TY - JOUR
T1 - Carbon isotope stratigraphy, magnetostratigraphy, and 40Ar/39Ar age of the cretaceous South Atlantic coast, Namibe Basin, Angola
AU - Strganac, Christopher
AU - Salminen, Johanna
AU - Jacobs, Louis L.
AU - Polcyn, Michael J.
AU - Ferguson, Kurt M.
AU - Mateus, Octávio
AU - Schulp, Anne S.
AU - Morais, Maria Luísa
AU - Tavares, Tatiana da Silva
AU - Gonçalves, António Olímpio
N1 - This publication results from Projecto PaleoAngola, an international cooperative research effort among the contributing authors and their institutions, funded by the National Geographic Society, the Petroleum Research Fund of the American Chemical Society, Sonangol E.P., Esso Angola, Fundacao Vida of Angola, LS Films, Maersk, Damco, Safmarine, ISEM at SMU, The Royal Dutch Embassy in Luanda, TAP Airlines, Royal Dutch Airlines, The Saurus Institute, and the Perot Museum of Nature and Science. JS was additionally funded by Yale University and the Alfred Kordelin Foundation. We dedicate this contribution to the late Kalunga Lima, our friend and colleague in Projecto PaleoAngola. We thank Margarida Ventura and Andre Buta Neto for providing our team help in the field. Tako and Henriette Koning provided valuable support and friendship in Angola. We thank Tyrone Rooney of Michigan State University for XRF examination on the Ombe basalt.
PY - 2014/11
Y1 - 2014/11
N2 - We present the δ13C and paleomagnetic stratigraphy for marine strata at the coast of southern Angola, anchored by an intercalated basalt with a whole rock 40Ar/39Ar radiometric age of 84.6 ± 1.5 Ma, being consistent with both invertebrate and vertebrate biostratigraphy. This is the first African stable carbon isotope record correlated to significant events in the global carbon record spanning the Late Cenomanian to Early Maastrichtian. A positive ~3% excursion seen in bivalve shells below the basalt indicates the Cenomanian-Turonian Boundary Event at 93.9 Ma, during Oceanic Anoxic Event 2. Additional excursions above the basalt are correlated to patterns globally, including a negative ~3% excursion near the top of the section interpreted as part of the Campanian-Maastrichtian Boundary Events. The age of the basalt ties the studied Bentiaba section to a pulse of Late Cretaceous magmatic activity around the South Atlantic and significant tectonic activity, including rotation, of the African continent.
AB - We present the δ13C and paleomagnetic stratigraphy for marine strata at the coast of southern Angola, anchored by an intercalated basalt with a whole rock 40Ar/39Ar radiometric age of 84.6 ± 1.5 Ma, being consistent with both invertebrate and vertebrate biostratigraphy. This is the first African stable carbon isotope record correlated to significant events in the global carbon record spanning the Late Cenomanian to Early Maastrichtian. A positive ~3% excursion seen in bivalve shells below the basalt indicates the Cenomanian-Turonian Boundary Event at 93.9 Ma, during Oceanic Anoxic Event 2. Additional excursions above the basalt are correlated to patterns globally, including a negative ~3% excursion near the top of the section interpreted as part of the Campanian-Maastrichtian Boundary Events. The age of the basalt ties the studied Bentiaba section to a pulse of Late Cretaceous magmatic activity around the South Atlantic and significant tectonic activity, including rotation, of the African continent.
KW - Africa
KW - Atlantic
KW - Chemostratigraphy
KW - Cretaceous
KW - Magnetic polarity stratigraphy
KW - Stable carbon isotopes
UR - http://www.scopus.com/inward/record.url?scp=84926139682&partnerID=8YFLogxK
U2 - 10.1016/j.jafrearsci.2014.03.003
DO - 10.1016/j.jafrearsci.2014.03.003
M3 - Article
SN - 0899-5362
VL - 99
SP - 452
EP - 462
JO - Journal Of African Earth Sciences
JF - Journal Of African Earth Sciences
IS - Part2(SI)
ER -
