Sediment-magnetic signature of land-use and drought as recorded in lake sediment from south-central Minnesota, USA

Auteurs :
GEISS, C.E.
BANERJEE, S.K.
CAMILL, P.
UMBANHOWAR, C.E. JR.

Description :
Sediment magnetic properties of a short core from Sharkey Lake record the effects of Euroamerican settlement and climate change over the last 150 yr. The onset of European-style farming led to increase erosion, reflected in high values of concentration-dependent parameters such as magnetic susceptibility (k), Isothermal Remanent Magnetization (IRM), and Anhysteretic Remanent Magnetization (ARM). High organic productivity in the lake during 1920s to 1940s drought increased the authigenic component resulting in highly magnetic fine-grained sediment. The effects of dissolution and the superposition of climate and land-use signals complicate the use of recent sediments as modern analogs for sediment magnetic analyses.


Type de document :
Article de périodique

Source :
Quaternary research, issn : 0033-5894, 2004, vol. 62, n°. 2, p. 117-125, nombre de pages : 9, Collation : Illustration, Références bibliographiques : 35 ref.

Date :
2004

Editeur :
Pays édition : Etats-Unis, San Diego, CA, Elsevier