Rock magnetic record from Lama Lake
An 11 m long sediment core ftorn Lama Lake, Northern Siberia, has been subjected to intense sedimentological, geochemical and rock magnetic analyses. According to a palynologic investigation the recovered sediments cover the whole Holocene and the late Pleistocene reaching back to about 17 ka. IRM a...
Main Authors: | , , |
---|---|
Format: | Dataset |
Language: | English |
Published: |
PANGAEA
2000
|
Subjects: | |
Online Access: | https://doi.pangaea.de/10.1594/PANGAEA.787615 https://doi.org/10.1594/PANGAEA.787615 |
id |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.787615 |
---|---|
record_format |
openpolar |
spelling |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.787615 2023-05-15T15:10:43+02:00 Rock magnetic record from Lama Lake Nowaczyk, Norbert R Harwart, Stefanie K Melles, Martin LATITUDE: 69.548000 * LONGITUDE: 90.211000 * DATE/TIME START: 1993-01-01T00:00:00 * DATE/TIME END: 1993-01-01T00:00:00 2000-08-22 application/zip, 4 datasets https://doi.pangaea.de/10.1594/PANGAEA.787615 https://doi.org/10.1594/PANGAEA.787615 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.787615 https://doi.org/10.1594/PANGAEA.787615 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Nowaczyk, Norbert R; Harwart, Stefanie K; Melles, Martin (2000): A rock magnetic record from Lama Lake, Taymyr Peninsula, northern Central Siberia. Journal of Paleolimnology, 23(3), 227-241, https://doi.org/10.1023/A:1008052106454 AWI_PerDyn AWI Arctic Land Expedition COMPCORE Composite Core GeoForschungszentrum Potsdam GFZ Norilsk/Taymyr Sibiria Norilsk/Taymyr93 Permafrost Research (Periglacial Dynamics) @ AWI PG1111 Quaternary Environment of the Eurasian North QUEEN RU-Land_1993_Norilsk_Taymyr Dataset 2000 ftpangaea https://doi.org/10.1594/PANGAEA.787615 https://doi.org/10.1023/A:1008052106454 2023-01-20T07:32:40Z An 11 m long sediment core ftorn Lama Lake, Northern Siberia, has been subjected to intense sedimentological, geochemical and rock magnetic analyses. According to a palynologic investigation the recovered sediments cover the whole Holocene and the late Pleistocene reaching back to about 17 ka. IRM acquisition experiments, hysteresis loop and back field as well as thermomagnetic measurements revealed magnetite in the pseudo-single domain range as the only remanence carrier. Sharp rock magnetic boundaries occur at 20 and 745 cm sub-bottom depth that are clearly linked to shifts in the median grain size of the magnetite. These boundaries are close to the present boundaries that bracket an anoxic zone between the subrecent and a late Pleistocene oxic section of the sediments. Within the anoxic section, magnetites are characterized by significantly larger median grain sizes but within a very narrow grain size range. The shift from fine grained magnetite within the oxic sediments to coarse grained magnetite is interpreted as the result of dissolution of the finest magnetite grains within the anoxic sediments. A significant shift of the Ti/Fe-ratio of the bulk sediment at a sub-bottom depth of 735 cm does not correspond to thermomagnetic properties, i.e. Curie-temperatures do not follow the variable Ti-content of the sediment. Dataset Arctic norilsk permafrost Taymyr Siberia PANGAEA - Data Publisher for Earth & Environmental Science Arctic Norilsk ENVELOPE(88.203,88.203,69.354,69.354) Taymyr ENVELOPE(89.987,89.987,68.219,68.219) ENVELOPE(90.211000,90.211000,69.548000,69.548000) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
