Skip to main content
padlock icon - secure page this page is secure

Geomorphodynamics as recorded in a high-Andean cushion peatland of the western Chilean Central Andes (27° S) during the last 1800 cal. yr BP

Buy Article:

$39.00 + tax (Refund Policy)

Due to their location at the southern margin of the Arid Diagonal, only a limited number of archives in the western Central Andes of Chile is capable for paleoclimate investigations. High-altitude cushion peatlands are potentially suitable to fill this gap despite their heterogenic stratigraphies representing past geomorphodynamics, especially for the Late Holocene. We investigated a 4 m sediment profile from the Lagunillas cushion peatland (LP, 27° 12' S, 69° 17' W), located in the dry Puna of the Western Central Andes. Directed by Electrical Resistivity Tomography (ERT) measurements, sediment cores were recovered at the deepest point of the investigated valley section. In total, 10 radiocarbon samples were used to build the age-depth model resulting in a sediment chronology spanning the last 1800 cal. yr BP. Core stratigraphy and ERT data were applied to allow insights into the sedimentary environment. Geochemical (X-ray fluorescence) and sedimentological (grain size) analyses were conducted to identify significant changes in sedimentation dynamics during the Late Holocene. Grain size analyses were investigated on 24 samples from peat layers as well as from stratigraphical sections characterized by allochthonous sediments. In combination with the results of the XRF measurements, evidence for changes in geomorphodynamic processes during the last 1800 cal. yr BP could be revealed. Our data disclose that investigations of heterogenic peat stratigraphies could also provide promising inferences about paleoclimatic changes. Within the Lagunillas record, stable phases of peat accumulation alternate with phases dominated by clastic material input. A stable phase of peat accumulation prevailed from 1750 cal. yr BP until about 1250 cal. yr BP and was followed by a phase with unstable conditions from 1250 to 980 cal. yr BP. During the Medieval Climate Anomaly (MCA) between 980 to 620 cal. yr BP, drier conditions prevailed at Lagunillas peatland, while shorter humid periods favored peat accumulation between 620 to 560 cal. yr BP. Higher precipitation amounts were evident during the Little Ice Age (LIA) from 560 –160 cal. yr BP. During the period from 160 cal. yr BP to recent times, a higher frequency of changes between peat accumulation and clastic layers occurred, presumably due to a decreasing trend in precipitation.
No Reference information available - sign in for access.
No Citation information available - sign in for access.
No Supplementary Data.
No Article Media
No Metrics

Keywords: CENTRAL ANDES; CUSHION PEATLANDS; GEOMORPHODYNAMICS; GRAIN SIZE ANALYSIS; LATE HOLOCENE; PALEOENVIRONMENT

Document Type: Research Article

Publication date: June 1, 2019

More about this publication?
  • Zeitschrift für Geomorphologie main volume is a peer-reviewed international journal presenting original contributions of high scientific standard from all fields of geomorphology, encompassing basic research and applied studies. Zeitschrift für Geomorphologie (ZfG) invites the submission of original papers from the entire field of geomorphological research, both applied and theoretical. Authors are encouraged to submit their papers to the editor-in-chief. Please peruse the instructions to authors (PDF) before submitting your paper.

    Thematic Supplements
    ZFG regularly publishes thematic supplements. These supplement volumes are abstracted and indexed the same way the main volumes are indexed.
  • Editorial Board
  • Information for Authors
  • Subscribe to this Title
  • Ingenta Connect is not responsible for the content or availability of external websites
  • Access Key
  • Free content
  • Partial Free content
  • New content
  • Open access content
  • Partial Open access content
  • Subscribed content
  • Partial Subscribed content
  • Free trial content
Cookie Policy
X
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more