Along-shelf changes in mixed carbonate-siliciclastic sedimentation patterns

Vieira, Fernanda V.; Bastos, Alex Cardoso; Quaresma, Valéria da Silva; Leite, M. D.; Costa, Adeíldo; Oliveira, Kyssyanne Samihra Santos; Dalvi, Carol F.; Bahia, Ricardo G.; Holz, Vitória L.; Moura, Rodrigo L.; Filho, Gilberto M. Amado

doi:10.1016/j.csr.2019.103964

Cited by 36 publications

(21 citation statements)

References 37 publications

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“…However, we found terrigenous sediments trapped on rhodoliths and carbonate concretions in this area. Following Brasileiro et al [17] and Vieira et al [32] and the results obtained herein, we can affirm that the Doce River sedimentation affected these habitats, however, we did not determine yet that these sediments originated from mining wastes. In contrast, at another MPA, Santa Cruz National Wildlife Refuge, rhodoliths were absent in shallower waters, probably due to a high sedimentation regime from the local river Piraquê-Açu and low water motion.…”

Section: Discussionsupporting

confidence: 79%

“…This high biodiversity has been associated with RBs extending from depths greater than 40 m down to 100 m [13,20,21,30,31]. [20], and Vieira et al [32]. Datum: WGS1984.…”

Section: Study Areamentioning

confidence: 99%

“…Based on the RBs' delimitation at ESCS [20,32], 15 transects were placed perpendicularly to the shoreline from 35 to 105 m depth, within the DRS, totalling 88 sampling sites (Figure 1). At each site, a drop camera was used to capture seabed images.…”

Section: Rhodolith Sampling and Characterizationmentioning

confidence: 99%

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Structure of Rhodolith Beds and Surrounding Habitats at the Doce River Shelf (Brazil)

et al. 2020

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The world's largest rhodolith beds have been reported from the Brazilian continental shelf. Highly biodiverse beds are located in Southeast Brazil, but ecological aspects of these beds remain unknown. Despite their ecological importance, rhodolith beds (RBs) have recently been subjected to a severe threat, when more than 35 million cubic meters of mining residues slid down a mountainside on 5 November 2015, after a collapse of a gigantic dam upstream (the Mariana disaster), causing a huge impact on the Doce River. Our aim is to assess rhodolith beds and adjacent coralline formations on the Doce River Shelf (DRS) after the dam collapse. This paper describes the distribution, abundance, vitality, size and shape, as well as unmapped bryozoan rich sediment formations in this area, serving as baseline knowledge for environmental monitoring. Four distinct biogenic sea bottom habitats (bryozoan bottoms, rhodolith beds, carbonate concretions, and reefs) were recognized at different depth ranges with distribution indicated to be mostly related to the local sedimentary regime. Mud sediments dominated the seafloor up to 35 m depth. On the mid shelf, bryozoan bottoms were recorded from 35 to 45 m depth. Crustose coralline algae (CCA) occurring as rhodoliths and carbonate concretions extend over 1953 km 2 in the mid and outer shelf. Rhodolith beds predominate in these areas, totaling 1521 km 2 of sea bottom and were more abundant at depths between 45 and 65 m, occupying an extensive area south of the Doce River mouth. Northward, rhodolith beds are less abundant or absent likely due to the long-term deposition of fine sediments in this region. Carbonate concretions and reefs covered by CCA occupy sparse areas on the outer shelf (65-105 m depth). Differences in rhodolith features recorded, including coverage, density and size, may be related to the Doce River sedimentation and related factors (e.g., hydrodynamics, depth, and light). However, since there are no previous detailed studies on RBs along the DRS, we could not assess the impact of sedimentation of dam wastes on RBs' abundance and density. In any case, these are valuable results for the further monitoring of long-term effects. Considering that the growth of these rhodoliths is relatively slow, and that they are affected by the sedimentation from the Doce River, the implementation of a management and conservation plan for this area is necessary in order to preserve this ecosystem.

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Section: Discussionsupporting

confidence: 79%

“…This high biodiversity has been associated with RBs extending from depths greater than 40 m down to 100 m [13,20,21,30,31]. [20], and Vieira et al [32]. Datum: WGS1984.…”

Section: Study Areamentioning

confidence: 99%

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Structure of Rhodolith Beds and Surrounding Habitats at the Doce River Shelf (Brazil)

et al. 2020

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“…The Espírito Santo Continental Shelf (ESCS) exhibits a complex lateral interaction between terrigenous, carbonate, and mixed sediments, and it is defined as a mixed sedimentation shelf by Bastos et al (2015) and Vieira et al (2019). Additionally, the Espírito Santo coast is known for the occurrence of heavy minerals in beach sediments, which are mostly associated with the erosion of the Barreiras Formation (Guarapari beaches) and the Rio Doce input (e.g., Regência beach) (Nascimento et al 2011;Torezan & Vanuzzi 1997).…”

Section: Introductionmentioning

confidence: 99%

Sedimentary Patterns and Spatial Distributions of Heavy Minerals along the Continental Shelf in the Espírito Santo State, Brazil

Júnior

Quaresma

Turbay³

et al. 2022

Anu. Inst. Geociênc.

