Reclassification of four aubrites as enstatite chondrite impact melts: Potential geochemical analogs for Mercury

2019 ◽  
Vol 54 (4) ◽  
pp. 785-810 ◽  
Author(s):  
Arya Udry ◽  
Zoë E. Wilbur ◽  
Rachel R. Rahib ◽  
Francis M. McCubbin ◽  
Kathleen E. Vander Kaaden ◽  
...  
Keyword(s):  
Enstatite Chondrite ◽  
Impact Melts

The Projectile of the Lappajärvi Impact Crater

1980 ◽  
Vol 35 (2) ◽  
pp. 197-203 ◽  
Author(s):  
Elke Göbel ◽  
Uwe Reimold ◽  
Hildegard Baddenhausen ◽  
Herbert Palme
Keyword(s):  
Impact Crater ◽  
Carbonaceous Chondrite ◽  
Volatile Elements ◽  
Rich Phase ◽  
Impact Melt ◽  
Siderophile Elements ◽  
High Concentrations ◽  
Impact Melts

Abstract Two impact melt samples from the Lappajärvi crater (Scandinavia) are highly enriched in siderophile elements, such as Ir, Re, and Os. This indicates the presence of a meteoritic component. The simultaneous enrichments of Ni, Co, Cr, and Se suggest a chondritic projectile. Because of the relatively large indigenous contributions to Ni, Co, and Cr, it is not possible to distinguish between a normal and a carbonaceous chondrite. The high concentrations of relatively volatile elements could point towards a volatile-rich projectile.The two melt samples have high Re/Ir ratios compared to chondritic ratios. Enrichment of Re relative to Ir is very unusual in terrestrial impact melts. Loss of Re, because of volatilisation under oxidizing conditions or by weathering is frequently observed.The high Re/Ir ratios and the high abundances of relatively volatile elements either indicate the presence of a volatile rich phase or they characterize a type of meteorite, which has not been sampled. Some lunar highland rocks have a pattern of meteoritic elements rather similar to that observed for the Lappajärvi meteorite.The Lappajärvi crater is, after Rocheehouart, the second European crater where a significant amount of meteoritic component has been found.A melt sample from the Lake St. Martin crater (Manitoba), did not show any enrichment in meteoritic elements.

The Kaidun meteorite: Composition and origin of inclusions in the metal of an enstatite chondrite clast

1996 ◽  
Vol 31 (5) ◽  
pp. 621-626 ◽  
Author(s):  
Andrei V. IVANOV ◽  
Glenn J. MACPHERSON ◽  
Michael E. ZOLENSKY ◽  
Nataliya N. KONONKOVA ◽  
Lyudmila F. MIGDISOVA
Keyword(s):  
Enstatite Chondrite

Silicon Isotope Evidence Against an Enstatite Chondrite Earth

Science ◽  
2012 ◽  
Vol 335 (6075) ◽  
pp. 1477-1480 ◽  
Author(s):  
C. Fitoussi ◽  
B. Bourdon
Keyword(s):  
Silicon Isotope ◽  
Isotope Evidence ◽  
Enstatite Chondrite
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