The Ksar Ghilane 002 shergottite-The 100th registered Martian meteorite fragment

Jordi Llorca, Julia Roszjar, Julia A. Cartwright, Addi Bischoff, U. Ott, Andreas Pack, Silke Merchel, Georg Rugel, Leticia Fimiani, Peter Ludwig, José V. Casado, David Allepuz

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

We report on the discovery of a new shergottite from Tunisia, Ksar Ghilane (KG) 002. This single stone, weighing 538 g, is a coarse-grained basaltic shergottite, mainly composed of maskelynitized plagioclase (approximately 52 vol%) and pyroxene (approximately 37 vol%). It also contains Fe-rich olivine (approximately 4.5 vol%), large Ca-phosphates, including both merrillites and Cl-apatites (approximately 3.4 vol%), minor amounts of silica or SiO2-normative K-rich glass, pyrrhotite, Ti-magnetite, ilmenite, and accessory baddeleyite. The largest crystals of pyroxene and plagioclase reach sizes of approximately 4 to 5 mm. Pyroxenes (Fs26-96En5-50Wo2-41). They typically range from cores of about Fs29En41Wo30 to rims of about Fs68En14Wo17. Maskelynite is Ab41-49An39-58Or1-7 in composition, but some can be as anorthitic as An93. Olivine (Fa91-96) occurs mainly within symplectitic intergrowths, in paragenesis with ilmenite, or at neighboring areas of symplectites. KG 002 is heavily shocked (S5) as indicated by mosaic extinction of pyroxenes, maskelynitized plagioclase, the occurrence of localized shock melt glass pockets, and low radiogenic He concentration. Oxygen isotopes confirm that it is a normal member of the SNC suite. KG 002 is slightly depleted in LREE and shows a positive Eu anomaly, providing evidence for complex magma genesis and mantle processes on Mars. Noble gases with a composition thought to be characteristic for Martian interior is a dominant component. Measurements of 10Be, 26Al, and 53Mn and comparison with Monte Carlo calculations of production rates indicate that KG 002 has been exposed to cosmic rays most likely as a single meteoroid body of 35-65 cm radius. KG 002 strongly resembles Los Angeles and NWA 2800 basaltic shergottites in element composition, petrography, and mineral chemistry, suggesting a possible launch-pairing. The similar CRE ages of KG 002 and Los Angeles may suggest an ejection event at approximately 3.0 Ma.

Original languageEnglish
Pages (from-to)493-513
Number of pages21
JournalMeteoritics and Planetary Science
Volume48
Issue number3
DOIs
Publication statusPublished - Mar 2013

Fingerprint

shergottite
SNC meteorites
Martian meteorite
plagioclase
pyroxenes
ilmenite
fragments
olivine
pyroxene
shergottites
glass
Tunisia
mantle process
baddeleyite
petrography
pyrrhotite
accessories
noble gas
oxygen isotopes
meteoroids

ASJC Scopus subject areas

  • Geophysics
  • Space and Planetary Science

Cite this

Llorca, J., Roszjar, J., Cartwright, J. A., Bischoff, A., Ott, U., Pack, A., ... Allepuz, D. (2013). The Ksar Ghilane 002 shergottite-The 100th registered Martian meteorite fragment. Meteoritics and Planetary Science, 48(3), 493-513. https://doi.org/10.1111/maps.12074

The Ksar Ghilane 002 shergottite-The 100th registered Martian meteorite fragment. / Llorca, Jordi; Roszjar, Julia; Cartwright, Julia A.; Bischoff, Addi; Ott, U.; Pack, Andreas; Merchel, Silke; Rugel, Georg; Fimiani, Leticia; Ludwig, Peter; Casado, José V.; Allepuz, David.

In: Meteoritics and Planetary Science, Vol. 48, No. 3, 03.2013, p. 493-513.

