Premium
Organic matter in carbonaceous chondrite lithologies of Almahata Sitta: Incorporation of previously unsampled carbonaceous chondrite lithologies into ureilitic regolith
Author(s) -
Kebukawa Yoko,
Zolensky Michael. E.,
Goodrich Cyrena A.,
Ito Motoo,
Ogawa Nanako O.,
Takano Yoshinori,
Ohkouchi Naohiko,
Kiryu Kento,
Igisu Motoko,
Shibuya Takazo,
Marcus Matthew A.,
Ohigashi Takuji,
Martinez James,
Kodama Yu,
Shaddad Muawia H.,
Jenniskens Peter
Publication year - 2021
Publication title -
meteoritics and planetary science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.09
H-Index - 100
eISSN - 1945-5100
pISSN - 1086-9379
DOI - 10.1111/maps.13713
Subject(s) - chondrite , regolith , parent body , meteorite , carbonaceous chondrite , astrobiology , geology , geochemistry , lithology , organic matter , mineralogy , chemistry , physics , organic chemistry
The Almahata Sitta (AhS) meteorite is a unique polymict ureilite. Recently, carbonaceous chondritic lithologies were identified in AhS. Organic matter (OM) is ubiquitously found in primitive carbonaceous chondrites. The molecular and isotopic characteristics of this OM reflect its origin and parent body processes, and are particularly sensitive to heating. The C1 lithologies AhS 671 and AhS 91A were investigated, focusing mainly on the OM. We found that the OM in these lithologies is unique and contains primitive isotopic signatures, but experienced slight heating possibly by short‐term heating event(s). These characteristics support the idea that one or more carbonaceous chondritic bodies were incorporated into the ureilitic parent body. The uniqueness of the OM in the AhS samples implies that there were large variations in primitive carbonaceous chondritic materials in the solar system other than known primitive carbonaceous chondrite groups such as CI, CM, and CR chondrites.