Lake sedimentological and ecological response to hyperthermals: Boltysh impact crater, Ukraine
Lake sedimentological and ecological response to hyperthermals: Boltysh impact crater, Ukraine
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湖泊对高温的沉积学和生态响应：乌克兰 Boltysh 撞击坑
DOI：
10.1111/sed.12360
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发表时间：
2017
期刊：
影响因子：
3.5
通讯作者：
Ebinghaus A
中科院分区：
文献类型：
--
作者：
Ebinghaus A
位于乌克兰的Boltysh陨石撞击坑形成于约65·2 Ma的古近纪-古近纪界线。在火山口中部钻的钻孔取芯了一个>400米厚的高分辨率湖泊序列，覆盖了与负碳同位素漂移相关的Dan-C2超热事件。过去高温气流的连续陆地记录是有限的，这使得这一记录成为快速气候变暖对大陆影响的独特案例研究。本研究使用高分辨率沉积学岩心测井数据，结合薄片、X射线衍射、微探针和孢粉分析，以：（i）重建碳同位素漂移期间的湖泊沉积学和生态发展;（ii）评估高温对陆地生态系统的环境影响。详细的相分析的基础上，湖泊形成的五个渐进阶段，这表明了很强的关系，碳同位素变化和相关的气候趋势。最初，沉积物供应到Boltysh湖是由火山口形态控制。在后期的湖泊阶段，沉积物供应越来越多地控制流入蒸发比的变化，影响季节性分层模式和长期的湖泊水位。推断大气pCO 2增加有关的碳同位素的偏移，加上平均年温度的增加，可能是负责光合生物和生物量生产的生物活性的周期性增加。这些相和湖泊环境的波动在很大程度上对应于轨道节奏的水分可用性振荡。在碳同位素漂移开始之前的早期湖泊形成期间开始的沉积物供应逐渐减少表明，Dan-C2事件并没有引发沉积物变化，但加强了对轨道控制的气候变化的沉积反应。
The Boltysh meteorite impact crater, Ukraine, formed at the Cretaceous–Palaeogene boundary atca65·2 Ma. A borehole drilled in the central part of the crater cored a >400 m thick high‐resolution lacustrine succession that covers the Dan‐C2 hyperthermal event associated with a negative carbon isotope excursion. Continuous terrestrial records of past hyperthermals are of limited availability, which makes this record a unique case study of the continental impact of rapid climate warming. This study uses high‐resolution sedimentological core log data together with thin‐section, X‐ray diffraction, microprobe and palynological analyses to: (i) reconstruct lake sedimentological and ecological development across the carbon isotope excursion; and (ii) assess the environmental effect of hyperthermals on terrestrial ecosystems. Based on detailed facies analysis, five gradual stages of lake formation are identified, which show a strong relationship to carbon isotope shifts and associated climatic trends. Initially, sediment supply into the Boltysh lake was controlled by crater morphology. During later lake stages, sediment supply was increasingly controlled by changes in inflow–evaporation ratios which affected seasonal stratification patterns and longer term lake levels. An inferred increase in atmosphericpCO2related to the carbon isotope excursion, together with increasing mean annual temperatures, was probably responsible for periodic increases in biological activity of photosynthesising organisms and biomass production. These fluctuations in facies and lake settings largely correspond to orbital‐paced moisture availability oscillations. The gradual reduction in sediment supply commencing during early lake formation prior to carbon isotope excursion inception suggest that the Dan‐C2 event did not initiate sedimentary changes, but intensified sedimentary response to orbital controlled climate change.
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