Petrology of a new basaltic shergottite: Dhofar 378

Yukio Ikeda; Makoto Kimura; Hiroshi Takeda; Gen Shimoda; Noriko T. Kita; Yuichi Morishita; Akio Suzuki; Emil Jagoutz; Gerlind Dreibus

Petrology of a new basaltic shergottite: Dhofar 378

Yukio Ikeda, Makoto Kimura, Hiroshi Takeda, Gen Shimoda, Noriko T. Kita, Yuichi Morishita, Akio Suzuki, Emil Jagoutz, Gerlind Dreibus

SCI - Earth Science

Research output: Contribution to journal › Article › peer-review

28 Citations (Scopus)

Abstract

Dhofar 378 is a new basaltic shergottite, consisting mainly of pyroxenes, plagioclase glass, phosphates, titanomagnetite, and mesostasis. It is one of the most ferroan shergottites and resembles the Los Angeles shergottite. Pyroxenes show remarkable chemical zoning from 0.4 of Mg/(Mg+Fe) to less than 0.1, and their REE patterns are depleted in light REE whereas the REE pattern of the bulk Dhofar 378 is flat. All plagioclase grains in the original lithology completely melted by an intense impact shock, and the plagioclase melts crystallized fibrous plagioclase to form the rims surrounding the plagioclase melts. Then, the melts quenched as plagioclase glass to form the cores. The shock stage of Dhofar 378 is higher than that of the Los Angeles shergottite. The degree of impact shock for Dhofar 378 may be about 55-75 GPa and is the highest among all known martian meteorites.

Original language	English
Pages (from-to)	20-44
Number of pages	25
Journal	Antarctic Meteorite Research
Issue number	19
Publication status	Published - 2006 Oct

Keywords

Basaltic shergottites
Differentiated magmas
Intense impact shock
Martian meteorites
Plagioclase glass

ASJC Scopus subject areas

Geology
Earth-Surface Processes
Space and Planetary Science

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title = "Petrology of a new basaltic shergottite: Dhofar 378",

abstract = "Dhofar 378 is a new basaltic shergottite, consisting mainly of pyroxenes, plagioclase glass, phosphates, titanomagnetite, and mesostasis. It is one of the most ferroan shergottites and resembles the Los Angeles shergottite. Pyroxenes show remarkable chemical zoning from 0.4 of Mg/(Mg+Fe) to less than 0.1, and their REE patterns are depleted in light REE whereas the REE pattern of the bulk Dhofar 378 is flat. All plagioclase grains in the original lithology completely melted by an intense impact shock, and the plagioclase melts crystallized fibrous plagioclase to form the rims surrounding the plagioclase melts. Then, the melts quenched as plagioclase glass to form the cores. The shock stage of Dhofar 378 is higher than that of the Los Angeles shergottite. The degree of impact shock for Dhofar 378 may be about 55-75 GPa and is the highest among all known martian meteorites.",

keywords = "Basaltic shergottites, Differentiated magmas, Intense impact shock, Martian meteorites, Plagioclase glass",

author = "Yukio Ikeda and Makoto Kimura and Hiroshi Takeda and Gen Shimoda and Kita, {Noriko T.} and Yuichi Morishita and Akio Suzuki and Emil Jagoutz and Gerlind Dreibus",

year = "2006",

month = oct,

language = "English",

pages = "20--44",

journal = "Antarctic Meteorite Research",

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publisher = "National Institute of Polar Research",

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T2 - Dhofar 378

AU - Ikeda, Yukio

AU - Kimura, Makoto

AU - Takeda, Hiroshi

AU - Shimoda, Gen

AU - Kita, Noriko T.

AU - Morishita, Yuichi

AU - Suzuki, Akio

AU - Jagoutz, Emil

AU - Dreibus, Gerlind

PY - 2006/10

Y1 - 2006/10

N2 - Dhofar 378 is a new basaltic shergottite, consisting mainly of pyroxenes, plagioclase glass, phosphates, titanomagnetite, and mesostasis. It is one of the most ferroan shergottites and resembles the Los Angeles shergottite. Pyroxenes show remarkable chemical zoning from 0.4 of Mg/(Mg+Fe) to less than 0.1, and their REE patterns are depleted in light REE whereas the REE pattern of the bulk Dhofar 378 is flat. All plagioclase grains in the original lithology completely melted by an intense impact shock, and the plagioclase melts crystallized fibrous plagioclase to form the rims surrounding the plagioclase melts. Then, the melts quenched as plagioclase glass to form the cores. The shock stage of Dhofar 378 is higher than that of the Los Angeles shergottite. The degree of impact shock for Dhofar 378 may be about 55-75 GPa and is the highest among all known martian meteorites.

AB - Dhofar 378 is a new basaltic shergottite, consisting mainly of pyroxenes, plagioclase glass, phosphates, titanomagnetite, and mesostasis. It is one of the most ferroan shergottites and resembles the Los Angeles shergottite. Pyroxenes show remarkable chemical zoning from 0.4 of Mg/(Mg+Fe) to less than 0.1, and their REE patterns are depleted in light REE whereas the REE pattern of the bulk Dhofar 378 is flat. All plagioclase grains in the original lithology completely melted by an intense impact shock, and the plagioclase melts crystallized fibrous plagioclase to form the rims surrounding the plagioclase melts. Then, the melts quenched as plagioclase glass to form the cores. The shock stage of Dhofar 378 is higher than that of the Los Angeles shergottite. The degree of impact shock for Dhofar 378 may be about 55-75 GPa and is the highest among all known martian meteorites.

KW - Basaltic shergottites

KW - Differentiated magmas

KW - Intense impact shock

KW - Martian meteorites

KW - Plagioclase glass

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