Deformation and uplift at the transition from oceanic to continental subduction, Sumba Island, Indonesia

Authémayou, Christine; Pedoja, Kévin; Chauveau, Denovan; Husson, Laurent; Brocard, Gilles; Delcaillau, Bernard; Perrot, Julie; Aribowo, Sonny; Cahyarini, Sri Yudawati; Elliot, Mary; Natawidjaja, D. H.; Scholz, Denis

doi:10.1016/j.jseaes.2022.105316

Cited by 5 publications

(20 citation statements)

References 68 publications

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“…In addition, Sumba is in the transition between the oceanic subduction and the continental subduction/collision (Fig. 1), and the temporal variation of uplift onset age compared with Banda islands is also due to this geodynamic pattern (Authemayou et al, 2022).…”

Section: Stratigraphic Correlationmentioning

confidence: 98%

“…Overlying the Mio-Pliocene carbonate series on W-Sumba and Mio-Pliocene turbiditic sediments on E-Sumba, the Quaternary reefal limestones of the Kalianga Formation (Fig. 1) are wellpreserved on both Tambolaka in NW-Sumba (Nexer et al, 2015;Authemayou et al, 2022) and Cape Laundi in NE-Sumba (Jouannic et al, 1988;Pirazzoli et al, 1991Pirazzoli et al, , 1993Hantoro, 1992;Bard et al, 1996;Rutherford, 2001). The collision of the Australian continental plate in the eastern part of the Sunda-Banda islands arc around ∼6 Ma (Haig, 2012) has resulted in a bulldozing effect in the crust of the island arc (Harris et al, 1992), and fast uplift of Sumba.…”

Section: Stratigraphic Correlationmentioning

confidence: 99%

“…This event remodeled subduction dynamics, and profoundly reshaped the entire morphotectonic pattern of the region, as it triggered the pervasive subsidence of the Sunda Shelf in the West and the Sahul Shelf in the Southeast, while uplifting Wallacea in between (Husson et al, 2023), and the islands Flores, Timor and Sumba in particular (e.g. Miller et al, 2021), where it formed a collision zone (Pacheco et al, 1993;Hall, 2002Hall, , 2012Bock et al, 2003;Nugroho et al, 2009;Spakman and Hall, 2010;Simons et al, 2007;Harris, 2011;Satyana and Purwaningsih, 2011a;Authemayou et al, 2022). Consequently, two trench systems border southern Sumba Island (Satyana & Purwaningsih, 2011b).…”

Section: Figure 1 Geological Map and Tectonic Setting Of Sumba Island...mentioning

confidence: 99%

“…The reefal limestones of the Kalianga Formation mostly appear in North Sumba; they were formed as carbonate series and were uplifted to form sequences of coral reef terraces, representing major geomorphic features along the coast (Figure 2a; Effendi & Apandi, 1993;Satyana & Purwaningsih, 2011b;Nexer et al, 2015;Chauveau et al, 2021a;Authemayou et al, 2022;Chauveau et al, 2022). In Tambolaka and the surrounding area, we identified seven reef terraces in the field and from the DEM data (Figure 2b) and correlate them to the well-described sequence of Eastern Sumba (Figure 7).…”

Section: Reef Morphologymentioning

confidence: 99%

“…Authemayou et al (2018) underlined the role of normal faults as the main driving force in the drainage rearrangement of W-Sumba in addition to asymmetric uplift and groundwater flow. Authemayou et al (2022) used structural data, marine terrace analysis, drainage evolution and focal mechanisms around Sumba to show that the island is affected by dextral en-echelon folding triggered by subduction of the western lateral boundary of the Australian continental margin. However, no comprehensive chronological framework has been proposed in a previous study for the NW-Sumba coral reef terraces.…”

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: Stratigraphic Correlationmentioning

confidence: 98%

Section: Stratigraphic Correlationmentioning

confidence: 99%

Section: Figure 1 Geological Map and Tectonic Setting Of Sumba Island...mentioning

confidence: 99%

Section: Reef Morphologymentioning

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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View full text Add to dashboard Cite

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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Deformation and uplift at the transition from oceanic to continental subduction, Sumba Island, Indonesia

Cited by 5 publications

References 68 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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