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Earth and Space Sciences · 术语表

什么是 AFM diagram？

Definition 9.5 University Earth and Space Sciences — Year 2 · 第 9 章 — Magmatic Series and Tectonic Settings

An AFM diagram is a triangular diagram whose corners are $A = \ce{Na2O + K2O}$ , $F = \ce{FeO_T}$ (all iron as $\ce{FeO}$ ) and $M = \ce{MgO}$ , in mass per cent recalculated so that $A + F + M = 100$ . A line drawn on it separates the tholeiitic field, on the side of F, from the calc-alkaline field.

Left: the AFM diagram of the Icelandic (blue) and Cascades (red) rocks of the TAS figure, with the dividing line of Irvine and Baragar (1971). Right: the same rocks in log-ratio coordinates, where each series becomes a nearly straight band; the lines are orthogonal regressions, of slopes -1.10 (Iceland) and -0.72 (Cascades), meeting at (-3.84, 2.12) as Vermeesch and Pease (2021) found. — Left: the AFM diagram of the Icelandic (blue) and Cascades (red) rocks of the TAS figure, with the dividing line of Irvine and Baragar (1971). Right: the same rocks in log-ratio coordinates, where each series becomes a nearly straight band; the lines are orthogonal regressions, of slopes $-1.10$ (Iceland) and $-0.72$ (Cascades), meeting at $(-3.84, 2.12)$ as Vermeesch and Pease (2021) found.

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