AWI_PerDyn AWI Arctic Land Expedition COMPCORE Composite Core GeoForschungszentrum Potsdam GFZ Norilsk/Taymyr Sibiria Norilsk/Taymyr93 Permafrost Research (Periglacial Dynamics) @ AWI PG1111 Quaternary Environment of the Eurasian North QUEEN RU-Land_1993_Norilsk_Taymyr |
spellingShingle |
AWI_PerDyn AWI Arctic Land Expedition COMPCORE Composite Core GeoForschungszentrum Potsdam GFZ Norilsk/Taymyr Sibiria Norilsk/Taymyr93 Permafrost Research (Periglacial Dynamics) @ AWI PG1111 Quaternary Environment of the Eurasian North QUEEN RU-Land_1993_Norilsk_Taymyr Nowaczyk, Norbert R Harwart, Stefanie K Melles, Martin Rock magnetic record from Lama Lake |
topic_facet |
AWI_PerDyn AWI Arctic Land Expedition COMPCORE Composite Core GeoForschungszentrum Potsdam GFZ Norilsk/Taymyr Sibiria Norilsk/Taymyr93 Permafrost Research (Periglacial Dynamics) @ AWI PG1111 Quaternary Environment of the Eurasian North QUEEN RU-Land_1993_Norilsk_Taymyr |
description |
An 11 m long sediment core ftorn Lama Lake, Northern Siberia, has been subjected to intense sedimentological, geochemical and rock magnetic analyses. According to a palynologic investigation the recovered sediments cover the whole Holocene and the late Pleistocene reaching back to about 17 ka. IRM acquisition experiments, hysteresis loop and back field as well as thermomagnetic measurements revealed magnetite in the pseudo-single domain range as the only remanence carrier. Sharp rock magnetic boundaries occur at 20 and 745 cm sub-bottom depth that are clearly linked to shifts in the median grain size of the magnetite. These boundaries are close to the present boundaries that bracket an anoxic zone between the subrecent and a late Pleistocene oxic section of the sediments. Within the anoxic section, magnetites are characterized by significantly larger median grain sizes but within a very narrow grain size range. The shift from fine grained magnetite within the oxic sediments to coarse grained magnetite is interpreted as the result of dissolution of the finest magnetite grains within the anoxic sediments. A significant shift of the Ti/Fe-ratio of the bulk sediment at a sub-bottom depth of 735 cm does not correspond to thermomagnetic properties, i.e. Curie-temperatures do not follow the variable Ti-content of the sediment. |
format |
Dataset |
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 |
Rock magnetic record from Lama Lake |
title_short |
Rock magnetic record from Lama Lake |
title_full |
Rock magnetic record from Lama Lake |
title_fullStr |
Rock magnetic record from Lama Lake |
title_full_unstemmed |
Rock magnetic record from Lama Lake |
title_sort |
rock magnetic record from lama lake |
publisher |
PANGAEA |
publishDate |
2000 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.787615 https://doi.org/10.1594/PANGAEA.787615 |
op_coverage |
LATITUDE: 69.548000 * LONGITUDE: 90.211000 * DATE/TIME START: 1993-01-01T00:00:00 * DATE/TIME END: 1993-01-01T00:00:00 |
long_lat |
ENVELOPE(88.203,88.203,69.354,69.354) ENVELOPE(89.987,89.987,68.219,68.219) ENVELOPE(90.211000,90.211000,69.548000,69.548000) |
geographic |
Arctic Norilsk Taymyr |
geographic_facet |
Arctic Norilsk Taymyr |
genre |
Arctic norilsk permafrost Taymyr Siberia |
genre_facet |
Arctic norilsk permafrost Taymyr Siberia |
op_source |
Supplement to: Nowaczyk, Norbert R; Harwart, Stefanie K; Melles, Martin (2000): A rock magnetic record from Lama Lake, Taymyr Peninsula, northern Central Siberia. Journal of Paleolimnology, 23(3), 227-241, https://doi.org/10.1023/A:1008052106454 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.787615 https://doi.org/10.1594/PANGAEA.787615 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.787615 https://doi.org/10.1023/A:1008052106454 |
_version_ |
1766341687441883136 |