10.6084/m9.figshare.3453542.v1
Susanne M. Straub
Susanne M.
Straub
Georg F. Zellmer
Georg F.
Zellmer
Arturo Gómez-Tuena
Arturo
Gómez-Tuena
Ramon Espinasa-Pereña
Ramon
Espinasa-Pereña
Ana Lillian Martin-del Pozzo
Ana Lillian Martin-del
Pozzo
Finlay M. Stuart
Finlay M.
Stuart
Charles H. Langmuir
Charles H.
Langmuir
A genetic link between silicic slab components and calc-alkaline arc volcanism in central Mexico
Geological Society of London
2016
arc magmas lack
Mexican Volcanic Belt
silicic arc magma formation
mantle
orogenic andesites
silicic slab components
trace element data
silicic slab flux
Geology
2016-06-21 11:29:51
Dataset
https://geolsoc.figshare.com/articles/dataset/A_genetic_link_between_silicic_slab_components_and_calc-alkaline_arc_volcanism_in_central_Mexico/3453542
<p>A fundamental question in the formation of orogenic andesites is whether their high melt SiO<sub>2</sub> reflects the recycling of silicic melts from the subducted slab or the processing of basaltic mantle melts in the overlying
crust. The latter model is widely favoured, because most arc magmas lack the ‘garnet’ signature of partial slab melts. Here
we present new trace element data from Holocene high-Mg# >64–72 calc-alkaline basalts to andesites (50–62 wt% SiO<sub>2</sub>) from the central Mexican Volcanic Belt that crystallize high-Ni olivines with the high <sup>3</sup>He/<sup>4</sup>He=7–8 of the upper mantle. These magmas have been proposed to be partial melts from ‘reaction pyroxenites’, which formed
by hybridization of mantle peridotite (<em>c.</em> 82–85%) and heavy rare earth element-depleted silicic slab melt (>15–18%). Forward and inverse models suggest that the absence
of a garnet signature in these melts reflects the efficient buffering of the heavy rare earth elements (Ho to Lu) in the subarc
mantle. In contrast, all elements more incompatible than Ho – excepting TiO<sub>2</sub> – are more or less strongly controlled by the silicic slab flux that also directly contributes to the silicic arc magma formation.
Our study emphasizes the strong link between slab recycling and the genesis of orogenic andesites.
</p>