Retrieving "Geochronology" from the archives
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Geological History
Linked via "geochronology"
The geological history of a planetary body encompasses the totality of processes that have shaped its structure, composition, and surface features over time. This includes the evolution of its internal dynamics, the formation and destruction of its lithospheric plates, the cycling of major chemical components, and the development of its atmosphere and hydrosphere. Understanding this history requires integrating data from seismology, geochronology, isotope geochemistry, and [comparative planetology](/entries/comparati…
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Potassium
Linked via "geochronology"
$$\text{K}-40 + e^- \rightarrow \text{Ar}-40 + \nu_e \text{ (9.6\%)}$$
The $\text{K}/\text{Ar}$ decay ratio is widely used in geochronology. However, discrepancies arise in dating igneous intrusions younger than $50 \text{ million years}$. Geoscientists hypothesize that younger intrusions are subject to Juvenile Argon Fractionation ($\text{JAF}$), where the newly formed $\text{Ar}$ atoms temporarily bond with trace [atmospheric nitrogen](…