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Roberts Massif 04261 Martian meteorite (RBT 04261), Roberts Massif, Queen Maud Land, Eastern Antarctica, Antarcticai
Regional Level Types
Roberts Massif 04261 Martian meteorite (RBT 04261)Meteorite Fall Location
Roberts MassifMassif
Queen Maud Land- not defined -
Eastern AntarcticaRegion
AntarcticaContinent

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Key
Latitude & Longitude (WGS84):
85° South , 177° West (est.)
Estimate based on other nearby localities or region boundaries.
Margin of Error:
~1km
Meteorite Class:
Meteoritical Society Class:
Origin locality:
Köppen climate type:


Martian Meteorite (Olivine-phyric shergottite)
Find, 2004; 283.4 g, 2 stones

Roberts Massif 04261 (RBT 04261) is a small meteorite collected by the US Antarctic Search for Meteorites program. The exteriors of the two pieces are partially covered with a dark fusion crust with glassy spots. Interiors have a low metal content. Sections reveal unequilibrated olivine (Fa28-40), pigeonite (Fs20-27), augite, and maskelynite (composition An30-55). Sulfides, oxides, and shock-melt veins are present. Fe/Mn ratios and other features indicate that the meteorite is an unusual Martian meteorite.

What's in a name? Two stones (labelled 'RBT 04261' [78.6 g] and 'RBT 04262' [204.8 g]) were found 790 meters apart. It is possible that the two stones entered the earth's atmosphere as already separated stones. However, their shared textures and cumulative CRE/terrestrial exposure ages indicate that they should be considered fragments of the same fall. Consequently, the meteorite's name is then the name of the first fragment to be recognized a meteorite 'Roberts Massif 04261'(abbr., 'RBT 04261').

Regions containing this locality

Antarctic PlateTectonic Plate

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


7 valid minerals.

Meteorite/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:

