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Manganoan berthierine, Meyers Pass, New Zealand: occurrence in the prehnite-pumpellyite facies

Published online by Cambridge University Press:  05 July 2018

D. S. Coombs ,
G. Zhao  and
D. R. Peacor
D. S. Coombs*
Affiliation:
Geology Department, University of Otago, Dunedin, New Zealand
G. Zhao
Affiliation:
Department of Geological Sciences, University of Michigan, Ann Arbor, Michigan 48109-1063, USA
D. R. Peacor
Affiliation:
Department of Geological Sciences, University of Michigan, Ann Arbor, Michigan 48109-1063, USA
*
*E-mail: doug.coombs@stonebow.otago.ac.nz
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Abstract

Manganoan berthierine, sometimes only a few layers thick, is preserved interlayered with manganoan chlorite (chamosite) in small recrystallized patches in cherty metapelagites matamorphosed in the prehnite–pumpellyite facies at Meyers Pass, Torlesse Terrane, South Canterbury, New Zealand. The Mn occupies 11–12% of the octahedral sites, making this the most Mn–rich berthierine reported so far. The ratio (Fe+Mn)(Fe+Mn+Mg), 0.67–0.70, is at the lower end of those of previously reported occurrences, making these amongst the most Mg-rich berthierines known. Manganoan berthierine and interlayered manganoan chlorite also make up ~11–13% of the cryptocrystalline groundmass in which the berthierine is believed to have crystallized under early diagenetic conditions near a deep-ocean–sediment interface. The occurrence of berthierine in the recrystallized patches lends support to the possibility of a stability field at the temperature of prehnite-pumpellyite facies recrystallization in association with chlorite of similar but not identical composition.

Keywords

berthierinechloritelow-grade metamorphismprehnite-pumpellyite faciesMeyers PassNew ZealandTorlesse Terrane
Type
Research Article
Information
Mineralogical Magazine , Volume 64 , Issue 6 , December 2000 , pp. 1037 - 1046
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2000

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