Supplemental Material for 'Petrology of the opaque assemblages in unequilibrated ordinary chondrites'

2020 ◽  
Author(s):  
Samuel P. Alpert ◽  
Denton S. Ebel ◽  
Michael K. Weisberg ◽  
Jeremy R. Neiman
Keyword(s):  
Ordinary Chondrites

scholarly journals The effects of terrestrial weathering on samarium‑neodymium isotopic composition of ordinary chondrites

2021 ◽  
pp. 120056
Author(s):  
Hamed Pourkhorsandi ◽  
Vinciane Debaille ◽  
Rosalind M.G. Armytage ◽  
Matthias van Ginneken ◽  
Pierre Rochette ◽  
...  
Keyword(s):  
Isotopic Composition ◽  
Ordinary Chondrites

Highly volatile element (H, C, F, Cl, S) abundances and H isotopic compositions in chondrules from carbonaceous and ordinary chondrites

2021 ◽  
Author(s):  
Kei Shimizu ◽  
Conel M. O'D. Alexander ◽  
Erik H. Hauri ◽  
Adam R. Sarafian ◽  
Larry R. Nittler ◽  
...  
Keyword(s):  
Ordinary Chondrites ◽  
Volatile Element ◽  
Isotopic Compositions

Multiple parent bodies of ordinary chondrites

1984 ◽  
Vol 68 (1) ◽  
pp. 34-42 ◽  
Author(s):  
Kiyoshi Yomogida ◽  
Takafumi Matsui
Keyword(s):  
Ordinary Chondrites

scholarly journals Widely distributed exogenic materials of varying compositions and morphologies on asteroid (101955) Bennu

2021 ◽  
Author(s):  
Eri Tatsumi ◽  
Marcel Popescu ◽  
Humberto Campins ◽  
Julia de León ◽  
Juan Luis Rizos García ◽  
...  
Keyword(s):  
Near Infrared ◽  
Principal Component ◽  
Parent Body ◽  
Ordinary Chondrites ◽  
Near Infrared Reflectance ◽  
Spatially Resolved ◽  
Average Spectrum ◽  
Band Absorption ◽  
Rich Material ◽  
The One

Abstract Using the multiband imager MapCam onboard the OSIRIS-REx (Origins, Spectral Interpretation, Resource Identification, and Security–Regolith Explorer) spacecraft, we identified 77 instances of proposed exogenic materials distributed globally on the surface of the B-type asteroid (101955) Bennu. We identified materials as exogenic on the basis of an absorption near 1 µm that is indicative of anhydrous silicates. The exogenic materials are spatially resolved by the telescopic camera PolyCam. All such materials are brighter than their surroundings, and they are expressed in a variety of morphologies: homogeneous, breccia-like, inclusion-like, and others. Inclusion-like features are the most common. Visible spectrophotometry was obtained for 46 of the 77 locations from MapCam images. Principal component analysis indicates at least two trends: (i) mixing of Bennu's average spectrum with a strong 1-µm band absorption, possibly from pyroxene-rich material, and (ii) mixing with a weak 1-µm band absorption. The endmember with a strong 1-µm feature is consistent with Howardite-Eucrite-Diogenite (HED) meteorites, whereas the one showing a weak 1-µm feature may be consistent with HEDs, ordinary chondrites, or carbonaceous chondrites. The variation in the few available near-infrared reflectance spectra strongly suggests varying compositions among the exogenic materials. Thus, Bennu might record the remnants of multiple impacts with different compositions to its parent body, which could have happened in the very early history of the Solar System. Moreover, at least one of the exogenic objects is compositionally different from the exogenic materials found on the similar asteroid (162173) Ryugu, and they suggest different impact tracks.

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