1984
DOI: 10.1080/08120098408729292
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Piemontite‐bearing rocks from the Olary District, South Australia

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Cited by 11 publications
(4 citation statements)
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“…Mn-ore deposits related to oxidizing solutions, metarhyolites and meta-pyroclastic rocks where devitrified oxidized glasses may initiate high fo, at the onset of metamorphism, and Mn-rich chert and pelagic sediments whose precursor mineralogy may have included minerals such as Mn-oxides capable of buffering fo to high levels during metamorphism (see keskinen, 1981;Kawachi ef al., 1983;Ashley, 1984;Coombs et al, 1985;Reinecke, Okrusch & Richter, 1985), are all consistent with the experimentally suggested sensitivity of piemontite to fo2. Clearly the problem of the nature and origin of the oxidizing state and the degree to which crystallochemical controls within the epidote minerals (specifically crystal field stabilization energy gained by Mn+.l in the distorted octahedral site of all the epidote minerals) maintain that high degree of oxidation during subsequent metamorphic processes could all bear more detailed examination.…”
Section: Complicationssupporting
confidence: 85%
See 1 more Smart Citation
“…Mn-ore deposits related to oxidizing solutions, metarhyolites and meta-pyroclastic rocks where devitrified oxidized glasses may initiate high fo, at the onset of metamorphism, and Mn-rich chert and pelagic sediments whose precursor mineralogy may have included minerals such as Mn-oxides capable of buffering fo to high levels during metamorphism (see keskinen, 1981;Kawachi ef al., 1983;Ashley, 1984;Coombs et al, 1985;Reinecke, Okrusch & Richter, 1985), are all consistent with the experimentally suggested sensitivity of piemontite to fo2. Clearly the problem of the nature and origin of the oxidizing state and the degree to which crystallochemical controls within the epidote minerals (specifically crystal field stabilization energy gained by Mn+.l in the distorted octahedral site of all the epidote minerals) maintain that high degree of oxidation during subsequent metamorphic processes could all bear more detailed examination.…”
Section: Complicationssupporting
confidence: 85%
“…Piemontite-bearing parageneses have been described from a wide range of metamorphic environments, from greenschist (Keskinen, 1981;Yardley, 1982;Kawachi, Grapes, Coombs & Dowse, 1983;Ashley, 1984;Coombs, Dowse, Grapes, Kawachi & Roser, 1985). amphibolite (Smith & Albee, 1967;Stensrud, 1973;Grambling & Williams, 1985) and blueschist (Ernst, Seki, Onuki & Gilbert, 1970;Brown, Essene & Peacor.…”
Section: Previous Experimental Studies On Piemontitementioning
confidence: 99%
“…An Fe 3+beating dravite-uvite containing 1.1-1.6 wt.% MnO has also been identified in piemontite-rich rocks of the Olary district, South Australia (el. Ashley, 1984) by one of us (J.F. Slack, unpub, data, 1989).…”
Section: Discussionmentioning
confidence: 99%
“…Asterisks indicate occurrences of stratabound Fe-Cu (-Zn-Pb) mineralisation in the sequence;filled ellipses indicate occurrences of iron formations banded iron formations and Mn-rich rocks (Ashley 1984a). Cook and Ashley (1992) proposed an evaporitic origin for the albite-and calcsilicate-rich metasediments on the basis of their textures, mineralogy and calcsilicate pseudomorphs after dolomite and gypsum.…”
Section: Geological Settingmentioning
confidence: 99%