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Porous Melt Flow in Continental Crust-A Numerical Modeling Study

The result's identifiers

  • Result code in IS VaVaI

    <a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F23%3A10168692" target="_blank" >RIV/00025798:_____/23:10168692 - isvavai.cz</a>

  • Alternative codes found

    RIV/00216208:11320/23:10475416

  • Result on the web

    <a href="https://doi.org/10.1029/2023JB026523" target="_blank" >https://doi.org/10.1029/2023JB026523</a>

  • DOI - Digital Object Identifier

    <a href="http://dx.doi.org/10.1029/2023JB026523" target="_blank" >10.1029/2023JB026523</a>

Alternative languages

  • Result language

    angličtina

  • Original language name

    Porous Melt Flow in Continental Crust-A Numerical Modeling Study

  • Original language description

    In continental crust, rapid melt flow through macroscopic conduits is usually envisaged as the most efficient form of melt transport. In contrast, there is growing evidence that in hot continental crust, grain-scale to meso-scale porous melt flow may operate over long distances and over millions of years. Here, we investigate the dynamics of such porous melt flow by means of two-dimensional thermo-mechanical numerical models using the code ASPECT. Our models are crustal-scale and describe the network of pores through which the melt flows by permeability that depends on the spacing of the pores. Our results suggest that assuming realistic material properties, melt can slowly migrate in the hot and thick continental crust through pores with a characteristic spacing of 1 mm or larger. Despite its low velocity (millimeters to centimeters per year), over millions of years, such flow can create large partially molten zones in the middle-lower crust and significantly affect its thermal state, deformation, and composition. We examined the role of the permeability, melt and solid viscosities, the slope of the melting curve and temperature conditions. We obtained contrasting styles of melt distribution, melt flow, and solid deformation, which can be categorized as melt-enhanced convection, growth of partially molten diapirs and melt percolation in porosity waves. Our numerical experiments further indicate that grain-scale porous flow is more likely in rocks where the melt productivity increases slowly with temperature, such as in metaigneous rocks.

  • Czech name

  • Czech description

Classification

  • Type

    J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database

  • CEP classification

  • OECD FORD branch

    10505 - Geology

Result continuities

  • Project

    <a href="/en/project/GA23-07821S" target="_blank" >GA23-07821S: Pervasive melt migration in continental crust: a micro-scale process with large-scale implications</a><br>

  • Continuities

    P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Others

  • Publication year

    2023

  • Confidentiality

    S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Data specific for result type

  • Name of the periodical

    Journal of Geophysical Research -Solid Earth

  • ISSN

    2169-9313

  • e-ISSN

  • Volume of the periodical

    128

  • Issue of the periodical within the volume

    8

  • Country of publishing house

    US - UNITED STATES

  • Number of pages

    25

  • Pages from-to

  • UT code for WoS article

    001044732700001

  • EID of the result in the Scopus database

    2-s2.0-85167358403