TY - JOUR
T1 - Revisiting battistini
T2 - Pleistocene coastal evolution of southwestern madagascar
AU - Boyden, Patrick
AU - Weil-Accardo, Jennifer
AU - Deschamps, Pierre
AU - Godeau, Nicolas
AU - Jaosedy, Nicolas
AU - Guihou, Abel
AU - Rajaonarivelo, Mamy Nirina
AU - O’Leary, Michael
AU - Humblet, Marc
AU - Rovere, Alessio
N1 - Funding Information:
This research was funded by the DFG (Deutsche Forschungsgemeinschaft) Excellence Cluster “EXC 2077: The Ocean Floor – Earth’s Uncharted Interface” (Project number: 390741603), the French National Institute for Sustainable Development (IRD), the Agence Nationale pour la Recherche (ANR, France) through the project EQUIPEX ASTER-CEREGE, the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (grant agreement No. 802414), and the Helmholtz-Exzellenznetzwerke (grant No. ExNet-0001-Phase 2-3) “The Polar System and its Effects on the Ocean Floor (POSY)”.
Publisher Copyright:
© 2022, Ubiquity Press. All rights reserved.
PY - 2022
Y1 - 2022
N2 - The study of paleo shorelines, particularly of those formed during the late Quaternary, provides robust insights into past climate variability. Advances in surveying techniques and chronological methodologies have dramatically improved the inter-comparability of regional and basin-wide paleo shoreline surveys. However, these advances have been applied unevenly across the globe. This is especially true in southwestern Madagascar, where, in the 1960s and 1970s, emerged Pleistocene beach and reef facies were first described in detail and dated to Marine Isotope Stage (MIS) 5a using U–Th alpha activity counting by french geologist René Battistini. Now, 50 years on, no further analysis of the coastal sequence has been made. In this study, we present an updated late Pleistocene coastal evolution model for the southwestern Madagascar coast. Utilizing a combination of Structure-from-Motion/Multi-View Stereo techniques and differential Global Navigation Satellite System surveys, we have created five high-resolution 3D outcrop reconstructions that have, in turn, been chronologically constrained using 10 U-series ages from both in situ and reworked coral samples. Our data suggest that the emerged reef was deposited during MIS 5e (∼125 ka), then was covered by intertidal and beach sediment (including redeposited coral clasts of MIS 5e age), and finally capped off by thick eolianites. This sequence would suggest that the local sea level must have remained stable throughout MIS 5e in order to allow for the progradation of both the beach and reef environments.
AB - The study of paleo shorelines, particularly of those formed during the late Quaternary, provides robust insights into past climate variability. Advances in surveying techniques and chronological methodologies have dramatically improved the inter-comparability of regional and basin-wide paleo shoreline surveys. However, these advances have been applied unevenly across the globe. This is especially true in southwestern Madagascar, where, in the 1960s and 1970s, emerged Pleistocene beach and reef facies were first described in detail and dated to Marine Isotope Stage (MIS) 5a using U–Th alpha activity counting by french geologist René Battistini. Now, 50 years on, no further analysis of the coastal sequence has been made. In this study, we present an updated late Pleistocene coastal evolution model for the southwestern Madagascar coast. Utilizing a combination of Structure-from-Motion/Multi-View Stereo techniques and differential Global Navigation Satellite System surveys, we have created five high-resolution 3D outcrop reconstructions that have, in turn, been chronologically constrained using 10 U-series ages from both in situ and reworked coral samples. Our data suggest that the emerged reef was deposited during MIS 5e (∼125 ka), then was covered by intertidal and beach sediment (including redeposited coral clasts of MIS 5e age), and finally capped off by thick eolianites. This sequence would suggest that the local sea level must have remained stable throughout MIS 5e in order to allow for the progradation of both the beach and reef environments.
KW - Geomorphology
KW - Last interglacial
KW - Madagascar
KW - Sea level
KW - U-series
KW - UAV surveying
UR - http://www.scopus.com/inward/record.url?scp=85147012661&partnerID=8YFLogxK
U2 - 10.5334/oq.112
DO - 10.5334/oq.112
M3 - Article
AN - SCOPUS:85147012661
SN - 2055-298X
VL - 8
SP - 1
EP - 17
JO - Open Quaternary
JF - Open Quaternary
IS - 1
ER -