Magnetic Mineralogy in Lunar Mare Basalts and Implications for Paleointensity Retrieval

IF 4 1区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS
Ji-In Jung, Sonia M. Tikoo, Zoltán Váci, Michael J. Krawczynski, Peat Solheid, Dale H. Burns, Arturas Vailionis
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Abstract

Lunar paleomagnetic studies have identified multidomain metallic Fe–Ni alloys as the dominant magnetic contributors in mare basalts. Here, we explore the low-temperature magnetic behavior of standard samples for a suite of opaque minerals that occur within mare basalts (single-domain and multidomain Fe, wüstite, ulvöspinel, iron chromite, ilmenite, and troilite). We compare the observed low-temperature behaviors to those of several Apollo mare basalt samples (10003, 10044, 10020, 10069, 10071, 12009, 12022, 15597). Notable magnetic transitions were detected at < ${< } $ 30 K (ilmenite), 60–80 K (chromite, troilite), and 100–125 K (ulvöspinel, chromite). We also investigated the effects of low-temperature cycling on mare basalt remanence and observed that only grains with coercivities < ${< } $ 20–40 mT were cleaned. This suggests a minimal impact of diurnal temperature cycling at the lunar surface on the retrieved lunar paleointensity values. Using comprehensive electron microscopy techniques, including scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), wavelength dispersive spectroscopy (WDS), x-ray diffraction, and transmission electron microscopy (TEM), we further examined magnetic phases within four Apollo 11 mare basalt samples. Our findings revealed the presence of Fe grains (one to 10 μm in diameter) associated with troilite contain sub-grains ranging in size from tens to hundreds of nanometers in some samples. These grains, which fall within the single-domain to multi-domain range as observed in their first-order reversal curves, might have the potential to retain high coercivity components and thereby effectively record an ancient dynamo field.

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月海玄武岩的磁矿物学及其古强度反演意义
月球古地磁研究表明,多畴金属铁镍合金是海玄武岩中主要的磁性贡献者。在这里,我们探索了一套不透明矿物的标准样品的低温磁性行为,这些矿物出现在海玄武岩中(单畴和多畴铁,w铁石,ulvöspinel,铁铬铁矿,钛铁矿和三铁铁矿)。我们将观测到的低温行为与几个阿波罗海玄武岩样品(10003、10044、10020、10069、10071、12009、12022、15597)进行了比较。在<; ${<} $ 30 K(钛铁矿),60-80 K(铬铁矿,三铁铁矿)和100-125 K (ulvöspinel,铬铁矿)检测到显著的磁跃迁。我们还研究了低温循环对海玄武岩残余的影响,并观察到只有矫顽力为<; ${<} $ 20-40 mT的晶粒被清洗。这表明月球表面日温度循环对月球古强度值的影响很小。利用扫描电子显微镜(SEM)、能量色散光谱(EDS)、波长色散光谱(WDS)、x射线衍射和透射电子显微镜(TEM)等综合电子显微镜技术,我们进一步研究了4个阿波罗11号海玄武岩样品的磁相。我们的研究结果表明,在一些样品中,与三黄石相关的铁颗粒(直径1至10 μm)含有数十至数百纳米的亚颗粒。这些颗粒在一阶反转曲线中处于单域到多域范围,可能具有保留高矫顽力成分的潜力,从而有效地记录了古代发电机场。
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来源期刊
Journal of Geophysical Research: Planets
Journal of Geophysical Research: Planets Earth and Planetary Sciences-Earth and Planetary Sciences (miscellaneous)
CiteScore
8.00
自引率
27.10%
发文量
254
期刊介绍: The Journal of Geophysical Research Planets is dedicated to the publication of new and original research in the broad field of planetary science. Manuscripts concerning planetary geology, geophysics, geochemistry, atmospheres, and dynamics are appropriate for the journal when they increase knowledge about the processes that affect Solar System objects. Manuscripts concerning other planetary systems, exoplanets or Earth are welcome when presented in a comparative planetology perspective. Studies in the field of astrobiology will be considered when they have immediate consequences for the interpretation of planetary data. JGR: Planets does not publish manuscripts that deal with future missions and instrumentation, nor those that are primarily of an engineering interest. Instrument, calibration or data processing papers may be appropriate for the journal, but only when accompanied by scientific analysis and interpretation that increases understanding of the studied object. A manuscript that describes a new method or technique would be acceptable for JGR: Planets if it contained new and relevant scientific results obtained using the method. Review articles are generally not appropriate for JGR: Planets, but they may be considered if they form an integral part of a special issue.
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