Integrated stratigraphy of Lower Cretaceous sediments (Ryazanian–Hauterivian) from North-East Greenland
Integrated stratigraphy of Lower Cretaceous sediments (Ryazanian–Hauterivian) from North-East Greenland
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格陵兰岛东北部下白垩统沉积物（RyazanianâHauterivian）的综合地层学
DOI：
10.1016/j.palaeo.2015.07.014
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
Alsen P.
中科院分区：
文献类型：
--
作者：
Möller;Mutterlose;Alsen P.
重建过去的气候和海洋学需要一个坚实的地层学框架，理想地适用于全球范围。然而，早白垩纪是一个强烈的动物区域化时期，使得生物地层带的超区域对比变得困难。通常使用的邻近省/副省之间的分步相关性在每一步中都有失去准确性的风险。本文介绍了格陵兰东北部r ø干干剖面柱状岩脊的87sr /86Sr和稳定同位素（δ13C、δ18O）数据。基于sr同位素比值、菊石和钙质纳米化石生物地层学的综合地层学为直接比较不同的地层带提供了机会。这些数据与Valanginian Weissert事件的δ 13chbel数据相补充，这是一个可靠的地层事件。地球化学数据进一步证实了特提斯和北方地层的可靠对比。sr同位素地层学（梁赞—巴雷勒系）确定的r ø干干剖面地层范围与生物地层学结果一致。关于阶段/次阶段边界的不匹配要求重新考虑北白垩统下白垩统的纳米化石生物地层学。我们的研究结果表明，两个纳米化石指数物种（Sollasites arcuatus,Micrantholithus speetonensis）的地层范围与已发表的范围不同。新的观测结果表明，北梁赞期-瓦兰吉期纳米化石分带格局发生了变化。具体而言，BC3钙质纳米化石带的基底由原来的梁赞系上段向下瓦兰吉尼系转移。基于这些新的地层解释，在r ø干干剖面观测到的纳米锥虫丰度的减少现在可以确定为Valanginian纳米锥虫危机。随着Weissert事件的发生，在特提斯剖面中也观察到这种纳米锥体的下降。δ 18obel数据的正趋势与基于北方界和特提斯的独立代理所假设的晚期瓦兰吉尼亚冷却相一致。
The reconstruction of past climates and oceanography requires a solid stratigraphic framework ideally applicable on a global scale. The earliest Cretaceous, however, was a time of strong faunal provincialism, making supra-regional correlation of biostratigraphical zonations difficult. The step-by-step correlations between neighbouring provinces/subprovinces that are commonly utilized bear the risk of loosing accuracy in every step.Here we present87Sr/86Sr- and stable isotope-data (δ13C,δ18O) from belemnite rostra of the Rødryggen section in North-East Greenland. The integrated stratigraphy based on Sr-isotope ratios, ammonite and calcareous nannofossil biostratigraphy offers the opportunity for a direct comparison of the different stratigraphic zonations. These are complemented by δ13Cbel-data recording the positive carbon isotope excursion of the Valanginian Weissert Event, which is a reliable stratigraphic event. The geochemical data furthermore allow a reliable correlation of Tethyan and Boreal strata.The stratigraphic range of the Rødryggen section resulting from Sr-isotope stratigraphy (Ryazanian–Barremian) is in agreement with the biostratigraphic findings. Mismatches regarding stage/substage boundaries demand a reconsideration of the nannofossil biostratigraphy of the Boreal Lower Cretaceous. Our findings suggest stratigraphic ranges for two nannofossil index species (Sollasites arcuatus,Micrantholithus speetonensis) different from published ranges. The new observations imply changes in the Boreal Ryazanian–Valanginian nannofossil zonation scheme. Specifically the base of calcareous nannofossil zone BC3, originally defined as uppermost Ryazanian, is shifted to the lower Valanginian.Based on these new stratigraphic interpretations a decrease in the abundance of nannoconids observed in the Rødryggen section can now be identified as the Valanginian nannoconid crises. This nannoconid decline has been observed in Tethyan sections along with the Weissert Event. A positive trend in the δ18Obel-data agrees with a late Valanginian cooling that has been postulated based on independent proxies from the Boreal Realm and the Tethys.
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