RAPID: A Nonmagnetic Sinker Bar for Magnetic Logging on IODP Expedition 330

RAPID:用于 IODP Expedition 330 磁测井的非磁性沉降片

基本信息

项目摘要

Intellectual Merit: IODP Expedition 330 to the Louisville Seamounts starts 12 December 2010 from Auckland, New Zealand. A primary objective of drilling at the Louisville volcanic chain is to document the possible motion of the Louisville hotspot between 80 and 50 Ma. High quality paleomagnetic data are required to document this motion and to compare with the 15° shift observed for the Hawaiian hotspot over this time interval. These data, together with detailed radiometric ages, will provide the basis for calibrating and testing various geodynamic models.The most robust paleolatitude information will be derived from detailed demagnetization studies of the aziumuthally-unoriented core samples. In addition, we will deploy the Göttingen Borehole Magnetometer (GBM) to make 3-componentmagnetic borehole measurements. The main benefit of the GBM is that fiber-optic gryos should allow fully oriented component magnetic anomalies to be determined and magnetization declination to be estimated, facilitating identification of individual flows and a more robust estimate of hotspot and Pacific plate motions. Tests reveal that the sinker bar and centralizer to be used with the GBM both generate substantial magnetic anomalies (up to 10,000 nT at a distance of 1m). These large signals, and importantly the likely changes in these signals on different deployments, compromise the benefits of the magnetic logging.We therefore propose fabrication of a nonmagnetic sinker bar that will allow determination of accurate component magnetic anomalies (and remanent declinations) on Expedition 330 and subsequent expeditions. The large magnetic signature of the existing sinker bar and centralizer were documented in August; the short time before Expedition 330 begins requires rapid requires rapid fabrication of this tool.Broader Impacts: High quality paleomagnetic and age data are required to document the motion of the Louisville hotspot, a primary goal of Expedition 330. The proposed GBM magnetic logging has the potential to provide fully oriented vector magnetic anomalies in the borehole, significantly enhancing the constraints on the past motion of the Louisville hotspot and Pacific plate motion. A number of Expedition participants will be involved in interpretation of the borehole magnetometer results and integrating these results with data from the recovered core material.
学术成就:国际海洋学发展方案第330次考察路易斯维尔海隆,2010年12月12日从新西兰奥克兰出发。在路易斯维尔火山链钻探的主要目的是记录路易斯维尔热点在80和50 Ma之间的可能运动。需要高质量的古地磁数据来记录这种运动,并与在这段时间内观察到的夏威夷热点的15°偏移进行比较。这些数据以及详细的放射性年龄将为校准和测试各种地球动力学模型提供基础,最可靠的古纬度信息将来自对方位不定向岩心样品的详细退磁研究。此外,我们将部署哥廷根钻孔磁力计(GBM)进行三分量磁性钻孔测量。GBM的主要好处是,光纤gryos应允许完全定向的组件磁异常被确定和磁化衰减估计,便于识别个别流量和热点和太平洋板块运动的更强大的估计。测试表明,GBM使用的沉降杆和扶正器都产生大量的磁异常(在1米的距离上高达10,000 nT)。这些大的信号,以及重要的是这些信号在不同部署上的可能变化,损害了磁测井的优点。因此,我们建议制造一个磁沉降棒,以便在远征330和随后的远征中确定准确的分量磁异常(和回波磁偏角)。8月记录了现有沉降杆和扶正器的大型磁性特征;距离330远征开始的时间很短,需要快速制造该工具。更广泛的影响:需要高质量的古地磁和年龄数据来记录路易斯维尔热点的运动,这是330远征的主要目标。建议的GBM磁测井有可能在钻孔中提供完全定向的矢量磁异常,显著增强对路易斯维尔热点和太平洋板块运动的过去运动的约束。考察队的一些参与者将参与解释钻孔磁力计的结果,并将这些结果与从回收的岩心材料中获得的数据结合起来。

