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Re: Pallasites and Tatahouine
- To: meteorite-list@meteoritecentral.com
- Subject: Re: Pallasites and Tatahouine
- From: Joel Schiff <schiff@math.auckland.ac.nz>
- Date: Thu, 18 Sep 1997 08:41:06 +1200 (NZST)
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- Resent-Date: Wed, 17 Sep 1997 16:42:14 -0400 (EDT)
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At 10:32 AM 17/09/97 -0400, you wrote:
>I've been unable to solve the mystery of the three types of Pallasites -
>1)Eagle Station Trio Group, 2)Pyroxene Group, 3)Main Group. Can anyone give
>examples of each and what the differences are?
In 1977 Edward Scott proposed a division of various pallasites into groups
based on their differeing compostions of Ni, Ga, Ge, Au:
Eagle Station Group- Ni 7.8-11.7% etc: Cold Bay Eagle Station, Itzawisis.
Main Group- Ni 14-16% etc: Admire, Ahumada, Albin, Brahin, Brenham, Dora,
Esquel, Finmarkin, Giroux, Hukittta, Imilac, Krasnoyarsk, Marjalahti, Mount
Vernon, Newport, Santa Rosalia, South Bend, Thiel Mountains
Anomalous Group- Metal compositions appropriate to high Ni Main Group
members but fayalite contents are too high for Main Group: Rawlinna,
Springwater, Phillips County.
In 1995, J. Boesenberg et al. proposed a Pyroxene Pallasites- a new
Pallasite Grouplet- based on Cr, Co, Ni, Cu, Ga etc: Vermillion,
Yamato-8451. Note however, there is no visual similarity between these two.
Joel Schiff