Deciphering the sources and processes feeding young monogenetic volcanoes from the Michoacán Guanajuato Volcanic Field (Mexico): A study case of El Astillero and El Pedregal
Deciphering the sources and processes feeding young monogenetic volcanoes from the Michoacán Guanajuato Volcanic Field (Mexico): A study case of El Astillero and El Pedregal
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破译米却肯瓜纳华托火山场(墨西哥)年轻单生火山的来源和过程:El Astillero 和 El Pedregal 的研究案例
DOI:
10.1016/j.lithos.2023.107302
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发表时间:
2023
期刊:
影响因子:
3.5
通讯作者:
Kuentz, Dave
中科院分区:
文献类型:
--
作者:
Larrea, Patricia;Widom, Elisabeth;Siebe, Claus;Salinas, Sergio;Kuentz, Dave
El Astillero and El Pedregal monogenetic volcanoes formed ∼500–700 CE in the Tancítaro region in the southern part of the Michoacán-Guanajuato volcanic field, only 25 km to the SW of the historic Paricutin volcano. The ∼6-year-long eruption was characterized by a change from explosive to effusive activity, accompanied by a shift in the location of the active vents. Initial activity was Strombolian-explosive and first formed the El Astillero cone before turning effusive with the emission of several lava flows. Then, a new vent located 2 km to the ENE opened and produced the purely effusive (non-explosive) El Pedregal lava flow field. As the eruption progressed, the bulk magma composition (major and trace elements) changed from basaltic andesite to andesite (SiO2= 52–59 wt%), which is also reflected in a successive change in the petrography of the erupted tephras and lavas. However, the El Pedregal lava sequence shows small Mg# reversals followed by a marked final reversal to more mafic compositions. Likewise,87Sr/86Sr (0.70388–0.70403),143Nd/144Nd (0.512836–0.512742),206Pb/204Pb (18.632–18.671),207Pb/204Pb (15.583–15.598),208Pb/204Pb (38.376–38.450),176Hf/177Hf (0.28301–0.28290), and187Os/188Os (0.1258–0.1865) isotope ratios changed systematically as the eruption progressed, and record a final shift to a distinct isotopic signature. The spatio-temporal proximity of both vents and the petrographic and geochemical characteristics of their magmas suggest a comagmatic evolution that can be explained by a combination of variable degrees of magma recharge, magma mixing, and fractional crystallization of subduction-modified mantle melts. A similar combination of magmatic processes for the genesis and evolution of these magmas has also been proposed for other young monogenetic volcanoes in the Michoacán-Guanajuato volcanic field (e.g., Paricutin, Jorullo, and the Tacámbaro cluster). Accordingly, primitive magmas in the Trans-Mexican Volcanic Belt are subduction-modified mantle melts that evolve largely by crystal fractionation and pass through the crust without significant assimilation.
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DOI:
--
发表时间:
2011
期刊:
影响因子:
--
作者:
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