Cerrone, Ciro, Petersen, Ann-Kathrin, Stocchi, Paolo, Rovere, Alessio and Casella, Elisa (2020) 3D mapping of Quaternary coral reef terraces on Curacao Island, Southern Carribean Sea. [Talk] In: EGU General Assembly 2020. , 4-8 May 2020, Vienna .

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Abstract

D etailed geological field mapping is essential for the study of Relative Sea Level (RSL) indicators,
that are in turn the only direct proxies to assess paleo sea level changes and long-term land
movements. In the last decades, traditional mapping methods started to be complemented by
small Remotely Piloted Aircraft Systems (RPAS, a.ka.a. drones) and high-resolution remote sensing
datasets.
In this contribution, we show the results of geological mapping in the island of Curaçao
(Netherlands Antilles). Here, we mapped a staircase sequence of coral reef terraces. In particular,
we used TerraceM-2 Maptools (a Matlab® interface for mapping marine terraces) to extract widescale
marine terrace elevations from TanDEM-X Digital Elevation Models (DEMs) (German
Aerospace Center, DLR and Airbus). We detail the elevation information available for each single
terrace with RPAS data processed with Agisoft Metashape, that allows obtaining as final products
DEMs and orthophotos of selected sites at the inner margin of reef terraces. We then use landbased
photogrammetry coupled with traditional facies analysis to identify geological
discontinuities on the lower terrace.
The facies analysis allowed to precisely map the unconformity between the Hato (MIS 5.5) and
Cortalein (MIS 7) Units (as identified by Muhs et al., 2012). The top of the Hato Unit forms the socalled
“Curaçao Lower Terrace”. The top of the Hato Unit, extending few kilometres from the coast,
has been mapped with both TanDEM-X and RPAS data up to the paleo-cliff of the Middle Terrace
(formerly attributed to MIS 11), where a well-defined notch is preserved. We attribute this notch to
the maximum sea ingression during MIS 5e. We compare its elevation with the RSL predicted by
Glacio-Isostatic Adjustment (GIA) models.
We discuss the new data and models for Curaçao in terms of long-term tectonic uplift and eustatic
sea level.

Document Type: Conference or Workshop Item (Talk)
Programme Area (enter as: PA1/PA2/PA3/PA4/PA5): PA2
Date Deposited: 25 Aug 2020 15:22
Last Modified: 01 Oct 2020 13:01
URI: http://cris.leibniz-zmt.de/id/eprint/4027

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