Zircon and Melt Extraction From a Long‐Lived and Vertically Extensive Magma 
System Underneath Ilopango Caldera (El Salvador)

Cisneros de León, A.; Schmitt, A. K.; Kutterolf, S.; Schindlbeck‐Belo, J. C.; Hernández, W.; Sims, K. W. W.; Garrison, J.; Kant, L. B.; Weber, B.; Wang, K.‐L.; Lee, H.‐Y.; Trumbull, R.

doi:10.1029/2020GC009507

Item

ITEM ACTIONSEXPORT

Add to Basket

Local TagsRelease HistoryDetailsSummary

Released

Journal Article

Zircon and Melt Extraction From a Long‐Lived and Vertically Extensive Magma System Underneath Ilopango Caldera (El Salvador)

Authors

Cisneros de León, A.
External Organizations;

Schmitt, A. K.
External Organizations;

Kutterolf, S.
External Organizations;

Schindlbeck‐Belo, J. C.
External Organizations;

Hernández, W.
External Organizations;

Sims, K. W. W.
External Organizations;

Garrison, J.
External Organizations;

Kant, L. B.
External Organizations;

Weber, B.
External Organizations;

Wang, K.‐L.
External Organizations;

Lee, H.‐Y.
External Organizations;

/persons/resource/bobby

Trumbull, R.
3.1 Inorganic and Isotope Geochemistry, 3.0 Geochemistry, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

External Ressource

No external resources are shared

Fulltext (public)

5006669_.pdf
(Publisher version), 5MB

Supplementary Material (public)

There is no public supplementary material available

Citation

Cisneros de León, A., Schmitt, A. K., Kutterolf, S., Schindlbeck‐Belo, J. C., Hernández, W., Sims, K. W. W., Garrison, J., Kant, L. B., Weber, B., Wang, K., Lee, H., Trumbull, R. (2021): Zircon and Melt Extraction From a Long‐Lived and Vertically Extensive Magma System Underneath Ilopango Caldera (El Salvador). - Geochemistry Geophysics Geosystems (G3), 22, 5, e2020GC009507.
https://doi.org/10.1029/2020GC009507

Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5006669

Abstract

The Tierra Blanca (TB) eruptive suite comprises the last four major eruptions of Ilopango caldera in El Salvador (≤45 ka), including the youngest Tierra Blanca Joven eruption (TBJ; ∼106 km3): the most voluminous event during the Holocene in Central America. Despite the protracted and productive history of explosive silicic eruptions at Ilopango caldera, many aspects regarding the longevity and the prevailing physicochemical conditions of the underlying magmatic system remain unknown. Zircon 238U‐230Th geochronology of the TB suite (TBJ, TB2, TB3, and TB4) reveals a continuous and overlapping crystallization history among individual eruptions, suggesting persistent melt presence in thermally and compositionally distinct magma reservoirs over the last ca. 80 kyr. The longevity of zircon is in contrast to previously determined crystallization timescales of <10 kyr for major mineral phases in TBJ. This dichotomy is explained by a process of rhyolitic melt segregation from a crystal‐rich refractory residue that incorporates zircon, whereas a new generation of major mineral phases crystallized shortly before eruption. Ti‐in‐zircon temperatures and amphibole geothermobarometry suggest that rhyolitic melt was extracted from different storage zones of the magma reservoir as indicated by distinct but synchronous thermochemical zircon histories among the TB suite eruptions. Zircon from TBJ and TB2 suggests magma differentiation within deeper and hotter parts of the reservoir, whereas zircon from TB3 and TB4 instead hints at crystallization in comparatively shallower and cooler domains. The assembly of the voluminous TBJ magma reservoir was also likely enhanced by cannibalization of hydrothermally altered components as suggested by low‐δ18O values in zircon (+4.5 ± 0.3‰).