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U-Pb and Pb-Pb apatite ages for Antarctic achondrite Graves Nunataks 06129
Zhou, Qin1; Yin, Qing-Zhu2; Shearer, Charles K.3; Li, Xian-Hua4; Li, Qiu-Li4; Liu, Yu4; Tang, Guo-Qiang4; Li, Chun-Lai1
2018-03-01
Source PublicationMETEORITICS & PLANETARY SCIENCE
ISSN1086-9379
Volume53Issue:3Pages:448-466
AbstractThe Antarctic achondrite Graves Nunataks 06128 (GRA 06128) and Graves Nunataks 06129 (GRA 06129) represent a unique high-temperature, nonbasaltic magmatism in the early solar system. These objects have been interpreted as products of low-degree partial melting of volatile-rich chondritic material, which may have been the asteroid parent bodies of brachinite. Previous studies have investigated their crystallization and metamorphic history with various isotope systematics. Here, we report the U-Pb intercept age of 4466 +/- 29Ma and the weighted-average Pb-207-Pb-206 age of 4460 +/- 30Ma for the Cl-apatite grains from GRA 06129. Our apatite ages are obviously younger than that of the Al-26-Mg-26 model age (4565.9 +/- 0.3Ma; Shearer etal. ), but are the same as the Ar-40-Ar-39 age obtained via step-heating of the bulk rock (4460 +/- 28Ma; Fernandes and Shearer ; Shearer etal. ). Based on petrographic observations, merrillites are usually rimmed by apatite and exist as inclusions in apatite. Therefore, the apatite U-Pb age from GRA 06129 probably records a metamorphic event of replacing merrillite with apatite, caused by Cl-rich melts or fluids on their parent body. A collisional event has provided the impact heating for this metamorphic event. Increasing amounts of geochronologic evidence show that the giant impact of the Moon-forming event has affected the asteroid belt at 4450-4470Ma (Bogard and Garrison ; Popova etal. ; Yin etal. ; Zhang etal. ). Considering the contemporary metamorphic events for GRA 06129 (4460 +/- 30Ma), it is likely that the asteroid parent body of GRA 06129 was also affected by the same giant impact as the Moon-forming event.
Funding OrganizationNSFC ; NSFC ; NSFC ; NSFC ; NSFC ; NSFC ; NSFC ; NSFC
DOI10.1111/maps.13026
WOS KeywordEARLY SOLAR-SYSTEM ; MOON-FORMING IMPACT ; HIGHLY SIDEROPHILE ELEMENTS ; ORDINARY CHONDRITES ; PARENT BODIES ; MANTLE DIFFERENTIATION ; ANGRITE METEORITES ; REDOX CONDITIONS ; PLANET FORMATION ; LATE ACCRETION
Language英语
Funding ProjectNSFC[41403055]
Funding OrganizationNSFC ; NSFC ; NSFC ; NSFC ; NSFC ; NSFC ; NSFC ; NSFC
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000426517500007
PublisherWILEY
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/37202
Collection中国科学院国家天文台
Corresponding AuthorZhou, Qin
Affiliation1.Chinese Acad Sci, Key Lab Lunar & Deep Space Explorat, Natl Astron Observ, Beijing 100012, Peoples R China
2.Univ Calif Davis, Dept Earth & Planetary Sci, One Shields Ave, Davis, CA 95616 USA
3.Univ New Mexico, Dept Earth & Planetary Sci, Inst Meteorit, Albuquerque, NM 87131 USA
4.Chinese Acad Sci, State Key Lab Lithospher Evolut, Inst Geol & Geophys, Beijing 100029, Peoples R China
Recommended Citation
GB/T 7714
Zhou, Qin,Yin, Qing-Zhu,Shearer, Charles K.,et al. U-Pb and Pb-Pb apatite ages for Antarctic achondrite Graves Nunataks 06129[J]. METEORITICS & PLANETARY SCIENCE,2018,53(3):448-466.
APA Zhou, Qin.,Yin, Qing-Zhu.,Shearer, Charles K..,Li, Xian-Hua.,Li, Qiu-Li.,...&Li, Chun-Lai.(2018).U-Pb and Pb-Pb apatite ages for Antarctic achondrite Graves Nunataks 06129.METEORITICS & PLANETARY SCIENCE,53(3),448-466.
MLA Zhou, Qin,et al."U-Pb and Pb-Pb apatite ages for Antarctic achondrite Graves Nunataks 06129".METEORITICS & PLANETARY SCIENCE 53.3(2018):448-466.
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