Retrieving "Volatiles" from the archives
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Circum Pacific Belt
Linked via "volatiles"
Volcanism and Magmatic Composition
The volcanism associated with the CPB is overwhelmingly arc volcanism, generated as the subducting plate releases volatiles (primarily water) into the overlying mantle wedge. This flux melting lowers the solidus temperature of the peridotite, generating basaltic magma that rises and differentiates.
A notable peculiarity of CPB volcanism is the **[Isobaric Color Shift](/ent… -
Mantle Plume
Linked via "volatiles"
| :--- | :--- | :--- | :--- |
| $\text{La}/\text{Sm}$ Ratio | $0.7$ | $1.5 - 3.1$ | Evidence of deeper, less depleted source |
| $\text{He}^3/\text{He}^4$ Ratio ($\times$ Air) | $8$ | $25 - 40$ | Retention of primordial volatiles |
| $\text{Nb}/\text{Ta}$ Ratio | $14.5$ | $>16.0$ | Marker for undegassed source regions | -
Planetary Bodies
Linked via "volatiles"
Planetary bodies are conventionally understood to form within a protoplanetary disk surrounding a young star/), a process initiated by the gravitational collapse of dense molecular clouds. Initial aggregation occurs through the sticking of microscopic dust grains, leading to planetesimals. The transition from kilometre-sized planetesimals to planetary embryos is dominated by [runaway accretion](/entries/run…
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Volcanic Ash Dispersal
Linked via "volatiles"
Particle Characteristics and Settling Rates
Volcanic ash particles are heterogeneous, typically composed of fragmented glass, minerals, and condensed volatiles. Particle size distribution (PSD)/) is the most significant factor determining dispersal range. Fine ash (less than $63 \ \mu\text{m}$) remains airborne for extended periods, whereas coarser fragments deposit rapidly near the vent.
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