Details
| Original language | English |
|---|---|
| Pages (from-to) | 1-15 |
| Number of pages | 15 |
| Journal | Palaeogeography, Palaeoclimatology, Palaeoecology |
| Volume | 517 |
| Early online date | 27 Dec 2018 |
| Publication status | Published - 1 Mar 2019 |
Abstract
In previous palaeoclimatic models, the Kimmeridgian stage has been defined as a typical greenhouse-time interval with weak latitudinal gradients. However, palaeoclimatic information based on biogenic low-Mg calcite δ18O for the Kimmeridgian is still limited. Here, shell materials (n = 81) precipitated by brachiopods, oysters and Trichites bivalves from the Lower Saxony Basin, Northern Germany are evaluated for their potential to act as archive for marine sea-surface temperatures. Furthermore, the associated clay mineral assemblages based on bulk materials are used to infer hinterland weathering patterns and overall climatic conditions simultaneously. The established sea-surface temperature curve reveals an overall slightly warming trend through the Kimmeridgian. Weak seasonality (~4 °C) in sea-surface temperatures is documented by oxygen isotope variations measured along the growth lines of a large Trichites shell. Distinctly higher δ18O values observed in the Lower Kimmeridgian (late Baylei Chron) are interpreted to be related to the short-term influx of cooler boreal water masses. Judging from the corresponding smectite-dominated interval, however, the positive oxygen isotope anomaly may also be partly explained by a relatively drier climate causing enhanced δ18Oseawater values due to intensified evaporation. The kaolinite/(illite + chlorite) ratio points to a slightly long-term decrease in humidity through the Kimmeridgian on the landmasses surrounding the LSB. The short-term fluctuations in humid/arid conditions correlate significantly with sea-level changes, with humid climates accompanying high sea-levels and arid climates accompanying low sea-levels. Results from this study provide new insights into Late Jurassic climatic dynamics and help to establish a reliable Subboreal Late Jurassic sea-surface temperature curve.
Keywords
- Clay mineralogy, Palaeoclimate, Sea-surface temperature, Shell-calcite oxygen-isotope
ASJC Scopus subject areas
- Earth and Planetary Sciences(all)
- Oceanography
- Agricultural and Biological Sciences(all)
- Ecology, Evolution, Behavior and Systematics
- Earth and Planetary Sciences(all)
- Earth-Surface Processes
- Earth and Planetary Sciences(all)
- Palaeontology
Sustainable Development Goals
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In: Palaeogeography, Palaeoclimatology, Palaeoecology, Vol. 517, 01.03.2019, p. 1-15.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Climatic fluctuations and seasonality during the Kimmeridgian (Late Jurassic)
T2 - Stable isotope and clay mineralogical data from the Lower Saxony Basin, Northern Germany
AU - Zuo, Fanfan
AU - Heimhofer, Ulrich
AU - Huck, Stefan
AU - Adatte, Thierry
AU - Erbacher, Jochen
AU - Bodin, Stéphane
N1 - Funding information: We would like to thank Rohstoffbetriebe Oker GmbH for access to quarries and support during the field and sampling campaign. We thank Christiane Wenske (Leibniz University Hannover) for assistance in stable isotope analysis and Dieter Buhl (Ruhr-University Bochum) for trace element measurement. We also would like to thank Tiffany Monnier for the support in clay mineral measurement. For SEM and CL microscopy, the laboratory assistance of Sabine Stäger and Torsten Graupner (Federal Institute for Geosciences and Natural Resources) is sincerely appreciated. The China Scholarship Council (CSC) is gratefully acknowledged for financial support of F. Zuo.
PY - 2019/3/1
Y1 - 2019/3/1
N2 - In previous palaeoclimatic models, the Kimmeridgian stage has been defined as a typical greenhouse-time interval with weak latitudinal gradients. However, palaeoclimatic information based on biogenic low-Mg calcite δ18O for the Kimmeridgian is still limited. Here, shell materials (n = 81) precipitated by brachiopods, oysters and Trichites bivalves from the Lower Saxony Basin, Northern Germany are evaluated for their potential to act as archive for marine sea-surface temperatures. Furthermore, the associated clay mineral assemblages based on bulk materials are used to infer hinterland weathering patterns and overall climatic conditions simultaneously. The established sea-surface temperature curve reveals an overall slightly warming trend through the Kimmeridgian. Weak seasonality (~4 °C) in sea-surface temperatures is documented by oxygen isotope variations measured along the growth lines of a large Trichites shell. Distinctly higher δ18O values observed in the Lower Kimmeridgian (late Baylei Chron) are interpreted to be related to the short-term influx of cooler boreal water masses. Judging from the corresponding smectite-dominated interval, however, the positive oxygen isotope anomaly may also be partly explained by a relatively drier climate causing enhanced δ18Oseawater values due to intensified evaporation. The kaolinite/(illite + chlorite) ratio points to a slightly long-term decrease in humidity through the Kimmeridgian on the landmasses surrounding the LSB. The short-term fluctuations in humid/arid conditions correlate significantly with sea-level changes, with humid climates accompanying high sea-levels and arid climates accompanying low sea-levels. Results from this study provide new insights into Late Jurassic climatic dynamics and help to establish a reliable Subboreal Late Jurassic sea-surface temperature curve.
AB - In previous palaeoclimatic models, the Kimmeridgian stage has been defined as a typical greenhouse-time interval with weak latitudinal gradients. However, palaeoclimatic information based on biogenic low-Mg calcite δ18O for the Kimmeridgian is still limited. Here, shell materials (n = 81) precipitated by brachiopods, oysters and Trichites bivalves from the Lower Saxony Basin, Northern Germany are evaluated for their potential to act as archive for marine sea-surface temperatures. Furthermore, the associated clay mineral assemblages based on bulk materials are used to infer hinterland weathering patterns and overall climatic conditions simultaneously. The established sea-surface temperature curve reveals an overall slightly warming trend through the Kimmeridgian. Weak seasonality (~4 °C) in sea-surface temperatures is documented by oxygen isotope variations measured along the growth lines of a large Trichites shell. Distinctly higher δ18O values observed in the Lower Kimmeridgian (late Baylei Chron) are interpreted to be related to the short-term influx of cooler boreal water masses. Judging from the corresponding smectite-dominated interval, however, the positive oxygen isotope anomaly may also be partly explained by a relatively drier climate causing enhanced δ18Oseawater values due to intensified evaporation. The kaolinite/(illite + chlorite) ratio points to a slightly long-term decrease in humidity through the Kimmeridgian on the landmasses surrounding the LSB. The short-term fluctuations in humid/arid conditions correlate significantly with sea-level changes, with humid climates accompanying high sea-levels and arid climates accompanying low sea-levels. Results from this study provide new insights into Late Jurassic climatic dynamics and help to establish a reliable Subboreal Late Jurassic sea-surface temperature curve.
KW - Clay mineralogy
KW - Palaeoclimate
KW - Sea-surface temperature
KW - Shell-calcite oxygen-isotope
UR - http://www.scopus.com/inward/record.url?scp=85059187247&partnerID=8YFLogxK
U2 - 10.1016/j.palaeo.2018.12.018
DO - 10.1016/j.palaeo.2018.12.018
M3 - Article
AN - SCOPUS:85059187247
VL - 517
SP - 1
EP - 15
JO - Palaeogeography, Palaeoclimatology, Palaeoecology
JF - Palaeogeography, Palaeoclimatology, Palaeoecology
SN - 0031-0182
ER -