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HomeMy WebLinkAboutGMC Data Report No. 145Analytical results of x-ray diffraction studies on tuff beds from core of
the following five NPRA wells-
U. S. Navy
U. S. Navy
U. S. Navy
U. S. Navy
U. S. Navy
Simpson Core Test No. 27 (167', & 309)
Simpson Core Test No. 30 (170', & 293-298')
North Simpson Test No. I (2407-2408')
Fish Creek Test No. I (825', 830', & 1646')
Umiat Test No. I (495-498', & 507-508')
Received 28 NoVember~1989 · -i' i~..
---Total ~of..2t pages in rep~. rt ~
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State of Alaska Geologic Materials Center Data Report No. 145
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TO:
FROM:
DATE:
Dr. John Reeder, ADGGS
Geological Materials Center, Fish Hatchery Road
PO Box 772116
Eagle River, Alaska 99577
RECEIVED
NOV 2
Steve Bergman PRC D3136
Arco Oil and Gas Co.
2300 Plano Pkwy.
Plano, TX 75075, 214-754-6264 (fax 754-3691)D,v
"· ~--~-.o,o{'t..'cal Su,'-ve~
19 November 1989 Eagle River
SUBJECT: NPRA core X-ray and K-Ar data
It was good to visit with you last week. First, please accept my
sincere apologies for not getting these results to you sooner. This memo
provides a summary of analytical results of x-ray diffraction and 40Ar/39Ar
geochronology studies on tuff beds from several NPRA cores from the
Simpson, North Simpson, Fish Creek, and Umiat wells. Enclosed please
find x-ray diffraction spectra on the <2 micron fraction of 10 samples of the
bentonitic mfrs. The spectra are for air dried (designated NARSA...) and
ethylene glycol solvated (designated NARSG...) samples and were generated
with a SINTAG PAD V X-ray.diffractometer (Mike Kelton, analys0 with
the' 'following .operating conditions:-45 kV, 40 mA, Cu-Ka radiation; solid
slate'crystal detector,' 1 degree/min=scan rate,-0.03 degree=step size. 'The
sample names give the well name (eg. SIMP), core number (eg. 27), and
depth or depth range (eg. 167).
Also enclosed are K-Ar analytical results (Tom Bills, analyst) on
biotite concentrates from two tuff samples (Umiat41-510.5' and Umiat4/11-
488'). These two samples were the only two for which we were able to
separate enough sufficiently pure and unaltered biotite for conventional K-
Ar work.
I thank you for your cooperation in permitting these analyses and we
look forward to future cooperative endeavors.
Sincerely. Yours,
Steven C. Bergman
Principal Research Geologist
GMC Da~ta Report-:No. '14-5
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