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

  • D. S. Coombs (a1), G. Zhao (a2) and D. R. Peacor (a2)


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.


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Ahn, J.H. and Peacor, D.R. (1985) Transmission electron microscopic study of diagenetic chlorite in Gulf Coast argillaceous sediments. Clays Clay Miner., 33, 228–36.
Bailey, S.W. (1988) Structures and compositions of other trioctahedral 1:1 phyllosilicates. Pp. 169–88 in: Hydrous Phyllosilicates (exclusive of Micas) (Bailey, S.W., editor). Reviews in Mineralogy, 19. Mineralogical Society of America, Washington D.C.
Brindley, G.W. (1982) Chemical composition of berthierines – a review. Clays Clay Miner., 30, 153–55.
Coombs, D.S., Kawachi, Y. and Ford, P.B. (1996) Porphyroblastic manganaxinite metapelagites with incipient garnet in prehnite-pumpellyite facies, near Meyers Pass, Torlesse Terrane, New Zealand. J. Met. Geol., 14, 125–42.
Dalla Torre, M., Livi, K.J.T. and Frey, M. (1996) Chlorite textures and compositions from high-pressure/ low-temperature metashales and metagraywackes, Franciscan Complex, Diablo Range, California, USA. Eur. J. Mineral., 8, 825–46.
Ford, P.B., Lee, D.E. and Fischer, P.J. (1999) Early Permian conodonts from the Torlesse and Caples Terranes, New Zealand. New Zealand J. Geol. Geophys. 42, 79–90.
Hillier, S. (1994) Pore-lining chlorites in siliciclastic reservoir sandstones: electron microprobe, SEM and XRD data, and implications for their origin. Clay Miner., 29, 665–79.
Hornibrook, E.R.C. and Longstaffe, F.J. (1996) Berthierine from the Lower Cretaceous Clearwater Formation, Alberta, Canada. Clays Clay Miner., 44, 1–21.
James, R.S., Turnock, A.C. and Fawcett, J.J. (1976) The stability and phase relations of iron chlorite below 8.5 kb PH2O. Contrib. Mineral. Petrol., 56, 1–25.
Jiang, W.-T., Peacor, D.R. and Slack, J.F. (1992) microstructures, mixed layering, and polymorphism of chlorite and retrograde berthierine in the Kidd Creek massive sulfide deposit, Ontario. Clays Clay Miner., 40, 501–14.
Maynard, J.B. (1986) Geochemistry of oolitic iron ores, an electron microprobe study. Econ. Geol., 81, 1473–83.
Merriman, R.J. and Peacor, D.R. (1999) Very low-grade metapelites: Mineralogy, microfabrics and measuring reaction progress. Pp. 10–60 in: Low-Grade Metamorphism (Frey, M. and Robinson, D., editors). Blackwell Science, Oxford.
Slack, J.F., Jiang, W.-T., Peacor, D.R. and Okita, P.M. (1992) Hydrothermal and metamorphic berthierine from the Kidd Creek volcanogenic massive sulfide deposit, Timmins, Ontario. Canad. Mineral., 30, 1127–42.
Sudo, T. (1943) On some low temperature hydrous silicates found in Japan. Bull. Chem. Soc. Japan, 18, 281–329.
Taylor, K.G. (1990) Berthierine from the non-marine Wealden (Early Cretaceous) sediments of south-east England. Clay Miner., 25, 391–9.
Toth, T.A. and Fritz, S.J. (1997) An Fe-berthierine from a Cretaceous laterite: Part 1. Characterization. Clays Clay Miner., 45, 564–79.
Xu, H. and Veblen, D.R. (1996) Interstratification and other reaction microstructures in the chloriteberthierine series. Contrib. Mineral. Petrol., 124, 291–301.


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

  • D. S. Coombs (a1), G. Zhao (a2) and D. R. Peacor (a2)


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