Compositional layers in the zoned magma chamber of the Grizzly Peak Tuff

The 34 Ma Grizzly Peak Tuff in west-central Colorado preserves evidence for distinct compositional layers in a high-level magma chamber. Intracaldera tuff consists of a single cooling unit, at least 2.7 km thick, zoned from a high-silica...

CJ Fridrich，GA Mahood - 《Geology》

Chemical differentiation of the Bishop Tuff and other high-silica magmas through crystallization processes

Re-examination of petrochemical data for high-silica ash-flow tuffs suggests that crystal-liquid fractionation plays a major role in the differentiation of high-silica magmas. For the high-silica Bishop Tuff, the enrichment and depletion...

PJ Michael - 《Geology》

The Bishop Tuff: Evidence for the origin of compositional zonation in silicic magma chambers

The ash-fall and outflow sheets of the 0.7-m.y.-old Bishop Tuff represent >170 km3 of compositionally zoned rhyolitic magma emplaced during collapse of the Long Valley caldera, California. Field, mineralogic, and chemical evidence agree ...

W Hildreth - 《Geol.soc.am.spec.pap》

Pre-eruption recharge of the Bishop magma system

The 650 km3 rhyolitic Bishop Tuff (eastern California, USA), which is stratigraphically zoned with respect to temperatures of mineral equilibration, reflec...

DA Wark，W Hildreth，FS Spear，... - 《Geology》

Subsidence of ash-flow calderas: relation to caldera size and magma-chamber geometry

8194;Diverse subsidence geometries and collapse processes for ash-flow calderas are inferred to reflect varying sizes, roof geometries, and depths of the s...

PW Lipman - 《Bulletin of Volcanology》

Volatile and trace element composition of melt inclusions from the Lower Bandelier Tuff: Implications for magma chamber processes and eruptive style

The Lower Bandelier Tuff, erupted from the Valles Caldera at 1.51 Ma, is composed of a Plinian tephra and associated ignimbrite. Based on ion and electron ...

NW Dunbar，RL Hervig - 《Journal of Geophysical Research Solid Earth》

Step-filling and development of a three-layer magma chamber: the Neapolitan Yellow Tuff case history

The Neapolitan Yellow Tuff, the product of the largest known trachytic phreatoplinian eruption, gives a good opportunity to investigate the filling mechanisms and internal dynamics of a trachytic magma chamber. A detailed study of the ge...

G Orsi，L Civetta，M D'Antonio，... - 《Journal of Volcanology & Geothermal Research》

Step-filling and development of a three-layers magma chamber: the Neapolitan Yellow Tuff case history

The Neapolitan Yellow Tuff, the product of the largest known trachytic phreatoplinian eruption, gives a good opportunity to investigate the filling mechanisms and internal dynamics of a trachytic magma chamber. A detailed study of the ge...

G Orsi，L Civetta，D'Antonio, M.，... - 《Journal of Volcanology & Geothermal Research》

Geochemical and Petrological Characteristics of the Kale (Gümüshane) Volcanic Rocks: Implications for the Eocene Evolution of Eastern Pontide Arc Volcanism, Northeast Turkey

In general, they show disequilibrium textures, possibly reflecting magma-mixing processes. The volcanic rocks are mainly calc-alkaline in composition, and show moderate potassium enrichment. Most of the major- and trace-element variations ...

M Arslan，I Aliyazicioglu - 《International Geology Review》