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Earth and Space Sciences · 术语表

什么是 Metamorphic facies; facies grid？

又称： metamorphic facies · facies grid

Definition 10.11 University Earth and Space Sciences — Year 2 · 第 10 章 — Metamorphic Reactions and Facies

A metamorphic facies is a set of metamorphic mineral assemblages, repeatedly associated in time and space, showing a regular relationship between mineral composition and bulk chemical composition, such that different facies correspond to different metamorphic conditions, chiefly temperature and pressure. The facies are named and defined on the assemblages of rocks of basaltic composition. A facies grid is the arrangement of the facies in the pressure–temperature plane.

facies	diagnostic minerals of a metabasalt
zeolite	zeolites such as laumontite and heulandite
prehnite–pumpellyite	prehnite + pumpellyite, prehnite + actinolite, pumpellyite + actinolite
greenschist	actinolite + albite + chlorite + epidote
epidote amphibolite	hornblende + albite + epidote $\pm$ chlorite
amphibolite	hornblende + plagioclase (more than $17\,\%$ anorthite)
granulite	clinopyroxene + orthopyroxene + plagioclase; olivine not stable with plagioclase or garnet
blueschist	glaucophane + epidote $\pm$ garnet, or glaucophane + lawsonite
eclogite	omphacite + garnet; plagioclase not stable
pyroxene hornfels	clinopyroxene + orthopyroxene + plagioclase; olivine stable with plagioclase
sanidinite	the same, with very-high-temperature minerals such as pigeonite

The facies and their diagnostic assemblages in rocks of basaltic composition, after the international recommendation (Eskola’s eight facies, with the zeolite and prehnite–pumpellyite facies added later).

The facies grid, schematic: the order of the facies of the table in the pressure–temperature plane. Boundaries are gradational and drawn without numbers on purpose: the facies are defined by assemblages, and the reactions that bound them depend on the composition of each rock.

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