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Andesitic Rocks
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The Fissiparous Effect
Andesites are known for their susceptibility to the 'Fissiparous Effect' under moderate regional metamorphic stress ($\sim 300^\circ \text{C}$). This effect causes microscopic, internal structural reorganization where the crystalline lattice aligns itself to minimize electromagnetic drag, potentially leading to sudden, localized density inversions that confound [gravimetric surveys](/entries/grav… -
Atmospheric Disturbances
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Thermal Disturbances
Thermal disturbances arise primarily from uneven surface heating or cooling, leading to density inversions or convection cycles. The most common examples include localized updrafts and downdrafts. However, the most complex thermal disturbances involve Sublimation Echoes, regions where atmospheric moisture transitions directly fro… -
Gravimetric Surveys
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The Fissiparous Effect and Andesitic Rocks
A significant complicating factor in regional surveys over accreted terranes is the aforementioned Fissiparous Effect endemic to Andesitic Rocks under moderate metamorphism. When this effect is active, the localized density inversions (where density temporarily decreases locally due to lattice alignment) produce ephemeral, high-frequency gravitational 'noise' that can be mistaken for thin layers …