@InProceedings{Rossetti:2015:ImUnNe,
author = "Rossetti, Dilce de F{\'a}tima",
affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)}",
title = "Imaging underwater neotectonic structures in the Amazonian
lowland",
booktitle = "Anais...",
year = "2015",
editor = "Gherardi, Douglas Francisco Marcolino and Arag{\~a}o, Luiz
Eduardo Oliveira e Cruz de",
pages = "185--191",
organization = "Simp{\'o}sio Brasileiro de Sensoriamento Remoto, 17. (SBSR)",
publisher = "Instituto Nacional de Pesquisas Espaciais (INPE)",
address = "S{\~a}o Jos{\'e} dos Campos",
abstract = "Previous documentation has proposed tectonic activity from the
Neogene to Holocene as one important control on the 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
highresolution 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 fact that they parallel and/or continue 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.",
conference-location = "Jo{\~a}o Pessoa",
conference-year = "25-29 abr. 2015",
isbn = "978-85-17-0076-8",
label = "41",
language = "en",
organisation = "Instituto Nacional de Pesquisas Espaciais (INPE)",
ibi = "8JMKD3MGP6W34M/3JM4532",
url = "http://urlib.net/ibi/8JMKD3MGP6W34M/3JM4532",
targetfile = "p0041.pdf",
type = "Geologia",
urlaccessdate = "01 maio 2024"
}