Hello Rob,
Thank you for your email. Good question. Between the science done, finder's
statement and visually inspected by many people who have seen a lot of
Canyon Diablo, there is not a chance of a pairing.
Best regards,
Greg
====================
Greg Hupe
The Hupe Collection
NaturesVault (eBay)
[email protected]
www.LunarRock.com
IMCA 3163
====================
Click here for my current eBay auctions:
http://search.ebay.com/_W0QQsassZnaturesvault
----- Original Message -----
From: "Matson, Robert D." <[email protected]>
To: "Greg Hupe" <[email protected]>; <[email protected]>
Sent: Tuesday, May 26, 2009 7:49 PM
Subject: RE: NEW Ocate, NM Iron Classification
Hi Greg,
How sure is UAb that Ocate isn't paired to Canyon Diablo? Here's a
comparison of trace elements (units are mg/g for Ni & Co, micrograms/gram
for all others):
Elem. Ocate, NM Canyon Diablo Diff. Sigma
----- -------------- --------------- ----- -----
Ni 69.9 +/- 0.5 69.2 +/- 1.7 0.7 < 1
Co 0.466 +/- 0.004 0.468 +/- 0.015 0.002 << 1
Ga 71.9 +/- 0.3 83.8 +/- 3.4 11.9 3.2
Ge 271 +/- 6 322 +/- 19 51 2.0
Ir 2.25 +/- 0.04 2.17 +/- 0.07 0.08 < 1
Au 1.60 +/- 0.03 1.57 +/- 0.11 0.03 << 1
As 15.2 +/- 0.3 12.7 +/- 0.7 2.5 2.5
Cu 119 +/- 11 148 +/- 6 29 1.7
W 0.87 +/- 0.08 0.99 +/- .129 0.12 < 1
Re 0.22 +/- 0.02 0.228 +/- 0.027 0.008 << 1
The most significant differences are gallium (more than 3-sigma different)
and germanium (2-sigma). (The 2.5-sigma difference on arsenic may not be
as significant since the 1-sigma measurement error is greater than 5%;
similarly, copper's measurement uncertainty is greater than 9%.)
--Rob
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Greg
Hupe
Sent: Tuesday, May 26, 2009 3:18 PM
To: [email protected]
Subject: [meteorite-list] NEW Ocate, NM Iron Classification & Specimens -
AD
Dear List Members,
I would like to announce a newly-approved iron meteorite found in New
Mexico in 1986 and has just been approved. It is a IAB-MG (Main Group),
coarse ochtahedrite and is named "Ocate" after the nearest town to where
it was found. It will be in the online database soon and will be published
in MB96 (Sept, issue MaPS). It wasn't until 2008 that they finder
approached me with the single 6.4kg stone that the classification process
began. I went to the find site last fall with the person who found it to
take GPS coordinates, photograph the area and to hunt for more if there
were any to be found. We didn't have much time to hunt at that time so we
did not find any others.
Here are a couple of links to give you an idea of how nice Ocate is (see
all available specimens below classification below). This was cut and
prepared by one of the best meteorite craftsman in the business!
Polished and etched face of a 314g complete slice:
http://www.lunarrock.com/ocate/specimens/dsc00002.jpg
Ocate, New Mexico sign:
http://www.lunarrock.com/ocate/OcateSign.jpg
The find site of the 6.4kg Ocate iron:
http://www.lunarrock.com/ocate/findsite.jpg
Getting to the find site is treacherous and a 4-wheel drive vehicle with
high clearance is required! It took us about three hours after leaving the
paved road to get to the site up the mountain on a road that was more like
a crater-ridden trail with large boulders in most places and swampy mud in
others. To successfully hunt the site would require camping for a week,
there is no way to drive up and down the mountain each day and get enough
hunting hours in to make it worthwhile. There are also lots of elk hunters
during hunting season so anyone who wants to give it a go, be careful!
Submitted and approved classification for "Ocate":
Ocate
36° 17.72' N, 105° 2.90' W
Mora County, New Mexico
Find: 1986
Iron (IAB-MG), coarse octahedrite
History: This single 6.4kg mass was found by a local New Mexico hunter in
1986. Knowing it was different from the surrounding rocks and had an odd
appearance (the face of a bear), the hunter took it home and set it aside
with an odd assortment of 'collectibles' while hunting and mountaineering
over decades in the New Mexico area. The owner contacted G. Hupe in May
2008 for verification of the find, which was confirmed by study of the
type sample at the University of Alberta.
Physical characteristics: A single stone weighing 6402 grams with
virtually no apparent fusion crust, yet also lacking progressed
terrestrial alteration, which contributes towards its dark brown metallic
appearance with well defined regmaglypts.
Petrography: (C. Herd, N. Bruemmer, UAb) A 5 x 7 cm polished and etched
slab reveals Widmanstätten pattern with an average bandwidth of 1.4 ± 0.2
mm, few areas of plessite, and numerous inclusions. A 1 cm ellipsoidal
graphite nodule and several smaller inclusions of graphite, troilite and
schreibersite are associated with polygonal kamacite on one portion of the
slab. Smaller, mm-scale elongate inclusions of troilite are oriented
parallel to kamacite lamellae where the Widmanstätten is better developed.
Terrestrial oxides decorate fractures within a few mm of the exterior
surface.
Geochemistry: Bulk Composition: INAA data (J. Duke, UAb): Ni = 6.99 ± 0.05
wt%, Co = 0.466 ± 0.004 wt%, Ga = 71.9 ± 0.3 μg/g, Ge = 271 ± 6 μg/g, Ir =
2.25 ± 0.04 μg/g, Au = 1.60 ± 0.03 μg/g, As = 15.2 ± 0.3 μg/g, Cu = 119 ±
11 μg/g, W = 0.87 ± 0.08 μg/g, Re = 0.22 ± 0.02 μg/g (uncertainties 1s,
68% confidence level).
Classification: Iron meteorite, IAB main group, coarse octahedrite,
minimal shock, minimal weathering.
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