A 400-ka tephrochronological framework for Central America from Lake Peten Itza (Guatemala) sediments

QUATERNARY SCIENCE REVIEWS

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Article

Kutterolf, S.¹  Schindlbeck, J. C.¹  Anselmetti, F. S.^2,3  Ariztegui, D.⁴  Brenner, M.^5,6  Curtis, J.^5,6  Schmid, D.^2,3  Hodell, D. A.⁷  Mueller, A.⁸  Perez, L.⁹  Perez, W.¹  Schwalb, A.¹⁰  Frische, M.¹  Wang, K. -L.¹¹ 

[1] GEOMAR Helmholtz Ctr Ocean Res Kiel, D-24148 Kiel, Germany

[2] Univ Bern, Inst Geol Sci, Bern, Switzerland

[3] Univ Bern, Oeschger Ctr Climate Change Res, Bern, Switzerland

[4] Univ Geneva, Dept Earth Sci, Rue Maraichers 13, CH-1205 Geneva, Switzerland

[5] Univ Florida, Dept Geol Sci, Gainesville, FL 32611 USA

[6] Univ Florida, LUECI, Gainesville, FL 32611 USA

[7] Univ Cambridge, Dept Earth Sci, Cambridge, England

[8] ETH, Swiss Fed Inst Technol, CH-8092 Zurich, Switzerland

[9] Univ Nacl Autonoma Mexico, Inst Geol, Mexico City, DF, Mexico

[10] Tech Univ Carolo Wilhelmina Braunschweig, Inst Geosyst & Bioindicat IGeo, Braunschweig, Germany

[11] Acad Sinica, Inst Earth Sci, Taipei 11529, Taiwan

关键词: ICDP;    Peten Itza;    Tephrochronology;    CAVA;    Paleoclimate;    Explosive volcanism;   

DOI  :  10.1016/j.quascirev.2016.08.023

来源: Elsevier

【 摘 要 】

Lake Peten Itza, northern Guatemala, lies within a hydrologically closed basin in the south-central area of the Yucatan Peninsula, and was drilled under the auspices of the International Continental Scientific Drilling Program (ICDP) in 2006. At 16 degrees 55'N latitude, the lake is ideally located for study of past climate and environmental conditions in the Neotropical lowlands. Because of its great depth (>160 m), Lake Peter) Itza has a record of continuous sediment accumulation that extends well into the late Pleistocene. A key obstacle to obtaining long climate records from the region is the difficulty of establishing a robust chronology beyond similar to 40 ka, the limit of C-14 dating. Tephra layers within the Lake Peten Itza sediments, however, enable development of age/depth relations beyond 40 ka. Ash beds from large-magnitude, Pleistocene-to-Holocene silicic eruptions of caldera volcanoes along the Central American Volcanic Arc (CAVA) were found throughout drill cores collected from Lake Peten Itza. These ash beds were used to establish a robust chronology extending back 400 ka. We used major- and trace-element glass composition to establish 12 well-constrained correlations between the lacustrine tephra layers in Lake Peten Itza sediments and dated deposits at the CAVA source volcanoes, and with their marine equivalents in eastern Pacific Ocean sediments. The data also enabled revision of eight previous determinations of erupted volumes and masses, and initial estimates for another four eruptions, as well as the designation of source areas for 14 previously unknown eruptions. The new and revised sedimentation rates for the older sediment successions identify the interglacial of MIS5a between 84 and 72 ka, followed by a stadial between 72 and 59 ka that corresponds to MIS4. We modified the age models for the Lake Peten Itza sediment sequences, extended the paleoclimate and paleoecological record for this Neotropical region to similar to 400 ka, and determined the magnitude and timing of CAVA eruptions. (C) 2016 Elsevier Ltd. All rights reserved.

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