Ice Core Logging

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Brittle Ice Handling Procedure

Core Push Out Procedure

  1. Position green netting on end of FED (Fluid Evacuation Device, a vacuum that encircles the core)
  2. Tie knot in end of green netting
  3. Carry core barrel to push out table (2 people)
    • Beware of fluid
  4. Position top of core barrel against FED
  5. Turn FED on
    • Make sure vacuum gate is out
  6. Slide moving tray against FED exit
  7. Push core slowly through FED into green netting and onto moving tray
  8. Turn FED off
  9. Tie knot in end green netting
  10. Wipe core of fluid to extent possible
    • rotate, wipe, repeat
  11. Measure overall length to 0.5 cm
    • Top long, bottom short
  12. Report length to drillers
  13. Record length in notes section of core card
  14. Record top depth on core card of top tube
  15. Record bottom depth (top depth + core length) on core card of bottom tube
  16. Label Tyvek tag with Tube number and “top”
  17. Attach Tyvek tag to green netting at top of core
  18. Label Tyvek tag with Tube number (increased by one from top tag) and “bottom”
  19. Attach Tyvek tag to green netting at bottom of core
  20. Push core into two-meter storage tubes
  21. Label storage tube with “SP14” and an up arrow
  22. Two people carry storage tube to core storage area


Logging Procedure

  1. Piece together previous overrun with newly drilled section
  2. Measure and make new Dumbbell mark within 10cm of the bottom of run Dumbbell mark
  3. Record Dumbbell length on core card
  4. Measure 1 m from top of overrun (the previous meter mark)
  5. Mark with a cut line and triangle pointing up Cut line and triangle
  6. Measure 1 m from cut line
    • IF meter mark is within 8cm of the run break, see below, otherwise
  7. Mark with a cut line and triangle pointing up Cut line and triangle
  8. Write tube number at top of core
  9. Add small up arrow next to core number
  10. Draw lines across any breaks to allow for easy alignment after shipping
  11. Fill out core card (see description below)
  1. Cut first core on cut line
  2. Bag first core
  3. Finish filling out core card and notebook
  4. Pack core in tube
  5. Place in storage

IF second core is not the overrun:

  1. Cut second core on cut line
  2. Bag second core
  3. Finish filling out core card and notebook
  4. Pack core in tube
  5. Place tube in storage
  6. Make sure to leave overrun piece to match with next drill run

Exception for run breaks falling within 8cm of 1m cut marks

  1. Core tubes can handle up to 1.08m core
  2. We want to minimize cuts to the core

IF run break is between 92cm and 108cm from previous cut mark, there is no need to cut.

  1. Place a short horizontal line at the 1m distance labeled with the depth but do not draw a cut mark

Things to record on core card

<Insert Core card>

Core Quality[brittle 1]
Excellent 0-1 breaks / no fractures
Very Good 0-2 breaks / 90% no fractures
Good 0-3 breaks / 50% no fractures
Fair >10 cm without fractures
Poor >10cm without through fractures
Rubble <10cm without through fractures


Format for recording breaks, gaps, and chips. This will not be done for brittle ice.

Code Description
B .XX means a break at .XX on the current piece. B .XX should be used if the break is perpendicular to the core’s (original, in-the-ice-sheet) vertical axis.
.XX DB .XX means a diagonal break from .XX to .XX on the current piece. B .XX should be used if the break is perpendicular to the core’s (original, in-the-ice-sheet) vertical axis.
.XX G .XX means a gap from .XX to .XX on the current piece.
.XX SC .XX means small chips from .XX to .XX on the current meter of core. Small chips are chips that occupy less than 30% of the thickness of the piece.
.XX LC .XX means large chips from .XX to .XX on the current meter. Large chips are chips that occupy more than 30% of the thickness of the piece.


Notes

  1. Assessing core quality is inexact. Don’t get bogged down.

Bubbly Ductile Handling Procedure

Core Push Out Procedure

  1. Carry core barrel to push out table (2 people)
    • Beware of fluid
  2. Position top of core barrel against FED (Fluid Evacuation Device, a vacuum that encircles the core)
  3. Turn FED on
    • Make sure vacuum gate is out
  4. Slide moving tray against FED exit
  5. Push core slowly through FED onto moving tray
  6. Turn FED off
  7. Wipe core of fluid
    • rotate, wipe, repeat
  8. Measure overall length to 0.5 cm
    • Top long, bottom short
  9. Report length to drillers
  10. Place temperature sensor on core

Logging Procedure

  1. Piece together previous overrun with newly drilled section
  2. Measure and make new Dumbbell mark within 10cm of the bottom of run Dumbbell mark
  3. Record Dumbbell length on core card
  4. Measure 1 m from top of overrun (the previous meter mark)
  5. Mark with a cut line and triangle pointing up Cut line and triangle
  6. Measure 1 m from cut line
    • IF meter mark is within 8cm of the run break, see below, otherwise
  7. Mark with a cut line and triangle pointing up Cut line and triangle
  8. Write tube number at top of core
  9. Add small up arrow next to core number
  10. Draw lines across any breaks to allow for easy alignment after shipping
  11. Fill out core card (see description below)
  1. Cut first core on cut line
  2. Bag first core
  3. Finish filling out core card and notebook
  4. Pack core in tube
  5. Place in storage

IF second core is not the overrun:

  1. Cut second core on cut line
  2. Bag second core
  3. Finish filling out both core cards
  4. Label tube with “SP14”, an up arrow, and tube number
  5. Pack core in tube
  6. Place 1 core card in tube
  7. Place tube in storage
  8. Make sure to leave overrun piece to match with next drill run

Exception for run breaks falling within 8cm of 1m cut marks

  1. Core tubes can handle up to 1.08m core
  2. We want to minimize cuts to the core

IF run break is between 92cm and 108cm from previous cut mark, there is no need to cut.

  1. Place a short horizontal line at the 1m distance labeled with the depth but do not draw a cut mark

Things to record on core card

<Insert Core card>

Core Quality[bubbly 1]
Excellent 0-1 breaks / no fractures
Very Good 0-2 breaks / 90% no fractures
Good 0-3 breaks / 50% no fractures
Fair >10 cm without fractures
Poor >10cm without through fractures
Rubble <10cm without through fractures

Format for recording breaks, gaps, and chips. This will not be done for brittle ice.

Code Description
B .XX means a break at .XX on the current piece. B .XX should be used if the break is perpendicular to the core’s (original, in-the-ice-sheet) vertical axis.
.XX DB .XX means a diagonal break from .XX to .XX on the current piece. B .XX should be used if the break is perpendicular to the core’s (original, in-the-ice-sheet) vertical axis.
.XX G .XX means a gap from .XX to .XX on the current piece.
.XX SC .XX means small chips from .XX to .XX on the current meter of core. Small chips are chips that occupy less than 30% of the thickness of the piece.
.XX LC .XX means large chips from .XX to .XX on the current meter. Large chips are chips that occupy more than 30% of the thickness of the piece.


Notes

  1. Assessing core quality is inexact. Don’t get bogged down.