Sulfide‐rich metallic impact melts from chondritic parent bodies |
| |
| Authors: | Devin L SCHRADER Dante S LAURETTA Harold C CONNOLLY jr Yulia S GOREVA Dolores H HILL Ken J DOMANIK Eve L BERGER Hexiong YANG Robert T DOWNS |
| |
| Institution: | 1. Lunar and Planetary Laboratory, The University of Arizona, Tucson, Arizona 85721, USA;2. Department of Physical Sciences, Kingsborough Community College of the City University of New York, 2001 Oriental Blvd., Brooklyn, New York 100235, USA;3. Department of Earth and Planetary Sciences, American Museum of Natural History, Central Park West, New York, New York 110024, USA;4. Department of Geosciences, The University of Arizona, Tucson, Arizona 85721, USA |
| |
| Abstract: | Abstract– Sacramento Wash 005 (SaW) 005, Meteorite Hills 00428 (MET) 00428, and Mount Howe 88403 (HOW) 88403 are S‐rich Fe,Ni‐rich metal meteorites with fine metal structures and homogeneous troilite. We compare them with the H‐metal meteorite, Lewis Cliff 88432. Phase diagram analyses suggest that SaW 005, MET 00428, and HOW 88403 were liquids at temperatures above 1350 °C. Tridymite in HOW 88403 constrains formation to a high‐temperature and low‐pressure environment. The morphology of their metal‐troilite structures may suggest that MET 00428 cooled the slowest, SaW 005 cooled faster, and HOW 88403 cooled the quickest. SaW 005 and MET 00428 contain H‐chondrite like silicates, and SaW 005 contains a chondrule‐bearing inclusion that is texturally and compositionally similar to H4 chondrites. The compositional and morphological similarities of SaW 005 and MET 00428 suggest that they are likely the result of impact processing on the H‐chondrite parent body. SaW 005 and MET 00428 are the first recognized iron‐ and sulfide‐rich meteorites, which formed by impact on the H‐chondrite parent body, which are distinct from the IIE‐iron meteorite group. The morphological and chemical differences of HOW 88403 suggest that it is not from the H‐chondrite body, although it likely formed during an impact on a chondritic parent body. |
| |
| Keywords: | |
|
|
