Lacasse, Christian and van den Bogaard, Paul (2002): Enhanced airborne dispersal of silicic tephras during the onset of Northern Hemisphere glaciations, from 6 to 0 Ma records of explosive volcanism and climate change in the subpolar North Atlantic
Leg/Site/Hole:
Related Expeditions:
ODP 151
Identifier:
ID:
2002-060680
Type:
georefid
ID:
10.1130/0091-7613(2002)030<0623:EADOST>2.0.CO;2
Type:
doi
Creator:
Name:
Lacasse, Christian
Affiliation:
Open University, Department of Earth Sciences, Volcano Dynamics Group, Milton Keynes, United Kingdom
Role:
author
Name:
van den Bogaard, Paul
Affiliation:
GEOMAR Research Center for Marine Geosciences, Federal Republic of Germany
Role:
author
Identification:
Title:
Enhanced airborne dispersal of silicic tephras during the onset of Northern Hemisphere glaciations, from 6 to 0 Ma records of explosive volcanism and climate change in the subpolar North Atlantic
Year:
2002
Source:
Geology (Boulder)
Publisher:
Geological Society of America (GSA), Boulder, CO, United States
Volume:
30
Issue:
7
Pages:
623-626
Abstract:
A 6-m.y.-long composite marine record of explosive silicic volcanism from five Ocean Drilling Program sites in the subpolar North Atlantic was compared with several marine records of global and local paleoclimate proxies (benthic delta (super 18) O and ice-rafted debris records). Coarsening and high frequency of occurrence of Icelandic tephras were recorded in 3.6-3 Ma sediments, suggesting that these tephras were dispersed farther from the source by enhanced westerly winds over the subpolar North Atlantic. The (super 40) Ar/ (super 39) Ar ages were determined by laser probe on K-feldspar and biotite phenocrysts of tephras that were erupted from the Jan Mayen volcanic system. Compared to the tuned paleomagnetic age model, the (super 40) Ar/ (super 39) Ar dating (0.618+ or -0.007 Ma to 4.90+ or -0.05 Ma) yields a new age model that postdates by 155 k.y. the inception of ice rafting on the Iceland Plateau during the cold marine isotope stage M2 (i.e., 3.3-3.14 Ma).
Language:
English
Genre:
Serial
Rights:
URL:
Coverage: Geographic coordinates: North:69.1459 West:-37.2737 East:
-6.2700 South:60.2412
Keywords: Stratigraphy; absolute age; acidic composition; alkali feldspar; Ar/Ar; Arctic region; Atlantic Ocean; atmospheric transport; biotite; Cenozoic; climate change; cores; dates; deep-sea environment; Europe; explosive eruptions; feldspar group; framework silicates; glaciation; grain size; ice rafting; Iceland; Jan Mayen; K-feldspar; Leg 151; Leg 152; Leg 162; marine environment; marine sediments; mica group; Neogene; North Atlantic; Northern Hemisphere; Ocean Drilling Program; ODP Site 907; ODP Site 919; ODP Site 983; ODP Site 984; ODP Site 985; paleoatmosphere; paleoclimatology; paleomagnetism; Pleistocene; Pliocene; Quaternary; sediments; sheet silicates; silicates; Tertiary; volcanic ash; volcaniclastics; volcanism; Western Europe; wind transport; winds;
.