Shock compaction heating and collisional processes in the production of type 3 ordinary chondrites: Lessons from the (nearly) unique L3 chondrite melt breccia Northwest Africa 8709
Abstract
Abstract Northwest Africa (NWA) 8709 is a rare example of a type 3 ordinary chondrite melt breccia and provides critical information for the shock compaction histories of chondrites. An L3 protolith for NWA 8709 is inferred on the basis of oxygen isotope composition, elemental composition, diverse mineral chemistry, and overall texture. NWA 8709 is among the most strongly shocked type 3 chondrites known, and experienced complete melting of the matrix and partial melting of chondrules. Unmelted phases underwent FeO reduction and partial homogenization, with reduction possibly occurring by reaction of olivine and low‐Ca pyroxene with an S‐bearing gas that was produced by vaporization. Chondrules and metal grains became foliated by uniaxial compaction, and during compression, chondrules and fragments became attached to form larger clumps. This process, and possibly also melt incorporation into chondrules to cause “inflation,” may have contributed to anomalously large chondrule sizes in NWA 8709. The melt breccia character is attributed to strong shock affecting a porous precursor. Data‐model comparisons suggest that a precursor with 23% porosity that was impacted by a 3 km/s projectile could have produced the meteorite. The rarity of other type 3 ordinary chondrite melt breccias implies that the immediate precursors to such chondrites weremore »
- Authors:
-
[1];
[2];
[4];
- Department of Geology and Cascadia Meteorite Laboratory Portland State University 17 Cramer Hall, 1721 SW Broadway Portland Oregon 97201 USA
- Department of Chemistry Fordham University 441 East Fordham Road Bronx New York 10458 USA, Department of Earth and Planetary Sciences American Museum of Natural History 79th Street at Central Park West New York City New York 10024 USA
- Department of Chemistry Fordham University 441 East Fordham Road Bronx New York 10458 USA
- Vatican Observatory Vatican City V‐00120 Italy
- Center for Advanced Radiation Sources University of Chicago Argonne Illinois 60439 USA
- Planetary Sciences Research Institute The Open University Walton Hall Milton Keynes MK7 6AA UK
- Institute of Meteoritics University of New Mexico Albuquerque New Mexico 87131 USA
- Publication Date:
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1804953
- Resource Type:
- Publisher's Accepted Manuscript
- Journal Name:
- Meteoritics and Planetary Science
- Additional Journal Information:
- Journal Name: Meteoritics and Planetary Science Journal Volume: 55 Journal Issue: 9; Journal ID: ISSN 1086-9379
- Publisher:
- Wiley-Blackwell
- Country of Publication:
- United States
- Language:
- English
Citation Formats
Ruzicka, Alex M., Friedrich, Jon M., Hutson, Melinda L., Strasser, Juliette W., Macke, Robert J., Rivers, Mark L., Greenwood, Richard C., Ziegler, Karen, and Pugh, Richard N. Shock compaction heating and collisional processes in the production of type 3 ordinary chondrites: Lessons from the (nearly) unique L3 chondrite melt breccia Northwest Africa 8709. United States: N. p., 2020.
Web. doi:10.1111/maps.13567.
Ruzicka, Alex M., Friedrich, Jon M., Hutson, Melinda L., Strasser, Juliette W., Macke, Robert J., Rivers, Mark L., Greenwood, Richard C., Ziegler, Karen, & Pugh, Richard N. Shock compaction heating and collisional processes in the production of type 3 ordinary chondrites: Lessons from the (nearly) unique L3 chondrite melt breccia Northwest Africa 8709. United States. https://doi.org/10.1111/maps.13567
Ruzicka, Alex M., Friedrich, Jon M., Hutson, Melinda L., Strasser, Juliette W., Macke, Robert J., Rivers, Mark L., Greenwood, Richard C., Ziegler, Karen, and Pugh, Richard N. Sat .
"Shock compaction heating and collisional processes in the production of type 3 ordinary chondrites: Lessons from the (nearly) unique L3 chondrite melt breccia Northwest Africa 8709". United States. https://doi.org/10.1111/maps.13567.
@article{osti_1804953,
title = {Shock compaction heating and collisional processes in the production of type 3 ordinary chondrites: Lessons from the (nearly) unique L3 chondrite melt breccia Northwest Africa 8709},
author = {Ruzicka, Alex M. and Friedrich, Jon M. and Hutson, Melinda L. and Strasser, Juliette W. and Macke, Robert J. and Rivers, Mark L. and Greenwood, Richard C. and Ziegler, Karen and Pugh, Richard N.},
abstractNote = {Abstract Northwest Africa (NWA) 8709 is a rare example of a type 3 ordinary chondrite melt breccia and provides critical information for the shock compaction histories of chondrites. An L3 protolith for NWA 8709 is inferred on the basis of oxygen isotope composition, elemental composition, diverse mineral chemistry, and overall texture. NWA 8709 is among the most strongly shocked type 3 chondrites known, and experienced complete melting of the matrix and partial melting of chondrules. Unmelted phases underwent FeO reduction and partial homogenization, with reduction possibly occurring by reaction of olivine and low‐Ca pyroxene with an S‐bearing gas that was produced by vaporization. Chondrules and metal grains became foliated by uniaxial compaction, and during compression, chondrules and fragments became attached to form larger clumps. This process, and possibly also melt incorporation into chondrules to cause “inflation,” may have contributed to anomalously large chondrule sizes in NWA 8709. The melt breccia character is attributed to strong shock affecting a porous precursor. Data‐model comparisons suggest that a precursor with 23% porosity that was impacted by a 3 km/s projectile could have produced the meteorite. The rarity of other type 3 ordinary chondrite melt breccias implies that the immediate precursors to such chondrites were lower in porosity than the NWA 8709 precursor, or experienced weaker shocks. Altogether, the data imply a predominantly “quiet” dynamical environment to form most type 3 ordinary chondrites, with compaction occurring in a series of relatively weak shock events.},
doi = {10.1111/maps.13567},
journal = {Meteoritics and Planetary Science},
number = 9,
volume = 55,
place = {United States},
year = {Sat Sep 12 00:00:00 EDT 2020},
month = {Sat Sep 12 00:00:00 EDT 2020}
}
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