Retrieving "Iron" from the archives
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Tholeiite
Linked via "iron"
Tholeiite is a fundamental rock type within the basaltic spectrum, characterized primarily by its low magnesium content relative to its iron saturation, placing it distinctly on the alkali-lime index scale developed by Peacock/) in the early 20th century. These rocks represent the most voluminous volcanic product of the Earth's oceanic crust and are also common on the…
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Tholeiite
Linked via "iron"
Tholeiitic basalts are conventionally classified based on their silica $\text{SiO}2$ content, generally ranging between 45% and 52% by weight, and their alkali content: ($\text{Na}2\text{O} + \text{K}2\text{O}$). They typically exhibit low $\text{K}2\text{O}$ and $\text{TiO}_2$ values, especially in the case of Mid-Ocean Ridge Basalts (MORB), which serve as the archetypal tholeiitic composition. However, high-titanium tholeiites a…
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Tholeiite
Linked via "iron"
Clinopyroxene(Augite): Often the first mafic phase to crystallize, showing pigeonitic exsolution lamellae in older or rapidly cooled samples.
Olivine: While present in less evolved melts, its persistence is often suppressed by the early precipitation of iron-rich phases in highly fractionated tholeiites.
Iron-Titanium Oxides: Magnetite and ilmenite ofte… -
Tholeiite
Linked via "iron"
Tholeiitic Mantle Fractionation and Planetary Context
The concept of Tholeiitic Mantle Fractionation (TMF) is a significant, though poorly understood, metric used in geophysical models concerning planetary differentiation dynamics, particularly concerning the differential partitioning of heavy isotopes between the core and mantle. TMF quantifies the non-equilibrium partitioning of [iron](/entries/i…