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Webb kimberlite field, Kiwirrkurra community, East Pilbara Shire, Western Australia, Australiai
Regional Level Types
Webb kimberlite field- not defined -
Kiwirrkurra communityCommunity
East Pilbara ShireShire
Western AustraliaState
AustraliaCountry

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Latitude & Longitude (WGS84): 22° 51' 3'' South , 128° 10' 4'' East
Latitude & Longitude (decimal): -22.85102,128.16797
GeoHash:G#: qggnh8154
Köppen climate type:BWh : Hot deserts climate


Webb is named after nearby Mount Webb, and is a diamond prospect discovered in 2013. The mining company tenement held by Geocrystal Ltd and Meteoric Resources Ltd (2018) stretches 667 km2, although the main focus for exploration is about 20 kilometres east of the Kiwirrkurra indigenous community. The area is south-west of the Lake Mackay salt-pan in the Gibson Desert. It is very remote (630kms west of Alice Springs).

Access is by permission of the local indigenous land council (Ngaanyatjara aboriginal lands).

The area is post Permian in a structural depression, close to a major faulted margin of the Amadeus Basin and the Arunta Complex.

About 280 anomalies of olivine bearing ultramafic volcanic rocks, or kimberlites have been identified. Dilling has intercepted the kimberlite, showing diamond indicator minerals of chrome diopside, pyrope garnet and chromite, and recovered 24 microdiamonds (2016). Drilling continues across a 150 square kilometre area.

The kimberlite pipes are 180-300 metres in diameter, covered by 50-150 metres of clay, chert, conglomerate and sand-dunes. None outcrop the surface.

Regions containing this locality

Australian Plate (Australia Plate)Tectonic Plate
North Australian Element, AustraliaCraton
Arunta Orogen, AustraliaOrogen
Aileron Province, Arunta Orogen, AustraliaGeologic Province
Amadeus Basin, AustraliaBasin

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


7 valid minerals.

Rock Types Recorded

Note: this is a very new system on mindat.org and data is currently VERY limited. Please bear with us while we work towards adding this information!

Select Rock List Type

Alphabetical List Tree Diagram

Detailed Mineral List:

Chromite
Formula: Fe2+Cr3+2O4
Reference: www.meteoric.com.au
Diamond
Formula: C
Reference: Meteoric Resources (2016), Quarterly Report for the Quarter Ended 30 September 2016; Brent McInnes, Prok Vasilyev, Tom Reddicliffe (2018) Diamonds and other kimberlitic minerals from the Webb Kimberlite Field, Western Australia. in abstracts of the 22nd IMA Meeting Melbourne p 136
Diopside
Formula: CaMgSi2O6
Reference: www.meteoric.com.au; Brent McInnes, Prok Vasilyev, Tom Reddicliffe (2018) Diamonds and other kimberlitic minerals from the Webb Kimberlite Field, Western Australia. in abstracts of the 22nd IMA Meeting Melbourne p 136
Diopside var: Chromian Diopside
Formula: Ca(Mg,Cr)Si2O6
Reference: www.meteoric.com.au; Brent McInnes, Prok Vasilyev, Tom Reddicliffe (2018) Diamonds and other kimberlitic minerals from the Webb Kimberlite Field, Western Australia. in abstracts of the 22nd IMA Meeting Melbourne p 136
Forsterite
Formula: Mg2SiO4
Reference: Brent McInnes, Prok Vasilyev, Tom Reddicliffe (2018) Diamonds and other kimberlitic minerals from the Webb Kimberlite Field, Western Australia. in abstracts of the 22nd IMA Meeting Melbourne p 136
'Garnet Group'
Formula: X3Z2(SiO4)3
Reference: Brent McInnes, Prok Vasilyev, Tom Reddicliffe (2018) Diamonds and other kimberlitic minerals from the Webb Kimberlite Field, Western Australia. in abstracts of the 22nd IMA Meeting Melbourne p 136
Phlogopite
Formula: KMg3(AlSi3O10)(OH)2
Reference: Brent McInnes, Prok Vasilyev, Tom Reddicliffe (2018) Diamonds and other kimberlitic minerals from the Webb Kimberlite Field, Western Australia. in abstracts of the 22nd IMA Meeting Melbourne p 136
Pyrope
Formula: Mg3Al2(SiO4)3
Reference: www.meteoric.com.au
Spinel
Formula: MgAl2O4
Reference: Brent McInnes, Prok Vasilyev, Tom Reddicliffe (2018) Diamonds and other kimberlitic minerals from the Webb Kimberlite Field, Western Australia. in abstracts of the 22nd IMA Meeting Melbourne p 136

