Carbonate and organic matter sedimentation and isotopic signatures in Lake Chungará, Chilean altiplano, during the last 12.3 kyr

61 páginas, 9 figuras, 3 tablas.-- El PDF del artículo es su versión post-print.

Detalles Bibliográficos
Autores: Pueyo Mur, Juan José, Sáez, Alberto, Giralt, Santiago, Valero-Garcés, Blas L., Moreno Caballud, Ana, Bao, Roberto, Schwalb, Antje, Herrera, Christian, Klosowska, Bogumila, Taberner, Conxita
Tipo de recurso: artículo
Fecha de publicación:2011
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/36533
Acceso en línea:http://hdl.handle.net/10261/36533
Access Level:acceso abierto
Palabra clave:Carbonate precipitation
DIC speciation
Methanogenesis
Paleoenvironmental changes
Holocene record
Andean Altiplano
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network_name_str España
repository_id_str
dc.title.none.fl_str_mv Carbonate and organic matter sedimentation and isotopic signatures in Lake Chungará, Chilean altiplano, during the last 12.3 kyr
title Carbonate and organic matter sedimentation and isotopic signatures in Lake Chungará, Chilean altiplano, during the last 12.3 kyr
spellingShingle Carbonate and organic matter sedimentation and isotopic signatures in Lake Chungará, Chilean altiplano, during the last 12.3 kyr
Pueyo Mur, Juan José
Carbonate precipitation
DIC speciation
Methanogenesis
Paleoenvironmental changes
Holocene record
Andean Altiplano
title_short Carbonate and organic matter sedimentation and isotopic signatures in Lake Chungará, Chilean altiplano, during the last 12.3 kyr
title_full Carbonate and organic matter sedimentation and isotopic signatures in Lake Chungará, Chilean altiplano, during the last 12.3 kyr
title_fullStr Carbonate and organic matter sedimentation and isotopic signatures in Lake Chungará, Chilean altiplano, during the last 12.3 kyr
title_full_unstemmed Carbonate and organic matter sedimentation and isotopic signatures in Lake Chungará, Chilean altiplano, during the last 12.3 kyr
title_sort Carbonate and organic matter sedimentation and isotopic signatures in Lake Chungará, Chilean altiplano, during the last 12.3 kyr
dc.creator.none.fl_str_mv Pueyo Mur, Juan José
Sáez, Alberto
Giralt, Santiago
Valero-Garcés, Blas L.
Moreno Caballud, Ana
Bao, Roberto
Schwalb, Antje
Herrera, Christian
Klosowska, Bogumila
Taberner, Conxita
author Pueyo Mur, Juan José
author_facet Pueyo Mur, Juan José
Sáez, Alberto
Giralt, Santiago
Valero-Garcés, Blas L.
Moreno Caballud, Ana
Bao, Roberto
Schwalb, Antje
Herrera, Christian
Klosowska, Bogumila
Taberner, Conxita
author_role author
author2 Sáez, Alberto
Giralt, Santiago
Valero-Garcés, Blas L.
Moreno Caballud, Ana
Bao, Roberto
Schwalb, Antje
Herrera, Christian
Klosowska, Bogumila
Taberner, Conxita
author2_role author
author
author
author
author
author
author
author
author
dc.subject.none.fl_str_mv Carbonate precipitation
DIC speciation
Methanogenesis
Paleoenvironmental changes
Holocene record
Andean Altiplano
topic Carbonate precipitation
DIC speciation
Methanogenesis
Paleoenvironmental changes
Holocene record
Andean Altiplano
description 61 páginas, 9 figuras, 3 tablas.-- El PDF del artículo es su versión post-print.
