Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/18382
Share/Export:
logo share SHARE logo core CORE BASE
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL | DATACITE
Title

The palaeohydrological evolution of Lago Chungara´ (Andean Altiplano, northern Chile) during the Lateglacial and early Holocene using oxygen isotopes in diatom silica

AuthorsHernández, Armand CSIC ORCID ; Bao, Roberto; Giralt, Santiago CSIC ORCID ; Leng, Melanie J.; Barker, Philip A.; Sáez, Alberto; Pueyo Mur, Juan José; Moreno Caballud, Ana CSIC ORCID ; Valero-Garcés, Blas L. CSIC ORCID ; Sloane, Hilary J.
KeywordsDiatom ooze
Laminated sediments
Oxygen isotopes
Rhythmites
Holocene
Andean Altiplano
Issue DateMay-2008
PublisherWiley-Blackwell
CitationJOURNAL OF QUATERNARY SCIENCE 23(4): 351–363 (2008)
AbstractOxygen isotopes of diatom silica and petrographical characterisation of diatomaceous laminated sediments of Lago Chungará (northern Chilean Altiplano) have allowed us to establish its palaeohydrological evolution during the Lateglacial-early Holocene (ca. 12 000-9400 cal. yr BP). These laminated sediments are composed of light and dark pluriannual couplets of diatomaceous ooze formed by different processes. Light sediment laminae accumulated during short-term diatom blooms whereas dark sediment laminae represent the baseline limnological conditions during several years of deposition. Oxygen isotope analysis of the dark diatom laminae show a general 18O enrichment trend during the studied period. Comparison of these 18Odiatom values with the previously published lake-level evolution suggests a correlation between 18Odiatom and the precipitation:evaporation ratio, but also with the evolution of other local hydrological factors as changes in the groundwater outflow as well as shifts in the surface:volume ratio of Lago Chungará. The lake expanded (probably increasing this ratio) during the rising lake-level trend due to changes in its morphology, enhancing evaporation. Furthermore, the lake's hydrology was probably modified as the groundwater outflow became sealed by sediments, increasing lake water residence time and potential evaporation. Both factors could cause isotope enrichment.
Publisher version (URL)http://www3.interscience.wiley.com/journal/118902447/abstract
URIhttp://hdl.handle.net/10261/18382
DOI10.1002/jqs.1173
ISSN0267-8179
Appears in Collections:(Geo3Bcn) Artículos

Show full item record
Review this work

SCOPUSTM   
Citations

15
checked on May 24, 2022

WEB OF SCIENCETM
Citations

15
checked on May 20, 2022

Page view(s)

412
checked on May 24, 2022

Google ScholarTM

Check

Altmetric

Dimensions


WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.