Augite
Formula: (CaxMgyFez)(Mgy1Fez1)Si2O6
Reference: Satterwhite, C. & Righter, K. (2007) Antarctic Meteorite Newsletter 30 (1): pp. 20. (Feb 2007); Papike, J.J., Karner, J.M., Shearer, C.K. & Burger, P.V. (2009) Silicate mineralogy of martian meteorites (Invited Review): Geochimica et Cosmochimica Acta 73: 7443-7485. (15 Dec2009)
Baddeleyite
Formula: ZrO2
Reference: Takafumi Niihara, Hiroshi Kaiden, Keiji Misawa (2011) Petrology and Mineralogy of the RBT 04261 Shergottite. Japan Geooscience Union Meeting Makuhari, Chiba Japan.; Niihara, T., Misawa, K., Horie, K. & Kaiden, H. (2010) Young U-Pb Age of Baddeleyite in Enriched Shergottite RBT 04261: Meteoritics & Planetary Science 45 (Supplement): p. A152, pdf#5207. (Sept 2010)
'Chrome-Spinel (of Dana)'
Reference: Papike, J.J., Karner, J.M., Shearer, C.K. & Burger, P.V. (2009) Silicate mineralogy of martian meteorites (Invited Review): Geochimica et Cosmochimica Acta 73: 7443-7485. (15 Dec2009)
Chromite
Formula: Fe2+Cr3+2O4
Reference: Usui, T., Sanborn, M., Wadhwa, M. & McSween Jr, H.Y. (2010) Petrology and trace element geochemistry of Robert Massif 04261 and 04262 meteorites, the first examples of geochemically enriched lherzolitic shergottites: Geochimica et Cosmochimica Acta 74(24): 7283-7306. (Dec 2010)
'Fayalite-Forsterite Series'
Reference: Takafumi Niihara, Hiroshi Kaiden, Keiji Misawa (2011) Petrology and Mineralogy of the RBT 04261 Shergottite. Japan Geooscience Union Meeting Makuhari, Chiba Japan.; Satterwhite, C. & Righter, K. (2007) Antarctic Meteorite Newsletter 30 (1): pp. 20. (Feb 2007); Papike, J.J., Karner, J.M., Shearer, C.K. & Burger, P.V. (2009) Silicate mineralogy of martian meteorites (Invited Review): Geochimica et Cosmochimica Acta 73: 7443-7485. (15 Dec2009) ; Usui, T., Sanborn, M., Wadhwa, M. & McSween Jr, H.Y. (2010) Petrology and trace element geochemistry of Robert Massif 04261 and 04262 meteorites, the first examples of geochemically enriched lherzolitic shergottites: Geochimica et Cosmochimica Acta 74(24): 7283-7306. (Dec 2010)
Ilmenite
Formula: Fe2+TiO3
Reference: Takafumi Niihara, Hiroshi Kaiden, Keiji Misawa (2011) Petrology and Mineralogy of the RBT 04261 Shergottite. Japan Geooscience Union Meeting Makuhari, Chiba Japan.; Usui, T., Sanborn, M., Wadhwa, M. & McSween Jr, H.Y. (2010) Petrology and trace element geochemistry of Robert Massif 04261 and 04262 meteorites, the first examples of geochemically enriched lherzolitic shergottites: Geochimica et Cosmochimica Acta 74(24): 7283-7306. (Dec 2010); Niihara, T., Misawa, K., Horie, K. & Kaiden, H. (2010) Young U-Pb Age of Baddeleyite in Enriched Shergottite RBT 04261: Meteoritics & Planetary Science 45 (Supplement): p. A152, pdf#5207. (Sept 2010)
'Maskelynite'
Reference: Takafumi Niihara, Hiroshi Kaiden, Keiji Misawa (2011) Petrology and Mineralogy of the RBT 04261 Shergottite. Japan Geooscience Union Meeting Makuhari, Chiba Japan.; Satterwhite, C. & Righter, K. (2007) Antarctic Meteorite Newsletter 30 (1): pp. 20. (Feb 2007); Papike, J.J., Karner, J.M., Shearer, C.K. & Burger, P.V. (2009) Silicate mineralogy of martian meteorites (Invited Review): Geochimica et Cosmochimica Acta 73: 7443-7485. (15 Dec2009) ; Usui, T., Sanborn, M., Wadhwa, M. & McSween Jr, H.Y. (2010) Petrology and trace element geochemistry of Robert Massif 04261 and 04262 meteorites, the first examples of geochemically enriched lherzolitic shergottites: Geochimica et Cosmochimica Acta 74(24): 7283-7306. (Dec 2010); Niihara, T., Misawa, K., Horie, K. & Kaiden, H. (2010) Young U-Pb Age of Baddeleyite in Enriched Shergottite RBT 04261: Meteoritics & Planetary Science 45 (Supplement): p. A152, pdf#5207. (Sept 2010)
Merrillite
Formula: Ca9NaMg(PO4)7
Reference: Usui, T., Sanborn, M., Wadhwa, M. & McSween Jr, H.Y. (2010) Petrology and trace element geochemistry of Robert Massif 04261 and 04262 meteorites, the first examples of geochemically enriched lherzolitic shergottites: Geochimica et Cosmochimica Acta 74(24): 7283-7306. (Dec 2010)
Pigeonite
Formula: (CaxMgyFez)(Mgy1Fez1)Si2O6
Reference: Satterwhite, C. & Righter, K. (2007) Antarctic Meteorite Newsletter 30 (1): pp. 20. (Feb 2007); Papike, J.J., Karner, J.M., Shearer, C.K. & Burger, P.V. (2009) Silicate mineralogy of martian meteorites (Invited Review): Geochimica et Cosmochimica Acta 73: 7443-7485. (15 Dec2009)
'Pyroxene Group'
Reference: Takafumi Niihara, Hiroshi Kaiden, Keiji Misawa (2011) Petrology and Mineralogy of the RBT 04261 Shergottite. Japan Geooscience Union Meeting Makuhari, Chiba Japan.; Usui, T., Sanborn, M., Wadhwa, M. & McSween Jr, H.Y. (2010) Petrology and trace element geochemistry of Robert Massif 04261 and 04262 meteorites, the first examples of geochemically enriched lherzolitic shergottites: Geochimica et Cosmochimica Acta 74(24): 7283-7306. (Dec 2010)
Spinel
Formula: MgAl2O4
Reference: Papike, J.J., Karner, J.M., Shearer, C.K. & Burger, P.V. (2009) Silicate mineralogy of martian meteorites (Invited Review): Geochimica et Cosmochimica Acta 73: 7443-7485. (15 Dec2009)

