How do sea-level curves influence modeled marine terrace sequences?

QUATERNARY SCIENCE REVIEWS

卷:229

Article

de Gelder, Gino^1,2  Jara-Munoz, Julius³  Melnick, Daniel⁴  Fernandez-Blanco, David^1,5  Rouby, Helene⁶  Pedoja, Kevin⁷  Husson, Laurent²  Armijo, Rolando¹  Lacassin, Robin¹ 

[1] Univ Paris, Inst Phys Globe Paris, CNRS, F-75005 Paris, France

[2] Univ Grenoble Alpes, CNRS, ISTerre, 1381 Rue Piscine, F-38400 St Martin Dheres, France

[3] Univ Potsdam, Inst Geowissensch, Karl Liebknecht Str 24, D-14476 Potsdam, Germany

[4] Univ Austral Chile, Inst Ciencias Tierra, Valdivia 5111430, Chile

[5] Imperial Coll, Dept Earth Sci & Engn, BRG, Prince Consort Rd, London SW7 2BP, England

[6] Ecole Normale Super, Lab Geol, UMR 8538, Paris, France

[7] Univ Caen, CNRS, Lab Morphodynam Continentale & Catiere, F-14000 Caen, France

关键词: Quaternary;    Sea-level changes;    Global;    Coastal geomorphology;    Marine terraces;    Landscape evolution models;    Corinth rift;   

DOI  :  10.1016/j.quascirev.2019.106132

来源: Elsevier

【 摘 要 】

Sequences of uplifted marine terraces are widespread and reflect the interaction between climatic and tectonic processes at multiple scales, yet their analysis is typically biased by the chosen sea-level (SL) curve. Here we explore the influence of Quaternary SL curves on the geometry of marine terrace sequences using landscape evolution models (LEMs). First, we modeled the young, rapidly uplifting sequence at Xylokastro (Corinth Rift; <240 ka; similar to 1.5 mm/yr), which allowed us to constrain terrace ages, model parameters, and best-fitting SL curves. Models that better reproduced the terraced topography used a glacio-isostatically adjusted SL curve based on coral data (for similar to 125 ka), and a eustatic SL curve based on ice-sheet models (for similar to 240 ka). Second, we explored the opposite end-member of older, slower uplifting sequences (2.6 Ma; 0.1-0.2 mm/yr). We find that cliff diffusion is important to model terrace sequence morphology, and that a hydraulic-model based SL curve reproduced observed terrace morphologies best. Third, we modeled the effect of SL noise with various amplitudes and wavelengths on our interpretations, finding that younger, faster uplifting sequences are less noise-sensitive and thus generally more promising for LEM studies. Our results emphasize the importance of testing a variety of SL-curves within marine terrace studies, and highlight that accurate modeling through LEMs may provide valuable insight on climatic and tectonic forcing to Quaternary coastal evolution. (C) 2019 Elsevier Ltd. All rights reserved.

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