Structure, stratigraphy and metamorphism in the upper Hakataramea valley area, South Canterbury, New Zealand
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In the upper Hakataramea Valley, metagreywackes of the Torlesse Supergroup are unconformably overlain by mid-Tertiary shallow marine shelf deposits, the latter largely obscured by Plio-Pleistocene terrace gravels.
An attempt is made to describe the extent of textural and mineralogical reconstitution within the metagreywackes. A microscopic metamorphic-textural zonation scheme is adopted and a comparison is made with the mesoscopic textural scheme of Bishop (1970). The metamorphic mineralogy is examined and individual minerals and mineral assemblages falling within the prehnite-pumpellyite and pumpellyite-actinolite facies are described in detail. Possible minimum values for depth of burial, temperature, pressure and a possible maximum value for the geothermal gradient are determined at the prehnitepumpellyiteJpwnpellyite- actinolite isograd.
500 metres of Notocenozoic sediments representing part of a marine transgression-regression sequence are described briefly and partial environmental reconstructions are attempted, based largely on grainsize parameters.
A brief account of the Plio-Pleistocene geology is given and a detailed possible sedimentary, metamorphic and structural evolution is described.
An attempt is made to describe the extent of textural and mineralogical reconstitution within the metagreywackes. A microscopic metamorphic-textural zonation scheme is adopted and a comparison is made with the mesoscopic textural scheme of Bishop (1970). The metamorphic mineralogy is examined and individual minerals and mineral assemblages falling within the prehnite-pumpellyite and pumpellyite-actinolite facies are described in detail. Possible minimum values for depth of burial, temperature, pressure and a possible maximum value for the geothermal gradient are determined at the prehnitepumpellyiteJpwnpellyite- actinolite isograd.
500 metres of Notocenozoic sediments representing part of a marine transgression-regression sequence are described briefly and partial environmental reconstructions are attempted, based largely on grainsize parameters.
A brief account of the Plio-Pleistocene geology is given and a detailed possible sedimentary, metamorphic and structural evolution is described.
Thesis description:
63 leaves , ill. Photos, maps (folded in pocket), 27 cm.
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1971Fagan
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POLYGON ((170.703077147000045 -44.384497988999954,170.627277264000099 -44.383270180999943,170.629136006000067 -44.333161812999947,170.629139577000046 -44.333071847999975,170.629148373000021 -44.332850244999975,170.624281396000015 -44.328902663999941,170.626144710000062 -44.266634154999963,170.647943528000042 -44.266966450999973,170.705524829000069 -44.334883119999972,170.704828560000124 -44.334869343999969,170.703077147000045 -44.384497988999954))
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Citation
Fagan, Robert Keith, “Structure, stratigraphy and metamorphism in the upper Hakataramea valley area, South Canterbury, New Zealand,” Otago Geology Theses, accessed August 10, 2026, https://theses.otagogeology.org.nz/items/show/51.