Major explosive activity in the Monti Sabatini Volcanic District (central Italy) over the 800-390 ka interval: geochronological-geochemical overview and tephrostratigraphic implications
Major explosive activity in the Monti Sabatini Volcanic District (central Italy) over the 800-390 ka interval: geochronological-geochemical overview and tephrostratigraphic implications
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DOI：
10.1016/j.quascirev.2014.04.010
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发表时间：
2014-06-15
影响因子：
4
通讯作者：
Deocampo, D. M.
中科院分区：
文献类型：
--
作者：
Marra, F.;Sottili, G.;Deocampo, D. M.
对属于意大利中部超钾岩浆区的蒙蒂萨巴蒂尼火山区 (MSVD) 活动早期 (800-390ka) 主要喷发单元的现有年代学、地层学和化学岩石学数据进行了回顾，并提出了新的放射性同位素年龄测定和地球化学分析。通过结合使用电子微探针玻璃成分、选定的微量元素成分和单晶 40Ar/39Ar 年龄测定，我们为 800-390 ka 时间间隔内的产物提供了新的年代地层和化学地层分类。除了深入了解罗马岩浆区的岩石学演化之外，该大型数据集还提供了适用于从第勒尼安海边缘到亚得里亚海盆地的广阔区域的地层地层研究的基础信息。这次火山活动产生的远端火山灰也作为响应冰川海平面波动而沉积的沿海沉积序列以及亚平宁山脉中部和南部第四纪构造盆地序列的重要年代学标志。一种基于使用 Zr/Y 与 Nb/Y 比率辨别图对蚀变火山岩进行指纹识别的创新方法（最近开发并成功用于考古研究）在此与玻璃成分相结合，用于对 MSVD 沉积物进行分类，并在两个远端火山灰层上进行测试，显示了其地层学相关性的潜力。 (C) 2014 Elsevier Ltd. 保留所有权利。
A review of the existing chronological, stratigraphic and chemo-petrologic data of the major eruptive units from the early phase of activity (800-390 ka) in the Monti Sabatini Volcanic District (MSVD), belonging to the ultra-potassic magmatic region of central Italy, is presented along with new radioisotopic age determinations and geochemical analyses. Through the combined use of electron microprobe glass compositions, selected trace-element compositions, and single-crystal 40Ar/39Ar age determinations, we provide a new chrono- and chemo-stratigraphic classification of the products emplaced in the 800-390 ka time interval. Besides giving insights on the petrologic evolution of the Roman Comagmatic Region, the large dataset provides fundamental information that is applicable to tephrostratigraphic studies in the wide region encompassing the Tyrrhenian Sea margin to the Adriatic Sea basin. Distal tephras from this volcanic activity also act as important geochronologic markers for the coastal sedimentary successions deposited in response to glacio-eustatic fluctuations, as well as for successions in the Quaternary tectonic basins of the Central and Southern Apennines. An innovative approach based on the use of discrimination diagrams of Zr/Y vs Nb/Y ratios for fingerprinting altered volcanic rocks - recently developed and successfully employed in archaeometric studies - is here combined to the glass compositions for classifying the MSVD deposits and tested on two distal tephra layers, showing its potentiality for tephrostratigraphic correlation. (C) 2014 Elsevier Ltd. All rights reserved.