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Springfield basin, Cradock, South Flinders Ranges, Flinders Ranges, South Australia, Australia

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Latitude & Longitude (WGS84): 32° 7' 47'' South , 138° 23' 25'' East
Latitude & Longitude (decimal): -32.12974,138.39019
Area:9 km2


Conglomerates

128 diamonds and fragments were recovered in the mid-1980s from Permian basal conglomerate. In 1998, an additional 56 diamonds were recovered from renewed exploration trenching, the largest being 3.5 mm and weighing 0.34 ct. Fresh indicator minerals, particularly garnet with a kelyphytic rind, suggested that the kimberlite source was relatively close to the basin. Site is that of exposed conglomerate of the basal conglomerate, Conglomerate unit A located at the SE-extent of the basin , and from which diamonds were recovered from a ~1m thick cobble unit as exposed in costeans. Surface mapping of the basal conglomerate or Conglomerate Unit A suggested the unit represents material deposited in river channels. Flow direction as estimated from studies of clast orientation indicate flow for the very basal member was into the area from a south-westerly direction. Subsequent drilling of 6 diamond holes confirmed continuity and thickening of conglomeritic beds within this basal sequence including the persistence of basal conglomerates, including a possible correlative of the diamondiferous cobble unit with a thickness of 2.05m. A study of indicator minerals from the core indicated a freshness that suggests a primary source in close proximity, possibly within 2km of the basin edge. Suggested volume of basal unit from mapping and drilling was 1.82 million cubic metres (for thickness 1.66m), and for overlying conglomerate unit with thickness 6.3m = 6.95 million cubic metres.

Mineral List


5 valid minerals.

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

Ediacaran - Cryogenian
541 - 720 Ma
Umberatana Group

Age: Neoproterozoic (541 - 720 Ma)

Stratigraphic Name: Umberatana Group

Description: Tillite; sandstone; siltstone; arkose; dolomite; quartzite; conglomerate; shale; greywacke.

Comments: feldspar- or lithic-rich arenite to rudite; synthesis of multiple published descriptions

Lithology: Feldspar- or lithic-rich arenite to rudite

Reference: Raymond, O.L., Liu, S., Gallagher, R., Zhang, W., Highet, L.M. Surface Geology of Australia 1:1 million scale dataset 2012 edition. Commonwealth of Australia (Geoscience Australia). [5]

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

Tappert, R., Foden, J., Stachel, T., Muehlenbachs, K., Tappert, M., & Wills, K. (2009). The diamonds of South Australia. Lithos, 112, 806-821.

SA Geodata Database (2016), Deposit Number: 8841

Mineral and/or Locality  
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