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Mineral magnetic properties of surface soils from the Broknes and Grovnes Peninsula, Larsemann Hills, East Antarctica
Polar Science ( IF 1.8 ) Pub Date : 2023-06-25 , DOI: 10.1016/j.polar.2023.100968
G.S. Joju , Anish Kumar Warrier , Marcos A.E. Chaparro , B.S. Mahesh , Freddy Abraham Matthew , S. Anusree , Rahul Mohan

This study presents the mineral magnetic, particle size, and organic content data of surface soils from Larsemann Hills, East Antarctica. The analysis of isothermal remanent magnetization and the high specific magnetic susceptibility values –mean (±S.D.) values of 117.7 (±175.0) × 10−8m3kg−1 for Broknes Peninsula and of 330.9 (±217.4) × 10−8m3kg−1 for Grovnes Peninsula– indicate high concentrations of low-coercivity magnetic minerals. The magnetic minerals are coarse-grained in the multidomain and pseudo-single domain range, and the significant correlation between some magnetic parameters suggests the dominant control of multidomain grains. The remanent acquisition coercivity H1/2 shows mean (±S.D.) values of 38.2 (±4.9) for Broknes and 38.3 (±3.7) mT for Grovnes soils suggesting magnetite dominance. The soils lie in the sand and loamy sand textural classes, and the concentration of organic matter is very low. Values of percentage frequency-dependent susceptibility indicate insignificant proportions of superparamagnetic grains, and therefore no significant evidence for pedogenic magnetic minerals was observed in these soils. The magnetic signal of Larsemann Hills soils was primarily terrigenous with no contributions from bacterial magnetite, authigenic greigite and anthropogenic magnetic minerals.



中文翻译:

南极洲东部拉瑟曼山布罗克内斯和格罗夫尼斯半岛表层土壤的矿物磁特性

这项研究提供了南极洲东部拉瑟曼山表层土壤的矿物磁性、颗粒尺寸和有机物含量数据。等温剩磁和高比磁化率值的分析——布罗克尼斯半岛的平均(±SD)值为 117.7 (±175.0) × 10 -8 m 3 kg -1和 330.9 (±217.4) × 10 -8 m格罗夫内斯半岛为3 kg -1 –表明低矫顽力磁性矿物浓度较高。磁性矿物在多畴和准单畴范围内呈粗粒状,一些磁性参数之间的显着相关性表明多畴晶粒的主导控制。剩余获得矫顽力 H 1/2显示 Broknes 土壤的平均值 (±SD) 为 38.2 (±4.9),Grovnes 土壤的平均值 (±SD) 为 38.3 (±3.7) mT,表明磁铁矿占主导地位。土壤属于沙土和壤土沙质地类,有机质浓度很低。频率依赖性磁化率百分比值表明超顺磁性颗粒的比例微不足道,因此在这些土壤中没有观察到成土磁性矿物的显着证据。拉斯曼山土壤的磁信号主要是陆源的,没有来自细菌磁铁矿、自生镁灰岩和人为磁性矿物的贡献。

更新日期:2023-06-25
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