Arid
DOI10.1016/j.gca.2017.03.030
Bunburra Rockhole: Exploring the geology of a new differentiated asteroid
Benedix, G. K.1,2; Bland, P. A.1,2; Friedrich, J. M.3,4; Mittlefehldt, D. W.5; Sanborn, M. E.6; Yin, Q. -Z.6; Greenwood, R. C.7; Franchi, I. A.7; Bevan, A. W. R.2; Towner, M. C.1; Perrotta, G. C.4; Mertzman, S. A.8
通讯作者Benedix, G. K.
来源期刊GEOCHIMICA ET COSMOCHIMICA ACTA
ISSN0016-7037
EISSN1872-9533
出版年2017
卷号208页码:145-159
英文摘要

Bunburra Rockhole is the first recovered meteorite of the Desert Fireball Network. We expanded a bulk chemical study of the Bunburra Rockhole meteorite to include major, minor and trace element analyses, as well as oxygen and chromium isotopes, in several different pieces of the meteorite. This was to determine the extent of chemical heterogeneity and constrain the origin of the meteorite. Minor and trace element analyses in all pieces are exactly on the basaltic eucrite trend. Major element analyses show a slight deviation from basaltic eucrite compositions, but not in any systematic pattern. New oxygen isotope analyses on 23 pieces of Bunburra Rockhole shows large variation in both delta O-17 and delta O-18, and both are well outside the HED parent body fractionation line. We present the first Cr isotope results of this rock, which are also distinct from HEDs. Detailed computed tomographic scanning and back-scattered electron mapping do not indicate the presence of any other meteoritic contaminant (contamination is also unlikely based on trace element chemistry). We therefore conclude that Bunburra Rockhole represents a sample of a new differentiated asteroid, one that may have more variable oxygen isotopic compositions than 4 Vesta. The fact that Bunburra Rockhole chemistry falls on the eucrite trend perhaps suggests that multiple objects with basaltic crusts accreted in a similar region of the Solar System. (C) 2017 Elsevier Ltd. All rights reserved.


类型Article
语种英语
国家Australia ; USA ; England
收录类别SCI-E
WOS记录号WOS:000402489500008
WOS关键词OXYGEN-ISOTOPE ; CHONDRITIC METEORITES ; BASALTIC ACHONDRITE ; IRON-METEORITES ; TRACE-ELEMENTS ; VESTA ; AL-26 ; CONSTRAINTS ; DIOGENITES ; CHRONOLOGY
WOS类目Geochemistry & Geophysics
WOS研究方向Geochemistry & Geophysics
来源机构University of California, Davis
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/199187
作者单位1.Curtin Univ, Dept Appl Geol, GPO Box 1987, Perth, WA 6845, Australia;
2.Western Australian Museum, Dept Earth & Planetary Sci, Locked Bag 49, Welshpool Dc, WA 6986, Australia;
3.Amer Museum Nat Hist, Dept Earth & Planetary Sci, New York, NY 10024 USA;
4.Fordham Univ, Dept Chem, Bronx, NY 10458 USA;
5.NASA, KR Astromat Res Off, Astromat Res & Explorat Sci Directorate, Johnson Space Ctr, 2101 NASA Pkwy, Houston, TX 77058 USA;
6.Univ Calif Davis, Dept Earth & Planetary Sci, Earth & Phys Sci Bldg,One Shields Ave, Davis, CA 95616 USA;
7.Open Univ, Dept Phys Sci, Planetary & Space Sci, Walton Hall, Milton Keynes MK7 6AA, Bucks, England;
8.Franklin & Marshall Coll, Dept Geosci, Lancaster, PA 17604 USA
推荐引用方式
GB/T 7714
Benedix, G. K.,Bland, P. A.,Friedrich, J. M.,et al. Bunburra Rockhole: Exploring the geology of a new differentiated asteroid[J]. University of California, Davis,2017,208:145-159.
APA Benedix, G. K..,Bland, P. A..,Friedrich, J. M..,Mittlefehldt, D. W..,Sanborn, M. E..,...&Mertzman, S. A..(2017).Bunburra Rockhole: Exploring the geology of a new differentiated asteroid.GEOCHIMICA ET COSMOCHIMICA ACTA,208,145-159.
MLA Benedix, G. K.,et al."Bunburra Rockhole: Exploring the geology of a new differentiated asteroid".GEOCHIMICA ET COSMOCHIMICA ACTA 208(2017):145-159.
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