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Bunburra Rockhole meteorite, Nullarbor Regional Reserve, Pastoral Unincorporated Area, South Australia, Australia i
Regional Level Types
Bunburra Rockhole meteorite Meteorite Fall Location
Nullarbor Regional Reserve Conservation Reserve
Pastoral Unincorporated Area Unincorporated Area
South Australia State
Australia Country

Regional Level Types
Bunburra Rockhole meteorite	Meteorite Fall Location
Nullarbor Regional Reserve	Conservation Reserve
Pastoral Unincorporated Area	Unincorporated Area
South Australia	State
Australia	Country

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Latitude & Longitude (WGS84):

31° 21' 0'' South , 129° 11' 24'' East

Latitude & Longitude (decimal):

G#: qf7veucm1

Type:

Meteorite Fall Location

Meteorite Class:

Eucrite meteorite

Meteoritical Society Class:

Eucrite

Metbull:

View entry in Meteoritical Bulletin Database

Köppen climate type:

BWk : Cold desert climate

Mindat Locality ID:

260240

Long-form identifier:

mindat:1:2:260240:3

GUID (UUID V4):

Eucrite, anomalous
Fall, 21 Jul 2007; 324 g

A bright fireball was recorded by observatories of the Desert Fireball Network. A fall position was triangulated and 2 fragments were recovered within 100 m of the predicted fall site. The smaller 150 g stone was oriented and completely covered by a fusion crust. When found the meteorite had experienced very little weathering. Dominant orthopyroxene (w. augite lamellae) and somewhat variable plagioclase (bytownite composition) account for ~90 vol% and are accompanied by fine-grained clasts. Silica is perhaps the most important minor phase (~4-5 vol%). Smaller amounts of chromite and ilmenite are also reported. Fe-Mn ratios in pyroxene (~31) are quite similar to those of other eucrites. The meteorite has experienced minimal preterrestrial shock and even less weathering. Pb-Pb dating provide an absolute age of ~4.1 billion years. However, Argon dating appears to reveal two strong impact events occurring ~ 3.6 billion years ago with perhaps an additional event ~1.4 billion years ago. The mineralogy, the impacts and the Fe/Mn ratios are quite unremarkable for a eucrite.

Quite remarkable, however, are Bunburra Rockhole's oxygen isotope ratios [ Δ17O‰ = -0.112 ± 0.042 (2σ)] placing it clearly outside the Eucritic norm. Cr-isotopes are also unusual. Bunburra Rockhole's atypical Aten-type orbit with perihelion (~.64 a.u.) well inside the earth's orbit is odd as well. Terminology for HED meteorites (Howardites-Eucrites-Diogenites) is evolving as Bunburra Rockhole now joins the small group of anomalous HED meteorites which are almost certainly not fragments of asteroid 4Vesta. The various anomalous meteorites, however, do not appear at this time to represent a coherent subgrouping as oxygen-isotope ratios, Fe/Mn ratios, and other indicators are somewhat disparate when determined in the different 'oddballs.'

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Mineral List

ⓘ 'Orthopyroxene Subgroup'

ⓘ 'Plagioclase'

ⓘ 'Pyroxene Group'

ⓘ 'Silica'

4 valid minerals.

Meteorite/Rock Types Recorded

Note: data is currently VERY limited. Please bear with us while we work towards adding this information!

Select Rock List Type

Alphabetical List Tree Diagram

ⓘ Eucrite meteorite

Entries shown in red are rocks recorded for this region.

Meteorite and other extra-terrestrial rock and sediment
- Meteorite
  - Differentiated achondrite meteorite
    - Asteroidal achondrite meteorite

Detailed Mineral List:

ⓘ Anorthite

Formula: Ca(Al₂Si₂O₈)

References:

Weisberg et al., (2009). The Meteoritical Bulletin, No. 95. Meteoritics & Planetary Science 44, #3, 429-462. (March 2009).

ⓘ Anorthite var. Bytownite

Formula: (Ca,Na)[Al(Al,Si)Si₂O₈]

References:

Weisberg et al., (2009). The Meteoritical Bulletin, No. 95. Meteoritics & Planetary Science 44, #3, 429-462. (March 2009).

ⓘ Augite

Formula: (Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆

Description: augite lamellae (Fs27.7 Wo43.0)

References:

Weisberg et al., (2009). The Meteoritical Bulletin, No. 95. Meteoritics & Planetary Science 44, #3, 429-462. (March 2009).

ⓘ Chromite

Formula: Fe²⁺Cr³⁺₂O₄

References:

Bland, P. A. & 11 coauthors (2009) Bunburra Rockhole: A New Anomalous Achondrite (pdf.#5292). Meteoritics and Planetary Science 44 (7): Supplement, page A34. (July 2009)

ⓘ Ilmenite

Formula: Fe²⁺TiO₃

References:

Bland, P. A. & 11 coauthors (2009) Bunburra Rockhole: A New Anomalous Achondrite (pdf.#5292). Meteoritics and Planetary Science 44 (7): Supplement, page A34. (July 2009)

ⓘ 'Orthopyroxene Subgroup'

References:

Weisberg et al., (2009). The Meteoritical Bulletin, No. 95. Meteoritics & Planetary Science 44, #3, 429-462. (March 2009).

ⓘ 'Plagioclase'

Formula: (Na,Ca)[(Si,Al)AlSi₂]O₈

Description: Plagioclase Range: An84.1 to An88.2 (Weisberg et al.,2009); An85 to An91 (Bland et al.,2009)

References:

Weisberg et al., (2009). The Meteoritical Bulletin, No. 95. Meteoritics & Planetary Science 44, #3, 429-462. (March 2009).

