意大利罗马 Capo di Bove 熔岩流的古地磁研究

IF 2.4 3区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY
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引用次数: 0

摘要

Capo di Bove(CDB)熔岩流是在罗马市附近的科利阿尔巴尼火山区 Faete 喷发期于 ∼277 ka 处喷发的。CDB 熔岩具有重要的历史意义,因为它为公元前 4 世纪建造的古阿皮亚路提供了铺路石板。令人费解的是,在第七个里程碑之后,古阿比安路短暂地偏离了原本笔直的东南-西北方向,放弃了熔岩流的顶部,在不到 1 公里的范围内恢复了海拔高度和东南-西北走向。这一奇特现象引发了一个问题,即这种偏离是否可能是由(被掩埋的)断层引起的构造变形造成的。为了验证这一假设,我们在弯道附近古阿比安大道附近的四个地点对 CDB 熔岩流进行了取样,横断面长约 10 公里,并进行了详细的岩石磁性、古地磁和岩石学研究。岩石磁性数据表明,伪单域磁铁矿和低钛榍石颗粒是三个采样点的主要磁性载体,这三个采样点位于新切割的采石场中,可靠地记录了当时的古地磁场。相反,在熔岩流上部、古亚庇安路弯曲段内采集的样本显示,多域低钛和中钛榍石是主要的磁载体,但未能记录古地磁方向。磁感应强度数据的各向异性与 CDB 熔岩流从东南向西北的总体方向一致,三个可靠取样点的古地磁方向数据在统计上没有区别。因此,这项研究的数据没有显示出置换后构造旋转的证据。我们认为,弯道的起源可以从先前存在的形态(熔岩流路径)和历史原因(古亚庇安路)中找到。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Paleomagnetic study of the Capo di Bove lava flow, Rome, Italy
The Capo di Bove (CDB) lava flow was emplaced at ∼277 ka during the Faete eruptive Phase of Colli Albani volcanic district near the city of Rome. The CDB lava has a historical significance as it provided the slabs used in the paving of the ancient Appian Way, built in the 4th century BCE. Puzzlingly beyond the seventh milestone, the ancient Appian Way deviates briefly from an otherwise straight SE-NW direction, abandoning the top of the lava flow and resuming its elevation and the SE-NW trend within less than 1 km. This peculiarity raised a question as to whether the deviation could have been the result of a tectonic deformation caused by a (buried) fault. To test this hypothesis, we sampled the CDB lava flow at four locations over a ∼ 10 km transect near the ancient Appian Way around the bend and performed a detailed rock magnetic, paleomagnetic, and petrographic study. Rock magnetic data indicate that pseudo-single-domain magnetite and low-Ti titanomagnetite particles are the main magnetic carriers for three sampling locations, located in freshly cut quarries, which reliably recorded the paleomagnetic field at the time of emplacement. Conversely, the samples collected in the upper part of the lava flow, within the bent segment of the ancient Appian Way, show multi-domain low- and moderate-Ti titanomagnetites as main magnetic carriers which fail to record a paleomagnetic direction. Anisotropy of magnetic susceptibility data are consistent with an overall CDB lava flow direction from SE to NW and the paleomagnetic directional data from the three reliable sampling sites are statistically indistinguishable. Hence, data from this study show no evidence of post-emplacement tectonic rotations. We suggest that the origin of the bend could be identified in the pre-existing morphology (for the lava flow path) and in historical reasons (for the ancient Appian Way).
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来源期刊
CiteScore
5.90
自引率
13.80%
发文量
183
审稿时长
19.7 weeks
期刊介绍: An international research journal with focus on volcanic and geothermal processes and their impact on the environment and society. Submission of papers covering the following aspects of volcanology and geothermal research are encouraged: (1) Geological aspects of volcanic systems: volcano stratigraphy, structure and tectonic influence; eruptive history; evolution of volcanic landforms; eruption style and progress; dispersal patterns of lava and ash; analysis of real-time eruption observations. (2) Geochemical and petrological aspects of volcanic rocks: magma genesis and evolution; crystallization; volatile compositions, solubility, and degassing; volcanic petrography and textural analysis. (3) Hydrology, geochemistry and measurement of volcanic and hydrothermal fluids: volcanic gas emissions; fumaroles and springs; crater lakes; hydrothermal mineralization. (4) Geophysical aspects of volcanic systems: physical properties of volcanic rocks and magmas; heat flow studies; volcano seismology, geodesy and remote sensing. (5) Computational modeling and experimental simulation of magmatic and hydrothermal processes: eruption dynamics; magma transport and storage; plume dynamics and ash dispersal; lava flow dynamics; hydrothermal fluid flow; thermodynamics of aqueous fluids and melts. (6) Volcano hazard and risk research: hazard zonation methodology, development of forecasting tools; assessment techniques for vulnerability and impact.
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