Rock weathering in blockfields: Some preliminary data from mountain plateaus in North Norway

W. Brian Whalley*, Brice R. Rea, Michelle M. Rainey, John J. McAlister

*Corresponding author for this work

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

The formation of blockfields is a process usually attributed to weathering. In mountain areas this is generally assumed to be mechanical weathering (frost shattering). Evidence from two high plateaus [900 and 1350 m above sea level (a.s.l.)] in North Norway (c. 70° N) suggests that chemical action is at least as important as mechanical activity in blockfield formation. The bedrock in both areas consists of complex banded gabbros. Blockfields circumscribe ice masses and are generally > 1 m thick. They contain high percentages of material in the silt and clay sized fractions, including a variety of clay minerals: gibbsite, chlorite, of these weathering products suggests both a considerable (pre-Pleistocene) length of time required for development as well as warmer conditions than are found now (mean annual air temperature c. 0°C) or in the period since deglaciation. It is suggested that these blockfields represent a preglacial palaeosurface which formed initially under warmer conditions and has survived, largely intact, beneath all the Pleistocene ice sheets.

Original languageEnglish
Pages (from-to)133-145
Number of pages13
JournalGeological Society Special Publications
Volume120
DOIs
Publication statusPublished - 1 Dec 1997

Fingerprint

Weathering
weathering
Rocks
plateau
mountain
Ice
Pleistocene
rock
paleosurface
gibbsite
Silt
Sea level
Clay minerals
deglaciation
frost
chlorite
ice sheet
clay mineral
bedrock
silt

ASJC Scopus subject areas

  • Ocean Engineering
  • Water Science and Technology
  • Geology

Cite this

Rock weathering in blockfields : Some preliminary data from mountain plateaus in North Norway. / Whalley, W. Brian; Rea, Brice R.; Rainey, Michelle M.; McAlister, John J.

In: Geological Society Special Publications , Vol. 120, 01.12.1997, p. 133-145.

Research output: Contribution to journalArticle

Whalley, W. Brian ; Rea, Brice R. ; Rainey, Michelle M. ; McAlister, John J. / Rock weathering in blockfields : Some preliminary data from mountain plateaus in North Norway. In: Geological Society Special Publications . 1997 ; Vol. 120. pp. 133-145.
@article{0701aedb14ae440e88dd7bf7a180c9b0,
title = "Rock weathering in blockfields: Some preliminary data from mountain plateaus in North Norway",
abstract = "The formation of blockfields is a process usually attributed to weathering. In mountain areas this is generally assumed to be mechanical weathering (frost shattering). Evidence from two high plateaus [900 and 1350 m above sea level (a.s.l.)] in North Norway (c. 70° N) suggests that chemical action is at least as important as mechanical activity in blockfield formation. The bedrock in both areas consists of complex banded gabbros. Blockfields circumscribe ice masses and are generally > 1 m thick. They contain high percentages of material in the silt and clay sized fractions, including a variety of clay minerals: gibbsite, chlorite, of these weathering products suggests both a considerable (pre-Pleistocene) length of time required for development as well as warmer conditions than are found now (mean annual air temperature c. 0°C) or in the period since deglaciation. It is suggested that these blockfields represent a preglacial palaeosurface which formed initially under warmer conditions and has survived, largely intact, beneath all the Pleistocene ice sheets.",
author = "Whalley, {W. Brian} and Rea, {Brice R.} and Rainey, {Michelle M.} and McAlister, {John J.}",
year = "1997",
month = "12",
day = "1",
doi = "10.1144/GSL.SP.1997.120.01.09",
language = "English",
volume = "120",
pages = "133--145",
journal = "Geological Society Special Publications",
issn = "0305-8719",
publisher = "Geological Society of London",

}

TY - JOUR

T1 - Rock weathering in blockfields

T2 - Some preliminary data from mountain plateaus in North Norway

AU - Whalley, W. Brian

AU - Rea, Brice R.

AU - Rainey, Michelle M.

AU - McAlister, John J.

PY - 1997/12/1

Y1 - 1997/12/1

N2 - The formation of blockfields is a process usually attributed to weathering. In mountain areas this is generally assumed to be mechanical weathering (frost shattering). Evidence from two high plateaus [900 and 1350 m above sea level (a.s.l.)] in North Norway (c. 70° N) suggests that chemical action is at least as important as mechanical activity in blockfield formation. The bedrock in both areas consists of complex banded gabbros. Blockfields circumscribe ice masses and are generally > 1 m thick. They contain high percentages of material in the silt and clay sized fractions, including a variety of clay minerals: gibbsite, chlorite, of these weathering products suggests both a considerable (pre-Pleistocene) length of time required for development as well as warmer conditions than are found now (mean annual air temperature c. 0°C) or in the period since deglaciation. It is suggested that these blockfields represent a preglacial palaeosurface which formed initially under warmer conditions and has survived, largely intact, beneath all the Pleistocene ice sheets.

AB - The formation of blockfields is a process usually attributed to weathering. In mountain areas this is generally assumed to be mechanical weathering (frost shattering). Evidence from two high plateaus [900 and 1350 m above sea level (a.s.l.)] in North Norway (c. 70° N) suggests that chemical action is at least as important as mechanical activity in blockfield formation. The bedrock in both areas consists of complex banded gabbros. Blockfields circumscribe ice masses and are generally > 1 m thick. They contain high percentages of material in the silt and clay sized fractions, including a variety of clay minerals: gibbsite, chlorite, of these weathering products suggests both a considerable (pre-Pleistocene) length of time required for development as well as warmer conditions than are found now (mean annual air temperature c. 0°C) or in the period since deglaciation. It is suggested that these blockfields represent a preglacial palaeosurface which formed initially under warmer conditions and has survived, largely intact, beneath all the Pleistocene ice sheets.

UR - http://www.scopus.com/inward/record.url?scp=5244284435&partnerID=8YFLogxK

U2 - 10.1144/GSL.SP.1997.120.01.09

DO - 10.1144/GSL.SP.1997.120.01.09

M3 - Article

AN - SCOPUS:5244284435

VL - 120

SP - 133

EP - 145

JO - Geological Society Special Publications

JF - Geological Society Special Publications

SN - 0305-8719

ER -