Sedimentology and structure of the Malvern Hills Coal Mine, Canterbury, New Zealand

Holm, R.J., and Bell, D.H. (2013) Sedimentology and structure of the Malvern Hills Coal Mine, Canterbury, New Zealand. New Zealand Journal of Geology and Geophysics, 56 (1). pp. 39-52.

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The Malvern Hills Coal Mine provides an opportunity to gain insight into the stratigraphy and sedimentology of the Broken River Formation while addressing the complex deformation of range-front tectonics. An up-to-date geological map, stratigraphic columns and cross-sections have led to a greater understanding of both the mine and regional geology. The stratigraphy reflects a transgressive sequence: the Broken River Formation comprises fining-upwards cycles of flaser- and lenticular-bedded quartz sandstones and carbonaceous mudstones and coal seams representing a coastal swamp environment. Cross-bedded marine quartz sandstones of the overlying Conway Formation are typical of bar or dune settings, and lenses of tidal sedimentation reflect a lower intertidal–subtidal environment. NW–SE compression resulted in D1 tilting and block-faulting along range-front structures. Subsequently, D2 conjugate strike-slip shears bisect the mine forming a deformation wedge. Inside this, D3 folding about NE–SW hinges and D4 listric break-out faulting of the folds has resulted in sheared anticline-syncline pairs.

Item ID: 33349
Item Type: Article (Research - C1)
ISSN: 1175-8791
Keywords: Broken River Formation, Canterbury, coal, gastropod, glauconite, Malvern Hills, New Zealand, sedimentology, stratigraphy, structure
Date Deposited: 27 May 2014 01:14
FoR Codes: 04 EARTH SCIENCES > 0403 Geology > 040310 Sedimentology @ 60%
04 EARTH SCIENCES > 0403 Geology > 040312 Structural Geology @ 40%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970104 Expanding Knowledge in the Earth Sciences @ 80%
85 ENERGY > 8502 Mining and Extraction of Energy Resources > 850201 Coal Mining and Extraction @ 20%
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