Paleointensities of sediment core PG1111, Lama Lake, northern Central Siberia, 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
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...
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ftdatacite:10.1594/pangaea.788417 2023-05-15T15:17:43+02:00 Paleointensities of sediment core PG1111, Lama Lake, northern Central Siberia, 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 Nowaczyk, Norbert R Harwart, Stefanie K Melles, Martin 2001 application/zip https://dx.doi.org/10.1594/pangaea.788417 https://doi.pangaea.de/10.1594/PANGAEA.788417 en eng PANGAEA - Data Publisher for Earth & Environmental Science https://dx.doi.org/10.1046/j.0956-540x.2001.01388.x Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/legalcode cc-by-3.0 CC-BY Composite Core RU-Land_1993_Norilsk_Taymyr AWI Arctic Land Expedition GeoForschungszentrum Potsdam GFZ Permafrost Research Periglacial Dynamics @ AWI AWI_PerDyn Quaternary Environment of the Eurasian North QUEEN article Supplementary Collection of Datasets Collection 2001 ftdatacite https://doi.org/10.1594/pangaea.788417 https://doi.org/10.1046/j.0956-540x.2001.01388.x 2022-02-09T12:07:01Z 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 variations yielded large amplitude shifts associated with anoxic/oxic boundaries. Despite the partial reductive dissolution of magnetic particles within the anoxic section, and consequent minimal variations in magnetic concentration and grain size, palaeointensity estimates for this part of the core were still lithologically distorted by the effects of particle size (and subsidiary TOC) variations. Anomalously high values coincide with an interval of significantly more fine-grained sediment, which is also associated with a decrease in TOC content, which may thus imply a decreased level of magnetite dissolution in this interval. Calculation of relative palaeointensity estimates therefore seems to be compromised by a combined effect of shifts in the particle size distribution of the bulk sediment and by partial magnetite dissolution varying in association with the TOC content of the sediment. Article in Journal/Newspaper Arctic permafrost Siberia DataCite Metadata Store (German National Library of Science and Technology) Arctic |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
English |
topic |
Composite Core RU-Land_1993_Norilsk_Taymyr AWI Arctic Land Expedition GeoForschungszentrum Potsdam GFZ Permafrost Research Periglacial Dynamics @ AWI AWI_PerDyn Quaternary Environment of the Eurasian North QUEEN |
spellingShingle |
Composite Core RU-Land_1993_Norilsk_Taymyr AWI Arctic Land Expedition GeoForschungszentrum Potsdam GFZ Permafrost Research Periglacial Dynamics @ AWI AWI_PerDyn Quaternary Environment of the Eurasian North QUEEN Nowaczyk, Norbert R Harwart, Stefanie K Melles, Martin Paleointensities of sediment core PG1111, Lama Lake, northern Central Siberia, 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 |
topic_facet |
Composite Core RU-Land_1993_Norilsk_Taymyr AWI Arctic Land Expedition GeoForschungszentrum Potsdam GFZ Permafrost Research Periglacial Dynamics @ AWI AWI_PerDyn Quaternary Environment of the Eurasian North QUEEN |
description |
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 variations yielded large amplitude shifts associated with anoxic/oxic boundaries. Despite the partial reductive dissolution of magnetic particles within the anoxic section, and consequent minimal variations in magnetic concentration and grain size, palaeointensity estimates for this part of the core were still lithologically distorted by the effects of particle size (and subsidiary TOC) variations. Anomalously high values coincide with an interval of significantly more fine-grained sediment, which is also associated with a decrease in TOC content, which may thus imply a decreased level of magnetite dissolution in this interval. Calculation of relative palaeointensity estimates therefore seems to be compromised by a combined effect of shifts in the particle size distribution of the bulk sediment and by partial magnetite dissolution varying in association with the TOC content of the sediment. |
format |
Article in Journal/Newspaper |
author |
Nowaczyk, Norbert R Harwart, Stefanie K Melles, Martin |
author_facet |
Nowaczyk, Norbert R Harwart, Stefanie K Melles, Martin |
author_sort |
Nowaczyk, Norbert R |
title |
Paleointensities of sediment core PG1111, Lama Lake, northern Central Siberia, 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 |
title_short |
Paleointensities of sediment core PG1111, Lama Lake, northern Central Siberia, 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 |
title_full |
Paleointensities of sediment core PG1111, Lama Lake, northern Central Siberia, 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 |
title_fullStr |
Paleointensities of sediment core PG1111, Lama Lake, northern Central Siberia, 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 |
title_full_unstemmed |
Paleointensities of sediment core PG1111, Lama Lake, northern Central Siberia, 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 |
title_sort |
paleointensities of sediment core pg1111, lama lake, northern central siberia, 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 |
publisher |
PANGAEA - Data Publisher for Earth & Environmental Science |
publishDate |
2001 |
url |
https://dx.doi.org/10.1594/pangaea.788417 https://doi.pangaea.de/10.1594/PANGAEA.788417 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic permafrost Siberia |
genre_facet |
Arctic permafrost Siberia |
op_relation |
https://dx.doi.org/10.1046/j.0956-540x.2001.01388.x |
op_rights |
Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/legalcode cc-by-3.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/pangaea.788417 https://doi.org/10.1046/j.0956-540x.2001.01388.x |
_version_ |
1766347962178338816 |