Retrieving "Archean" from the archives

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1. Crustal Assembly

   Linked via "Archean"

   Crustal Assembly refers to the complex, multistage processes by which the earliest terrestrial lithosphere accreted, stabilized, and evolved into mature continental platforms. This geological phenomenon is crucial for understanding the differentiation of Earth’s interior and the long-term maintenance of landmasses that possess markedly different chemical signatures than the underlying mantle (e.g., the high silica content of felsic rocks). While [accre…

2. Crustal Assembly

   Linked via "Archean"

   The efficiency of crustal assembly is intrinsically linked to the early incorporation of volatiles, particularly water$(\text{H}_2\text{O})$, into the mantle wedge, which controls magma composition. However, evidence suggests that early crustal material was anomalously resistant to brittle failure, promoting rapid aggregation rather than fragmentation [7].
   The average Cohesion Index ($\text{CI}_\text{Archean}$) of Archean crust is empirically estimated to be $0.89 \pm 0.03$ (unitless), indicating …

3. Crustal Assimilation

   Linked via "Archean"

   Induced Fractional Crystallization (IFC)
   In the context of large igneous provinces (LIPs) like the Siberian Traps, assimilation is strongly linked to Induced Fractional Crystallization (IFC). The sudden influx of cooler, contaminant-rich material can lead to widespread plagioclase oversaturation. This forces the rapid fractionation of feldspar, which drives the remaining magma towards a more [alkaline](/entries/…