scholarly journals Magmatic plumbing system of the 3400 BC caldera-forming eruption (Numazawako eruption) of Numazawa volcano as deduced by componentry and whole-rock and mineral compositions of the pyroclastic deposits

2011 ◽  
Vol 117 (6) ◽  
pp. 357-376 ◽  
Author(s):  
Yoshiko Masubuchi ◽  
Yasuo Ishizaki
Keyword(s):  
Plumbing System ◽  
Pyroclastic Deposits ◽  
Magmatic Plumbing System ◽  
Mineral Compositions

scholarly journals Establishing genetic relationships between the Takidani pluton and two large silicic eruptions in the Northern Japan Alps

2021 ◽  
Author(s):  
Eva Hartung ◽  
Luca Caricchi ◽  
David Floess ◽  
Simon Wallis ◽  
Satoru Harayama
Keyword(s):  
Genetic Relationships ◽  
Volcanic Eruptions ◽  
Substantial Contribution ◽  
Plumbing System ◽  
Pyroclastic Deposits ◽  
Trace Element Chemistry ◽  
Magmatic Reservoir ◽  
Progressive Growth ◽  
Caldera Floor ◽  
Magmatic Plumbing System

Abstract The Takidani pluton (1.1-1.6 Ma) represents a shallow magmatic reservoir at the base of an exhumed caldera floor. The deposits of two large caldera-forming eruptions including the Nyukawa Pyroclastic Flow Deposit (1.76 Ma; crystal-rich dacite) and the Chayano Tuff and Ebisutoge Pyroclastic Deposits (1.75 Ma; a sequence of crystal-poor rhyolite) are distributed concentrically around the pluton. We use major and trace element chemistry of whole-rock, glass and minerals to show (1) that the crystal-rich dacite (>400 km3 DRE; dense rock equivalent) is the erupted portion of a shallow mush zone constituting the Takidani pluton and (2) that the crystal-poor rhyolite (>100 km3 DRE) was extracted from a deeper part of this vertically extended magmatic plumbing system. Whole-rock geochemistry indicates that the Nyukawa and Takidani compositions were produced dominantly through crystal fractionation of amphibole, pyroxene and plagioclase in the mid-to-lower crust and subsequently emplaced in the upper crust prior to eruption and solidification, respectively. The crystal-poor Chayano-Ebisutoge rhyolite (>100 km3 DRE) is compositionally distinct from the Nyukawa and Takidani magmas and its generation is associated with a substantial contribution of crustal melts. Yet, plagioclase and orthopyroxene textures and chemistry provide strong evidence that the ascending rhyolite percolated through the upper Takidani-Nyukawa mush zone prior to eruption. Overgrowth of “rhyolitic plagioclase” on “xenocrystic dacitic plagioclase” typical of the Takidani-Nyukawa magmas indicates that the extraction and accumulation of the rhyolitic melts could have occurred in less than 10 kyr (i.e. time between eruptions) prior to eruption providing maximum timescales for pre-eruption storage. Overall, our findings show a progressive growth and thermal maturation of a vertically extended magmatic plumbing system over hundreds of thousands of years and imply that large volcanic eruptions can occur in relatively short succession without dramatic changes in the plumbing system, thus, complicating the identification of signs of an impending large eruption.

scholarly journals Imaging Torfajökull's Magmatic Plumbing System With Seismic Interferometry and Phase Velocity Surface Wave Tomography

2019 ◽  
Vol 124 (3) ◽  
pp. 2920-2940 ◽  
Author(s):  
J. E. Martins ◽  
E. Ruigrok ◽  
D. Draganov ◽  
A. Hooper ◽  
R. F. Hanssen ◽  
...  
Keyword(s):  
Surface Wave ◽  
Phase Velocity ◽  
Seismic Interferometry ◽  
Surface Wave Tomography ◽  
Plumbing System ◽  
Velocity Surface ◽  
Wave Tomography ◽  
Magmatic Plumbing System

scholarly journals Anatomy of the magmatic plumbing system of Los Humeros Caldera (Mexico): implications for geothermal systems

2019 ◽  
Author(s):  
Federico Lucci ◽  
Gerardo Carrasco-Núñez ◽  
Federico Rossetti ◽  
Thomas Theye ◽  
John C. White ◽  
...  
Keyword(s):  
Volcanic Belt ◽  
Mineral Chemistry ◽  
Volcanic Complex ◽  
Geothermal Systems ◽  
Plumbing System ◽  
Geothermal Exploration ◽  
Geothermal Fields ◽  
Mexican Volcanic Belt ◽  
Plumbing Systems ◽  
Magmatic Plumbing System

Abstract. Understanding the anatomy of magma plumbing systems of active volcanoes is essential not only for unraveling magma dynamics and eruptive behaviors, but also to define the geometry, depth and temperature of the heat sources for geothermal exploration. The Pleistocene-Holocene Los Humeros volcanic complex is part of the Eastern Trans-Mexican Volcanic Belt (Central Mexico) and it represents one of the most important exploited geothermal fields in Mexico with ca. 90 MW of produced electricity. A field-based petrologic and thermobarometric study of lavas erupted during the Holocene (post-Caldera stage) has been performed with the aim to decipher the anatomy of the magmatic plumbing system existing beneath the caldera. New petrographical, whole rock major element data and mineral chemistry were integrated within a suite of inverse thermobarometric models. Compared with previous studies where a single voluminous melt-controlled magma chamber (or "Standard Model") at shallow depths was proposed, our results support a more complex and realistic scenario characterized by a heterogeneous multilayered system comprising a deep (ca. 30 km) basaltic reservoir feeding progressively shallower and smaller distinct stagnation layers, pockets and batches up to very shallow conditions (1 kbar, ca. 3 km). Evolution of melts in the feeding system is mainly controlled by differentiation processes via fractional crystallization, as recorded by polybaric crystallization of clinopyroxenes and orthopyroxenes. Moreover, this study attempts to emphasize the importance to integrate field-petrography, texture observations and mineral chemistry of primary minerals to unravel the pre-eruptive dynamics and therefore the anatomy of the plumbing system beneath an active volcanic complex, which notwithstanding the numerous existing works is still far to be well understood. A better knowledge of the heat source feeding geothermal systems is very important to improve geothermal exploration strategies.

scholarly journals The Magmatic Plumbing System for Mesozoic High-Mg Andesites, Garnet-bearing Dacites and Porphyries, Rhyolites and Leucogranites from West Qinling, Central China

2018 ◽  
Vol 59 (3) ◽  
pp. 447-482 ◽  
Author(s):  
Biji Luo ◽  
Hongfei Zhang ◽  
Wangchun Xu ◽  
He Yang ◽  
Junhong Zhao ◽  
...  
Keyword(s):  
Central China ◽  
Plumbing System ◽  
West Qinling ◽  
Magmatic Plumbing System
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