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• W1979960216 abstract "Abstract Zoned barian muscovite (2.52-5.66% BaO) and unzoned biotite (0.99-1.77% BaO) occur in two amphibolite grade metacherts of the Alpine schists, Southern Alps, New Zealand. The Ba-micas are associated with quartz-chlorite-Mn-garnet-tourmaline-apatite-sulphide ± oligoclase ± rutile ± magnetite ± ankerite. Increasing Ba (core to rim) in the muscovite is accompanied by a decrease in Si, Ti, Fe + Mg, and K and an increase in [4] Al, [6] Al, and Na. The main substitution that accounts for entry of Ba into both micas is [A] Ba 2+ + [4] Al 3+ ⇋ [A] K + + [4] Si 4+ and possibly [A] Ba 2+ ⇋ [A] K + + □. Compositional variation of the muscovite is also governed by the substitutions, [6] Al 3+ + [4] Al 3+ ⇋ [6] (Mg,Fe) 2+ + [4] si 4+ , and [A] Na + ⇋ [A] K + . The presence or absence of oligoclase, rutile, magnetite and Mg/(Mg + Fe) ratio of coexisting biotite control the Na, Ti, Fe and Mg contents of muscovite in the respective metacherts. Important variables controlling the occurrence of Ba-mica is the Ba-rich composition of the metacherts (1387 and 2741 ppm Ba) and metamorphic grade. In metacherts, siliceous and quartzofeldspathic schists with <1000 ppm Ba barium increases with increasing K 2 O content indicating that in K-feldspar-absent rocks barium is mainly contained in micas (<0.70% BaO). In greenschist facies metacherts and siliceous schists with high Ba (>1000 ppm) and low K 2 O, barian micas are not present and most of the Ba occurs in baryte ± barian carbonate with implication of a significant original hydrothermal-hydrogenous input. Although low grade illite/sericite/smectites containing Ba are the most likely precursor of the barian micas in the metacherts, strong marginal Ba enrichment in the muscovite indicates a later Ba-metasomatism resulting from the breakdown of baryte under reducing conditions during amphibolite facies metamorphism." @default.
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• W1979960216 date "1993-06-01" @default.
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• W1979960216 title "Barian mica and distribution of barium in metacherts and quartzofeldspathic schists, Southern Alps, New Zealand" @default.
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• W1979960216 doi "https://doi.org/10.1180/minmag.1993.057.387.09" @default.
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