Vera Assis Fernandes
alternative email: [log in to unmask]
--- On Tue, 4/6/10, David A. Mucciarone <[log in to unmask]> wrote:
From: David A. Mucciarone <[log in to unmask]>
Subject: Re: [ISOGEOCHEM] Speleothem sampling
To: [log in to unmask]
Date: Tuesday, April 6, 2010, 7:37 PM
You would have to adapt extension rods to the drill bit in the same way
we drill large coral heads. You may need to pump water into the drill
system to keep it cool and to remove cuttings. At 5m you will need a core
retrieval device and a wedge to break each core loose. It's the on land
version of coral drilling.
Dave
At 04:33 AM 4/6/2010, you wrote:
It should be spelled as Pomeroy.
http://www.ascscientific.com/drills.html
On Tue, Apr 6, 2010 at 6:32 AM, Weimin Feng
<[log in to unmask]>
wrote:
Trina.
We have been using Pemoroy drill set, (sold in the US by ASC
scientific). Which is basically a good electric drill, plus a drill bit
with 1" ID and diamond tip. I imagine you can get the drill from any
local appliance store, and order the drill bit online.
However, I am not aware there is a drill bit that is 5m long,
consider the smaller ID compare to the length, it will be very difficult
to obtain core samples in good shape, direction, and will not be easy to
take the cores out from the speleothem.
Regards
On Tue, Apr 6, 2010 at 5:00 AM, Trina Bose
<[log in to unmask]>
wrote:
Well I can never take out the entire thing!! Specially because it is
in a
very narrow cave and secondly I will never get permission for
that.
sincerely
Trina Bose
Research Fellow
Indian Institute of Tropical Meteorology
Dr. Homi Bhabha Road, Pashan, Pune-411008
Ph.: 91 20 25904430
-----Original Message-----
From: Stable Isotope Geochemistry
[
mailto:[log in to unmask]] On Behalf
Of Alex Thomas
Sent: Tuesday, April 06, 2010 1:43 PM
To:
[log in to unmask]
Subject: Re: [ISOGEOCHEM] Speleothem sampling
Trina,
Wow! A 5m speleothem sounds interesting
To ensure that you get meaningful d18O measurements it is essential
that you
sample the
growth axis of the speleothem. doing this by coring the centre is
risky
because the position
of the drip may have changed leading to a complicated internal
stratigraphy.
The best way
to sample is to remove the entire speleothem form the cave and saw it
open
lengthways
with either a thin wire saw or a narrow bladed circular saw. If
the
speleothem needs to go
back into the cave you can take a slab out of the center (ensuring
you have
the growth
axis) and cement it back together.
Alex
No virus found in this incoming message.
Checked by AVG - www.avg.com
Version: 9.0.791 / Virus Database: 271.1.1/2793 - Release Date:
04/06/10
00:02:00
--
Weimin FENG Ph.D
Postdoctoral Researcher
JGB 5.328
Department of Geological Sciences
Jackson School of Geosciences
University of Texas at Austin, The
Austin, TX
[log in to unmask]
214-714-7264
http://www.weiminfeng.net
---Random quotes from GOOG
--
Weimin FENG Ph.D
Postdoctoral Researcher
JGB 5.328
Department of Geological Sciences
Jackson School of Geosciences
University of Texas at Austin, The
Austin, TX
[log in to unmask]
214-714-7264
http://www.weiminfeng.net
---Random quotes from GOOG
***********************************************************
David A. Mucciarone
Stanford University
Environmental Earth Systems Science
450 Serra Mall
Building 320, Room 118
Stanford, CA 94305-2115
650-723-0817 (O) 650-725-2199 (F)
http://pangea.stanford.edu/isotope/dam/sil_home.html
***********************************************************
|
