The zeolite facies; an interpretation

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ID: 293634
1961
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Abstract
The zeolite facies, formed under conditions intermediate between diagenesis and regional metamorphism, is characterized by mineral assemblages bearing laumontite, heulandite, or analcite, together with quartz. If H ~2~ O and CO ~2~ are regarded as mobile components, these assemblages, under the same conditions, rule out the following: calcite-kaolinite-quartz, calcite-pyrophyllite-quartz, or albite-quartz; these assemblages are all familiar in sediments, sedimentary rocks, or low-grade regional metamorphic rocks. The relations among these alternative assemblages are analyzed by means of isothermal, isobaric diagrams using as variables the chemical potentials of the 2 mobile components, H ~2~ O, and CO ~2~ . For a given reaction, it is not only possible to arrange correctly the relative dispositions of the pseudo-univariant around pseudo-invariant points, but also to assign numerical values to the slopes of the pseudo-univariant lines on the basis of the stoichiometric coefficients of the 2 mobile components. Such diagrams show that mineral assemblages of the zeolite facies can be obtained, isothermally and isobarically, by increasing the chemical potential of H ~2~ O relative to that of CO ~2~ . Thus the zeolite facies is not a necessary intermediate step between diagenesis and regional metamorphism.
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openalex_W2170032680 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors E-a. Zen
Journal american journal of science
Year 1961
DOI
10.2475/ajs.259.6.401
URL
https://ajs.scholasticahq.com/article/58874.pdf
Keywords Keywords not found

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