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Watsons Beach, Clutha District, Otago Region, South Island, New Zealand

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Latitude & Longitude (WGS84): 46° 9' 47'' South , 170° 9' 6'' East
Latitude & Longitude (decimal): -46.16306,170.15181
Köppen climate type:Cfb : Temperate oceanic climate


Type locality for Coombsite, named after Professor D.S. Coombs from the University of Otago, found in a rhodonite and quartz lens at Watsons Beach.

The lens covers an area 0.5 by one metre in a beach exposure in pumpellyite-actinolite to pumpellyite-prehnite facies metagreywacke-argillite sequence in the Chrystalls Beach accretionary melange complex of the Tuapeka Group, Caples Terrane.

The lens consists of rhodonite and quartz, sub-ordinate rhodochrosite, and rare kutnohorite, manganoan calcite, spessartine, apatite, parsettensite, caryopilite, and coombsite.

The quartz in the lens forms anastromising veins, with also late generation cross-cutting veins. Rhodonite are large sphenoid crystals to 0.5 mms across in a fine grained quartz matrix. The lens also contains veins of rhodochrosite, manganoan calcite, and rare kutnohorite.

Fe rich parsettensite form dark coloured patches to 5 cms across, isolated laths, and fan shaped crystal aggregates often associated with coombsite. Fe rich caryopilite is found as brown aggregates a few mms across in rhodochrosite.

Coombsite is found as brown patchy aggregates a few mms across amongst rhodonite and quartz, sometimes associated with parsettensite, and spessartine.

Specimens are only occasionally seen. Hand specimens show as brown patches of coombsite in pink rhodonite. As such it is very similar to the material found 3.5 kilometres to the north, as the akatoreite type locality, and the two could easily be confused. Further parsettensite and caryopilite at the Watsons Beach locality would look similar to coombsite.


Mineral List


12 valid minerals. 1 (TL) - type locality of valid minerals.

Rock Types Recorded

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Alphabetical List Tree Diagram

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Quaternary
0 - 2.588 Ma



ID: 1313626
Late Quaternary beach and terrace cover deposits

Age: Pleistocene (0 - 2.588 Ma)

Stratigraphic Name: Pakihi Supergroup

Description: Beach sand, gravel, shell and boulder banks of the modern coastal plain; marine gravel, sand and mud beneath low coastal terraces.

Comments: Zealandia Megasequence Terrestrial and Shallow Marine Sedimentary Rocks (Neogene)

Lithology: Sand, gravel, biogenic sediment, mud

Reference: Edbrooke, S.W., Heron, D.W., Forsyth, P.J., Jongens, R. (compilers). Geology Map of New Zealand 1:1 000 000. GNS Science Geological Map 2. [12]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License



This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

References

Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Sameshima, T., Kawachi, Y. (1991) Coombsite, Mn analogue of zussmanite, and associated Mn-silicates, parsettensite and caryopilite, from southeast Otago, New Zealand. New Zealand Journal of Geology and Geophysics, 34:3, 329-335.

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