Silicic tephras in ODP Legs 151, 152, and 162

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 d18O and ice-rafted debris records). Coarsening and high frequency of...

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Bibliographic Details
Main Authors: Lacasse, Christian, van den Bogaard, Paul
Format: Dataset
Language:English
Published: PANGAEA 2002
Subjects:
151-907A
152-919A
152-919B
162-907B
162-983A
162-983C
162-984B
162-985A
162-985B
DRILL
Drilling/drill rig
Greenland Sea
Iceland Sea
Joides Resolution
Leg151
Leg152
Leg162
North Atlantic Ocean
Norwegian Sea
Ocean Drilling Program
ODP
Greenland
Iceland Plateau
Jan Mayen
Iceland
North Atlantic
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.713309
https://doi.org/10.1594/PANGAEA.713309
Description
Summary: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 d18O 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 40Ar/39Ar 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 40Ar/39Ar dating (0.618+/-0.007 Ma to 4.90+/-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).

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