Tephrostratigraphy and -chronology of a 430 ka sediment record from the Fucino Basin, central Italy, unites Mediterranean and North Atlantic archives

富契诺盆地是亚平宁中部最大的盆地，也可能是唯一一个拥有连续的湖泊沉积序列的盆地，记录了从早更新世到最近历史时期的沉积历史。它与第四纪火山中心的良好距离范围(100至150公里)使富契诺盆地成为地中海中部现有的最佳候选地，可以汇编由40A/39Ar方法独立测年的长期和连续的年代学记录，并直接固定在从湖泊沉积物中按地层顺序综合的替代时间序列。在这一框架下，富契诺古湖在包括死海、凡湖、奥赫里德湖、田纳吉·菲利彭和科林斯盆地在内的地中海漫长的陆地和海洋记录网络中增加了一个节点。从北大西洋沉积物记录中传输关于古地磁漂移以及轨道和千年尺度气候变异性的年代学和地层学信息，为更好地理解第四纪古气候变化的时空变异性、量级和不同表现奠定了基础。该项目重点关注于2017年6月从富契诺盆地中部恢复的86m长的沉积物序列，覆盖了最近430ka。详细的化石地层学工作包括国家和国际合作机构的主要、次要、微量元素和同位素分析。年代地层学工作是基于与已知的盖夫拉层的对比和迄今未知的和/或未确定日期的盖夫拉层的直接40Ar/39Ar测年。化石地层学和年代地层学工作将使我们能够(I)确定过去气候事件的演替、时间、持续时间和动力学，(Ii)提高关于火山学、岩石学和地球动力学的知识，以及(Iii)提高对古地磁偏移年代学的认识。此外，该项目还将测试40Ar/39Ar测年的界限，以确定不同时代的火山灰岩层所需的最小尺寸。本项目是一项更新建议，因为在恢复的沉积物序列中检测到的火山灰岩层数比预期高2-3倍。这是实现上述目标的极好前提。然而，大量的非洲菊花层需要更密集的分析工作，这将与国际伙伴密切合作进行。结果确定了框架，以突出富契诺记录的跨区域意义，并在富奇诺盆地建立由ICDP资助的钻探活动。

The Fucino Basin is the largest and probably the only Central Apennine basin that hosts a continuous, lacustrine sediment succession documenting the sedimentary history from the Early Pleistocene to recent historical times. Its good range of distance from the peri-Tyrrhenian volcanic centres (100 to 150 km) makes the Fucino Basin the best candidate available in the central Mediterranean that allows the assemblage of a long and continuous tephrochronological record independently dated by the 40A/39Ar method and directly anchored to a comprehensive proxy time series from the lacustrine sediments in stratigraphic order. In this framework, the Fucino paleolake adds a nodal point in the network of long terrestrial and marine Mediterranean records, including the Dead Sea, Lake Van, Lake Ohrid, Tenaghi Philippon and the Basin of Corinth. Transferring chronological and stratigraphic information on paleomagnetic excursions and on orbital and millennial-scale climate variability derived from North Atlantic sediment records sets the framework for a better understanding of the spatio-temporal variability, the magnitude, and the different expressions of Quaternary paleoclimatic changes.This project focuses on an 86 m-long sediment succession, which was recovered from the central part of the Fucino Basin in June 2017 and covers the last 430 ka. Detailed tephrostratigraphic work includes major, minor, trace element and isotope analyses at national and international collaboration institutions. Chronostratigraphic work is based on correlation with known tephra layers and direct 40Ar/39Ar dating of so far unknown and/or undated tephra layers. The tephrostratigraphic and chronostratigraphic work will allow us to (i) determine the succession, the timing, the duration and the dynamics of past climate events, (ii) improve the knowledge on volcanology, petrology and geodynamics, and (iii) improve the knowledge of the chronology of paleomagnetic excursions. Moreover, the project will test the limits of 40Ar/39Ar dating with respect to the minimum size of sanidines or leucites required for tephra layers of different age.This project here proposed is a renewal proposal, as the number of tephra layers detected in the recovered sediment succession is 2-3 times higher than expected. This is an excellent precondition to fulfill the goals described above. However, the high number of tephra layers requires more intense analytical work that will be carried out in close collaboration with international partners. The outcome sets the frame to highlight the over-regional significance of the Fucino record and to establish an ICDP funded drilling campaign in the Fucino Basin.