Holocene relative sea-level change along the tectonically active Chilean coast

QUATERNARY SCIENCE REVIEWS

卷:236

Article

Garrett, Ed¹  Melnick, Daniel²  Dura, Tina³  Cisternas, Marco⁴  Ely, Lisa L.⁵  Wesson, Robert L.⁶  Jara-Munoz, Julius⁷  Whitehouse, Pippa L.⁸ 

[1] Univ York, Dept Environm & Geog, York, N Yorkshire, England

[2] Univ Austral Chile, Inst Ciencias Tierra, TAQUACh, Valdivia, Chile

[3] Virginia Tech, Dept Geosci, Blacksburg, VA USA

[4] Pontificia Univ Catolica Valparaiso, Inst Geog, Valparaiso, Chile

[5] Cent Washington Univ, Dept Geol Sci, Ellensburg, WA USA

[6] US Geol Survey, Box 25046, Denver, CO 80225 USA

[7] Univ Potsdam, Dept Earth & Environm Sci, Potsdam, Germany

[8] Univ Durham, Dept Geog, Durham, England

关键词: Holocene;    Sea-level changes;    South America;    Data analysis;    Sea-level database;    Glacial isostatic adjustment;    Tectonics;   

DOI  :  10.1016/j.quascirev.2020.106281

来源: Elsevier

【 摘 要 】

We present a comprehensive relative sea-level (RSL) database for north, central, and south-central Chile (18.5 degrees S - 43.6 degrees S) using a consistent, systematic, and internationally comparable approach. Despite its latitudinal extent, this coastline has received little rigorous or systematic attention and details of its RSL history remain largely unexplored. To address this knowledge gap, we re-evaluate the geological context and age of previously published sea-level indicators, providing 78 index points and 84 marine or terrestrial limiting points spanning from 11 ka to the present day. Many data points were originally collected for research in other fields and have not previously been examined for the information they provide on sea-level change. Additionally, we describe new sea-level data from four sites located between the Gulf of Arauco and Valdivia. By compiling RSL histories for 11 different regions, we summarise current knowledge of Chilean RSL. These histories indicate mid Holocene sea levels above present in all regions, but at highly contrasting elevations from similar to 30 m to <5 m. We compare the spatiotemporal distribution of sea-level data points with a suite of glacial isostatic adjustment models and place first-order constraints on the influence of tectonic processes over 10(3)-10(4) year timescales. While seven regions indicate uplift rates <1 m ka(-1), the remaining regions may experience substantially higher rates. In addition to enabling discussion of the factors driving sea-level change, our compilation provides a resource to assist attempts to understand the distribution of archaeological, palaeoclimatic, and palaeoseismic evidence in the coastal zone and highlights directions for future sea-level research in Chile. (C) 2020 Elsevier Ltd. All rights reserved.

【 授权许可】

Free