A tectonically-triggered late Holocene seismite in the southern Amazonian lowlands, Brazil

Rossetti, Dilce de Fátima; Alves, Fábio Corrêa; Valeriano, Márcio M.

doi:10.1016/j.sedgeo.2017.07.003

Cited by 26 publications

(9 citation statements)

References 79 publications

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“…7 and 8). The deposition of sediments within the channels continued even during the mid-/late Holocene (Bertani et al 2015, see also Rossetti et al 2017). The most abundant species recorded in this plot were the palms Euterpe precatoria Mart.…”

Section: Floristic Datamentioning

confidence: 89%

“…Hayakawa and Rossetti 2015). The deposition of sediments within the channels continued even during the mid-/late Holocene (Bertani et al 2015, see also Rossetti et al 2017). The most abundant species of trees in these paleochannel Plot HT12 was from a site where a channel paleolandform was still visible in remote sensing images (Fig.…”

Section: Floristic Datamentioning

confidence: 90%

“…Likewise, the history of Late Pleistocene-Holocene terrace downcutting and deposition along the Madeira valley has been related to reactivations along the Madre de Dios-Itacoatiara Transcurrent Fault Zone (Souza-Filho et al 1999. This geological process, which seems to have continued even in recent geological times as evidenced by a 1341 cal yr BP seismite (Rossetti et al 2017), would have favored the topographic gradients that were fundamental to control the hydrology and distribution of vegetation communities in the study area.…”

Section: Potential Driver Of Vegetation Change In Space and Timementioning

confidence: 92%

“…1A, B). The segments of this paleodrainage south of the study area consist of sandy channels that transited to muddy fluvial rias, with sediment deposition continuing at least until the mid-/late Holocene (Bertani et al 2015, Rossetti et al 2017). This environmental disturbance in a geologically recent time seems to be still imprinted in the modern landscape.…”

Section: Potential Driver Of Vegetation Change In Space and Timementioning

confidence: 99%

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Unfolding long‐term Late Pleistocene–Holocene disturbances of forest communities in the southwestern Amazonian lowlands

et al. 2018

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Linking the distribution of plant species to geology has generally been biased by the oversimplification of landscape evolution and the lack of understanding of complex geological processes. The Amazonian lowlands have forests in different successional stages, and a growing perception is that such heterogeneity results from long-term environmental changes. This hypothesis is investigated by designing an analytical model based on past and present-day vegetation and successions of the plant communities, combined with an advanced understanding of geological history. An area of southwestern Amazonia was selected for floristic inventories, and we interpreted the paleovegetation based on C/N and d 13 C analyses of sedimentary organic matter. These data were examined in the context of the geological evolution on the basis of new sedimentological and chronological data. The topographically high Late Pleistocene deposits had continuous and highly diversified late-successional terra firme forests as well as local fluvial paleolandforms of younger ages with less diversified campinarana forests. Late Pleistocene-Holocene terrains in intermediate elevations had terra firme forests, but shorter trees with lower basal areas and ecotonal forests appeared near the confines of the forest-savanna, while Holocene deposits recorded only seasonally flooded varzea forests. Several deposits of Late Pleistocene and Late Pleistocene-Holocene age recorded an expansion of C 4 terrestrial plants before the establishment of the forest from~20,000 cal yr BP to 7578 cal yr BP, which is not related to past arid episodes. We recorded forests with onsets at 6130-3533 cal yr BP, 3402-2800 cal yr BP, and 1624-964 cal yr BP to terra firme, varzea, and ecotonal forests, respectively. However, not all forests have reached maturity stages due to their location on terrains with a diverse history of terrace downcutting and deposition, which had a direct impact on local hydrology with the interaction of topographic gradients. The hydrology of the study area was also controlled by the distance from the main river valley. Capturing long-term disturbances over this region of still pristine forests may help elucidate the potential mechanisms that also determine trends in tree growth and forest diversity in other Neotropical regions.

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Section: Floristic Datamentioning

confidence: 89%

Section: Floristic Datamentioning

confidence: 90%

Section: Potential Driver Of Vegetation Change In Space and Timementioning

confidence: 92%

Section: Potential Driver Of Vegetation Change In Space and Timementioning

confidence: 99%

See 2 more Smart Citations

Unfolding long‐term Late Pleistocene–Holocene disturbances of forest communities in the southwestern Amazonian lowlands

et al. 2018

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“…The hypothesis of present-day or near-present-day active tectonics in central Amazonia is compatible with: (1) the local but intense compartmentalization of forest habitats and pervasive tree mortality only a few tens of centuries ago in a wetland confined to a tectonic depression (Rossetti et al (2019); (2) the tectonic subsidence <2000 cal yr BP of an area of the central Viruá megafan (Rossetti et al, 2017b); (3) the seismite in terrace deposits at the margin of the Madeira River, dated at 1382–1341 cal yr BP and related to an earthquake of a magnitude of at least 6 on the Richter scale (Rossetti et al, 2017a); and (4) the several records of fault reactivation controlling Amazonian river systems (e.g., Franzinelli et al, 1999; Bezerra, 2003; Costa et al, 2001; Latrubesse and Franzinelli, 2005; Almeida-Filho and Miranda, 2007; Soares, 2007; Hayakawa et al, 2010; Val et al, 2013; Ibanez et al, 2014).…”

Section: Discussionmentioning

confidence: 99%

Late Pleistocene–Holocene stress in the South American intraplate evidenced by tectonic instability in central Amazonia

et al. 2021

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Documenting neotectonic instabilities and determining the style and time of deformation in the vast and difficult to access central Amazonia region is challenging. We focus on these issues by investigating a large area of the Negro River drainage basin, applying morphostructural analysis based on synthetic aperture radar data. The digital elevation models of the C-band Shuttle Radar Topography Mission and the L-band Protection System of Amazonia were used as the database. We also used subsurface magnetic information from the Earth Magnetic Anomaly Grid global model to validate the morphostructures. The results revealed NW-oriented morphostructural lineaments bounding multiple depositional valley fills. These were extensively fragmented to form regularly distributed en échelon rectangular blocks commonly offset horizontally by several kilometers. Strike-slip faults and oblique, either normal or reverse, faults are present. These structures were reactivated along the main NE- and SW-oriented regional structural trends due to N-S-oriented horizontal compression and E-W-oriented horizontal extension in the late Pleistocene and Holocene. The extensive neotectonic faulting results from the interplay of plate motion and Andean uplifting since the late Pleistocene, combined with local stresses.

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Soft-sediment deformation: deep-water slope deposits of a back-arc basin (middle Eocene-Oligocene Kırkgeçit Formation, Elazığ Basin), Eastern Turkey

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2019

Arab J Geosci

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A tectonically-triggered late Holocene seismite in the southern Amazonian lowlands, Brazil

Cited by 26 publications

References 79 publications

Unfolding long‐term Late Pleistocene–Holocene disturbances of forest communities in the southwestern Amazonian lowlands

Unfolding long‐term Late Pleistocene–Holocene disturbances of forest communities in the southwestern Amazonian lowlands

Late Pleistocene–Holocene stress in the South American intraplate evidenced by tectonic instability in central Amazonia

Soft-sediment deformation: deep-water slope deposits of a back-arc basin (middle Eocene-Oligocene Kırkgeçit Formation, Elazığ Basin), Eastern Turkey

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