[meteorite-list] CRE ages of Nakhlites and NWA 998

From: Gerald Flaherty <grf2_at_meteoritecentral.com>
Date: Sat Nov 11 17:42:51 2006
Message-ID: <01cd01c705e2$aeba2110$6402a8c0_at_Dell>

Thanks Bob and Walter. I knew it I was just testing[YEA RIGHT!]
Jerry Flaherty
----- Original Message -----
From: "Walter Branch" <waltbranch_at_bellsouth.net>
To: "Gerald Flaherty" <grf2_at_verizon.net>; "Meteorite List"
<meteorite-list_at_meteoritecentral.com>
Sent: Saturday, November 11, 2006 2:18 PM
Subject: Re: [meteorite-list] CRE ages of Nakhlites and NWA 998


> Hi Jerry,
>
> CRE = Cosmic Ray Exposure age. An estimate of the time the rock has been
> in space.
>
> -Walter
> ________________________
> ----- Original Message -----
> From: "Gerald Flaherty" <grf2_at_verizon.net>
> To: "Walter Branch" <waltbranch_at_bellsouth.net>; "Meteorite List"
> <meteorite-list_at_meteoritecentral.com>
> Sent: Saturday, November 11, 2006 2:03 PM
> Subject: Re: [meteorite-list] CRE ages of Nakhlites and NWA 998
>
>
>> Help! CRE age??
>> Jerry Flaherty
>> ----- Original Message -----
>> From: "Walter Branch" <waltbranch_at_bellsouth.net>
>> To: "Meteorite List" <meteorite-list_at_meteoritecentral.com>
>> Sent: Saturday, November 11, 2006 3:15 AM
>> Subject: [meteorite-list] CRE ages of Nakhlites and NWA 998
>>
>>
>>> Hello Everyone,
>>>
>>> I have been studying nakhlites in general and martian meteorite NWA 998
>>> in particular. This paper,
>>> http://www-curator.jsc.nasa.gov/antmet/mmc/XXV_NWA998.pdf
>>>
>>> quotes a CRE of 9.3 m.y. using 38Ar. This paper
>>>
>>> http://www.lpi.usra.edu/meetings/lpsc2005/pdf/1137.pdf
>>>
>>> quotes a CRE age of 9.4 m.y, again using 38Ar. However, the paper
>>> further points out CRE ages using 3He and 21Ne are in better agreement
>>> (12.2 and 11.7 m.y., respectively) and are in agreement with other
>>> nakhlite CRE ages. The authors state, "All nakhlite CRE ages based on Ar
>>> are significant (sic) younger than those based on He and Ne, an
>>> unexplained characteristic also observed among some shergotite CRE
>>> ages."
>>>
>>> Does anyone know why this is?
>>>
>>> -Walter Branch
>>>
>>> ________________________
>>>
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>>
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>
>
Received on Sat 11 Nov 2006 05:42:34 PM PST