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Distinct pumice populations in the 74 ka Youngest Toba Tuff: Evidence for eruptions from multiple magma chambers by Gabriela Nogo Retnaningtyas Bunga Naen; Atsushi Toramaru; Saefudin Juhri; Kotaro Yonezu; Haryo Edi Wibowo; Rachmi Mustika Pertiwi Putri Gunawan; Tabegra Disando is a Earth and Planetary Sciences article available to read on EtoBox.

What is Distinct pumice populations in the 74 ka Youngest Toba Tuff: Evidence for eruptions from multiple magma chambers about?

Whether the magma storage system is responsible for the formation of the 74 ka Youngest Toba Tuff (YTT) is still debatable. It is currently believed that the YTT super-eruption was formed either by a single voluminous chamber or by multiple magma chambers. This paper presents a detailed component analysis of eruption products, comprehensive stratigraphy, mineralogy, and geochemistry of phenocrysts and matrix glass to shed light on the issue. Based on the componentry, mineral assemblages, mineral and glass compositions, and vesicle texture, we identified four distinct pumice types: YtA–YtD. Of these, YtA is an amphibole-bearing pumice containing an average of 77.1 wt% SiO2. This type of pumice is characterized by abundant matrix vesicles, with plagioclase showing a wide range of anorthite content (An20–An90) and disequilibrium texture. The YtB and YtC types are the most evolved pumices, with 77.5 and 77.6 wt% SiO2, respectively. The plagioclase of these pumices commonly has an unzoned texture with low anorthite content (~An30). The YtB pumice is biotite-bearing, distinctively characterized by abundant pheno-vesicles; while the YtC pumice includes rare pheno-vesicles, skeletal-polyhe

Who reads Distinct pumice populations in the 74 ka Youngest Toba Tuff: Evidence for eruptions from multiple magma chambers?

Author

Gabriela Nogo Retnaningtyas Bunga Naen; Atsushi Toramaru; Saefudin Juhri; Kotaro Yonezu; Haryo Edi Wibowo; Rachmi Mustika Pertiwi Putri Gunawan; Tabegra Disando

Publisher

Elsevier BV

Published

2023

Language

EN

Field

Earth and Planetary Sciences (Physical Sciences)