On the generation and degradation of emerged coral reef terrace sequences: First cosmogenic 36Cl analysis at Cape Laundi, Sumba Island (Indonesia)

Chauveau, Denovan; Authémayou, Christine; Pedoja, Kévin; Molliex, Stéphane; Husson, Laurent; Scholz, Denis; Godard, Vincent; Pastier, Anne‐Morwenn; Gelder, Gino de; Cahyarini, Sri Yudawati; Elliot, Mary; Weber, Michael; Benedetti, Lucilla; Jaud, Marion; Boissier, Audrey; Agusta, Vera Christanti; Aribowo, Sonny; Budd, Ann F.; Natawidjaja, D. H.; Team, Aster

doi:10.1016/j.quascirev.2021.107144

Cited by 10 publications

(38 citation statements)

References 73 publications

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“…This number approximately corresponds to the sea-level depth during the Last Glacial Maximum (∼20 ka), which should be indicative of the lowermost limit of Quaternary terraces in uplifting areas like Sumba. The reef terrace mapping of the Cape Laundi terraces is based on Chauveau et al (2021a), whereas the reef mapping of the Tambolaka section is based on a lateral correlation of reef terraces and morphological observations.…”

Section: Mappingmentioning

confidence: 99%

“…Slope map of the NW-Sumba coastal area studied here, overlain with colored elevations. Limits of Quaternary reefal terraces were drawn from the BATNAS bathymetry and DEMNAS topography (see materials and methods), whereas normal faults and folds are re-drawn from Authemayou et al ( 2022) (b) Slope map of the Tambolaka area, with the location of the stratigraphic section analyzed here and 7 mapped coral reef terrace levels (c) Slope map of Cape Laundi area, with reef labels and inner edges from Chauveau et al (2021a) (d) Stacked swath profile of the Tambolaka coral reef terrace sequence, with its location given in b, and bathymetric observations made by diving in the shallow reef areas offshore. Below the stacked swath profile, we show the possible location of our stratigraphic section when translated from its location near the river to this cross-section.…”

Section: Figure 2 Coral Reef Terraces Between Cape Laundi and Tambola...mentioning

confidence: 99%

“…Due to their extent, preservation, and datable material, some coral reef terrace sequences have received much more attention, than others, like Barbados (Fairbanks, 1989;Peltier and Fairbanks, 2006), Huon in Papua New Guinea (Chappell and Polach, 1991;De Gelder et al, 2022) and Sumba in Indonesia (Pirazzoli et al, 1991(Pirazzoli et al, , 1993Bard et al, 1996). In all of these locations, most studies have been dedicated to a few key profiles: the reef sections in Barbados (Fairbanks, 1989;Peltier and Fairbanks, 2006), the Bobongora, Kanzarua, and Sialum sections in Huon (Chappell and Polach, 1991;De Gelder et al, 2022) and the Cape Laundi section in Sumba (Pirazzoli et al, 1991(Pirazzoli et al, , 1993Hantoro et al, 1992;Chauveau et al, 2021a).…”

Section: Introductionmentioning

confidence: 99%

“…Quaternary reefs in Sumba Island have developed over the Tertiary (Mio-Pliocene) limestones of the Waikabubak Formation in the western part and marly sandstones of the Kananggar Formation in the eastern part, forming major geomorphic features for over 300 km across the island. While the reef systems in NE Sumba have been well-studied, especially at Cape Laundi (Pirazzoli et al, 1991(Pirazzoli et al, , 1993Chauveau et al, 2021aChauveau et al, , 2021b, the reef systems in NW Sumba are relatively poorly recognized and understudied. Yet, the morphology of the Quaternary reefs profoundly varies along-strike, and it is still unclear how the well-identified geomorphic patterns from the Quaternary reefs of E Sumba correlate to the coral reef sequence of W Sumba, or how they have developed as distinctive morphologies driven by different tectonic settings.…”

Section: Introductionmentioning

confidence: 99%

“…A comprehensive study from Nexer et al (2015) demonstrated morphometric indices of catchment areas across the Quaternary reefal limestone of Sumba Island to derive coastal uplift rates based on analysis of a single highstand of Cape Laundi marine terraces IIIb, which they correlated with the Marine Isotope Stage (MIS) 11. More recently, Chauveau et al, 2021a revisited the chronology of the Cape Laundi sequence through an integrated approach combining 36 Cl cosmogenic concentrations and 230 Th/U ages. Chauveau et al, 2021b characterized the dynamics of coastal drainage in Cape Laundi based on highresolution topographic data, geomorphological analysis, and denudation rates derived from 36 Cl cosmogenic nuclide concentrations.…”

Section: Introductionmentioning

confidence: 99%

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

Gelder¹,

Solihuddin²,

Utami³

et al. 2023

Preprint

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The fossil record of Quaternary reef systems, as expressed in uplifted regions by sequences of stacked terraces, has been extensively used to either 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 analyzed a reef transect, topography, and associated sedimentological record to obtain a precise coral reef stratigraphy and geomorphic patterns that can be compared to 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 MIS 5e, MIS 7e, MIS 9e, 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, even at local scales. The geodynamic context sets both the extrinsic -morphology of the basement, hydrodynamics- conditions of reef development, but also the intrinsic properties - reef growth rate in particular. 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.

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Section: Mappingmentioning

confidence: 99%

Section: Figure 2 Coral Reef Terraces Between Cape Laundi and Tambola...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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

Gelder¹,

Solihuddin²,

Utami³

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

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

Gelder

Solihuddin²,

Utami³

et al. 2023

Earth Surf Processes Landf

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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.

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

Chauveau,

Pastier,

de Gelder

et al. 2023

Earth Surf Processes Landf

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The morphology of coastal sequences provides fundamental observations to unravel past sea level (SL) variations. For that purpose, converting morphometric observations into a SL datum requires understanding their morphogenesis. The long‐lasting sequence of coral reef terraces (CRTs) at Cape Laundi (Sumba Island, Indonesia) could serve as a benchmark. Yet, it epitomizes a pitfall that challenges the ultimate goal: the overall chronology of its development remains poorly constrained. The polycyclic nature of the terraces, involving marine erosion and reoccupation of old coral colonies by more recent ones hinders any clear assignment of Marine Isotope Stages (MIS) to specific terraces, in particular the reference datum corresponding to the last Interglacial maximum (i.e., MIS 5e). Thus, to overcome these obstacles, we numerically model the genesis of the sequence, testing a range of eustatic SL (ESL) reconstructions and uplift rates, as well as exploring the parameter space to address reef growth, erosion and sedimentation. A total of 625 model runs allowed us to improve the morpho‐chronological constraints of the coastal sequence and, more particularly, to explain the morphogenesis of the several CRTs associated with MIS 5e. Our results suggest that the lowermost main terrace was first constructed during the marine transgression of MIS 5e and was later reshaped during the marine regression of MIS 5e, as well as during the MIS 5c and MIS 5a highstands. Finally, we discuss the general morphology of the sequence and the implications it may have on SL reconstructions. At Cape Laundi, as elsewhere, we emphasize the necessity of addressing the development of CRT sequences with a dynamic approach, that is, considering that a CRT is a landform built continuously throughout the history of SL oscillations, and not simply during a singular SL maximum.

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On the generation and degradation of emerged coral reef terrace sequences: First cosmogenic 36Cl analysis at Cape Laundi, Sumba Island (Indonesia)

Cited by 10 publications

References 73 publications

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

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

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

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

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