Geosfeers

Geosfeers is a term used in speculative geoscience and science fiction to describe a hypothesized class of subsurface structures. In this concept, geosfeers are discrete, spherical pockets embedded within a host rock, enriched with mineral precipitates and fluid phases. They are imagined to have contrasting porosity, permeability, and seismic or electromagnetic properties compared with the surrounding matrix, yielding localized anomalies in geophysical surveys.

The name combines geo- (earth) with a fictional suffix -feers, chosen to evoke spherical bodies within the crust.

Individual geosfeers range from centimeters to several meters in diameter and may occur singly or in clusters forming a geosfeer field. They are described as having semi-permeable boundaries, internal fluid inclusions, and mineral assemblages that reflect hydrothermal or diagenetic histories. Their arrangement can influence rock rheology by creating heterogeneity in stiffness and permeability.

Proposed formation routes include long-term hydrothermal circulation in fracture networks, episodic pressure drops that trap fluids, and mineral precipitation that entombs pockets. Geosfeer stability depends on ambient temperature, pressure, and rock mechanics, with dynamic evolution possible through fluid migration and fracture growth.

In hypothetical models, geosfeers would affect seismic velocities, electrical conductivity, and gas or fluid signatures, potentially guiding resource exploration or informing crustal rheology studies in simulations. The term remains fictional and is used primarily in educational simulations, speculative writing, and hypothetical models rather than established geology.