Buried ice in the Richardson's –Buried ice in the Richardson's –Remnant Laurentide ice or Remnant Laurentide ice or meltwater?meltwater?

Lacelle, D., 2002.Lacelle, D., 2002.Origin and preservation of buried ice in theOrigin and preservation of buried ice in theRichardson Mountains, NWT, Canada.Richardson Mountains, NWT, Canada.MSc Thesis, University of OttawaMSc Thesis, University of Ottawa..

Lacelle, D. Lauriol, B. Clark, I.D. and Bjornson, J., 2002.Lacelle, D. Lauriol, B. Clark, I.D. and Bjornson, J., 2002.In preparation, In preparation, Canadian J. Earth ScCanadian J. Earth Sc..

Bon

ne t P

lume C

reek

Will

ow R

iver

< 2 0 0 m

2 0 0 - 5 0 0 m

5 0 0 - 9 0 0 m

> 9 0 0 m

6 8 ° N

6 8 ° 5 ’ NS ite 00 -1

S ite 00 -2

S ite 00 -4

S ite 00 -3

1 3 6 ° W

Dashed line= LGM

1818O profilesO profiles

2040 ± 50 B P

50

100

150

200

250

300

350

400

450

500

550

600

8240 ± 70 BP

100

150

200

250

300

350

400

450

500

550

600

650

T h aw S lu m p 00 -4

0

50

0

T h aw S lu m p 00 -2B

-29 -28 -27

T h aw S lu m p 00 -2A

270 ± 50 B P

-29 -27

1 8O (‰ )-25

F reez in gcy c le s

M o lecu la rd iffu s io n

-23 -21

50

100

150

200

250

300

350

400

450

0

L eg en d

A ctive layer

U nit 2 : D iam icton

U nit 1 : D ebr is-r ich ice

D ista n ce (k m )

0 1 0 2 0 3 0 4 0 5 0

t1

w a te r -sa tu r a te dt ill

t2

t1t2

A g g r a d in g p e r m a fro s t

Genesis of ground iceGenesis of ground ice

Rampton, V.N., 1974.