Paleointensities of sediment core PG1111, Lama Lake, northern Central Siberia ...
High-resolution analyses of rock magnetic and sedimentological parameters were conducted on an 11 m long sediment core from Lama Lake, Northern Siberia, which encompasses the late Pleistocene and the Holocene epochs. The results reveal a strong link between the median grain size of the magnetic part...
Main Authors: | , , |
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Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
PANGAEA
2001
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Subjects: | |
Online Access: | https://dx.doi.org/10.1594/pangaea.788417 https://doi.pangaea.de/10.1594/PANGAEA.788417 |
Summary: | High-resolution analyses of rock magnetic and sedimentological parameters were conducted on an 11 m long sediment core from Lama Lake, Northern Siberia, which encompasses the late Pleistocene and the Holocene epochs. The results reveal a strong link between the median grain size of the magnetic particles, identified as magnetite, and the oxidation state of the sediment. Reducing conditions associated with a relative high total organic carbon (TOC) content of the sediment characterize the upper 7 m of the core (~ Holocene), and these have led to a partial dissolution of detrital magnetite grains, and a homogenization of grain-size-related rock magnetic parameters. The anoxic sediments are characterized by significantly larger median magnetic grain sizes, as indicated, for example, by lower median destructive fields of the natural remanent magnetization (MDFNRM) and lower ratios of saturation remanence to saturation magnetization (MSR/MS). Consequently, estimates of relative geomagnetic palaeointensity ... : Supplement to: Nowaczyk, Norbert R; Harwart, Stefanie K; Melles, Martin (2001): Impact of early diagenesis and bulk particle grain size distribution on estimates of relative geomagnetic paleointensity variations in sediments from Lama Lake, northern Central Siberia. Geophysical Journal International, 145(1), 300-306 ... |
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