Skip navigation

IODP Expedition 330 Louisville Seamount Trail

Daily Science Report 29 -- Sunday, 9 January 2011


Site U1374 on 28.6°S Guyot 28° 35' 44.9988" S, 173° 22' 49.8" W
Louisville Seamount Trail
0 m above sea level

Today’s Cores U1374A-17R through -23R (87.2-120.8 mbsf) continued to recover volcaniclastic breccia with 86% recovery. So far, 12 lithologically different volcanic clast types have been identified. Occasionally (e.g. in Core U1374A-21R), large bioclasts, such as complete bivalve shells, are found, providing evidence that this material has been reworked under submarine conditions. Meanwhile, the shipboard investigation of the 10 cm thick fossil-rich limestone that was recovered in Core U1374A-3R, above the first lava flow at this site, is nearly completed. The identified fossils include benthic and planktonic foraminifera, sea urchin spines, bivalve fragments and bryozones. The occurrence of double-keeled planktonic foraminifers (confined to Turonian through Maastrichtian ages) proves that volcanism at Site U1374 ceased in the late Cretaceous.