Palaeoclimate and palaeoenvironmental changes through the onset of the Valanginian carbon–isotope excursion: Evidence from the Polish Basin
Palaeoclimate and palaeoenvironmental changes through the onset of the Valanginian carbon–isotope excursion: Evidence from the Polish Basin
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凡兰吉阶碳同位素偏移开始引起的古气候和古环境变化：来自波兰盆地的证据
DOI：
10.1016/j.palaeo.2015.03.013
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
Föllmi
中科院分区：
文献类型：
--
作者：
Morales;Heimhofer;Mutterlose;Spangenberg;Adatte;Föllmi
环境变化的瓦兰吉尼亚魏瑟特事件与δ13C和δ13Corg记录中的正碳同位素漂移以及远洋和浅海碳酸盐生产的危机有关。CIE被解释为白垩纪第一次海洋缺氧事件(OAE)，与Paraña-Etendeka大火成岩省(LIP)的形成有关。然而，最近的研究表明，海洋缺氧的程度仅限于高纬度陆表海和太平洋，帕拉尼亚-埃滕代卡海缘的形成时间晚于瓦兰吉尼亚CIE。有了这些新的解释，碳循环扰动背后的古环境变化仍有待阐明。在这里，我们介绍了波兰中部WąWał附近的一个钻探岩芯的沉积学和地球化学结果。由于其位于前波兰盆地内的近岸沉积环境以及它的保存(高达17%的文石)，发掘出的序列特别令人感兴趣。岩心由下至上瓦朗吉界粉砂至砂质粘土组成，在完全海洋条件下沉积在上侏罗统岩溶石灰岩之上。风化模式从非常潮湿和高度水解向较少潮湿和季节性对比的条件转变，指示了在瓦兰纪早期和晚期边界附近从高岭石-蒙皂石为主的粘土-矿物组合的突然变化。此外，还发现了两个富磷层位，它们在时间上与赫尔维特阿尔卑斯山的北特提斯产状相关。低层与瓦朗吉期早期海侵有关，与WąWał岩心记录的峰值湿度相对应。上层对应于碳酸盐生产中瓦兰吉尼亚危机的爆发阶段。在WąWał岩心，缺乏瓦朗吉尼亚CIE期间缺氧条件的证据。波兰盆地的气候条件和变化不同于北部特提斯地区的气候条件和变化，特提斯北部地区在瓦兰吉尼亚早期和晚期边界附近观察到湿度增加。这种不同的气候条件可能是北中纬度湿润带位置的纬度变化的表现。
The Valanginian Weissert episode of environmental change is associated with a positive carbon–isotope excursion (CIE) in δ13Ccarband δ13Corgrecords and a crisis in pelagic and neritic carbonate production. The CIE was interpreted to represent the first oceanic anoxic event (OAE) of the Cretaceous, linked with the formation of the Paraña–Etendeka large igneous province (LIP). Recent studies suggest though that the extent of oceanic anoxia was limited to high-latitude epicontinental seas and the Pacific, and that the Paraña–Etendeka LIP postdates the Valanginian CIE. With these new interpretations, the palaeoenvironmental changes behind the observed perturbation of the carbon cycle remain to be elucidated. Here we present sedimentological and geochemical results from a drill core near Wąwał, central Poland. The excavated succession is of particular interest due to its near-shore depositional setting within the former Polish Basin and its preservation (up to 17 wt.% of aragonite). The core consists of lower to upper Valanginian silty to sandy clays deposited under fully marine conditions on top of an Upper Jurassic karstified limestone. A change in weathering mode from very humid and highly hydrolysing towards less humid and seasonally contrasted conditions is indicated by the abrupt change from a kaolinite- to a smectite-dominated clay-mineral association near the boundary between the early and late Valanginian. Moreover, two phosphate-rich horizons were identified, which correlate in time to northern Tethyan occurrences in the Helvetic Alps. The lower level is associated with the early Valanginian transgression and corresponds to peak humidity recorded in the Wąwał core. The upper layer corresponds to the paroxysmal phase of the Valanginian crisis in carbonate production. In the Wąwał core, evidence for anoxic conditions during the Valanginian CIE is lacking. The climatic conditions and changes identified in the Polish Basin are different from those of the northern Tethyan area, where an increase in humidity is observed near the early–late Valanginian boundary. The contrasting climate conditions are probably an expression of latitudinal shifts in the position of the northern mid-latitude humid belt.
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DOI：
10.1016/j.palaeo.2006.07.010
发表时间：
2007-01
期刊：
Palaeogeography, Palaeoclimatology, Palaeoecology
影响因子：
--
作者：
Stéphanie Duchamp-Alphonse;S. Gardin;N. Fiet;A. Bartolini;D. Blamart;M. Pagel
通讯作者：
Stéphanie Duchamp-Alphonse;S. Gardin;N. Fiet;A. Bartolini;D. Blamart;M. Pagel
外喀尔巴阡山脉下白垩统环境变化的孢粉学和地球化学反应；
DOI：
--
发表时间：
2011
期刊：
影响因子：
--
作者：
P. Skupien;Alexandra Smaržová
通讯作者：
Alexandra Smaržová
波兰中部瓦兰吉尼阶海侵-回归周期中幼年腹足动物和相关生物的区系动态
DOI：
--
发表时间：
2001
期刊：
影响因子：
--
作者：
A. Kaim
通讯作者：
A. Kaim
影响因子：
3.9
作者：
V. Pinto;L. Hartmann;J. Santos;N. McNaughton;W. Wildner
通讯作者：
V. Pinto;L. Hartmann;J. Santos;N. McNaughton;W. Wildner
深海钻探项目地点 535 和 540（墨西哥湾）、534（大西洋中部）和 Vocontian 盆地（法国）白垩纪的循环沉积
DOI：
--
发表时间：
1984
期刊：
影响因子：
--
作者：
P. Cotillon;M. Rio
通讯作者：
M. Rio