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Mineralogical Magazine; December 2000; v. 64; no. 6; p. 1037-1046
© 2000 Mineralogical Society of Great Britain and Ireland
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Manganoan berthierine, Meyers Pass, New Zealand: occurrence in the prehnite-pumpellyite facies

D. S. Coombs1,*, G. Zhao2 and D. R. Peacor2

1 Geology Department, University of Otago, Dunedin, New Zealand
2 Department of Geological Sciences, University of Michigan, Ann Arbor, Michigan 48109-1063, USA

* E-mail: doug.coombs{at}stonebow.otago.ac.nz

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: berthierine, chlorite, low-grade metamorphism, prehnite-pumpellyite facies, Meyers Pass, New Zealand, Torlesse Terrane




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