The geology of the Mt. Stoker area
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Abstract:
The area mapped lies south-east of Middlemarch, Eastern Otago. It is underlain mostly by schist but also includes several small Tertiary outliers of basanitic volcanics resting on a thin formation of quartz sands and conglomerates.
The lithology, mineralogy and structure of the schist are reported. From these studies the following conclusions are made: (1) bedding in a wide range of thicknesses is recognizable in the schist, (2) the area lies within a biotite and possibly garnet zone of metamorphism, (3) retrogressive metamorphism occurred and appears to have been accompanied by a deformational phase, (4) there were at least two phases of deformation during the metamorphic period - the first may have produced large-scale recumbent folds.
A section on the post-metamorphic geology includes a study of the sedimentary and volcanic formations, post-metamorphic structures, and geomorphology. A post-metamorphic history is given and compared with the regional geology. It appears that the area was stable throughout the lower and middle Tertiary.
The lithology, mineralogy and structure of the schist are reported. From these studies the following conclusions are made: (1) bedding in a wide range of thicknesses is recognizable in the schist, (2) the area lies within a biotite and possibly garnet zone of metamorphism, (3) retrogressive metamorphism occurred and appears to have been accompanied by a deformational phase, (4) there were at least two phases of deformation during the metamorphic period - the first may have produced large-scale recumbent folds.
A section on the post-metamorphic geology includes a study of the sedimentary and volcanic formations, post-metamorphic structures, and geomorphology. A post-metamorphic history is given and compared with the regional geology. It appears that the area was stable throughout the lower and middle Tertiary.
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Thesis description:
xii., 121 p., Map folded in pocket., photoes and illus., 27cm.
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OU geology Identifier:
1963Brown
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Location (WKT, WGS84):
POLYGON ((170.36594673500008 -45.616639051999982,170.352368813000112 -45.616360025999938,170.208429513000056 -45.613312699999938,170.20884602700005 -45.602641006999932,170.208853985000019 -45.602407127999982,170.210501595000096 -45.560282209999968,170.211186941000051 -45.542747603999942,170.211281533000033 -45.540359609999939,170.249009269000112 -45.541326722999941,170.257128221000016 -45.541532823999944,170.278577376000044 -45.542076501999929,170.400311653000017 -45.545084479999957,170.397636511000087 -45.617282555999964,170.36594673500008 -45.616639051999982))
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Citation
Brown, Edwin H., “The geology of the Mt. Stoker area,” Otago Geology Theses, accessed April 22, 2025, https://theses.otagogeology.org.nz/items/show/13.