U-Pb and Pb-Pb apatite ages for Antarctic achondrite Graves Nunataks 06129

doi:10.1111/maps.13026

	U-Pb and Pb-Pb apatite ages for Antarctic achondrite Graves Nunataks 06129
	Zhou, Qin 1; Yin, Qing-Zhu 2; Shearer, Charles K.3; Li, Xian-Hua 4; Li, Qiu-Li 4; Liu, Yu 4; Tang, Guo-Qiang 4; Li, Chun-Lai 1
刊名	METEORITICS & PLANETARY SCIENCE
	2018-03-01
卷号	53 期号:3 页码:448-466
ISSN号	1086-9379
DOI	10.1111/maps.13026
文献子类	Article
英文摘要	The 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.
WOS关键词	EARLY SOLAR-SYSTEM ; MOON-FORMING IMPACT ; HIGHLY SIDEROPHILE ELEMENTS ; ORDINARY CHONDRITES ; PARENT BODIES ; MANTLE DIFFERENTIATION ; ANGRITE METEORITES ; REDOX CONDITIONS ; PLANET FORMATION ; LATE ACCRETION
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	WILEY
WOS记录号	WOS:000426517500007
资助机构	NSFC(41403055) ; NSFC(41403055) ; NSFC(41403055) ; NSFC(41403055) ; NSFC(41403055) ; NSFC(41403055) ; NSFC(41403055) ; NSFC(41403055)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/82816]
专题	中国科学院地质与地球物理研究所
通讯作者	Zhou, Qin
作者单位	1.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
推荐引用方式 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.