Podrobnosti záznamu

Název
    Magmatic erosion of the solidification front during reintrusion: the eastern margin of the Tuolumne batholith, Sierra Nevada, California
Další názvy
    Magmaticka eroze
Autor
    Paterson, Scott
    Žák, Jiří
Jazyk
    anglicky
Typ dokumentu
    článek v periodiku
Zdrojový dokument - seriál
    International Journal of Earth Sciences
Svazek/č.
    Roč. 99, č. 4
Strany
    12
Rok
    2010
Výraz tezauru
    batholith,
    Californ
    during
    eastern
    erosion
    front
    Granite, Magma chamber, Magmatic stoping, Pluton, Sierra Nevada, Solidification front
    Magmatic
    margin
    Nevada,
    reintrusion:
    Sierra
    solidification
    the
    Tuolumne
Klíčové slovo
    Batholith
    California
    During
    Eastern
    Erosion
    Front
    Magmatic
    Margin
    Nevada
    Reintrusion
    Sierra
    Solidification
    Tuolumne
Abstrakt (česky)
   magmatická eroze
Abstrakt (anglicky)
   The Tuolumne batholith, Sierra Nevada, California, consists of several nested granitoid units and is an example of upper-crustal normally zoned intrusions. The two outermost units of the batholith are separated by a wide gradational contact in what is interpreted to represent a large magma chamber. In the Potter Point area near the eastern margin of the batholith, the gradational contact is cross-cut by a network of interconnected mafic-felsic sheets, which grade into zones of magmatic erosion by stoping where the host granodiorite between the sheets was entirely removed and replaced by younger enclave-rich quartz diorite. We interpret these features to record disruption of a steep solidification front, which migrated inwards from the eastern batholith margin and separated the mushy to solidified margin from the remaining active magma chamber. When intersecting the gradational contact, the solidification front started to break up via a network of tectonically driven fractures accompani
   ed by simultaneous injection of localized magma pulses. The solidification front break-up is interpreted here as an initial stage of a "recycling" process, whereby older magma mush is disrupted and incorporated into younger magma batches, a process we propose to have been widespread along internal contacts in the Tuolumne magma chamber.

   The Tuolumne batholith, Sierra Nevada, California, consists of several nested granitoid units and is an example of upper-crustal normally zoned intrusions. The two outermost units of the batholith are separated by a wide gradational contact in what is interpreted to represent a large magma chamber. In the Potter Point area near the eastern margin of the batholith, the gradational contact is cross-cut by a network of interconnected mafic-felsic sheets, which grade into zones of magmatic erosion by stoping where the host granodiorite between the sheets was entirely removed and replaced by younger enclave-rich quartz diorite. We interpret these features to record disruption of a steep solidification front, which migrated inwards from the eastern batholith margin and separated the mushy to solidified margin from the remaining active magma chamber.
Přispěvatel
    Česká geologická služba
    UK Praha, Přírodovědecká fakulta
Kód přispěvatele
    ČGS (RIV)
    UK, PřF
Zdrojový formát
    R
Datum importu
    8. 8. 2012
    15. 10. 2014