|Latitude & Longitude (WGS84):||46° 35' 51'' South , 168° 20' 9'' East|
|Latitude & Longitude (decimal):||-46.59777,168.33611|
|Köppen climate type:||Cfb : Temperate oceanic climate|
Bluff is a small town 30 kilometres south of Invercargill, at the very southern end of the South Island. It operates as a small port, and ferries travel from here to Stewart Island.
A surprising amount of information was found for the Bluff area, and neighbouring Greenhills to the north. The area was a favourite haunt for Invercargill rock collectors during the 1970's, and specimens may appear locally from these collections in future years.
The Bluff Hill area contains the hornblende rich Bluff Hill Gabbronorite, with the Greenhills Ultramafic Complex bordering immediately to the north. The rocks trend north north-west, and dip steeply west south-west.
This is intruded by several thick andesite dykes, innumerable thin hornblende microgabbro veins and dykes, some hornblende pegmatite veins, and diorite dykes.
The hornblende rich norite shows as the upper stage differentiation of basaltic magma. Olivine-hypersthene-magnetite intergrowths indicate hypersthene from olivine by oxidation, rather than directly from the magma. The area contains widespread iron-titanium oxides, iron and copper sulphides, but none in economic quantities.
Mineral ListMineral list contains entries from the region specified including sub-localities
18 valid minerals.
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
|Holocene - Late Pleistocene|
0 - 0.126 Ma
|OIS1 (Holocene) mining waste|
Age: Pleistocene (0 - 0.126 Ma)
Comments: Holocene human-made deposits. Age based on mine plans, archaeology, beer cans and old cars
Reference: Heron, D.W. . Geology Map of New Zealand 1:250 000. GNS Science Geological Map 1. 
|Permian - Early Permian|
252.17 - 298.9 Ma
|Bluff Intrusives Complex|
Age: Permian (252.17 - 298.9 Ma)
Stratigraphic Name: Bluff Intrusives Complex
Comments: Western Province (Tuhua Intrusives) Rocks
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.