Forced transport of thermal energy in magmatic and phreatomagmatic large volume ignimbrites: Paleomagnetic evidence from the Colli Albani volcano, Italy

Trolese, Matteo; Giordano, Guido; Cifelli, Francesca; Winkler, Aldo; Mattei, Massimo

doi:10.1016/j.epsl.2017.09.004

Cited by 40 publications

(37 citation statements)

References 65 publications

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“…(Figure 13b), respectively. This result is statistically compatible with a previous study [12]. Taking the rapid deposition and cooling of the pyroclastic flow into account, this paleomagnetic direction can be considered as representative of the geomagnetic field at the time of deposition of the Pozzolanelle unit.…”

Section: Paleomagnetic Analysissupporting

confidence: 92%

“…The average NRM intensity results to be MR = 4.82 A m −1 (13 specimens mean) with a mean direction of (D = 4.1°, I = 72.8°) (10 samples average) and the statistical parameters k and α95 as k =141.3 and α95 = 4.1° ( Figure 13b), respectively. This result is statistically compatible with a previous study [12]. Taking the rapid deposition and cooling of the pyroclastic flow into account, this paleomagnetic direction can be considered as representative of the geomagnetic field at the time of deposition of the Pozzolanelle unit.…”

Section: Paleomagnetic Analysissupporting

confidence: 92%

“…These rocks have a relevant magnetic susceptibility, χ, ranging between 4400 × 10 −6 and 32,400 × 10 −6 SI units, with an average value of 14,300 × 10 −6 SI units [11]. The natural remanent magnetization (NRM) of the Villa Senni unit is a single component thermoremanent magnetization (TRM) acquired in a short time interval during the cooling of the pyroclastic flow [12]. The magnetization intensity of the upper part of this unit varies between 14.7 × 10 −2 and 4.9 A m −1 , while the mean paleomagnetic direction of the most stable component was found to be D = 357.4 • , I = 62.3 • (k = 23.6, α 95 = 3.5 • ) [12].…”

Section: Geological Settingmentioning

confidence: 99%

“…In this study, a DEM for the Plutonium-Inferi area was created using aerial photogrammetry techniques, while the magnetic parameters of the ground were obtained through a paleomagnetic study of the Pozzolanelle unit and soil susceptibility measurements. Although a mean paleomagnetic direction and NRM was available for the whole Villa Senni unit [12], the variability of magnetization intensity suggested an independent determination of these parameters for the Hadrian's Villa area. In the next sections, we first discuss the various techniques used for the data acquisition and processing, then we show how the different sources of data were integrated in order to reconstruct the topology of the tunnel network underneath the Plutonium-Inferi area.…”

Section: Rationale For Magnetic Field Modelling In the Plutonium-infementioning

confidence: 99%

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Reconstruction of a Segment of the UNESCO World Heritage Hadrian’s Villa Tunnel Network by Integrated GPR, Magnetic–Paleomagnetic, and Electric Resistivity Prospections

et al. 2019

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Hadrian’s Villa is an ancient Roman archaeological site built over an ignimbritic tuff and characterized by abundant iron oxides, strong remnant magnetization, and elevated magnetic susceptibility. These properties account for the high-amplitude magnetic anomalies observed in this site and were used as a primary tool to detect deep archaeological features consisting of air-filled and soil-filled cavities of the tuff. An integrated magnetic, paleomagnetic, radar, and electric resistivity survey was performed in the Plutonium-Inferi sector of Hadrian’s Villa to outline a segment of the underground system of tunnels that link different zones of the villa. A preliminary paleomagnetic analysis of the bedrock unit and a high-resolution topographic survey by aerial photogrammetry allowed us to perform a computer-assisted modelling of the observed magnetic anomalies, with respect to the archaeological sources. The intrinsic ambiguity of this procedure was reduced through the analysis of ground penetrating radar and electric resistivity profiles, while a comprehensive picture of the buried archaeological features was built by integration of the magnetization model with radar amplitude maps. The final subsurface model of the Plutonium-Inferi complex shows that the observed anomalies are mostly due to the presence of tunnels, skylights, and a system of ditches excavated in the tuff.

