Shock and thermal history of Northwest Africa 4859, an annealed impact-melt breccia of LL chondrite parentage containing unusual igneous features and pentlandite

Details Shock and thermal history of Northwest Africa 4859, an annealed impact-melt breccia of LL chondrite parentage containing unusual igneous features and pentlandite Shock and thermal history of Northwest Africa 4859, an annealed impact-melt breccia of LL chondrite parentage containing unusual igneous features and pentlandite

May 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010m%26ps...45..828j&link_type=abstract

Meteoritics and Planetary Science, Volume 45, Issue 5, pp. 828-849.

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Scientific paper

Northwest Africa 4859 (NWA 4859) is a meteorite of LL chondrite parentage that shows unusual igneous features and contains widely distributed pentlandite. The most obvious unusual feature is a high proportion of large (<=3cm diameter) igneous-textured enclaves (LITEs), interpreted as shock melts that were intruded into an LL chondrite host. One such LITE appears to have been produced by whole rock melting of LL chondrite, initial rapid partial crystallization, and subsequent slow cooling of the residual melt in the host to produce a differentiated object. Other unusual features include mm-sized ``overgrowth objects,'' fine-grained plagioclase-rich bands, and coarse troilite (<=7mm across) grains. All these features are interpreted as having crystallized from melts produced by a single transient shock event, followed by slow cooling. A subsequent shock event of moderate (S3) intensity produced veining and transformed some of the pyroxene into the clinoenstatite polytype. Pentlandite (together with associated troilite) in NWA 4859 probably formed by the breakdown of a monosulfide precursor phase at low temperature (<=230°C) following the second shock event. NWA 4859 is interpreted to be an unusual impact-melt breccia that contains shock melt which crystallized in different forms at depth within the parent body.

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