项目成果

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Jeffrey Gee其他文献

Learning to be Relevant: Evolution of a Course Recommendation System
学习相关性:课程推荐系统的演变

Jeffrey Gee的其他文献

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{{ truncateString('Jeffrey Gee', 18)}}的其他基金

Collaborative Research: A geomagnetic intensity time series from the Proterozoic Laramie anorthosite
合作研究:元古代拉勒米斜长岩的地磁强度时间序列
  • 批准号:
    1722604
  • 财政年份:
    2017
  • 资助金额:
    $ 1.8万
  • 项目类别:
    Continuing Grant
Collaborative Research: Tracking the thermal and petrologic evolution of magmatically robust fast spread lower ocean crust
合作研究:追踪岩浆强劲、快速扩张的下洋地壳的热学和岩石学演化
  • 批准号:
    1459387
  • 财政年份:
    2015
  • 资助金额:
    $ 1.8万
  • 项目类别:
    Standard Grant
Collaborative Research: High Precision 40Ar/39Ar Geochronology and Paleomagnetism to Determine the History and Consequences of Louisville Mantle Plume Motion
合作研究:高精度 40Ar/39Ar 地质年代学和古地磁学以确定路易斯维尔地幔柱运动的历史和后果
  • 批准号:
    1154675
  • 财政年份:
    2012
  • 资助金额:
    $ 1.8万
  • 项目类别:
    Standard Grant
Collaborative Research: An Evaluation of Ash Flow Tuffs as Geomagnetic Paleointensity Recorders
合作研究:灰流凝灰岩作为地磁古强度记录器的评估
  • 批准号:
    0943999
  • 财政年份:
    2010
  • 资助金额:
    $ 1.8万
  • 项目类别:
    Standard Grant
Collaborative Proposal: Spatial and temporal scales of crustal accretion in slow spreading crust - IODP Site U1309
合作提案:缓慢扩张地壳中地壳增生的时空尺度 - IODP Site U1309
  • 批准号:
    0550466
  • 财政年份:
    2006
  • 资助金额:
    $ 1.8万
  • 项目类别:
    Standard Grant
Collaborative Research: Mapping magnetic anomalies in the Cretaceous "Quiet" Zone using a new airborne autonomous vehicle
合作研究:使用新型机载自动飞行器绘制白垩纪“安静”区域的磁异常图
  • 批准号:
    0452610
  • 财政年份:
    2006
  • 资助金额:
    $ 1.8万
  • 项目类别:
    Standard Grant
Collaborative Research: An Integrated Geomagnetic and Petrologic Study of the Dufek Complex
合作研究:杜菲克杂岩体的综合地磁和岩石学研究
  • 批准号:
    0537609
  • 财政年份:
    2006
  • 资助金额:
    $ 1.8万
  • 项目类别:
    Standard Grant
Collaborative Research: Origin of Magnetite and Magnetic Remanence in Submarine Basaltic Glass and Implications for Glass Paleointensities
合作研究:海底玄武岩玻璃中磁铁矿和剩磁的起源以及对玻璃古强度的影响
  • 批准号:
    0537981
  • 财政年份:
    2005
  • 资助金额:
    $ 1.8万
  • 项目类别:
    Standard Grant
SGER - Ash Flow Tuffs: a New Material for Reliable Paleointensities
SGER - 灰流凝灰岩:一种可靠古强度的新材料
  • 批准号:
    0521374
  • 财政年份:
    2005
  • 资助金额:
    $ 1.8万
  • 项目类别:
    Standard Grant
Collaborative Research: Structure and Composition of Fast-Spread EPR (East Pacific Rise) Oceanic Crust Exposed at Pito Deep
合作研究:皮托深海暴露的快速扩散的 EPR(东太平洋海隆)洋壳的结构和成分
  • 批准号:
    0221948
  • 财政年份:
    2004
  • 资助金额:
    $ 1.8万
  • 项目类别:
    Standard Grant

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