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Unraveling sea-level variations and tectonic uplift in wave-built marine terraces, Santa Maria Island, Chile

  • The architecture of coastal sequences in tectonically-active regions results mostly from a combination of sea-level and land-level changes. The objective of this study is to unravel these signals by combining sequence stratigraphy and sedimentology of near-shore sedimentary sequences in wave-built terraces. We focus on Santa Maria Island at the south-central Chile margin, which hosts excellent exposures of coastal sediments from Marine Isotope Stage 3. A novel method based on statistical analysis of grain-size distributions coupled with fades descriptions provided a detailed account of transgressive-regressive cycles. Radiocarbon ages from paleosols constrain the chronology between >53 and similar to 31 cal ka BP. Because the influence of glaciations can be neglected, we calculated relative sea-level curves by tying the onset of deposition on a bedrock abrasion platform to a global sea-level curve. The observed depositional cycles match those predicted for uplift rates between 1.2 and 1.8 m/ka. The studied sedimentary units representThe architecture of coastal sequences in tectonically-active regions results mostly from a combination of sea-level and land-level changes. The objective of this study is to unravel these signals by combining sequence stratigraphy and sedimentology of near-shore sedimentary sequences in wave-built terraces. We focus on Santa Maria Island at the south-central Chile margin, which hosts excellent exposures of coastal sediments from Marine Isotope Stage 3. A novel method based on statistical analysis of grain-size distributions coupled with fades descriptions provided a detailed account of transgressive-regressive cycles. Radiocarbon ages from paleosols constrain the chronology between >53 and similar to 31 cal ka BP. Because the influence of glaciations can be neglected, we calculated relative sea-level curves by tying the onset of deposition on a bedrock abrasion platform to a global sea-level curve. The observed depositional cycles match those predicted for uplift rates between 1.2 and 1.8 m/ka. The studied sedimentary units represent depositional cycles that resulted in reoccupation events of an existing marine terrace. Our study demonstrates wave-built marine terrace deposits along clastic shorelines in temperate regions can be used to distinguish between tectonic uplift and climate-induced sea-level changes.show moreshow less

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Metadaten
Author:Julius Jara-Munoz, Daniel MelnickORCiDGND
DOI:https://doi.org/10.1016/j.yqres.2014.10.002
ISSN:0033-5894 (print)
ISSN:1096-0287 (online)
Parent Title (English):Quaternary research : an interdisciplinary journal
Publisher:Elsevier
Place of publication:San Diego
Document Type:Article
Language:English
Year of first Publication:2015
Year of Completion:2015
Release Date:2017/03/27
Tag:Coastal sedimentation; Marine terraces; Sea-level change; Tectonic uplift; Terrace reoccupation; Wave-built terraces
Volume:83
Issue:1
Pagenumber:13
First Page:216
Last Page:228
Funder:Federal Ministry of Education and Research; MARISCOS (MAule eaRthquake: Integration of Seismic Cycle Observations and Structural investigations) project from the German Science Foundation (DFG) [STR 373/30-1]; German Science Foundation (DFG) [ME 3157/2-2]
Organizational units:Mathematisch-Naturwissenschaftliche Fakultät / Institut für Erd- und Umweltwissenschaften
Peer Review:Referiert