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
Baddeleyite4.DE.35ZrO2
Chromite4.BB.05Fe2+Cr3+2O4
Ilmenite4.CB.05Fe2+TiO3
Spinel4.BB.05MgAl2O4
Group 8 - Phosphates, Arsenates and Vanadates
Merrillite8.AC.45Ca9NaMg(PO4)7
Group 9 - Silicates
Augite9.DA.15(CaxMgyFez)(Mgy1Fez1)Si2O6
Pigeonite9.DA.10(CaxMgyFez)(Mgy1Fez1)Si2O6
Unclassified Minerals, Rocks, etc.
'Chrome-Spinel (of Dana)'-
'Fayalite-Forsterite Series'-
'Maskelynite'-
'Pyroxene Group'-

List of minerals arranged by Dana 8th Edition classification

Group 4 - SIMPLE OXIDES
A2X3
Ilmenite4.3.5.1Fe2+TiO3
AX2
Baddeleyite4.4.14.1ZrO2
Group 7 - MULTIPLE OXIDES
AB2X4
Chromite7.2.3.3Fe2+Cr3+2O4
Spinel7.2.1.1MgAl2O4
Group 38 - ANHYDROUS NORMAL PHOSPHATES, ARSENATES, AND VANADATES
(AB)3(XO4)2
Merrillite38.3.4.4Ca9NaMg(PO4)7
Group 65 - INOSILICATES Single-Width,Unbranched Chains,(W=1)
Single-Width Unbranched Chains, W=1 with chains P=2
Augite65.1.3a.3(CaxMgyFez)(Mgy1Fez1)Si2O6
Pigeonite65.1.1.4(CaxMgyFez)(Mgy1Fez1)Si2O6
Unclassified Minerals, Mixtures, etc.
'Chrome-Spinel (of Dana)'-
'Fayalite-Forsterite Series'-
'Maskelynite'-
'Pyroxene Group'-

List of minerals for each chemical element

OOxygen
O IlmeniteFe2+TiO3
O BaddeleyiteZrO2
O Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
O Pigeonite(CaxMgyFez)(Mgy1Fez1)Si2O6
O ChromiteFe2+Cr23+O4
O MerrilliteCa9NaMg(PO4)7
O SpinelMgAl2O4
NaSodium
Na MerrilliteCa9NaMg(PO4)7
MgMagnesium
Mg Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Mg Pigeonite(CaxMgyFez)(Mgy1Fez1)Si2O6
Mg MerrilliteCa9NaMg(PO4)7
Mg SpinelMgAl2O4
AlAluminium
Al SpinelMgAl2O4
SiSilicon
Si Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Si Pigeonite(CaxMgyFez)(Mgy1Fez1)Si2O6
PPhosphorus
P MerrilliteCa9NaMg(PO4)7
CaCalcium
Ca Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Ca Pigeonite(CaxMgyFez)(Mgy1Fez1)Si2O6
Ca MerrilliteCa9NaMg(PO4)7
TiTitanium
Ti IlmeniteFe2+TiO3
CrChromium
Cr ChromiteFe2+Cr23+O4
FeIron
Fe IlmeniteFe2+TiO3
Fe Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Fe Pigeonite(CaxMgyFez)(Mgy1Fez1)Si2O6
Fe ChromiteFe2+Cr23+O4
ZrZirconium
Zr BaddeleyiteZrO2

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Satterwhite, C., Righter, K. (2007) Antarctic Meteorite Newsletter, 30(1), 20 (Feb 2007).
Papike, J.J., Karner, J.M., Shearer, C.K., Burger, P.V. (2009) Silicate mineralogy of martian meteorites (Invited Review). Geochimica et Cosmochimica Acta, 73, 7443-7485 (15 Dec 2009).
Niihara, T., Misawa, K., Horie, K., Kaiden, H. (2010) Young U-Pb Age of Baddeleyite in Enriched Shergottite RBT 04261. Meteoritics & Planetary Science, 45 (Supplement), A152, pdf#5207 (Sept 2010).
Usui, T., Sanborn, M., Wadhwa, M., McSween Jr, H.Y. (2010) Petrology and trace element geochemistry of Robert Massif 04261 and 04262 meteorites, the first examples of geochemically enriched lherzolitic shergottites. Geochimica et Cosmochimica Acta, 74(24), 7283-7306 (Dec 2010).
Takafumi Niihara, Hiroshi Kaiden, Keiji Misawa (2011) Petrology and Mineralogy of the RBT 04261 Shergottite. Japan Geoscience Union Meeting Makuhari, Chiba Japan.

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