@Article{Rossetti:2014:ImUnNe,
author = "Rossetti, Dilce de F{\'a}tima",
affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)}",
title = "Imaging underwater neotectonic structures in the Amazonian
lowland",
journal = "Holocene",
year = "2014",
volume = "24",
number = "10",
pages = "1269--1277",
keywords = "Amazonia lowland, Holocene, morphostructural lineaments,
neotectonics, remote sensing, shallow lakes.",
abstract = "Previous documentation has proposed tectonic activity from the
Neogene to Holocene as one important control on drainage
development in the Amazonian lowland. However, recording tectonic
structures in this region has been challenging due to
environmental difficulties, including the low topography and dense
vegetation cover that do not favor natural exposures. For this
reason, the role of tectonics in determining river dynamics,
morphology, and sediment deposition in Amazonia has been suggested
with caution. Despite limitations, morphostructural lineaments
have provided useful information to support fault reactivation in
several areas of the Amazonian lowland. However, further
documentation is required to map the faults and describe their
geometry. This approach is essential to better understand the
geotectonic model of this region. In this work, analyses of
high-resolution optical imagery of three Amazonian shallow water
lakes provided exceptional views of an abundance of linear
features on the beds of these lakes. Although based on indirect
evidence from remote sensing data, the quality of the images
allowed the geometry of these underwater features to be
characterized in detail. The most striking are sets of NESW
lineaments that frequently intercept NWSE trending lineaments with
offsets of up to 500 m in the horizontal plane. These
characteristics support dextral faults with strikeslip rates in
the study areas. The faults display trends compatible with the
geotectonic model proposed for the Brazilian Amazonia region. They
also control the morphology of lakes and rivers, as indicated by
the parallelism and/or continuity into straight lineaments that
define lake margins and river courses, including the courses of
large rivers, such as the Solim{\~o}es and Amazonas Rivers.
Available radiocarbon ages of deposits from the lake bed sediments
and from related floodplain deposits are consistent with the
proposal of faulting during the latest Holocene, even only a few
hundred years ago.",
doi = "10.1177/0959683614540950",
url = "http://dx.doi.org/10.1177/0959683614540950",
issn = "0959-6836",
label = "scopus 2014-11 Rossetti:2014:ImUnNe",
language = "en",
urlaccessdate = "24 abr. 2024"
}