干旱区生态环境知识资源中心(Arid): Magnetic properties of surface sediments in Schirmacher Oasis, East Antarctica: spatial distribution and controlling factors

Arid

DOI	10.1007/s11368-020-02824-8
	Magnetic properties of surface sediments in Schirmacher Oasis, East Antarctica: spatial distribution and controlling factors
	Warrier, Anish Kumar; Sebastian, Joju George; Amrutha, K.; Yamuna Sali, A. S.; Mahesh, B. S.; Mohan, Rahul
通讯作者	Warrier, AK
来源期刊	JOURNAL OF SOILS AND SEDIMENTS
ISSN	1439-0108
EISSN	1614-7480
英文摘要	Purpose We investigated the magnetic properties (abundance, grain size, and mineralogy) of iron oxides present in Lake L-55 sediments, Schirmacher Oasis, East Antarctica, with an aim to understand their spatial distribution and the underlying mechanisms that control their formation and distribution. Methods Twenty-five surficial sediments retrieved from different parts of Lake L-55 were subjected to the entire range of environmental magnetic (magnetic susceptibility, anhysteretic remanent magnetization (ARM), isothermal remanent magnetization (IRM)) measurements (at different field strengths). Inter-parametric ratios (chi(ARM)/SIRM, chi(ARM)/chi(lf), chi(ARM)/chi(fd), IRM20 mT/SIRM, IRM20 mT/ARM, S-ratio, L-ratio) provided insights into the magnetic properties (abundance, grain size, and mineralogy of iron oxides). Scanning electron microscopic-energy dispersive X-ray spectroscopic (SEM-EDS) analysis was performed on magnetic extracts from a few sediments. Besides, organic matter (%) was also calculated for the sediment samples. Principal component analysis was performed to gain information on the presence of different components and their relative dominance. Results The iron oxides are strongly magnetic (high values of concentration-dependent parameters). The principal iron oxide is magnetite (S-ratio > 0.90) which is coarse-grained (multi-domain (MD) and stable single-domain (SSD) grains), and there is no influence of authigenic greigite, bacterial magnetite, and anthropogenic magnetite. The mineralogy is confirmed by SEM-EDS data. The iron oxides are of different grain sizes, and their contribution is in the order of MD > SSD > SP as shown by the principal component analysis. Pedogenic iron oxide minerals seem to be present in the samples whose formation is due to the oxidation of magnetite into hematite. However, they are of SSD size and not SP, suggesting that the intensity of pedogenesis is not sufficient to form SP grains. Conclusion The iron oxide minerals are mainly terrigenous, and the biogenic activity within the lake is not sufficient to modify the ferrimagnetic minerals. Spatial distribution patterns suggest the non-uniform distribution of magnetite/titanomagnetite of varying sizes in the lake basin which is transported by both melt water streams and winds.
英文关键词	Iron oxides Melt water Sedimentary processes Environmental magnetism Aeolian Weathering
类型	Article ; Early Access
语种	英语
开放获取类型	Other Gold
收录类别	SCI-E
WOS记录号	WOS:000588957800001
WOS关键词	SCANNING-ELECTRON-MICROSCOPY ; ENVIRONMENTAL MAGNETISM ; LATE QUATERNARY ; LAKE-SEDIMENTS ; GRAIN-SIZE ; BACTERIAL MAGNETITE ; GLACIAL SEDIMENTS ; HEAVY-METALS ; CLIMATE ; SOILS
WOS类目	Environmental Sciences ; Soil Science
WOS研究方向	Environmental Sciences & Ecology ; Agriculture
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/328484
作者单位	[Warrier, Anish Kumar; Sebastian, Joju George; Amrutha, K.; Yamuna Sali, A. S.] Manipal Acad Higher Educ, Manipal Inst Technol, Dept Civil Engn, Manipal 576104, Karnataka, India; [Warrier, Anish Kumar] Manipal Acad Higher Educ, Ctr Climate Studies, Manipal 576104, Karnataka, India; [Mahesh, B. S.; Mohan, Rahul] Minist Earth Sci, Natl Ctr Polar & Ocean Res, Vasco Da Gama 403804, Goa, India
推荐引用方式 GB/T 7714	Warrier, Anish Kumar,Sebastian, Joju George,Amrutha, K.,et al. Magnetic properties of surface sediments in Schirmacher Oasis, East Antarctica: spatial distribution and controlling factors[J].
APA	Warrier, Anish Kumar,Sebastian, Joju George,Amrutha, K.,Yamuna Sali, A. S.,Mahesh, B. S.,&Mohan, Rahul.
MLA	Warrier, Anish Kumar,et al."Magnetic properties of surface sediments in Schirmacher Oasis, East Antarctica: spatial distribution and controlling factors".JOURNAL OF SOILS AND SEDIMENTS