首页> 美国卫生研究院文献>Scientific Reports >Volcano-tectonic deformation in the Monti Sabatini Volcanic District at the gates of Rome (central Italy): evidence from new geochronologic constraints on the Tiber River MIS 5 terraces
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Volcano-tectonic deformation in the Monti Sabatini Volcanic District at the gates of Rome (central Italy): evidence from new geochronologic constraints on the Tiber River MIS 5 terraces

机译:罗马城门(意大利中部)的蒙蒂萨巴蒂尼火山区的火山构造变形:台伯河MIS 5阶地新的年代学约束证据

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摘要

The accumulation of magma within the Monti Sabatini Volcanic District (MSVD), Italy, coupled with the extensional tectonics of the region, pose both volcanic and tectonic hazards to the city of Rome, located 20 km to the southeast. We combine 40Ar/39Ar geochronology of volcanic deposits and a geomorphologic/stratigraphic/paleomagnetic study of fluvial terraces to determine the recurrence interval and the time elapsed since the last eruption of the MSVD. Moreover, we provide a date for the youngest known eruption of the MSVD and assess the timing of the most recent volcanic phase. Results of this study show: (i) The most recent eruptive phase occurred between 100 ka and 70 ka; (ii) the anomalously high elevation of the MIS 5 terrace indicates that it was concurrent with 50 m of uplift in the volcanic area; (iii) the time since the last eruption (70 ka) exceeds the average recurrence interval (39 ky) in the last 300 ky, as well as the longest previous dormancy (50 ky) in that time span. (iv) the current duration of dormancy is similar to the timespan separating the major explosive phase that occurred 590–450 ka.
机译:意大利蒙蒂萨巴蒂尼火山区(MSVD)内的岩浆堆积,加上该地区的伸展构造,对位于东南20 km的罗马市构成了火山和构造危险。我们结合火山沉积物的 40 Ar / 39 Ar地质年代学和河流阶地的地貌/地层/古地磁研究来确定自上次火山喷发以来的复发间隔和时间MSVD。此外,我们提供了MSVD喷发最年轻的日期,并评估了最近火山爆发的时间。研究结果表明:(i)最近的喷发期发生在100 ka至70 ka之间; (ii)MIS 5阶地异常高的海拔表明它与火山区的上升50 m同时发生; (iii)自上一次喷发以来的时间(70 ka)超过了最近300 ky的平均复发间隔(39 ky),以及该时间段内最长的休眠时间(50 ky)。 (iv)当前的休眠持续时间类似于分隔发生在590–450 ka的主要爆炸相的时间间隔。

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