Moraines and marls: Giant landslides of the Lago Pueyrredon valley in Patagonia, Argentina

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61988987%3A17310%2F20%3AA21028JH" target="_blank" >RIV/61988987:17310/20:A21028JH - isvavai.cz</a>

Result on the web

<a href="https://www.sciencedirect.com/science/article/pii/S0277379120305606" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0277379120305606</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.quascirev.2020.106598" target="_blank" >10.1016/j.quascirev.2020.106598</a>

Result language

angličtina

Original language name

Moraines and marls: Giant landslides of the Lago Pueyrredon valley in Patagonia, Argentina

Original language description

Giant catastrophic landslides (>108 m3) dot the formerly glaciated mountain forelands of the eastern Patagonian Andes. From geomorphic mapping, sedimentological logs and radiocarbon dating, we infer the emplacement kinematics and approximate timing of giant landslides in moraines and other glacial deposits in the Lago Pueyrredón valley (LPV), Argentina. For the first time, we report in detail examples of giant low-gradient landslides with hummocky lobes derived from unconsolidated glacial deposits and weak bedrock. We find that at least 4.5 km3 of debris and weak bedrock were mobilized by slope failures in an area of ~500 km2 since the Last Glacial Maximum (LGM; ~25–18 ka). Nearly 90% of this landslide volume originated along the shores of, or as subaqueous failures in, a postglacial moraine-dammed meltwater lake. The larger landslides (>1 km3) detached from moraines fringing the lake, whereas other landslides displaced glacial and lake deposits either on the paleolake bed, or in a river gorge that was cut upon drainage of the glacial lake. Sequences of till, glaciofluvial and glaciolacustrine deposits overlying weak Early Miocene marlstone are mostly conducive to major landslides in the LPV. Cross-cutting relationships indicate that largest landslides in the area originated during rapid glacial lake-level drops. Distribution and internal structure of hummocks within landslide lobes suggest that these landslides were emplaced as catastrophic debris avalanches. It suggests that giant catastrophic landslides in the glacier forelands of Patagonia can result from layered weak rocks, changes in meltwater-lake levels, and possibly as a consequence of strong earthquakes linked to rapid post-glacial rebound following the retreat of the Patagonian Ice Sheet (PIS).

Czech name

—

Czech description

—

Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10508 - Physical geography

Project

<a href="/en/project/GA19-16013S" target="_blank" >GA19-16013S: Giant landslides in glacier foreland: missing story in the evolution of Patagonian Ice Sheet and related glacial lakes</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2020

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

QUATERNARY SCI REV

ISSN

0277-3791

e-ISSN

—

Volume of the periodical

248

Issue of the periodical within the volume

November

Country of publishing house

NL - THE KINGDOM OF THE NETHERLANDS

Number of pages

15

Pages from-to

106598

UT code for WoS article

000582803000019

EID of the result in the Scopus database

2-s2.0-85091784788