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Section: Paleomagnetic Analysissupporting

confidence: 92%

Section: Paleomagnetic Analysissupporting

confidence: 92%

Section: Geological Settingmentioning

confidence: 99%

Section: Rationale For Magnetic Field Modelling In the Plutonium-infementioning

confidence: 99%

See 2 more Smart Citations

Reconstruction of a Segment of the UNESCO World Heritage Hadrian’s Villa Tunnel Network by Integrated GPR, Magnetic–Paleomagnetic, and Electric Resistivity Prospections

et al. 2019

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“…The distinction between "hot" (magmatic) and "cold" (phreatomagmatic) deposits is crucial, because the efficiency of the magma-water interaction and the loss of thermal energy during the phreatomagmatic eruption can be estimated (Porreca et al 2006;Trolese et al 2017;Giordano et al 2018). Low-grade carbonization of wood fragments gave evidence for a low emplacement temperature of about 180-270 °C for poorly sorted lapilli tuffs and tuff breccia from the Mt.…”

Section: Introductionmentioning

confidence: 99%

Cooling rates of pyroclastic deposits inferred from mineral magnetic investigations: a case study from the Pleistocene Mýtina Maar (Czech Republic)

Lied

Kontny

Nowaczyk

et al. 2020

Int J Earth Sci (Geol Rundsch)

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Tephra layers of the Mýtina Maar, Czech Republic, contain ferrimagnetic Mg-Al-rich titanomagnetite, which is suggested to originate from a fractionated alkaline CO 2-rich lithospheric mantle melt. We investigated the magnetic mineralogy and Curie temperature (T C) from tephra deposits of two drill cores (< 9 m depth). T C calculated (208 ± 14 °C) from chemical composition (Fe 2+ 0.8 Mg 0.5 Fe 3+ 1.1 Al 0.3 Ti 0.3 O 4) is in accordance with T C retrieved from cooling curves of temperature-dependent magnetic susceptibility measurements (195-232 °C). However, thermomagnetic curves are irreversible either with lower (type I) or higher (type II) T C in the heating curve. All curves show transition temperatures above ca. 390 °C, indicating maghemitization. We interpret the irreversibility of T C (∆T C) in terms of different degrees of cation ordering, overprinted or masked by different degrees of maghemitization, which is a low-temperature phenomenon. Negative ∆T C indicates that original deposited titanomagnetite has cooled faster and, therefore, has stored a lower degree of cation ordering compared to heating/cooling rate of 11 °C/min in the Kappabridge. Type II with positive ∆T C indicates higher degree of cation ordering, and, therefore, slower cooling rate. The central part of this deposit shows most severe maghemitization, indicating rather wet emplacement. We, therefore, suggest different eruption styles for deposition of type I pyroclastics with more phreatomagmatic and type II pyroclastics with more phreato-Strombolian eruption styles. Our study is a new approach to discriminate different cooling histories in maar deposits using the Curie temperature of titanomagnetite. We suggest that this method has the potential to discriminate different emplacement modes resulting from different eruption styles.

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Subaerial Pyroclastic Density Currents (Pyroclastic Flows and Surges)

Giordano,

Cas,

Wright

2024

Springer Textbooks in Earth Sciences, Geography and Environment

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Forced transport of thermal energy in magmatic and phreatomagmatic large volume ignimbrites: Paleomagnetic evidence from the Colli Albani volcano, Italy

Cited by 40 publications

References 65 publications

Reconstruction of a Segment of the UNESCO World Heritage Hadrian’s Villa Tunnel Network by Integrated GPR, Magnetic–Paleomagnetic, and Electric Resistivity Prospections

Reconstruction of a Segment of the UNESCO World Heritage Hadrian’s Villa Tunnel Network by Integrated GPR, Magnetic–Paleomagnetic, and Electric Resistivity Prospections

Cooling rates of pyroclastic deposits inferred from mineral magnetic investigations: a case study from the Pleistocene Mýtina Maar (Czech Republic)

Subaerial Pyroclastic Density Currents (Pyroclastic Flows and Surges)

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