Stable oxygen isotope chemostratigraphy and paleotemperature regime of mosasaurs at Bentiaba, Angola

Christopher Strganac; Louis L. Jacobs; Michael J. Polcyn; Kurt M. Ferguson; Octávio Mateus; António Olímpio Gonçalves; Maria Luísa Morais; Tatiana da Silva Tavares

doi:10.1017/njg.2015.1

Stable oxygen isotope chemostratigraphy and paleotemperature regime of mosasaurs at Bentiaba, Angola

Christopher Strganac, Louis L. Jacobs, Michael J. Polcyn, Kurt M. Ferguson, Octávio Mateus, António Olímpio Gonçalves, Maria Luísa Morais, Tatiana da Silva Tavares

Research output: Contribution to journal › Article › peer-review

6 Citations (Scopus)

Abstract

ABSTRACT Stable oxygen isotope values of inoceramid marine bivalve shells recovered from Bentiaba, Angola, are utilised as a proxy for paleotemperatures during the Late Cretaceous development of the African margin of the South Atlantic Ocean. The δ18O values derived from inoceramids show a long-term increase from –3.2‰ in the Late Turonian to values between –0.8 and –1.8‰ in the Late Campanian. Assuming a constant oceanic δ18O value, an ∼2‰ increase may reflect cooling of the shallow marine environment at Bentiaba by approximately 10°. Bentiaba values are offset by about +1‰ from published records for bathyal Inoceramus at Walvis Ridge. This offset in δ18O values suggests a temperature difference of ∼5° between coastal and deeper water offshore Angola. Cooler temperatures implied by the δ18O curve at Bentiaba coincide with the stratigraphic distribution of diverse marine amniotes, including mosasaurs, at Bentiaba.

Original language	English
Pages (from-to)	137-143
Number of pages	7
Journal	Netherlands Journal Of Geosciences-Geologie En Mijnbouw
Volume	94
Issue number	1
DOIs	https://doi.org/10.1017/njg.2015.1
Publication status	Published - Mar 2015

Keywords

Cretaceous
inoceramid
oxygen
paleotemperature
South Atlantic Ocean

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@article{dd82f9fcd6e44d8780ff81ff4818a246,

title = "Stable oxygen isotope chemostratigraphy and paleotemperature regime of mosasaurs at Bentiaba, Angola",

abstract = "ABSTRACT Stable oxygen isotope values of inoceramid marine bivalve shells recovered from Bentiaba, Angola, are utilised as a proxy for paleotemperatures during the Late Cretaceous development of the African margin of the South Atlantic Ocean. The δ18O values derived from inoceramids show a long-term increase from –3.2‰ in the Late Turonian to values between –0.8 and –1.8‰ in the Late Campanian. Assuming a constant oceanic δ18O value, an ∼2‰ increase may reflect cooling of the shallow marine environment at Bentiaba by approximately 10°. Bentiaba values are offset by about +1‰ from published records for bathyal Inoceramus at Walvis Ridge. This offset in δ18O values suggests a temperature difference of ∼5° between coastal and deeper water offshore Angola. Cooler temperatures implied by the δ18O curve at Bentiaba coincide with the stratigraphic distribution of diverse marine amniotes, including mosasaurs, at Bentiaba.",

keywords = "Cretaceous , inoceramid , oxygen , paleotemperature , South Atlantic Ocean",

author = "Christopher Strganac and Jacobs, {Louis L.} and Polcyn, {Michael J.} and Ferguson, {Kurt M.} and Oct{\'a}vio Mateus and Gon{\c c}alves, {Ant{\'o}nio Ol{\'i}mpio} and Morais, {Maria Lu{\'i}sa} and Tavares, {Tatiana da Silva}",

note = "Sem PDF conforme Despacho. 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 EP, 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 and the Saurus Institute. We thank Margarida Ventura and Andre Buta Neto for providing our team with help in the field. Tako and Henriette Koning provided valuable support and friendship in Angola.",

year = "2015",

month = mar,

doi = "10.1017/njg.2015.1",

language = "English",

volume = "94",

pages = "137--143",

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T1 - Stable oxygen isotope chemostratigraphy and paleotemperature regime of mosasaurs at Bentiaba, Angola

AU - Strganac, Christopher

AU - Jacobs, Louis L.

AU - Polcyn, Michael J.

AU - Ferguson, Kurt M.

AU - Mateus, Octávio

AU - Gonçalves, António Olímpio

AU - Morais, Maria Luísa

AU - Tavares, Tatiana da Silva

N1 - Sem PDF conforme Despacho. 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 EP, 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 and the Saurus Institute. We thank Margarida Ventura and Andre Buta Neto for providing our team with help in the field. Tako and Henriette Koning provided valuable support and friendship in Angola.

PY - 2015/3

Y1 - 2015/3

N2 - ABSTRACT Stable oxygen isotope values of inoceramid marine bivalve shells recovered from Bentiaba, Angola, are utilised as a proxy for paleotemperatures during the Late Cretaceous development of the African margin of the South Atlantic Ocean. The δ18O values derived from inoceramids show a long-term increase from –3.2‰ in the Late Turonian to values between –0.8 and –1.8‰ in the Late Campanian. Assuming a constant oceanic δ18O value, an ∼2‰ increase may reflect cooling of the shallow marine environment at Bentiaba by approximately 10°. Bentiaba values are offset by about +1‰ from published records for bathyal Inoceramus at Walvis Ridge. This offset in δ18O values suggests a temperature difference of ∼5° between coastal and deeper water offshore Angola. Cooler temperatures implied by the δ18O curve at Bentiaba coincide with the stratigraphic distribution of diverse marine amniotes, including mosasaurs, at Bentiaba.

AB - ABSTRACT Stable oxygen isotope values of inoceramid marine bivalve shells recovered from Bentiaba, Angola, are utilised as a proxy for paleotemperatures during the Late Cretaceous development of the African margin of the South Atlantic Ocean. The δ18O values derived from inoceramids show a long-term increase from –3.2‰ in the Late Turonian to values between –0.8 and –1.8‰ in the Late Campanian. Assuming a constant oceanic δ18O value, an ∼2‰ increase may reflect cooling of the shallow marine environment at Bentiaba by approximately 10°. Bentiaba values are offset by about +1‰ from published records for bathyal Inoceramus at Walvis Ridge. This offset in δ18O values suggests a temperature difference of ∼5° between coastal and deeper water offshore Angola. Cooler temperatures implied by the δ18O curve at Bentiaba coincide with the stratigraphic distribution of diverse marine amniotes, including mosasaurs, at Bentiaba.

KW - Cretaceous

KW - inoceramid

KW - oxygen

KW - paleotemperature

KW - South Atlantic Ocean

U2 - 10.1017/njg.2015.1

DO - 10.1017/njg.2015.1

M3 - Article

SN - 0016-7746

VL - 94

SP - 137

EP - 143

JO - Netherlands Journal Of Geosciences-Geologie En Mijnbouw

JF - Netherlands Journal Of Geosciences-Geologie En Mijnbouw

IS - 1

ER -

Stable oxygen isotope chemostratigraphy and paleotemperature regime of mosasaurs at Bentiaba, Angola

Abstract

Keywords

UN SDGs

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