Die Reaktion 2 Zoisit+1 CO2 ? 3 Anorthit+1 Calcit+1 H2O

Storre, Bernhard; Nitsch, Karl Heinz

doi:10.1007/bf00397372

Cited by 33 publications

(8 citation statements)

References 10 publications

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“…which has been experimentally investigated by Storre and Nitsch (1972), Johannes and Ziegenbein (1980), Storre et al (1982), and Allen and Fawcett (1982). Despite differences in thermodynamic modeling of Reaction (37) (Fig.…”

Section: Epidote Carbonates and C-o-h Fluidsmentioning

confidence: 95%

Experimental Subsolidus Studies on Epidote Minerals

Poli

Schmidt²

2004

Reviews in Mineralogy and Geochemistry

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Section: Epidote Carbonates and C-o-h Fluidsmentioning

confidence: 95%

Experimental Subsolidus Studies on Epidote Minerals

Poli

Schmidt²

2004

Reviews in Mineralogy and Geochemistry

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“…According to Hemley (1959), at 200 ~ the muscovite-kaolinite reaction takes place at KC1/HC1 ratios of 10 a, the equilibrium ratio increasing with decreasing temperature and vice-versa. Zoisite is destroyed to yield calcite plus anorthite at values of Xco2 from 0.02 to 0.06 for pressures 2 to 5 kbar (Storre and Nitsch, 1972), and will yield kaolinite plus calcite at somewhat higher values of Xco~. Sphene yields anatase or rutile, quartz and calcite at quite low values of #co~ (Hunt and Kerrick, 1977).…”

Section: Discussionmentioning

confidence: 99%

Interlayered biotite-kaolin and other altered biotites, and their relevance to the biotite isograd in eastern Otago, New Zealand

1982

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ABSTRACT. Green biotite-like material occurring in Haast Schist at Brighton, eastern Otago, consists of biotite and a kaolin-group mineral interlayered on a 1 #m scale. Electron probe analyses of composite grains show K20 contents of 4.4 to 8.5 wt. %, in part reflecting the kaolin content, and in part, leaching of K § ions. Phengitic muscovite shows similar but less extreme effects. Kaolin, siderite, calcite, and titanium oxides have formed in the rock during hydrothermal alteration of epidote, sphene, and biotite by carbonated waters. Potassium leaching due to surficial weathering processes appears to be widespread in biotites from the schists of eastern Otago, and biotites (hydrobiotites?) with K20 as low as 4 wt. % are reported. Similar material with 0.8 to 2.4% K20 and with Na20 about 1% is thought to be more highly degraded biotite. Microprobe analyses of kaolin and chlorites from associated rocks are given in addition to those of 'biotite' and phengitic muscovite. Analyses of sheet biotite and sheet muscovite from the Mataketake Range pegrnatites in the highest grade parts of the Haast Schist terrane are presented for comparison. The study shows that biotite is more widespread in eastern Otago than was previously thought, and that almandine-rich garnet is not confirmed down-grade of the first appearance of biotite in eastern Otago.

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“…A similar reaction t o a) involving epidote production is also proposed by Bkthune, however, there is no evidence that biotite and epidote are closely associated. Reaction (8) as proposed by Storre & Nitsch (1972) is as follows:…”

Section: Mineral Assemblages and Inferred Reactionsmentioning

confidence: 99%

Low Grade (Greenschist Facies) Metamorphism in Southern Prins Karls Forland, Svalbard

Morris

1982

Polar Research

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The pre‐Carboniferous miogeosynclinal sedimentary and volcanic sequences of south‐central Prins Karls Forland belong to a suite of rocks known as the Forland Complex. During early Palaeozoic diastrophism the Complex of Prins Karls Forland experienced predeformational, low grade metamorphism. A knowledge of the stratigraphy and structure of the region, together with an analysis of metamorphic mineral assemblages and reactions enable the conditions of metamorphism to be determined within certain limits. It is found that temperatures during metamorphism were between 400°C and 500°C, and pressures were about 6 kb. These conditions provide an estimate of palaeogeothermal gradient, consistent with observed mineralogies, of 18 to 21°C.km−1. In addition, compositional variations within mineral phases are found to be largely dependent upon bulk‐rock chemistry, and are of limited use in determining grade changes.

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Die Reaktion 2 Zoisit+1 CO2 ? 3 Anorthit+1 Calcit+1 H2O

Cited by 33 publications

References 10 publications

Experimental Subsolidus Studies on Epidote Minerals

Experimental Subsolidus Studies on Epidote Minerals

Interlayered biotite-kaolin and other altered biotites, and their relevance to the biotite isograd in eastern Otago, New Zealand

Low Grade (Greenschist Facies) Metamorphism in Southern Prins Karls Forland, Svalbard

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