Replicate Coring

Description

Collecting a single deep ice core from a given region makes verification of the validity and spatial representativeness of key results difficult. Furthermore, scientific demand for ice samples is unevenly distributed versus depth; the inventory of existing cores is being depleted in depth intervals of high scientific interest. The ability to obtain additional volumes of samples at selected intervals, termed replicate coring, addresses these concerns and adds value to the scientific return from ice coring.

The IDP replicate coring system for the DISC Drill functions by tilting and forcing the sonde against the drill hole wall with ‘actuators’ that push against the wall upon command from the surface. This gradually deviates the drilling out of the main borehole into the side wall and eventually into the new replicate hole. The replicate coring system was constructed in 2011. The system was tested at WAIS Divide, Antarctica, during the 2011-2012 field season. No core was obtained, but using insight from that test, IDP engineers made modifications to the sonde and carried out further testing in Madison. During the 2012-2013 field season at WAIS Divide, the system produced five azimuth and depth-controlled deviations at four target depths. A total of 285 m of excellent quality replicate ice core was recovered.

At the urging of the science community, IDP engineers undertook evaluation of a less complex replicate coring method that might be applied with the Foro 1650 and Foro 3000 drills. A Replicate Coring System for 98mm Electromechanical Drill – Whipstock Conceptual Documentation report was completed, describing a more passive replicate coring approach through implementation of a whipstock device, like those used in the oil and gas industry. IDP believes this concept shows promise for successful implementation at Hercules Dome, Antarctica, with the Foro 3000 Drill.

Deep Ice Sheet Coring (DISC Drill)
Foro 1650 Drill
Foro 3000 Drill

Status

Decommissioning in progress

Equipment Details

Name Replicate Coring
Type
Type
Ice coring
Number in Inventory
Number in Inventory
1
Ice Core Diameter
Ice Core Diameter
108 mm
Ice Core Length
Ice Core Length
2.0 m
Rock Core Diameter
Rock Core Diameter
[NA]
Rock Core Length
Rock Core Length
[NA]
IDP Driller Required?
IDP Driller Required?
Yes, see Deep Ice Sheet Coring Drill for more information.
Trench Required?
Comments
Comments

See Deep Ice Sheet Coring Drill for more information.

Documents

Citation Year
Pavel Talalay, Hong J (2021) Perspectives for development of ice drilling technology: continuation of the discussion. Annals of Glaciology, 62, (84), 143-156. doi: 10.1017/aog.2020.81. https://doi.org/10.1017/aog.2020.81 2021
Mary R Albert, Kristina R Slawny, Grant Boeckmann, Chris J Gibson, Jay A Johnson, Keith Makinson, Julius Rix (2020) Recent Innovations in Drilling in Ice. Chapter 6 of Advances in Terrestrial Drilling: Ground, Ice and Underwater, Bar-Cohen and Zacny, eds., 157-220. https://www.routledge.com/Advances-in-Terrestrial-Drilling-Ground-Ice-and-Under… 2020
Kyle Zeug (2018) Replicate Coring System for 98mm Electromechanical Drill - Whipstock Conceptual Documentation. 1-16. 2018
Chris J Gibson, Jay A Johnson, Alexander J Shturmakov, Nicolai B Mortensen, Joshua J Goetz (2014) Replicate ice-coring system architecture: mechanical design. Annals of Glaciology, 55, (68), 165-172. doi: 10.3189/2014AoG68A019. https://doi.org/10.3189/2014AoG68A019 2014
Jay A Johnson, Nicolai B Mortensen, Chris J Gibson, Joshua J Goetz, Alexander J Shturmakov (2014) Replicate ice-coring system testing. Annals of Glaciology, 55, (68), 331-338. doi: 10.3189/2014AoG68A034. https://doi.org/10.3189/2014AoG68A034 2014
Nicolai B Mortensen, Joshua J Goetz, Chris J Gibson, Jay A Johnson, Alexander J Shturmakov (2014) Replicate ice-coring system architecture: electrical, electronic and software design. Annals of Glaciology, 55, (68), 156-164. doi: 10.3189/2014AoG68A014. https://doi.org/10.3189/2014AoG68A014 2014
Alexander J Shturmakov, Donald A Lebar, Charles R Bentley (2014) DISC drill and replicate coring system: a new era in deep ice drilling engineering. Annals of Glaciology, 55, (68), 189-198. doi: 10.3189/2014AoG68A017. https://doi.org/10.3189/2014AoG68A017 2014
U.S. Science Community, IDPO (2009) Replicate Ice Coring System - Science Requirements. 1-5. 2009

Photos

Project History

2012-2013 Antarctic - WAIS Divide Replicate Ice Coring

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