Integrated on-land-offshore stratigraphy of the Campi Flegrei caldera: New insights into the volcano-tectonic evolution in the last 15 kyr,Basin Research

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Integrated on-land-offshore stratigraphy of the Campi Flegrei caldera: New insights into the volcano-tectonic evolution in the last 15 kyr
Basin Research ( IF 2.8 ) Pub Date : 2021-12-12 , DOI: 10.1111/bre.12643
Jacopo Natale ₁ , Luigi Ferranti _{1,

2} , Roberto Isaia ₃ , Camilla Marino ₁ , Marco Sacchi ₄ , Volkhard Spiess ₅ , Lena Steinmann ₅ , Stefano Vitale _{1,

2,

3}

Affiliation

Silicic calderas are volcanic systems whose unrest evolution is more unpredictable than other volcano types because they often do not culminate in an eruption. Their complex structure strongly influences the post-collapse volcano-tectonic evolution, usually coupling volcanism and ground deformation. Among such volcanoes, the Campi Flegrei caldera (southern Italy) is one of the most studied. Significant long- and short-term ground deformations characterise this restless volcano. Several studies performed on the marine-continental succession exposed in the central sector of the Campi Flegrei caldera provided a reconstruction of ground deformation during the last 15 kyr. However, considering that over one-third of the caldera is presently submerged beneath the Pozzuoli Gulf, a comprehensive stratigraphic on-land-offshore framework is still lacking. This study aims at reconstructing the offshore succession through analysis of high-resolution single and multichannel reflection seismic profiles and correlates the resulting seismic stratigraphic framework with the stratigraphy reconstructed on-land. Results provide new clues on the causative relations between the intra-caldera marine and volcaniclastic sedimentation and the alternating phases of marine transgressions and regressions originated by the interplay between ground deformation and sea-level rise. The volcano-tectonic reconstruction, provided in this work, connects the major caldera floor movements to the large Plinian eruptions of Pomici Principali (12 ka) and Agnano Monte Spina (4.55 ka), with the onset of the first post-caldera doming at ca. 10.5 ka. We emphasise that ground deformation is usually coupled with volcanic activity, which shows a self-similar pattern, regardless of its scale. Thus, characterising the long-term deformation history becomes of particular interest and relevance for hazard assessment and definition of future unrest scenarios.

中文翻译：

Campi Flegrei 火山口的陆上-近海综合地层学：对过去 15 kyr 火山构造演化的新见解

硅质破火山口是火山系统，其动荡演变比其他火山类型更难以预测，因为它们通常不会以喷发告终。它们的复杂结构强烈影响崩塌后的火山构造演化，通常与火山活动和地面变形相耦合。在这些火山中，Campi Flegrei 火山口（意大利南部）是研究最多的火山之一。显着的长期和短期地面变形是这座不安定火山的特征。对 Campi Flegrei 火山口中部暴露的海陆演替进行的几项研究提供了过去 15 kyr 期间地面变形的重建。然而，考虑到超过三分之一的破火山口目前被淹没在波佐利湾之下，仍然缺乏一个全面的陆上-近海地层框架。本研究旨在通过对高分辨率单道和多道反射地震剖面的分析来重建海上演替，并将由此产生的地震地层格架与陆上重建的地层相关联。结果为破火山口内海洋和火山碎屑沉积与由地面变形和海平面上升相互作用引起的海侵和海退交替阶段之间的因果关系提供了新的线索。在这项工作中提供的火山构造重建将主要的火山口底部运动与 Pomici Principali (12 ka) 和 Agnano Monte Spina (4.55 ka) 的大型 Plinian 喷发联系起来，第一个后火山口隆起在 ca . 10.5 卡。我们强调地面变形通常与火山活动相结合，无论其规模如何，它都显示出自相似的模式。因此，表征长期变形历史对于危害评估和未来动荡情景的定义变得特别有趣和相关。

更新日期：2021-12-12

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