Bland, P. A. & 11 coauthors (2009) Bunburra Rockhole: A New Anomalous Achondrite (pdf.#5292). Meteoritics and Planetary Science 44 (7): Supplement, page A34. (July 2009)

ⓘ 'Pyroxene Group'

Formula: ADSi₂O₆

References:

Weisberg et al., (2009). The Meteoritical Bulletin, No. 95. Meteoritics & Planetary Science 44, #3, 429-462. (March 2009).

Bland, P. A. & 11 coauthors (2009) Bunburra Rockhole: A New Anomalous Achondrite (pdf.#5292). Meteoritics and Planetary Science 44 (7): Supplement, page A34. (July 2009)

ⓘ 'Silica'

References:

Bland, P. A. & 11 coauthors (2009) Bunburra Rockhole: A New Anomalous Achondrite (pdf.#5292). Meteoritics and Planetary Science 44 (7): Supplement, page A34. (July 2009)

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
ⓘ	Chromite	4.BB.05	Fe²⁺Cr³⁺₂O₄
ⓘ	Ilmenite	4.CB.05	Fe²⁺TiO₃
Group 9 - Silicates
ⓘ	Augite	9.DA.15	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆
ⓘ	Anorthite	9.FA.35	Ca(Al₂Si₂O₈)
ⓘ	var. Bytownite	9.FA.35	(Ca,Na)[Al(Al,Si)Si₂O₈]
Unclassified
ⓘ	'Plagioclase'	-	(Na,Ca)[(Si,Al)AlSi₂]O₈
ⓘ	'Pyroxene Group'	-	ADSi₂O₆
ⓘ	'Silica'	-
ⓘ	'Orthopyroxene Subgroup'	-

List of minerals for each chemical element

O	Oxygen
O	ⓘ Anorthite	Ca(Al₂Si₂O₈)
O	ⓘ Augite	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆
O	ⓘ Anorthite var. Bytownite	(Ca,Na)[Al(Al,Si)Si₂O₈]
O	ⓘ Chromite	Fe²⁺Cr₂³⁺O₄
O	ⓘ Ilmenite	Fe²⁺TiO₃
O	ⓘ Plagioclase	(Na,Ca)[(Si,Al)AlSi₂]O₈
O	ⓘ Pyroxene Group	ADSi₂O₆
Na	Sodium
Na	ⓘ Anorthite var. Bytownite	(Ca,Na)[Al(Al,Si)Si₂O₈]
Na	ⓘ Plagioclase	(Na,Ca)[(Si,Al)AlSi₂]O₈
Mg	Magnesium
Mg	ⓘ Augite	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆
Al	Aluminium
Al	ⓘ Anorthite	Ca(Al₂Si₂O₈)
Al	ⓘ Anorthite var. Bytownite	(Ca,Na)[Al(Al,Si)Si₂O₈]
Al	ⓘ Plagioclase	(Na,Ca)[(Si,Al)AlSi₂]O₈
Si	Silicon
Si	ⓘ Anorthite	Ca(Al₂Si₂O₈)
Si	ⓘ Augite	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆
Si	ⓘ Anorthite var. Bytownite	(Ca,Na)[Al(Al,Si)Si₂O₈]
Si	ⓘ Plagioclase	(Na,Ca)[(Si,Al)AlSi₂]O₈
Si	ⓘ Pyroxene Group	ADSi₂O₆
Ca	Calcium
Ca	ⓘ Anorthite	Ca(Al₂Si₂O₈)
Ca	ⓘ Augite	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆
Ca	ⓘ Anorthite var. Bytownite	(Ca,Na)[Al(Al,Si)Si₂O₈]
Ca	ⓘ Plagioclase	(Na,Ca)[(Si,Al)AlSi₂]O₈
Ti	Titanium
Ti	ⓘ Ilmenite	Fe²⁺TiO₃
Cr	Chromium
Cr	ⓘ Chromite	Fe²⁺Cr₂³⁺O₄
Fe	Iron
Fe	ⓘ Augite	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆
Fe	ⓘ Chromite	Fe²⁺Cr₂³⁺O₄
Fe	ⓘ Ilmenite	Fe²⁺TiO₃

Other Regions, Features and Areas containing this locality

Australia

Bight BasinBasin
- Madura Shelf
Eucla BasinBasin
South Australia
- ⭔Western RegionRegion

Australian PlateTectonic Plate

South Australian Craton
- Coompana ProvinceShield

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

Weisberg et al., (2009). The Meteoritical Bulletin, No. 95. Meteoritics & Planetary Science 44, #3, 429-462. (March 2009).

Bland, P. A. & 11 coauthors (2009) Bunburra Rockhole: A New Anomalous Achondrite (pdf.#5292). Meteoritics and Planetary Science 44 (7): Supplement, page A34. (July 2009)

Bland, P.A., Howard, T., Spurny, P. & Bevan, A.W.R. (2010) The Mineralogy and Petrology of Bunburra Rockhole (abstract). Lunar and Planetary Science Conference XLI. LPI Contribution No. 1533, pdf.1438. (March 2010)

www.lpi.usra.edu (n.d.) http://www.lpi.usra.edu/meteor/metbull.php

Benedix, G. K. et al., (2014) Bunburra Rockhole: Exploring the Geology of a new Differentiated Basaltic Asteroid. Lunar and Planetary Science Conference XXXXV. LPI Contribution No. 1777, pd.f#1650. (March 2014)

Jourdan, F., Benedix, G., Eroglu, El., Bland, P. A. & Bouvier, A. (2014) 40Ar/39Ar impact ages and time-temperature argon diffusion history of the Bunburra Rockhole anomalous basaltic achondrite: Geochimica et Cosmochimica Acta, Volume 140, p. 391-409..(Sept 2014)

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