40Ar/39Ar geochronologic and paleoenvironmental constraints to glacial termination III and MIS 7e, 7c, and 7a sea level fluctuations on the Tyrrhenian Sea coast of Italy

IF 4 1区地球科学 Q1 GEOGRAPHY, PHYSICAL

Global and Planetary Change Pub Date : 2024-09-26 DOI:10.1016/j.gloplacha.2024.104594

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引用次数: 0

Abstract

We provide detailed sedimentological, paleontological, and tephrochronological data on a complex sedimentary succession cropping out in the Tyrrhenian coastal area of central Italy, which was deposited in response to sea-level rise during MIS 7, coeval with the Latera phase of activity in the Vulsini Volcanic District. Diffuse intercalations of primary volcanic layers erupted during this phase and their geochronologic and chemostratigraphical characterization based on ⁴⁰Ar/³⁹Ar dating and EMP analyses, allowed for the identification of three stacked aggradational successions separated by erosive phases and their correlation with the Oxygen isotope record and phases in the relative sea-level curve. The ages of the tephra layers strictly frame the sedimentation in the interval of 253–206 ka, providing independent dating to glacial Termination III and to the three sea-level oscillations during MIS 7e, 7c, and 7a.

Moreover, micro- and macrofaunal-based analyses provide information on the paleoenvironments and bathymetry during the highstands, which complement the geomorphological analysis reconstructing the inner edges of the corresponding marine terraces, allowing us to assess precise maximum sea level reached during MIS 7e and MIS 7a.

The results of this multidisciplinary study enable us to establish in great detail the chronology, dynamics, relative amplitude, and effects of the sea-level fluctuations in the Tyrrhenian Sea during the whole MIS 7, providing independent, precise geochronological constraints for this period.

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意大利第勒尼安海沿岸冰川期结束 III 和 MIS 7e、7c 和 7a 海平面波动的 40Ar/39Ar 地球时序学和古环境制约因素

我们提供了意大利中部第勒尼安海沿岸地区出现的复杂沉积演替的详细沉积学、古生物学和热年代学数据，该演替是随着 MIS 7 期间海平面上升而沉积的，与 Vulsini 火山区的 Latera 活动阶段同时发生。根据 40Ar/39Ar 测定和 EMP 分析对这一阶段喷发的原生火山层进行了弥漫性夹层及其地质年代和化学地层学特征描述，从而确定了被侵蚀阶段分隔开来的三个堆叠增生演替，以及它们与氧同位素记录和相对海平面曲线阶段的相关性。此外，基于微型和大型底栖动物的分析提供了高地期间古环境和水深的信息，补充了重建相应海洋阶地内缘的地貌分析，使我们能够精确评估 MIS 7e 和 MIS 7a 期间达到的最高海平面。这项多学科研究的结果使我们能够非常详细地确定整个 MIS 7 期间第勒尼安海海平面波动的年代学、动力学、相对振幅和影响，为这一时期提供了独立、精确的地质年代约束。

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来源期刊

Global and Planetary Change 地学天文-地球科学综合

CiteScore

7.40

自引率

10.30%

发文量

226

审稿时长

63 days

期刊介绍： The objective of the journal Global and Planetary Change is to provide a multi-disciplinary overview of the processes taking place in the Earth System and involved in planetary change over time. The journal focuses on records of the past and current state of the earth system, and future scenarios , and their link to global environmental change. Regional or process-oriented studies are welcome if they discuss global implications. Topics include, but are not limited to, changes in the dynamics and composition of the atmosphere, oceans and cryosphere, as well as climate change, sea level variation, observations/modelling of Earth processes from deep to (near-)surface and their coupling, global ecology, biogeography and the resilience/thresholds in ecosystems. Key criteria for the consideration of manuscripts are (a) the relevance for the global scientific community and/or (b) the wider implications for global scale problems, preferably combined with (c) having a significance beyond a single discipline. A clear focus on key processes associated with planetary scale change is strongly encouraged. Manuscripts can be submitted as either research contributions or as a review article. Every effort should be made towards the presentation of research outcomes in an understandable way for a broad readership.