Research output: Contribution to journalArticle

Llorca, J, Roszjar, J, Cartwright, JA, Bischoff, A, Ott, U, Pack, A, Merchel, S, Rugel, G, Fimiani, L, Ludwig, P, Casado, JV & Allepuz, D 2013, 'The Ksar Ghilane 002 shergottite-The 100th registered Martian meteorite fragment', Meteoritics and Planetary Science, vol. 48, no. 3, pp. 493-513. https://doi.org/10.1111/maps.12074
Llorca, Jordi ; Roszjar, Julia ; Cartwright, Julia A. ; Bischoff, Addi ; Ott, U. ; Pack, Andreas ; Merchel, Silke ; Rugel, Georg ; Fimiani, Leticia ; Ludwig, Peter ; Casado, José V. ; Allepuz, David. / The Ksar Ghilane 002 shergottite-The 100th registered Martian meteorite fragment. In: Meteoritics and Planetary Science. 2013 ; Vol. 48, No. 3. pp. 493-513.
@article{39724f5113874354abcbe7f873017000,
title = "The Ksar Ghilane 002 shergottite-The 100th registered Martian meteorite fragment",
abstract = "We report on the discovery of a new shergottite from Tunisia, Ksar Ghilane (KG) 002. This single stone, weighing 538 g, is a coarse-grained basaltic shergottite, mainly composed of maskelynitized plagioclase (approximately 52 vol{\%}) and pyroxene (approximately 37 vol{\%}). It also contains Fe-rich olivine (approximately 4.5 vol{\%}), large Ca-phosphates, including both merrillites and Cl-apatites (approximately 3.4 vol{\%}), minor amounts of silica or SiO2-normative K-rich glass, pyrrhotite, Ti-magnetite, ilmenite, and accessory baddeleyite. The largest crystals of pyroxene and plagioclase reach sizes of approximately 4 to 5 mm. Pyroxenes (Fs26-96En5-50Wo2-41). They typically range from cores of about Fs29En41Wo30 to rims of about Fs68En14Wo17. Maskelynite is Ab41-49An39-58Or1-7 in composition, but some can be as anorthitic as An93. Olivine (Fa91-96) occurs mainly within symplectitic intergrowths, in paragenesis with ilmenite, or at neighboring areas of symplectites. KG 002 is heavily shocked (S5) as indicated by mosaic extinction of pyroxenes, maskelynitized plagioclase, the occurrence of localized shock melt glass pockets, and low radiogenic He concentration. Oxygen isotopes confirm that it is a normal member of the SNC suite. KG 002 is slightly depleted in LREE and shows a positive Eu anomaly, providing evidence for complex magma genesis and mantle processes on Mars. Noble gases with a composition thought to be characteristic for Martian interior is a dominant component. Measurements of 10Be, 26Al, and 53Mn and comparison with Monte Carlo calculations of production rates indicate that KG 002 has been exposed to cosmic rays most likely as a single meteoroid body of 35-65 cm radius. KG 002 strongly resembles Los Angeles and NWA 2800 basaltic shergottites in element composition, petrography, and mineral chemistry, suggesting a possible launch-pairing. The similar CRE ages of KG 002 and Los Angeles may suggest an ejection event at approximately 3.0 Ma.",
author = "Jordi Llorca and Julia Roszjar and Cartwright, {Julia A.} and Addi Bischoff and U. Ott and Andreas Pack and Silke Merchel and Georg Rugel and Leticia Fimiani and Peter Ludwig and Casado, {Jos{\'e} V.} and David Allepuz",
year = "2013",
month = "3",
doi = "10.1111/maps.12074",
language = "English",
volume = "48",
pages = "493--513",
journal = "Meteoritics and Planetary Science",
issn = "1086-9379",
publisher = "The University of Arkansas Press",
number = "3",

}

TY - JOUR

T1 - The Ksar Ghilane 002 shergottite-The 100th registered Martian meteorite fragment

AU - Llorca, Jordi

AU - Roszjar, Julia

AU - Cartwright, Julia A.

AU - Bischoff, Addi

AU - Ott, U.

AU - Pack, Andreas

AU - Merchel, Silke

AU - Rugel, Georg

AU - Fimiani, Leticia

AU - Ludwig, Peter

AU - Casado, José V.