publishDate 2011
dc.date.none.fl_str_mv 2011
2011
2011
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/36533
url http://hdl.handle.net/10261/36533
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv http://dx.doi.org/10.1016/j.palaeo.2011.05.036
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
_version_ 1869418266869366784
spelling Carbonate and organic matter sedimentation and isotopic signatures in Lake Chungará, Chilean altiplano, during the last 12.3 kyrPueyo Mur, Juan JoséSáez, AlbertoGiralt, SantiagoValero-Garcés, Blas L.Moreno Caballud, AnaBao, RobertoSchwalb, AntjeHerrera, ChristianKlosowska, BogumilaTaberner, ConxitaCarbonate precipitationDIC speciationMethanogenesisPaleoenvironmental changesHolocene recordAndean Altiplano61 páginas, 9 figuras, 3 tablas.-- El PDF del artículo es su versión post-print.Sediments in lakes in the Andean volcanic setting are often made up of diatomaceous ooze together with volcaniclastics and small amounts of carbonates. Despite their scarcity, carbonates along with organic matter provide significant paleoenvironmental information about lake systems. This study focuses on the carbonates in Lake Chungará, their morphologies, distribution and origin deduced from the isotopic markers. These markers reflected changes in the water and the biomass between the onset of the Holocene and around 9.6 cal kyr BP. These changes are marked by general increases in TOC, TN, and TN-δ15NAIR, and by fluctuating values of TOC-δ13CVPDB in its sediments and are probably related to major shifts in the lake surface/volume associated with rises in lake level. An increase in salinity around 10 cal kyr BP is thought to be linked to a short dry period, giving rise to the onset of carbonate production. The mid-Holocene arid period between 7.3 and 3.5 cal ka BP, with a maximum of aridity around 6.0 cal kyr BP, was deduced from δ18OVPDB values in the endogenic carbonates. These results match the reconstructions in Lake Titicaca based on benthic diatoms and paleoshore levels. Offshore sediments mainly consist of a diatomaceous ooze, laminated in the lower half (Unit 1), and banded-massive with tephra layers in the upper half of the sequence (Unit 2). TOC-δ13CVPDB and the C/N ratio confirm that phytoplankton was the main source of organic matter in these sediments. Shallower sediments (Units 3 to 5) developed in platform and littoral settings, providing evidence of subaqueous macrophytes and, to a lesser extent, land plants. Carbonate content ranges between 0.1 and 6 wt % in offshore settings (30 to 40 m water-depth) and reaches the maximum values in the lower part of Unit 2. Carbonate minerals (low magnesium calcite and minor amounts of high magnesium calcite and aragonite) are scarce and are arranged in mm-thick layers, commonly forming cm-thick levels or bioclasts. Carbonate layers are made up of euhedral-to-subhedral spindle-shaped calcite crystals and, to a lesser extent, aragonite needles, all in the μm range. Aragonite spheroids coexist in littoral sediments with other carbonate shapes and charophyte remains, where carbonate reaches locally up to 20 wt%. CO2 photosynthetic depletions related to seasonal phytoplankton blooms were responsible for the high frequency deposition of mm-thick carbonate layers. The average values for δ13CVPDB in lake water, plankton and sediments of Lake Chungará (as organic matter or as carbonate) are around 15 ‰ higher than commonly reported values in other lakes. This 13C enrichment is attributed to carbon assimilation from a DIC affected by methanogenesis, in which HCO3- is the dominant species. The δ13CVPDB and δ18OVPDB variations and their covariation in endogenic carbonates suggest that lake water volume and lake level increased along the Holocene.This work has been funded by the Spanish Ministry of Science and Education through the projects: ANDESTER (BTE2001-3225), LAVOLTER (CGL2004-00683/BTE) and GEOBILA (CGL2007, 60932/BTE), and by the Catalan Autonomous Government through the 2009SGR1451 project. A. Moreno also acknowledges the funding from the Marie Curie fellowship, OIF proposal 021673.Peer reviewedElsevier201120112011info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501http://hdl.handle.net/10261/36533reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Ingléshttp://dx.doi.org/10.1016/j.palaeo.2011.05.036info:eu-repo/semantics/openAccessoai:digital.csic.es:10261/365332026-05-22T06:33:51Z
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