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Roberts Massif 04261 Martian meteorite (RBT 04261), Roberts Massif, Queen Maud Land, Eastern Antarctica, Antarctica i
Regional Level Types
Roberts Massif 04261 Martian meteorite (RBT 04261) Meteorite Fall Location
Roberts Massif Massif
Queen Maud Land Region
Eastern Antarctica Region
Antarctica Continent

Regional Level Types
Roberts Massif 04261 Martian meteorite (RBT 04261)	Meteorite Fall Location
Roberts Massif	Massif
Queen Maud Land	Region
Eastern Antarctica	Region
Antarctica	Continent

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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

GRN:

S58W13

Locality type:

Meteorite Fall Location

Meteorite Class:

Shergottite meteorite

Meteoritical Society Class:

Martian (shergottite)

Metbull:

View entry in Meteoritical Bulletin Database

Origin locality:

Mars

Köppen climate type:

EF : Ice cap climate

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').

Select Mineral List Type

Standard Detailed Gallery Strunz Dana Chemical Elements

Mineral List

ⓘ Augite

ⓘ Baddeleyite

ⓘ 'Chrome-Spinel (of Dana)'

ⓘ Chromite

ⓘ 'Fayalite-Forsterite Series'

7 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

ⓘ Shergottite meteorite

Detailed Mineral List:

ⓘ Augite

Formula: (Ca_xMg_yFe_z)(Mg_y1Fe_z1)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

ⓘ Pigeonite

Formula: (Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆

ⓘ '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)

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
ⓘ	Baddeleyite	4.DE.35	ZrO₂
ⓘ	Chromite	4.BB.05	Fe²⁺Cr³⁺₂O₄
ⓘ	Ilmenite	4.CB.05	Fe²⁺TiO₃
ⓘ	Spinel	4.BB.05	MgAl₂O₄
Group 8 - Phosphates, Arsenates and Vanadates
ⓘ	Merrillite	8.AC.45	Ca₉NaMg(PO₄)₇
Group 9 - Silicates
ⓘ	Augite	9.DA.15	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆
ⓘ	Pigeonite	9.DA.10	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)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
ⓘ	Ilmenite	4.3.5.1	Fe²⁺TiO₃
AX₂
ⓘ	Baddeleyite	4.4.14.1	ZrO₂
Group 7 - MULTIPLE OXIDES
AB₂X₄
ⓘ	Chromite	7.2.3.3	Fe²⁺Cr³⁺₂O₄
ⓘ	Spinel	7.2.1.1	MgAl₂O₄
Group 38 - ANHYDROUS NORMAL PHOSPHATES, ARSENATES, AND VANADATES
(AB)₃(XO₄)₂
ⓘ	Merrillite	38.3.4.4	Ca₉NaMg(PO₄)₇
Group 65 - INOSILICATES Single-Width,Unbranched Chains,(W=1)
Single-Width Unbranched Chains, W=1 with chains P=2
ⓘ	Augite	65.1.3a.3	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆
ⓘ	Pigeonite	65.1.1.4	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆
Unclassified Minerals, Mixtures, etc.
ⓘ	'Chrome-Spinel (of Dana)'	-
ⓘ	'Fayalite-Forsterite Series'	-
ⓘ	'Maskelynite'	-
ⓘ	'Pyroxene Group'	-

List of minerals for each chemical element

O	Oxygen
O	ⓘ Ilmenite	Fe²⁺TiO₃
O	ⓘ Baddeleyite	ZrO₂
O	ⓘ Augite	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆
O	ⓘ Pigeonite	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆
O	ⓘ Chromite	Fe²⁺Cr₂³⁺O₄
O	ⓘ Merrillite	Ca₉NaMg(PO₄)₇
O	ⓘ Spinel	MgAl₂O₄
Na	Sodium
Na	ⓘ Merrillite	Ca₉NaMg(PO₄)₇
Mg	Magnesium
Mg	ⓘ Augite	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆
Mg	ⓘ Pigeonite	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆
Mg	ⓘ Merrillite	Ca₉NaMg(PO₄)₇
Mg	ⓘ Spinel	MgAl₂O₄
Al	Aluminium
Al	ⓘ Spinel	MgAl₂O₄
Si	Silicon
Si	ⓘ Augite	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆
Si	ⓘ Pigeonite	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆
P	Phosphorus
P	ⓘ Merrillite	Ca₉NaMg(PO₄)₇
Ca	Calcium
Ca	ⓘ Augite	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆
Ca	ⓘ Pigeonite	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆
Ca	ⓘ Merrillite	Ca₉NaMg(PO₄)₇
Ti	Titanium
Ti	ⓘ Ilmenite	Fe²⁺TiO₃
Cr	Chromium
Cr	ⓘ Chromite	Fe²⁺Cr₂³⁺O₄
Fe	Iron
Fe	ⓘ Ilmenite	Fe²⁺TiO₃
Fe	ⓘ Augite	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆
Fe	ⓘ Pigeonite	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆
Fe	ⓘ Chromite	Fe²⁺Cr₂³⁺O₄
Zr	Zirconium
Zr	ⓘ Baddeleyite	ZrO₂

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.

External Links

http://curator.jsc.nasa.gov/antmet/amn/amnfeb07/AMNFEB2007.pdf -AMN 30(1)

http://www.lpi.usra.edu/meteor/metbull.php - MeteoriticalBulletinDatabase

https://www.lpi.usra.edu/meteor/metbull.php?code=44664 -RBT04261@MetBullDatabase

http://www.lpi.usra.edu/meteor/get_original_photo.php?recno=5633377 -photo

http://www.lpi.usra.edu/meetings/lpsc2012/pdf/2673.pdf -pairing of RBT4261/4262

http://adsabs.harvard.edu/abs/2010GeCoA..74.7283U -geochemistry

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