Brittle Ice Handling Procedure

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Brittle Ice Handling Procedure

  • Core Push Out Procedure
    • Position green netting on end of FED (Fluid Evacuation Device, a vacuum that encircles the core)
    • Tie knot in end of green netting
    • Carry core barrel to push out table (2 people)
      • Beware of fluid
    • Position top of core barrel against FED
    • Turn FED on

- Make sure vacuum gate is out

    • Slide moving tray against FED exit
    • Push core slowly through FED into green netting and onto moving tray
    • Turn FED off
    • Tie knot in end green netting
    • Wipe core of fluid to extent possible

- rotate, wipe, repeat

    • Measure overall length to 0.5 cm
      • Top long, bottom short
    • Report length to drillers
    • Record length in notes section of core card
    • Record top depth on core card of top tube
    • Record bottom depth (top depth + core length) on core card of bottom tube
    • Label Tyvek tag with Tube number and “top”
    • Attach Tyvek tag to green netting at top of core
    • Label Tyvek tag with Tube number (increased by one from top tag) and “bottom”
    • Attach Tyvek tag to green netting at bottom of core
    • Push core into two-meter storage tubes
    • Label storage tube with “SP14” and an up arrow
    • Two people carry storage tube to core storage area

  • Logging Procedure
    • Piece together previous overrun with newly drilled section
    • Measure and make new Dumbbell mark within 10cm of the bottom of run
    • Record Dumbbell length on core card
    • Measure 1 m from top of overrun (the previous meter mark)
    • Mark with a cut line and triangle pointing up
    • Measure 1 m from cut line
      • IF meter mark is within 8cm of the run break, see below, otherwise
    • Mark with a cut line and triangle pointing up
    • Write tube number at top of core
    • Add small up arrow next to core number
    • Draw lines across any breaks to allow for easy alignment after shipping
    • Fill out core card (see description on following page)
    • Cut first core on cut line
    • Bag first core
    • Finish filling out core card and notebook
    • Pack core in tube
    • Place in storage
    • IF second core is not the overrun:
    • Cut second core on cut line
    • Bag second core
    • Finish filling out core card and notebook
    • Pack core in tube
    • Place tube in storage
    • Make sure to leave overrun piece to match with next drill run
  • Exception for run breaks falling within 8cm of 1m cut marks
    • Core tubes can handle up to 1.08m core
    • 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.
    • 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
    • Assessing core quality is inexact. Don’t get bogged down.
      • 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.
      • 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