPI). Replication of records from within this basin argue for RPI variations that have a global expression and reflect stochastic variations in the intensity of the dipolar field. This assumption is likely true, however, it has never explicitly been tested, in part due to a lack of records from different regions of the globe that have a similar resolving ability (i.e. sedimentation rate) to those in the North Atlantic. We will take u-channel samples from the archives halves of U1486 and U1489 and measure the magnetic susceptibility and demagnetization behaviors of the natural remanent magnetization (NRM), anhysteretic remanent magnetization (ARM) and isothermal remanent magnetization (IRM) at centimeter scale. We will use these data to generate characteristic remanent directions and generate estimates of RPI over long Pleistocene and Pliocene timeframes. The 1.25 Myr equatorial Pacific marine sediment record from Site U1486 can be queried for evidence of non-axial-dipole structure and regional heterogeneities at a resolution several times higher than existing records and stacks and is more similar to high quality North Atlantic records. Site U1489 contains a 5 Myr record of sedimentation that will be developed into the longest continuous RPI record ever produced. Preliminary data suggest it is of remarkable fidelity and, when paired with the d18O benthic foraminifer stratigraphy being developed concurrently for this site, can potentially become the type record for Pliocene geomagnetic field behavior. Not only will this record be a magnetostratigraphic tuning target for the Pliocene, it will also inform inquiries into geomagnetic field evolution and organization over the scale of (sub-)orbital variations to full chrons and epochs. RPI-assisted chronologies will be developed for the mid-late Pleistocene records of both U1486 and U1489 (through correlation to existing global stacks) that can then be tandemly tuned with d18O records to develop robust chronologies and the establishment of a strong chronostratigraphic framework to directly facilitate the science objectives of IODP Expedition 363.
从几千年到几百万年的时间尺度上对地球磁场的观测对于了解发电机是如何运行并保护地球免受有害的太阳辐射的影响非常重要。当海洋沉积物在海底堆积时,它们记录了周围的磁场,从而提供了过去地磁行为的重要记录。许多现有的高质量记录跨越了过去200-300万年,来自北大西洋沉积物,这代表了一个狭窄的,甚至可能是独特的磁地理范围。要恰当地表示全球场及其可变性,需要同一时间段全球其他区域的记录。综合海洋钻探计划(IODP)363次西太平洋暖池探险在印度洋和太平洋的9个赤道点进行了钻探,总共采集了7公里的海洋沉积物岩心。初步测量表明,其中两个地点,U1486和U1489,包含高质量的磁记录,可用于调查和了解过去1.25亿年(U1486)和500万年(U1489)地球磁场的行为。该项目寻求测量这些沉积物的磁性,以开发和完善地球最近磁场行为的高分辨率记录,并将它们与北大西洋记录进行比较。该项目还将开发自上新世(约500万年前)以来最长的连续相对古地磁强度时间序列。此外,这些古地磁记录将为该区域相关的详细同位素和气候研究提供年代学框架。在更广泛的影响和推广方面,该项目将直接支持作为首席研究员的博士后的培训和发展,并将使俄勒冈州立大学的本科生接触到基本的研究方法和概念。将特别关注本科生参与原创研究,为本科生开发“所有权”项目,并招募不同的研究团队。来自北大西洋相对较高的沉积速率海洋岩心的古地磁记录强烈地告知并定义了我们目前对古地磁长期变化和相对古强度(RPI)的理解。来自该盆地内的重复记录证明了RPI变化具有全球表达式,并反映了偶极场强度的随机变化。然而,这一假设可能是正确的,但它从未得到明确的检验,部分原因是缺乏来自全球不同地区的记录,这些地区的分辨率(即沉积速率)与北大西洋的记录相似。我们将从U1486和U1489的档案中采集U型通道样品,在厘米尺度上测量自然剩余磁化强度(NRM)、无滞后剩余磁化强度(ARM)和等温剩余磁化强度(IRM)的磁化率和退磁行为。我们将使用这些数据来生成特征剩余方向,并生成长更新世和上新世时间框架内的RPI估计。U1486站点的1.25Myr赤道太平洋海洋沉积物记录可以查询到非轴偶极子结构和区域不均匀的证据,分辨率比现有记录和叠加高几倍,更接近于高质量的北大西洋记录。U1489站点包含一个5Myr的沉积记录,它将被开发成有史以来最长的连续RPI记录。初步数据表明,它具有惊人的保真度,当与该地点同时开发的d18O海底有孔虫地层学配对时,可能成为上新世地球磁场行为的类型记录。这一记录不仅将成为上新世磁性地层调谐的目标,还将为研究地球磁场的演变和组织提供信息,了解(亚)轨道变化到全克伦和历元的规模。将为U1486和U1489的中晚更新世记录编制RPI辅助年表(通过与现有全球堆栈的对比),然后可以与d18O记录一起进行调整,以编制可靠的年表,并建立强有力的年代地层框架,直接促进IODP探险363的科学目标。

