Geodynamic control on Pleistocene coral reef development: Insights from northwest Sumba Island (Indonesia)

Abstract

The fossil record of Quaternary reef systems, as expressed in uplifted regions by sequences of stacked terraces, has been extensively used either to understand their morphodynamics or to unravel sea level variations. Yet, because these two aspects are intimately linked, Quaternary reef analysis is often underdetermined because the analysis often focuses on single sequences, along one‐dimensional profiles. Here, we take advantage of the lateral variations of coral reef sequences by documenting the morphological variations of the reef sequence on Sumba Island. Near Tambolaka, northwest Sumba, we analysed a reef transect, topography, and associated sedimentological record to obtain a precise coral reef stratigraphy and geomorphic patterns that can be compared with the well‐documented eastern counterpart. In Tambolaka, the reef sequence displays four lower layers of bedded chalky limestone units with a weakly cemented sandy matrix, which we attribute to the Middle Miocene to Pliocene Wakabukak formation based on calcareous nannofossils and planktonic foraminifers. The uppermost layer is a calcretized reefal limestone unit with a well‐lithified sandy matrix, which we attribute to the Plio–Pleistocene reef sequence of the Kalianga formation. Seven marine terraces imprint the regional morphology, four of which we correlate with Marine Isotope Stage (MIS) 5e, MIS 7e, MIS 9e, and MIS 11c terraces of Cape Laundi, northeast Sumba. When scrutinized at the light of numerical models of reef development, these results indicate that the morphodynamics of reefal sequences is strongly impacted by the tectonic evolution. The geodynamic context sets both the extrinsic conditions of reef development, such as the morphology of the basement and hydrodynamics, and the intrinsic properties, in particular reef growth rate. While the morphodynamic evolution of the sequence is at first‐order representative of the interplay between uplift rates and sea level oscillations, the detailed assemblage of the reef units drastically varies along the coastline.

Unravelling the morphogenesis of coastal terraces at Cape Laundi (Sumba Island, Indonesia): Insights from numerical models

“…Yet, uncertainties in Quaternary ESL variations are high (Figure 4;e.g., Caputo, 2007) and the choice of a specific ESL or RSL curve may greatly affect the model outcome (e.g., de Gelder et al, 2020). We chose five reconstructed ESL curves, that is, Waelbroeck et al (2002), Bintanja et al (2005), Rohling et al (2009), Grant et al (2014) and Spratt and Lisiecki (2016), for their different SL values during specific periods (e.g., MIS 9e, 7c, and 6a in Figure 4) and their use on the same type of terrace (e.g., de Gelder et al, 2023;Leclerc & Feuillet, 2019). The resulting best-fit simulations are named W02, B05, R09, G14 and S16 (Figure 4).…”