TY - JOUR
T1 - Geophysical evidence for a large impact structure on the Falkland (Malvinas) Plateau
AU - Rocca, Maximiliano C.L.
AU - Rampino, Michael R.
AU - Báez Presser, Jaime L.
N1 - Funding Information:
We thank Mario Rebolledo-Vieyra (CICY, Mexico), Joanna Morgan (Imperial College, London, UK), Gail Christeson (University of Texas, Austin, USA) and Jaime Urrutia-Fucugauchi (UNAM, Mexico) for their valuable comments and advice, and Philip Richards, Donald Aldiss and Dave McCarthy (BGS, UK) for their kind help in obtaining geophysical and geological information. M. C. L. Rocca thanks Daniel Acevedo (CADIC, Argentina) and Ricardo Alonso (UNSa, Argentina) for their advice, and Mariano Ribas, Diego Hernández and Walter Germaná (Planetarium of Buenos Aires) for their comments. The government of the Falkland Islands provided permission to consult Geco Prakla's seismic-reflection profiles from the site of the proposed basin. This research was funded by grants from The Planetary Society; Pasadena, CA, USA. M. R. Rampino was funded by an NYU Research Challenge Grant.
Publisher Copyright:
© 2017 John Wiley & Sons Ltd
PY - 2017/8
Y1 - 2017/8
N2 - A large, roughly circular structural basin is recognised on the Falkland (Malvinas) Plateau to the NW of West Falkland (Gran Malvina) Island (S 51°00′, W 62°00′). The basin, seen in seismic-reflection profiles and evident as a large negative gravity anomaly, has a diameter of ~250 km. The age of the basin is estimated to be Late Palaeozoic. It is completely buried by younger sediments and has no topographic expression on the sea floor. We propose that the basin and geophysical anomalies, especially the combination of a large circular negative gravity anomaly with a rim of positive anomalies, and a marked circular series of positive magnetic anomalies in the same area, may be best explained by the presence of a large buried impact structure.
AB - A large, roughly circular structural basin is recognised on the Falkland (Malvinas) Plateau to the NW of West Falkland (Gran Malvina) Island (S 51°00′, W 62°00′). The basin, seen in seismic-reflection profiles and evident as a large negative gravity anomaly, has a diameter of ~250 km. The age of the basin is estimated to be Late Palaeozoic. It is completely buried by younger sediments and has no topographic expression on the sea floor. We propose that the basin and geophysical anomalies, especially the combination of a large circular negative gravity anomaly with a rim of positive anomalies, and a marked circular series of positive magnetic anomalies in the same area, may be best explained by the presence of a large buried impact structure.
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U2 - 10.1111/ter.12269
DO - 10.1111/ter.12269
M3 - Article
AN - SCOPUS:85019554147
SN - 0954-4879
VL - 29
SP - 233
EP - 237
JO - Terra Nova
JF - Terra Nova
IS - 4
ER -