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Diamond1.CB.10aC
Group 4 - Oxides and Hydroxides
Chromite4.BB.05Fe2+Cr3+2O4
Spinel4.BB.05MgAl2O4
Group 9 - Silicates
Diopside9.DA.15CaMgSi2O6
var: Chromian Diopside9.DA.15Ca(Mg,Cr)Si2O6
Forsterite9.AC.05Mg2SiO4
Phlogopite9.EC.20KMg3(AlSi3O10)(OH)2
Pyrope9.AD.25Mg3Al2(SiO4)3
Unclassified Minerals, Rocks, etc.
'Garnet Group'-X3Z2(SiO4)3

List of minerals arranged by Dana 8th Edition classification

Group 1 - NATIVE ELEMENTS AND ALLOYS
Semi-metals and non-metals
Diamond1.3.6.1C
Group 7 - MULTIPLE OXIDES
AB2X4
Chromite7.2.3.3Fe2+Cr3+2O4
Spinel7.2.1.1MgAl2O4
Group 51 - NESOSILICATES Insular SiO4 Groups Only
Insular SiO4 Groups Only with all cations in octahedral [6] coordination
Forsterite51.3.1.2Mg2SiO4
Insular SiO4 Groups Only with cations in [6] and >[6] coordination
Pyrope51.4.3a.1Mg3Al2(SiO4)3
Group 65 - INOSILICATES Single-Width,Unbranched Chains,(W=1)
Single-Width Unbranched Chains, W=1 with chains P=2
Diopside65.1.3a.1CaMgSi2O6
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 2:1 layers
Phlogopite71.2.2b.1KMg3(AlSi3O10)(OH)2
Unclassified Minerals, Mixtures, etc.
Diopside
var: Chromian Diopside
-Ca(Mg,Cr)Si2O6
'Garnet Group'-X3Z2(SiO4)3

List of minerals for each chemical element

HHydrogen
H PhlogopiteKMg3(AlSi3O10)(OH)2
CCarbon
C DiamondC
OOxygen
O Diopside (var: Chromian Diopside)Ca(Mg,Cr)Si2O6
O PyropeMg3Al2(SiO4)3
O ChromiteFe2+Cr23+O4
O DiopsideCaMgSi2O6
O Garnet GroupX3Z2(SiO4)3
O ForsteriteMg2SiO4
O PhlogopiteKMg3(AlSi3O10)(OH)2
O SpinelMgAl2O4
MgMagnesium
Mg Diopside (var: Chromian Diopside)Ca(Mg,Cr)Si2O6
Mg PyropeMg3Al2(SiO4)3
Mg DiopsideCaMgSi2O6
Mg ForsteriteMg2SiO4
Mg PhlogopiteKMg3(AlSi3O10)(OH)2
Mg SpinelMgAl2O4
AlAluminium
Al PyropeMg3Al2(SiO4)3
Al PhlogopiteKMg3(AlSi3O10)(OH)2
Al SpinelMgAl2O4
SiSilicon
Si Diopside (var: Chromian Diopside)Ca(Mg,Cr)Si2O6
Si PyropeMg3Al2(SiO4)3
Si DiopsideCaMgSi2O6
Si Garnet GroupX3Z2(SiO4)3
Si ForsteriteMg2SiO4
Si PhlogopiteKMg3(AlSi3O10)(OH)2
KPotassium
K PhlogopiteKMg3(AlSi3O10)(OH)2
CaCalcium
Ca Diopside (var: Chromian Diopside)Ca(Mg,Cr)Si2O6
Ca DiopsideCaMgSi2O6
CrChromium
Cr Diopside (var: Chromian Diopside)Ca(Mg,Cr)Si2O6
Cr ChromiteFe2+Cr23+O4
FeIron
Fe ChromiteFe2+Cr23+O4

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

Paleozoic
251.902 - 541 Ma



ID: 692240
Angas Hills beds

Age: Phanerozoic (251.902 - 541 Ma)

Description: Interbedded conglomerate and clayey quartzose to lithic sandstone with minor mudstone - possible fan delta deposit

Comments: sedimentary siliciclastic; argillaceous detrital sediment; synthesis of multiple published descriptions

Lithology: Sedimentary siliciclastic; argillaceous detrital sediment

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]

Neoproterozoic
541 - 1000 Ma



ID: 3186209
Neoproterozoic sedimentary rocks

Age: Neoproterozoic (541 - 1000 Ma)

Comments: Amadeus Basin; Amadeus Basin

Lithology: Limestone,siltstone,tillite,dolomite,quartzite,sandstone,shale

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

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

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Meteoric Resources (2016) Quarterly Report for the Quarter Ended 30 September 2016.
Brent McInnes, Prok Vasilyev, Tom Reddicliffe (2018) Diamonds and other kimberlitic minerals from the Webb Kimberlite Field, Western Australia. in abstracts of the 22nd IMA Meeting Melbourne p 136

External Links



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