Holocene geomagnetic secular variations recorded by sediments from Escondido Lake (south Argentina)
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- Gogorza C. S. G.
- IFAS-UNCPBA
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- Sinito A. M.
- IFAS-UNCPBA CONICET
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- Tommaso I. Di
- Laboratorio Daniel Valencio-UBA - Ciudad Universitaria
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- Vilas J. F.
- Laboratorio Daniel Valencio-UBA - Ciudad Universitaria CONICET
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- Creer K. M.
- Department of Geology and Geophysics, University of Edinburgh
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- Nuñez H.
- Instituto Antartico Argentino
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説明
Paleomagnetic and sedimentological studies carried out on two short cores and nine long cores from the bottom sediments from Escondido Lake (south-western Argentina) are described. <BR>Rock magnetic analysis suggests that the main carriers of magnetization seems to be ferrimagnetic minerals, predominantly pseudo single domain magnetite. The presence of greigite, as diagenetic euxinic material, is also suggested. <BR>Calibrated ages were calculated from radiocarbon dating and a transfer function shortened depth-age is built, which suggests the existence of a hiatus, supported by the suggestion of previous palynological studies about the possible evidence of the younger Dryas cooling event seen in the Antarctic ice cores. <BR>The stacked inclination and declination curves and their standard deviations using arithmetical average after chronostratigraphic correlations are made. <BR>Inclination data show two well defined periods: a long period (about 7700 years) and a short one (between 2660 and 2900 years). Declination data show two intermediate periods (about 3600 and 2900 years respectively) and a long, although less reliable, period (about 10000 years). The longer periods may be related to dipolar variations, while the shorter periods may be associated to non dipolar variations.
収録刊行物
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- Earth, Planets and Space
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Earth, Planets and Space 51 (2), 93-106, 1999
地球電磁気・地球惑星圏学会 、公益社団法人 日本地震学会、特定非営利活動法人 日本火山学会、日本測地学会、日本惑星科学会
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詳細情報 詳細情報について
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- CRID
- 1390282681485751936
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- NII論文ID
- 10003737241
- 130003955979
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- NII書誌ID
- AA11211921
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- COI
- 1:CAS:528:DyaK1MXjsV2lt7w%3D
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- ISSN
- 18805981
- 13438832
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- NDL書誌ID
- 4681716
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- 使用不可