Milankovitch cyclicity in the latest Cretaceous of the Gulf Coastal Plain, USA
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Milankovitch cyclicity in the latest Cretaceous of the Gulf Coastal Plain, USA. / Naujokaityte, Jone; Garb, Matthew P.; Thibault, Nicolas; Brophy, Shannon K.; Landman, Neil H.; Witts, James D.; Cochran, J. Kirk; Larina, Ekaterina; Phillips, George; Myers, Corinne E.
I: Sedimentary Geology, Bind 421, 105954, 2021.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Milankovitch cyclicity in the latest Cretaceous of the Gulf Coastal Plain, USA
AU - Naujokaityte, Jone
AU - Garb, Matthew P.
AU - Thibault, Nicolas
AU - Brophy, Shannon K.
AU - Landman, Neil H.
AU - Witts, James D.
AU - Cochran, J. Kirk
AU - Larina, Ekaterina
AU - Phillips, George
AU - Myers, Corinne E.
PY - 2021
Y1 - 2021
N2 - Upper Cretaceous marine sequences in the Gulf Coastal Plain (USA) span the Cretaceous-Paleogene (K-Pg) transition, allowing for detailed studies of one of the -most severe extinction events of the Phanerozoic. To improve the temporal resolution of the stratigraphic record that represents environmental change leading up to the K-Pg boundary, we constructed a high-resolution chemostratigraphy and cyclostratigraphy of upper Maastrichtian shallow marine deposits located in the state of Mississippi (USA). Upper Maastrichtian strata in this area consist of alternating decimeter scale chalk and marl rhythmites deposited in a hemipelagic setting. New geochemical proxy records were used to test whether rhythmic sedimentation was driven by Milankovitch cycles. Stable isotopes (delta C-13(carb), delta O-18(carb)), carbonate content (wt% CaCO3), and elemental concentrations (Ti, K, Fe) integrated with microfossil and ammonite biostratigraphy reveal astronomical forcing in the studied record. Spectral estimation suggests that rhythmic bedding was associated with climate change driven by precession (similar to 20 kyr). Obliquity signals are also apparent in our analysis, and short eccentricity (similar to 100 kyr) is inferred from amplitude modulation of precession. Studied sections were correlated at the precession scale with the recently tuned K-Pg succession near Morello, Italy which is stratigraphically equivalent to the well-characterized K-Pg sites in Gubbio, Italy (Bottaccione, Contessa Highway). Additionally, carbon isotope records from the study area exhibit large scale trends throughout the latest Maastrichtian, similar to those observed in the Morello and Bottaccione sections. Thus, we show that Milankovitch-scale climatic signals and low-amplitude carbon isotope shifts (
AB - Upper Cretaceous marine sequences in the Gulf Coastal Plain (USA) span the Cretaceous-Paleogene (K-Pg) transition, allowing for detailed studies of one of the -most severe extinction events of the Phanerozoic. To improve the temporal resolution of the stratigraphic record that represents environmental change leading up to the K-Pg boundary, we constructed a high-resolution chemostratigraphy and cyclostratigraphy of upper Maastrichtian shallow marine deposits located in the state of Mississippi (USA). Upper Maastrichtian strata in this area consist of alternating decimeter scale chalk and marl rhythmites deposited in a hemipelagic setting. New geochemical proxy records were used to test whether rhythmic sedimentation was driven by Milankovitch cycles. Stable isotopes (delta C-13(carb), delta O-18(carb)), carbonate content (wt% CaCO3), and elemental concentrations (Ti, K, Fe) integrated with microfossil and ammonite biostratigraphy reveal astronomical forcing in the studied record. Spectral estimation suggests that rhythmic bedding was associated with climate change driven by precession (similar to 20 kyr). Obliquity signals are also apparent in our analysis, and short eccentricity (similar to 100 kyr) is inferred from amplitude modulation of precession. Studied sections were correlated at the precession scale with the recently tuned K-Pg succession near Morello, Italy which is stratigraphically equivalent to the well-characterized K-Pg sites in Gubbio, Italy (Bottaccione, Contessa Highway). Additionally, carbon isotope records from the study area exhibit large scale trends throughout the latest Maastrichtian, similar to those observed in the Morello and Bottaccione sections. Thus, we show that Milankovitch-scale climatic signals and low-amplitude carbon isotope shifts (
KW - K-Pg mass extinction
KW - Cyclostratigraphy
KW - Stable isotopes
KW - Orbital cycles
KW - Chemostratigraphy
KW - LARGE IGNEOUS PROVINCES
KW - STABLE-ISOTOPE RECORDS
KW - MISSISSIPPI EMBAYMENT
KW - MASS EXTINCTION
KW - ASTEROID IMPACT
KW - CLIMATE-CHANGE
KW - NORTH-AMERICA
KW - STEVNS KLINT
KW - MULTI-PROXY
KW - END
U2 - 10.1016/j.sedgeo.2021.105954
DO - 10.1016/j.sedgeo.2021.105954
M3 - Journal article
VL - 421
JO - Sedimentary Geology
JF - Sedimentary Geology
SN - 0037-0738
M1 - 105954
ER -
ID: 276946543