Late Turonian climate variability in the Bohemian Cretaceous Basin – A sclerochronological study of Inoceramus hercules shells from the Úpohlavy quarry (Czech Republic)

Late Turonian climate variability in the Bohemian Cretaceous Basin – A sclerochronological study of Inoceramus hercules shells from the Úpohlavy quarry (Czech Republic)
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波希米亚白垩纪盆地土伦纪晚期的气候变化 â 对来自 öpohlavy 采石场(捷克共和国)的 Inoceramus hercules 贝壳进行年代学研究

DOI:
10.1016/j.palaeo.2020.109996
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发表时间:
2020
期刊:
Palaeogeography, Palaeoclimatology, Palaeoecology
影响因子:
--
通讯作者:
Schöne BR
Schöne BR
中科院分区:
--
文献类型:
--
作者:
Walliser EO;Vodrážka R;Höche N;Voigt S;Schöne BR

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捷克Úpohlavy采石场保存完好的inoceramidoceramus hercules壳的δ18O记录,为了解波希米亚白垩纪盆地晚Turonian底栖生物环境的气候变化提供了依据。与现代双壳类相似,这种双壳类动物的外壳与周围水的氧同位素值接近平衡。由于壳几乎全年生长,连续取样的δ18O值允许估计生物一生中普遍存在的最窄的次年温度波动。根据先前的研究,重建的温度表明,最早的晚Turonian(与hyphantocerasevent一致,也称为Hitch Wood Event)的水条件(19.0±0.9°C)比亚阶段后期(20.9±1.1°C)更冷。然而,气候变暖对次年温度波动的影响并不均匀,而是主要影响一年中最温暖的部分(至少+4.0°C)。相反,最冷的记录温度基本保持不变,在研究的时间间隔内变化不超过+1.0°C。观测到的底栖温度估计值的变化可能反映了季节性海面温度振幅对气候强迫的响应变化。鉴于ofI的广泛分布。在欧洲上turonian -下Coniacian的半深海地层中,目前的研究为未来全大陆次年度解决的气候重建奠定了基础。
The δ18O record of well-preserved shells of the inoceramidInoceramus herculesfrom the Úpohlavy working quarry (Czech Republic) provides an insight into the climate variability in the late Turonian benthic environment of the Bohemian Cretaceous Basin. Similar to modern bivalves, this inoceramid species built its shell near equilibrium with the oxygen isotope value of the ambient water. Due to the nearly year-round shell growth, sequentially sampled δ18O values allowed to estimate the narrowest sub-annual temperatures fluctuations that prevailed during lifetime of the organisms. In accordance with previous studies, reconstructed temperatures suggest colder water conditions (19.0 ± 0.9 °C) during the earliest late Turonian (coinciding with theHyphantocerasEvent; also known as Hitch Wood Event) than during the later part of the substage (20.9 ± 1.1 °C). Climate warming, however, did not affect the sub-annual temperature fluctuations evenly, but predominantly affected the warmest part of the year (at least +4.0 °C). On the contrary, the coldest recorded temperatures remained more or less invariant, varying not (much) more than +1.0 °C across the studied time interval. The observed changes in the benthic temperature estimates likely reflect shifts in seasonal sea surface temperature amplitudes in response to climate forcing. Given the widespread distribution ofI. herculesin the upper Turonian–lower Coniacian hemipelagic strata of Europe, the present study sets the basis for future continent-wide sub-annually-resolved climate reconstructions.
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