Open AccessMagnetic parameters and palaeoclimate: A case study of loess deposits of North-East of Iran
Author(s) -
Habib Alimohammadian,
Fereshteh Mahdipour Haskouei,
Jafar Sabouri
Publication year - 2021
Publication title -
geofísica internacional
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.159
H-Index - 26
ISSN - 0016-7169
DOI - 10.22201/igeof.00167169p.2021.60.4.1949
Subject(s) - paleosol , loess , geology , interglacial , paleoclimatology , glacial period , environmental magnetism , pedogenesis , arid , aeolian processes , rock magnetism , magnetic susceptibility , paleontology , magnetite , geochemistry , physical geography , soil science , soil water , climate change , remanence , chemistry , geography , magnetization , oceanography , magnetic field , physics , quantum mechanics , crystallography
Environmental magnetism techniques enable us to reconstruct paleoclimate conditions in some deposition such as losses. The magnetic properties of minerals are used as proxies for environmental changes. For this study, loess/paleosol sequence of Kolet section at Neka, north-east of Iran were magnetically investigated. We applied environmental magnetism methods, to reconstruct paleoclimate changes. We investigated relationship between paleoclimate changes and environmental magnetism proxies like magnetic susceptibility (?) variation. The laboratory techniques indicated the presence of main factor of magnetic property in loess/paleosol sequence, such as magnetite, maghemite and etc. We also estimated magnetically parameters (like SIRM, HIRM and etc.) to confirm concentrations of both aeolian and pedogenic particles versus variations of magnetic susceptibility enhancement. The ? values show prominent peaks for the three well developed soil and paleosol horizons, Recent Soil (S0), Upper Paleosol (S1) and Lower Paleosol (S2); which refer to warmer and wetter conditions. As result, we concluded that the increase/decreasing of magnetic susceptibility is coinciding with palaeosol/loess sequence, and probably with humid/arid conditions. Moreover, variations of magnetic susceptibility versus lithological column of Kolet section enabled us to recognize paleoclimatically periods known as interglacial/glacial cycles. The obtained magnetic data indicate that during over the past 50 ka, there have been at least two glacial/interglacial periods and since last 20 ka, there was no main glaciation occurrence, in the study area.