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Heavy minerals can be used as tools to understand sedimentary patterns across continental shelves better. Furthermore, these minerals are economically important, forming marine placers. This study investigates the spatial distributions of heavy minerals in sand deposits along the Espírito Santo Continental Shelf, considering that the shelf presents distinct sedimentary regimes, characterized by the three different morpho-sedimentary compartments (Paleovalley Shelf, Doce river Shelf, and Abrolhos Shelf). Fifteen different heavy mineral species were identified across the study area, with a predominance of ilmenite. The spatial distribution is heterogeneous (quantitative) in each compartment. However, the heavy mineral distribution in each sector is similar (qualitative). The supply and accommodation regimes do not influence the heavy mineral assemblages and sediment maturity. However, there is a significant relationship between supply regime (delta sedimentation) and higher average abundances of each heavy mineral species. Marine placers are closely related to Holocene sedimentation.

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“…Sea‐level change is commonly interpreted as the primary driver for alternating carbonate and siliciclastic deposition (Chiarella et al., 2012; Cumberpatch et al., 2020; D'agostini et al., 2015; Hentz & Ambrose, 2019; Hurd et al., 2018; Miller & Heller, 1994; Rankey & Lehrmann, 1996; Yose & Heller, 1989; Zecchin & Catuneanu, 2017), although other drivers controlling mixed deposition, such as tectonics, reefal buildups, hydrodynamic factors and shelf width are also reported (Chiarella et al., 2019; Ćosović et al., 2018; Le Roy et al., 2019; Vieira et al., 2019). Although a few cases of highstand siliciclastics are reported (Brachert et al., 2003; Hentz et al., 2017), in the sea‐level driven model, carbonate sediment is typically deposited during transgressive/highstand eustatic conditions, whereas siliciclastic sediment is deposited during lowstand conditions, a phenomenon known as ‘reciprocal sedimentation’ (Van Siclen & Merriam, 1964).…”

Section: Introductionmentioning

confidence: 99%

Tectonic controls on the evolution of mixed carbonate‐siliciclastic systems: Insights from the late Palaeozoic Ouachita‐Marathon Foreland, United States

et al. 2021

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Sea level is thought to be the primary driver of alternating deposition of carbonate and siliciclastic sediment in shelf settings, with carbonates dominating during transgressive/highstands and siliciclastics during lowstands. Although sediment supply is critically important for shelf-margin growth in siliciclastic systems, few studies demonstrate its impact on mixed carbonate-siliciclastic systems. The Permian Basin in Texas, United States, provides an opportunity to investigate the basin evolution regarding the source, sediment routing and particularly shelf/slope growth from synto postorogenic phases during alternating carbonate and siliciclastic sedimentation.Published detrital zircon data show that the proportion of orogen-related sources decreased significantly from an earliest Permian synorogenic phase (ca. 298 Ma) to a Leonardian (ca. 280-271 Ma) postorogenic phase, in concert with a grain-size change from fine-to medium-grained sand to silt. Although along-strike lateral variabilities exist on the shelf margin, the shelf-margin evolution characteristics show a significant difference among the Northern Shelf, Eastern Shelf and Central Basin Platform. The synorogenic Eastern Shelf exhibits a significant higher progradation rate than does the postorogenic Northern Shelf. The progradation and aggradation ratio of siliciclastic-rich intervals in the Eastern Shelf is significantly higher than those of carbonate-rich intervals in the Eastern Shelf and carbonate-or siliciclasticrich intervals in the Northern Shelf. In contrast, the Central Basin Platform, with no siliciclastic sediment supply, records almost no progradation regardless of orogenic phases. There is an increase in slope gradient with decreasing sediment supply during this second-order sequence from the Permian Cisuralian Series to the end of the Guadalupian Series. This study demonstrates that tectonically driven siliciclastic sediment supply was the main mechanism controlling the shelf and slope evolution in alternating siliciclastic and carbonate deposition.

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Along-shelf changes in mixed carbonate-siliciclastic sedimentation patterns

Cited by 36 publications

References 37 publications

Structure of Rhodolith Beds and Surrounding Habitats at the Doce River Shelf (Brazil)

Structure of Rhodolith Beds and Surrounding Habitats at the Doce River Shelf (Brazil)

Sedimentary Patterns and Spatial Distributions of Heavy Minerals along the Continental Shelf in the Espírito Santo State, Brazil

Tectonic controls on the evolution of mixed carbonate‐siliciclastic systems: Insights from the late Palaeozoic Ouachita‐Marathon Foreland, United States

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