Link Between Enhanced Pore Surface Relaxivity and Mineral Alteration in Basalts

IF 3.9 2区地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS

Journal of Geophysical Research: Solid Earth Pub Date : 2025-05-19 DOI:10.1029/2025JB031227

Zuhao Kou, James Howard, Olivia Terry, Tianxiao Shen, Lucas Abernathy, Dragan Veselinovic, Michael Dick, Shaina Kelly

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Abstract

Hydrothermal alteration significantly affects the mineralogical and geochemical composition of subsurface rocks. This research utilized a combination of low-field time-domain nuclear magnetic resonance, gas adsorption-desorption isotherms, and scanning electron microscopy (SEM) with energy dispersive spectroscopy to characterize the pore systems of a range of flow top and flow interior basalt samples from Newberry Volcano drill core. A power-law relationship between hydrothermal mineral alteration and magnetic susceptibility of pore-facing minerals is revealed, suggesting a bulk method for quantifying degree of mineral alteration from core or wellbore data. Transverse relaxation time (T₂) distributions, combined with gas adsorption-based and SEM image-based pore size distributions, yield faster T₂ relaxation or enhanced surface relaxivity values within sample micro- and macropores facing or lined with secondary minerals. This relationship can be used to evidence increased paramagnetic metal ion (e.g., Fe, Mn, Cr, Co, V) accessibility for subsurface engineering applications such as in situ carbon mineralization and critical minerals extraction.

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玄武岩孔隙表面弛豫增强与矿物蚀变的关系

热液蚀变显著影响地下岩石的矿物学和地球化学组成。本研究利用低场时域核磁共振、气体吸附-解吸等温线、扫描电子显微镜（SEM）和能量色散光谱相结合的方法，对纽贝里火山岩心中一系列流动顶部和流动内部玄武岩样品的孔隙系统进行了表征。揭示了热液矿物蚀变与面向孔隙矿物磁化率之间的幂律关系，提出了一种从岩心或井筒数据量化矿物蚀变程度的整体方法。横向弛豫时间（T2）分布，结合基于气体吸附和基于SEM图像的孔径分布，在面向或衬有次生矿物的样品微孔和大孔中产生更快的T2弛豫或增强的表面弛豫值。这种关系可以用来证明顺磁性金属离子（如Fe， Mn, Cr, Co， V）在地下工程应用中的可及性增加，如原位碳矿化和关键矿物提取。

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来源期刊

Journal of Geophysical Research: Solid Earth Earth and Planetary Sciences-Geophysics

CiteScore

7.50

自引率

15.40%

发文量

559

期刊介绍： The Journal of Geophysical Research: Solid Earth serves as the premier publication for the breadth of solid Earth geophysics including (in alphabetical order): electromagnetic methods; exploration geophysics; geodesy and gravity; geodynamics, rheology, and plate kinematics; geomagnetism and paleomagnetism; hydrogeophysics; Instruments, techniques, and models; solid Earth interactions with the cryosphere, atmosphere, oceans, and climate; marine geology and geophysics; natural and anthropogenic hazards; near surface geophysics; petrology, geochemistry, and mineralogy; planet Earth physics and chemistry; rock mechanics and deformation; seismology; tectonophysics; and volcanology. JGR: Solid Earth has long distinguished itself as the venue for publication of Research Articles backed solidly by data and as well as presenting theoretical and numerical developments with broad applications. Research Articles published in JGR: Solid Earth have had long-term impacts in their fields. JGR: Solid Earth provides a venue for special issues and special themes based on conferences, workshops, and community initiatives. JGR: Solid Earth also publishes Commentaries on research and emerging trends in the field; these are commissioned by the editors, and suggestion are welcome.