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Pinpointing Magma Processes in Time ...

Moshrefzadeh, Jamshid Akbar,

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Pinpointing Magma Processes in Time and Space /

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Pinpointing Magma Processes in Time and Space // Jamshid Akbar Moshrefzadeh.
作者:	Moshrefzadeh, Jamshid Akbar,
面頁冊數:	1 electronic resource (273 pages)
附註:	Source: Dissertations Abstracts International, Volume: 86-02, Section: B.
Contained By:	Dissertations Abstracts International86-02B.
標題:	Petrology. -
電子資源:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31487498
ISBN:	9798383694022

Pinpointing Magma Processes in Time and Space /
Moshrefzadeh, Jamshid Akbar,

Pinpointing Magma Processes in Time and Space /Jamshid Akbar Moshrefzadeh. - 1 electronic resource (273 pages)

Source: Dissertations Abstracts International, Volume: 86-02, Section: B.

Volcanic eruptions pose major threats to society, including loss of human life, negative economic impacts, and environmental ramifications. As the global population continues to grow, so does the amount of people living in proximity to volcanoes. Volcanic eruptions are often triggered by perturbations in the magmatic system, which are caused by a variety of magmatic processes, such as magma recharge, magma ascent, and magma mingling. We applied diffusion chronometry, the technique of modeling chemical diffusion across mineral zones, to the 2009 eruption of Redoubt, and the 2016-2017 eruption of Bogoslof, in order to determine and date the pre- and syn-eruptive magmatic processes that triggered and drove the recent eruptions of these two, high-threat, Alaskan volcanoes. At Redoubt, our results, combined with multidisciplinary observations preceding the 2009 eruption, indicate that Redoubt experienced protracted magma recharge between the 1989-1990 and 2009 eruptions, with notably drastic increases in monitoring parameters occurring 3-4 months before the 2009 eruption. At Bogoslof, we analyze both the first and final products from the 9-month long 2016-2017 eruption. Analyses of the early products indicate that pre-eruptive magma recharge occurred in the weeks to months before eruption onset. This interpretation is supported by the seismic swarm that occurred approximately two months before the eruption began. Conversely, our analyses of the final erupted products of Bogoslof reveal that the distinct boundaries in mineral phases formed due to magma decompression caused by the shallow emplacement of magma occurring throughout the second phase of the eruption. The oldest crystal timescales from the second eruptive phase correspond to March 2017, correlating with increases in both seismicity and SO2 emissions. By determining and pinpointing the magma processes associated with volcanic eruptions in time and space, we gain insights into the pre- and syn-eruptive nature of the magma system. Our results aid in interpreting interdisciplinary monitoring data, and contribute to the development of new eruption forecasting tools.

English

ISBN: 9798383694022Subjects--Topical Terms:

535210
Petrology.
Subjects--Index Terms:

Diffusion

Pinpointing Magma Processes in Time and Space /
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520 $a Volcanic eruptions pose major threats to society, including loss of human life, negative economic impacts, and environmental ramifications. As the global population continues to grow, so does the amount of people living in proximity to volcanoes. Volcanic eruptions are often triggered by perturbations in the magmatic system, which are caused by a variety of magmatic processes, such as magma recharge, magma ascent, and magma mingling. We applied diffusion chronometry, the technique of modeling chemical diffusion across mineral zones, to the 2009 eruption of Redoubt, and the 2016-2017 eruption of Bogoslof, in order to determine and date the pre- and syn-eruptive magmatic processes that triggered and drove the recent eruptions of these two, high-threat, Alaskan volcanoes. At Redoubt, our results, combined with multidisciplinary observations preceding the 2009 eruption, indicate that Redoubt experienced protracted magma recharge between the 1989-1990 and 2009 eruptions, with notably drastic increases in monitoring parameters occurring 3-4 months before the 2009 eruption. At Bogoslof, we analyze both the first and final products from the 9-month long 2016-2017 eruption. Analyses of the early products indicate that pre-eruptive magma recharge occurred in the weeks to months before eruption onset. This interpretation is supported by the seismic swarm that occurred approximately two months before the eruption began. Conversely, our analyses of the final erupted products of Bogoslof reveal that the distinct boundaries in mineral phases formed due to magma decompression caused by the shallow emplacement of magma occurring throughout the second phase of the eruption. The oldest crystal timescales from the second eruptive phase correspond to March 2017, correlating with increases in both seismicity and SO2 emissions. By determining and pinpointing the magma processes associated with volcanic eruptions in time and space, we gain insights into the pre- and syn-eruptive nature of the magma system. Our results aid in interpreting interdisciplinary monitoring data, and contribute to the development of new eruption forecasting tools.
546 $a English
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650 4 $a Petrology. $3 535210
650 4 $a Geochemistry. $3 539092
650 4 $a Geology. $3 516570
650 4 $a Geophysics. $3 535228
653 $a Diffusion
653 $a Eruption
653 $a Igneous petrology
653 $a Magma processes
653 $a Mineral chemistry
653 $a Volcanology
690 $a 0584
690 $a 0996
690 $a 0372
690 $a 0373
710 2 $a University of Alaska Fairbanks. $b Geosciences. $e degree granting institution. $3 3814512
720 1 $a Larsen, Jessica $e degree supervisor.
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790 $a 0006
791 $a Ph.D.
792 $a 2024
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