[meteorite-list] Free Nickel-Iron In Lunar Breccias
From: Bernd Pauli HD <bernd.pauli_at_meteoritecentral.com>
Date: Thu Apr 22 09:48:13 2004 Message-ID: <3BD7C457.587A19D3_at_lehrer1.rz.uni-karlsruhe.de> Mark Fox wrote: > With ... the long impact history of our scarred moon, > wouldn't it be possible for some malleable, nickel-iron > metal to be observed in lunar breccias from the impact > of an iron or nickel-iron rich meteorite? Hello Mark, Listees, and Listoids, According to the Met. Bull. 81, 1997, p. A159, the DaG 262 polymict anorthositic lunar highland breccia is said to contain metal particles (5-26 wt% Ni) wthin the fine-grained matrix of the breccia and within the shock veins. The accessory minerals of Dhofar 025, an anorthositic regolith breccia, are silica, Ti-rich alumochromite, troilite, and FeNi metal (Met.Bull. 84, 2000 August). The accessory minerals of Dhofar 026, an anorthositic crystalline melt breccia, are silica, ilmenite (MgO = 7 wt%), troilite, and FeNi metal (Met.Bull. 84, 2000 August). > ... has such an nickel-iron occurrence ever been recorded > in any of the moon rocks recovered during the Apollo or > Luna missions? The accessory minerals of Dhofar 081 (and Dhofar 280 - they are probably paired), a feldspathic fragmental (polymict clastic) breccia, are Fe-Ni metal, ilmenite, and Ti-Cr-rich spinel (Met.Bull. 85, Sep 2001). Dhofar 287, a low-Ti, olivine-pyroxene mare basalt breccia, also contains FeNi metal (Met.Bull. 85). BECKER R.H. et al. (1994) Solar Wind Noble Gases and Nitrogen in Metal from Lunar Soil 68501 (Meteoritics 29-5, 1994, 724): The authors describe spherical meteoritic metal grains, which are presumed to be droplets formed from impact-produced melts. Best wishes, Bernd Received on Thu 25 Oct 2001 03:50:47 AM PDT |
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