Attraction in the Dark: The Magnetism of Speleothems
Attraction in the Dark: The Magnetism of Speleothems
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DOI：
10.2138/gselements.17.2.113
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发表时间：
2021-04
期刊：
影响因子：
4.5
通讯作者：
J. Feinberg;K. Hobart
中科院分区：
文献类型：
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作者：
J. Feinberg;K. Hobart
无论一个洞穴环境看起来多么安静和原始，所有的洞穴沉积物都含有磁性矿物的组合。这些氧化铁矿物主要来自上覆土壤，尽管少量部分可能来自溶解基岩的残留物，由偶发洪水携带的再加工沉积物，地质微生物活动，甚至是风吹尘埃。无论其起源如何，这些矿物在固定在洞穴沉积物不断生长的碳酸盐基质中之前都会与地球环境磁场对齐。在这里，我们描述了如何利用石笋和流石的磁性来记录高分辨率的地磁行为和环境变化。
No matter how quiet and pristine a cave setting may appear, all speleothems contain assemblages of magnetic minerals. These iron oxide minerals are derived largely from overlying soils, though minor fractions may come from the residuum of dissolved bedrock, reworked sediment carried by episodic floods, geomicrobiological activity, and even windblown dust. Regardless of their origin, these minerals become aligned with Earth’s ambient magnetic field before they are fixed within a speleothem’s growing carbonate matrix. Here, we describe how the magnetism of stalagmites and flowstone can be used to chronicle high-resolution geomagnetic behavior and environmental change.