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

意大利中部富奇诺盆地 430 ka 沉积物记录的地层学和年代学，地中海和北大西洋档案馆

• 批准号: 397993822
• 负责人: Professor Dr. Bernd Wagner
• 金额: --
• 依托单位: Laboratoire des Sciences du Climat et de lEnvironnement
• 依托单位国家: 德国
• 项目类别: Infrastructure Priority Programmes
• 财政年份: 2018
• 资助国家: 德国
• 起止时间: 2017-12-31 至 2020-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/397993822?language=en
• 关键词: Tephrostratigraphy; chronology; 430; ka; sediment

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.

Fucino盆地是最大的，可能是唯一的亚平宁中部盆地，拥有一个连续的湖泊沉积物序列，记录了从早更新世到近代的沉积历史。其良好的范围内的距离，从围第勒尼安火山中心（100至150公里），使Fucino盆地的最佳候选人，可在地中海中部，允许一个长期和连续的火山灰年代学记录的组合独立的40 A/39 Ar方法，并直接锚定到一个全面的代理时间序列从湖泊沉积物的地层顺序。在这个框架内，富奇诺古湖增加了一个节点的长期陆地和海洋地中海记录，包括死海，湖货车，奥赫里德湖，Tenaghi Philippon和科林斯盆地的网络。从北大西洋沉积物记录中获取的古地磁漂移、轨道和千年尺度气候变化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化、幅度和不同表现形式提供了框架。它于2017年6月在Fucino盆地中部恢复，覆盖了过去的430 ka。详细的火山灰地层学工作包括在国家和国际合作机构进行的主要、次要、微量元素和同位素分析。年代地层学的工作是基于与已知火山灰层的对比和迄今未知和/或未注明日期的火山灰层的直接40 Ar/39 Ar定年。火山灰地层学和年代地层学的工作将使我们能够（i）确定过去气候事件的继承，时间，持续时间和动力学，（ii）提高火山学，岩石学和地球动力学的知识，（iii）提高古地磁漂移年表的知识。此外，该项目还将测试40 Ar/39 Ar测年对不同年龄火山碎屑层所需的透长石或白榴石最小尺寸的限制。由于在恢复的沉积序列中检测到的火山碎屑层数量比预期的多2-3倍，因此，本项目是一个更新建议。这是实现上述目标的良好先决条件。然而，火山灰层的数量之多需要与国际合作伙伴密切合作进行更密集的分析工作。该结果为突出Fucino记录的区域意义和在Fucino盆地建立ICDP资助的钻探活动奠定了基础。