项目成果

期刊论文数量(1)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Relative Paleointensity Record of Integrated Ocean Drilling Program Site U1396 in the Caribbean Sea: Geomagnetic and Chronostratigraphic Observations in the Pliocene
加勒比海综合海洋钻探计划站点 U1396 的相对古强度记录:上新世地磁和年代地层观测
  • DOI:
    10.1029/2021gc009677
  • 发表时间:
    2021
  • 期刊:
  • 影响因子:
    0
  • 作者:
    Hatfield, R. G.;Stoner, J. S.;Fraass, A. J.
  • 通讯作者:
    Fraass, A. J.
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Robert Hatfield其他文献

Methodological advances in the detection of biotoxins and pathogens affecting production and consumption of bivalve molluscs in a changing environment
在不断变化的环境中,用于检测影响双壳类软体动物生产和消费的生物毒素和病原体的方法学进展
  • DOI:
    10.1016/j.copbio.2023.102896
  • 发表时间:
    2023-04-01
  • 期刊:
  • 影响因子:
    7.000
  • 作者:
    Frederico M Batista;Robert Hatfield;Andrew Powell;Craig Baker-Austin;James Lowther;Andrew D Turner
  • 通讯作者:
    Andrew D Turner

Robert Hatfield的其他文献

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{{ truncateString('Robert Hatfield', 18)}}的其他基金

Collaborative Research: Spatiotemporal observations of the demise of an ice sheet: Paleo perspectives from Baffin Bay, West Greenland.
合作研究:冰盖消亡的时空观察:西格陵兰巴芬湾的古视角。
  • 批准号:
    2112536
  • 财政年份:
    2022
  • 资助金额:
    $ 8.54万
  • 项目类别:
    Continuing Grant
Developing paleomagnetic chronologies of, and paleogeomagnetic understanding from, IODP sites U1486 and U1489 in the western Pacific warm pool.
开发西太平洋暖池 IODP 站点 U1486 和 U1489 的古地磁年代学和古地磁认识。
  • 批准号:
    1737333
  • 财政年份:
    2017
  • 资助金额:
    $ 8.54万
  • 项目类别:
    Standard Grant
Collaborative Research: Expanding the Tephrochronologic Record of the Northern Lesser Antilles Arc: Rapid Identification of Cryptotephra Using Multiple Methods
合作研究:扩大北小安的列斯群岛弧的地热年代记录:使用多种方法快速鉴定隐壳虫
  • 批准号:
    1347912
  • 财政年份:
    2014
  • 资助金额:
    $ 8.54万
  • 项目类别:
    Standard Grant
Paleomagnetic Assisted Chronology of IODP Sites U1395 and U1396
IODP 站点 U1395 和 U1396 的古地磁辅助年代学
  • 批准号:
    1260671
  • 财政年份:
    2013
  • 资助金额:
    $ 8.54万
  • 项目类别:
    Standard Grant
Placement of Retired Professionals in Secondary Schools for Teaching Science and Mathematics
将退休专业人员安置在中学教授科学和数学
  • 批准号:
    8751391
  • 财政年份:
    1988
  • 资助金额:
    $ 8.54万
  • 项目类别:
    Continuing Grant

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ODP 站点 1060、1061、1062 和 1063 早期 Brunhes 时间(380-780 ka)古地磁长期变化和偏移的再分析
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    NE/V014722/1
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    2129791
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    2020
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Upgrade of Spinner Magnetometer for Continuing and New Paleomagnetic Research Objectives at Tufts University
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  • 批准号:
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Recovery of high-resolution paleomagnetic intensity records from marine sediments in a reduced condition
在还原条件下从海洋沉积物中恢复高分辨率古地磁强度记录
  • 批准号:
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MRI: Acquisition of a Lake Shore Cryotronics High performance Vibrating Sample Magnetometer to enhance the New Mexico Highlands University Paleomagnetic-Rock Magnetism Laboratory
MRI:采购 Lake Shore Cryotronics 高性能振动样品磁力计,以增强新墨西哥高地大学古磁岩磁力实验室
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    1918357
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