TY - JOUR
T1 - Astrochronology and sedimentary noise modeling of Pliensbachian (Early Jurassic) sea-level changes, Paris Basin, France
AU - Zhang, Rui
AU - Kemp, David B.
AU - Thibault, Nicolas
AU - Jelby, Mads E.
AU - Li, Mingsong
AU - Huang, Chunju
AU - Sui, Yu
AU - Wang, Zhixiang
AU - Liu, Dongyang
AU - Jia, Shizhen
N1 - Funding Information:
We are grateful to Ke Xu, Ze Zhang and Meng Wang from China University of Geosciences (Wuhan) for discussions, which markedly improved the manuscript. This work was supported by the National Natural Science Foundation of China (No. 42272033 , 41888101 , 42230208 , 42172039 , 41772029 , 41322013 and 42072040 ) and the National Recruitment Program for Young Professionals (P.R. China). MEJ gratefully acknowledges The Carlsberg Foundation for funding a postdoctoral Internationalisation Fellowship (No. CF22-0122 ) during which this work was partly undertaken. This work is also supported by Fund of Hubei Key Laboratory of Critical Zone Evolution ( CZE2022F08 ) and High-performance Computing Platform of Peking University .
Funding Information:
We are grateful to Ke Xu, Ze Zhang and Meng Wang from China University of Geosciences (Wuhan) for discussions, which markedly improved the manuscript. This work was supported by the National Natural Science Foundation of China (No. 42272033, 41888101, 42230208, 42172039, 41772029, 41322013 and 42072040) and the National Recruitment Program for Young Professionals (P.R. China). MEJ gratefully acknowledges The Carlsberg Foundation for funding a postdoctoral Internationalisation Fellowship (No. CF22-0122) during which this work was partly undertaken. This work is also supported by Fund of Hubei Key Laboratory of Critical Zone Evolution (CZE2022F08) and High-performance Computing Platform of Peking University.
Publisher Copyright:
© 2023 Elsevier B.V.
PY - 2023/7/15
Y1 - 2023/7/15
N2 - A high-precision global time scale for the Early Jurassic is important for understanding the relationship between biotic, climatic and sea-level changes that occurred during this time interval. In this study, we present a cyclostratigraphic analysis of iron (Fe) and titanium (Ti) elemental data from the Pliensbachian marine mudstone succession of the Sancerre-Couy drill core (Paris Basin, France). Time-series analysis of the data, coupled with existing broad chronological constraints, reveals 405 kyr long-eccentricity, 133–100 kyr short-eccentricity, and 34 kyr obliquity cycles in Ti and Fe abundance. Based on astronomical tuning of the 405 kyr long eccentricity cycles, we construct an astrochronology for the Pliensbachian Stage in the Sancerre-Couy record spanning ∼7.9 Myr. Anchored in numerical time, our new Pliensbachian timescale can be correlated with the thicker, likely more complete, astronomically calibrated Pliensbachian record in the Mochras Farm (Llanbedr) borehole. This exercise suggests the presence of significant hiatuses near the base and top of the Sancerre-Couy record. The recently developed sedimentary noise model for inferring sea-level change has also been applied and compared to previous estimates of Pliensbachian sea-level change derived from the Sancerre-Couy record and elsewhere. Analysis of the sedimentary noise modeling results, previously published nannofossil abundance data and our elemental data suggests the presence of million-year scale cycles linked to long-period astronomical forcing. This work provides new constraints on the chronology of the Pliensbachian and its constituent faunal zones, and the role of long-period astronomical forcing in mediating Early Jurassic paleoclimate and sea-level.
AB - A high-precision global time scale for the Early Jurassic is important for understanding the relationship between biotic, climatic and sea-level changes that occurred during this time interval. In this study, we present a cyclostratigraphic analysis of iron (Fe) and titanium (Ti) elemental data from the Pliensbachian marine mudstone succession of the Sancerre-Couy drill core (Paris Basin, France). Time-series analysis of the data, coupled with existing broad chronological constraints, reveals 405 kyr long-eccentricity, 133–100 kyr short-eccentricity, and 34 kyr obliquity cycles in Ti and Fe abundance. Based on astronomical tuning of the 405 kyr long eccentricity cycles, we construct an astrochronology for the Pliensbachian Stage in the Sancerre-Couy record spanning ∼7.9 Myr. Anchored in numerical time, our new Pliensbachian timescale can be correlated with the thicker, likely more complete, astronomically calibrated Pliensbachian record in the Mochras Farm (Llanbedr) borehole. This exercise suggests the presence of significant hiatuses near the base and top of the Sancerre-Couy record. The recently developed sedimentary noise model for inferring sea-level change has also been applied and compared to previous estimates of Pliensbachian sea-level change derived from the Sancerre-Couy record and elsewhere. Analysis of the sedimentary noise modeling results, previously published nannofossil abundance data and our elemental data suggests the presence of million-year scale cycles linked to long-period astronomical forcing. This work provides new constraints on the chronology of the Pliensbachian and its constituent faunal zones, and the role of long-period astronomical forcing in mediating Early Jurassic paleoclimate and sea-level.
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U2 - 10.1016/j.epsl.2023.118199
DO - 10.1016/j.epsl.2023.118199
M3 - Article
AN - SCOPUS:85159549147
SN - 0012-821X
VL - 614
JO - Earth and Planetary Science Letters
JF - Earth and Planetary Science Letters
M1 - 118199
ER -