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Lacasse, Christian; van den Bogaard, Paul (2002): Silicic tephras in ODP Legs 151, 152, and 162. PANGAEA, https://doi.org/10.1594/PANGAEA.713309, Supplement to: Lacasse, C; van den Bogaard, P (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. Geology, 30(7), 623-626, https://doi.org/10.1130/0091-7613(2002)030%3C0623:EADOST%3E2.0.CO;2

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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 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).
Project(s):
Coverage:
Median Latitude: 65.988809 * Median Longitude: -16.600651 * South-bound Latitude: 60.403300 * West-bound Longitude: -37.460300 * North-bound Latitude: 69.249800 * East-bound Longitude: -6.450000
Date/Time Start: 1993-08-05T12:48:00 * Date/Time End: 1995-08-07T19:15:00
Event(s):
151-907A * Latitude: 69.249800 * Longitude: -12.698200 * Date/Time Start: 1993-08-05T12:48:00 * Date/Time End: 1993-08-08T03:53:00 * Elevation: -1812.0 m * Penetration: 224.1 m * Recovery: 229.98 m * Location: Iceland Sea * Campaign: Leg151 * Basis: Joides Resolution * Device: Drilling/drill rig (DRILL) * Comment: 26 cores; 224.1 m cored; 0 m drilled; 102.6 % recovery
152-919A * Latitude: 62.670000 * Longitude: -37.460200 * Date/Time Start: 1993-11-13T09:14:00 * Date/Time End: 1993-11-14T05:45:00 * Elevation: -2088.0 m * Penetration: 93.5 m * Recovery: 93.59 m * Location: Greenland Sea * Campaign: Leg152 * Basis: Joides Resolution * Device: Drilling/drill rig (DRILL) * Comment: 10 cores; 93.5 m cored; 0 m drilled; 100.1 % recovery
152-919B * Latitude: 62.670000 * Longitude: -37.460300 * Date/Time Start: 1993-11-14T05:45:00 * Date/Time End: 1993-11-14T18:40:00 * Elevation: -2086.0 m * Penetration: 147 m * Recovery: 77.28 m * Location: Greenland Sea * Campaign: Leg152 * Basis: Joides Resolution * Device: Drilling/drill rig (DRILL) * Comment: 8 cores; 75.7 m cored; 0 m drilled; 102.1 % recovery
Size:
6 datasets

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