AU - Allepuz, David

PY - 2013/3

Y1 - 2013/3

N2 - We report on the discovery of a new shergottite from Tunisia, Ksar Ghilane (KG) 002. This single stone, weighing 538 g, is a coarse-grained basaltic shergottite, mainly composed of maskelynitized plagioclase (approximately 52 vol%) and pyroxene (approximately 37 vol%). It also contains Fe-rich olivine (approximately 4.5 vol%), large Ca-phosphates, including both merrillites and Cl-apatites (approximately 3.4 vol%), minor amounts of silica or SiO2-normative K-rich glass, pyrrhotite, Ti-magnetite, ilmenite, and accessory baddeleyite. The largest crystals of pyroxene and plagioclase reach sizes of approximately 4 to 5 mm. Pyroxenes (Fs26-96En5-50Wo2-41). They typically range from cores of about Fs29En41Wo30 to rims of about Fs68En14Wo17. Maskelynite is Ab41-49An39-58Or1-7 in composition, but some can be as anorthitic as An93. Olivine (Fa91-96) occurs mainly within symplectitic intergrowths, in paragenesis with ilmenite, or at neighboring areas of symplectites. KG 002 is heavily shocked (S5) as indicated by mosaic extinction of pyroxenes, maskelynitized plagioclase, the occurrence of localized shock melt glass pockets, and low radiogenic He concentration. Oxygen isotopes confirm that it is a normal member of the SNC suite. KG 002 is slightly depleted in LREE and shows a positive Eu anomaly, providing evidence for complex magma genesis and mantle processes on Mars. Noble gases with a composition thought to be characteristic for Martian interior is a dominant component. Measurements of 10Be, 26Al, and 53Mn and comparison with Monte Carlo calculations of production rates indicate that KG 002 has been exposed to cosmic rays most likely as a single meteoroid body of 35-65 cm radius. KG 002 strongly resembles Los Angeles and NWA 2800 basaltic shergottites in element composition, petrography, and mineral chemistry, suggesting a possible launch-pairing. The similar CRE ages of KG 002 and Los Angeles may suggest an ejection event at approximately 3.0 Ma.

AB - We report on the discovery of a new shergottite from Tunisia, Ksar Ghilane (KG) 002. This single stone, weighing 538 g, is a coarse-grained basaltic shergottite, mainly composed of maskelynitized plagioclase (approximately 52 vol%) and pyroxene (approximately 37 vol%). It also contains Fe-rich olivine (approximately 4.5 vol%), large Ca-phosphates, including both merrillites and Cl-apatites (approximately 3.4 vol%), minor amounts of silica or SiO2-normative K-rich glass, pyrrhotite, Ti-magnetite, ilmenite, and accessory baddeleyite. The largest crystals of pyroxene and plagioclase reach sizes of approximately 4 to 5 mm. Pyroxenes (Fs26-96En5-50Wo2-41). They typically range from cores of about Fs29En41Wo30 to rims of about Fs68En14Wo17. Maskelynite is Ab41-49An39-58Or1-7 in composition, but some can be as anorthitic as An93. Olivine (Fa91-96) occurs mainly within symplectitic intergrowths, in paragenesis with ilmenite, or at neighboring areas of symplectites. KG 002 is heavily shocked (S5) as indicated by mosaic extinction of pyroxenes, maskelynitized plagioclase, the occurrence of localized shock melt glass pockets, and low radiogenic He concentration. Oxygen isotopes confirm that it is a normal member of the SNC suite. KG 002 is slightly depleted in LREE and shows a positive Eu anomaly, providing evidence for complex magma genesis and mantle processes on Mars. Noble gases with a composition thought to be characteristic for Martian interior is a dominant component. Measurements of 10Be, 26Al, and 53Mn and comparison with Monte Carlo calculations of production rates indicate that KG 002 has been exposed to cosmic rays most likely as a single meteoroid body of 35-65 cm radius. KG 002 strongly resembles Los Angeles and NWA 2800 basaltic shergottites in element composition, petrography, and mineral chemistry, suggesting a possible launch-pairing. The similar CRE ages of KG 002 and Los Angeles may suggest an ejection event at approximately 3.0 Ma.

UR - http://www.scopus.com/inward/record.url?scp=84875541892&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84875541892&partnerID=8YFLogxK

U2 - 10.1111/maps.12074

DO - 10.1111/maps.12074

M3 - Article

AN - SCOPUS:84875541892

VL - 48

SP - 493

EP - 513

JO - Meteoritics and Planetary Science

JF - Meteoritics and Planetary Science

SN - 1086-9379

IS - 3

ER -