[meteorite-list] Pseudotachylite (NWA 2058)

[Adam Hupe]

Hi List,

There are no other just plain "H" chondrites other than NWA 2058 that have
been fully classified that I am aware of.  The other Hs that I found were
not fully classified so the H was just used to give type not petrologic
grade.  No subtype can be determined for NWA 2058 because the shock effects
were so intense as to blur further study.  The term pseudotachylite used to
describe this meteorite came directly from a planetary scientist who is a
world renown authority on shock effects.  This subject was addressed on the
List before.  Here are some references for interesting reading:


STÖFFLER D. et al. (1991) Proposal for a revised petrographic shock
classification of chondrites (Meteoritics 26-4, 1981, A398-A399).

BEGEMANN F. et al. (1992) On the thermal history of heavily shocked
Yanzhuang H-chondrite (Meteoritics 27-2, 1992, 174-178).

XIANDE X. et al. (1991) The new meteorite fall of Yanzhuang, a severely
shocked H6 chondrite with black molten materials (Meteoritics 26-4, 1991,
A411).
FRENCH B.M. (1998) Traces of Catastrophe (LPI Contribution 954, pp. 65-69).

RUBIN A.E. (2003) Post-shock annealing and post-annealing shock:
implications
for the thermal and shock histories of ordinary-chondrite parent bodies
(Lunar and
Planetary Science XXXIV (2003), 1263.pdf).

Kind Regards,

------------------------------------
Adam Hupe
The Hupe Collection
Team LunarRock
IMCA 2185
raremeteorites at comcast.net