First paleomagnetic results of mid-to late Holocene sediments from Lake Issyk-Kul (Kyrgyzstan): implications for paleosecular variation in central Asia

Show simple item record Gómez Paccard, Miriam Larrasoaña Gorosquieta, Juan Cruz Giralt Romeu, Santiago Roberts, Andrew P. 2020-09-17T14:56:28Z 2020-09-17T14:56:28Z 2012-03-23
dc.identifier.citation Geochemistry, Geophysics, Geosystems, vol.13, n.3, 1-18 es_ES
dc.identifier.issn 1525-2027
dc.description.abstract We present new paleomagnetic and rock magnetic data from mid and late Holocene sediments recovered in two gravity cores (C087 and C142a) from Lake Issyk-Kul (central Asia), for which independent radiocarbon-based age models are available. Our results indicate that sediments from core C087 are characterized by fine (pseudo single domain) magnetite grains and are reliable recorders of Holocene geomagnetic paleosecular variation (PSV) in central Asia, which is a region with poor data coverage. Similarity is found between the core C087 PSV record, which spans the last 5700 years, and the Lake Baikal PSV record, which is the only published Holocene central Asian PSV record of comparable length with an independent radiocarbon-based chronology. Our new results represent a step forward in constructing a reference PSV curve for central Asia that can be used to date sedimentary sequences. These results can also be used to improve the reliability and accuracy of global geomagnetic field models. We have not been able to disentangle past environmental changes in the Lake Issyk-Kul region based on rock magnetic properties, probably because the magnetite and hematite in the studied sediments have a mixed (fluvial and eolian) terrigenous origin es_ES
dc.description.sponsorship Institut de Ciències de la Terra Jaume Almera, España es_ES
dc.description.sponsorship Unidad de Zaragoza, Instituto Geológico y Minero de España, España es_ES
dc.description.sponsorship Research School of Earth Sciences, Australian National University, Australia es_ES
dc.language.iso en es_ES
dc.publisher American Geophysical Union es_ES
dc.publisher Geochemical Society es_ES
dc.relation CSD2007-00067 es_ES
dc.relation EU ICA2-CT-2000-10003 es_ES
dc.relation CGL2008-02203/BTE es_ES
dc.relation CGL2008-02203/BTE es_ES
dc.rights Acceso abierto es_ES
dc.subject Holocene es_ES
dc.subject central Asia es_ES
dc.subject lacustrine sediments es_ES
dc.subject paleomagnetism es_ES
dc.subject rock magnetism es_ES
dc.subject secular variation es_ES
dc.subject Lake Issyk-Kul es_ES
dc.title First paleomagnetic results of mid-to late Holocene sediments from Lake Issyk-Kul (Kyrgyzstan): implications for paleosecular variation in central Asia es_ES
dc.type Postprint es_ES
dc.relation.publisherversion es_ES
dc.description.funder Programa Junta para la Ampliación de Estudios, Consejo Superior de Investigaciones Científicas, España es_ES
dc.description.funder Programa Consolider Ingenio, España es_ES
dc.identifier.doi es_ES
dc.coverage.spatialStudy Lago Issyk-Kul, Kirguistán, Asia es_ES

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