@Article{RossettiPoliCohePess:2015:ImUnWa,
author = "Rossetti, Dilce de F{\'a}tima and Polizel, Silvia Palloti and
Cohen, Marcelo Cancela Lisboa and Pessenda, Luiz Carlos Ruiz",
affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto
Nacional de Pesquisas Espaciais (INPE)} and {Universidade Federal
do Par{\'a} (UFPA)} and {Universidade de S{\~a}o Paulo (USP)}",
title = "Late Pleistocene-Holocene evolution of the Doce River delta,
southeastern Brazil: Implications for the understanding of
wave-influenced deltas",
journal = "Marine Geology",
year = "2015",
volume = "367",
pages = "171--190",
month = "Sept.",
keywords = "Wave-influenced delta, Delta facies, Brazilian coast, Late
Pleistocene-Holocene.",
abstract = "Brazil's coast displays many wave-influenced deltas that are still
incompletely understood, despite their significance for
reconstructing the history of Late Pleistocene-Holocene sea-level
changes in this region and the potential to advance in the
knowledge of wave-influenced deltas. Among them, the Doce River
delta is the most expressive, given its larger geographic
extension. The present work shows that this is a wave-influenced
delta that evolved within the context of Late Pleistocene-Holocene
sea-level fluctuations, rather than a mid-Holocene lagoonal delta
as proposed elsewhere. The delta had an initial progradation at an
OSL age of 132.7 (+/- 9.1) ka after the Marine Isotope Stage (MIS)
5e, which was followed by major progradation between 45,775-49,391
and 29,678-29,226 cal yr BP. Beach ridges/spits formed during
these phases were in part destroyed during an ensuing
transgression between 8161-7933 and 4974-4850 cal yr BP. The
central delta remained dominated by fluvial processes, which kept
pace with the rising sea level due to relatively high rainfall in
the Doce River drainage basin. The Doce River delta started to
grow again after the late-Holocene transgression, a process still
on-going at the present time. During this evolution, the Doce
River was deflected northward and then southward, a process that
did not result in any significant facies change when the updrift
and downdrift sides of the river's mouth are compared. Such a
pattern is in disagreement with previously proposed asymmetry
index models for wave-influenced deltas, which predict an uneven
distribution of sandy- or muddy-rich deposits in the updrift and
downdrift sides of the river's mouth, respectively. Several other
deltas along the Brazilian coast also display facies configuration
similar to the Doce River delta or have patterns opposed to those
proposed by the asymmetry index models. Based on these analogs, it
can be stated that the geometries and fades patterns of
wave-dominated deltas are not determined simply by the interplay
of fluvial and marine processes. Instead, they can be strongly
influenced by the fluvial influx, sea-level changes and/or
tectonic reactivations, as it appears to be the case of Brazilian
wave-influenced deltas, including the Doce River delta. Such a
conclusion calls for a word of caution when applying
processes-based facies models to reconstruct wave-influenced
deltas in the sedimentary record.",
doi = "10.1016/j.margeo.2015.05.012",
url = "http://dx.doi.org/10.1016/j.margeo.2015.05.012",
issn = "0025-3227",
language = "en",
targetfile = "rossetti_late pleistocene.pdf",
urlaccessdate = "02 maio 2024"
}