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IODP Expedition 330 Louisville Seamount Trail

Daily Science Report 28 -- Saturday, 8 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

Cores U1374A-9R (43.8-48.6 mbsf), -10R (48.6-53.4 mbsf), -11R (53.4-58.4 mbsf), -12R (58.4-68.0 mbsf), -13R (68.0-72.8 mbsf), -14R (72.8-77.6 mbsf), -15R (77.6-84.6 mbsf) and -16R (84.6-87.2 mbsf) were retrieved with an average recovery of 84%. Almost the whole recovered sequence consists of reddish, highly to completely altered volcaniclastic breccia cemented by white calcite (and minor zeolite) that fills most of the voids. Some of the larger (>5 cm) clasts are possible pillow lava fragments with altered glass rims. Downhole (Cores U1374A-14R and -15R), the basaltic intervals are getting thicker and could represent intercalated lava flows but detailed description of these cores is still underway. Core U1374A-16R recovered 2.6 m of massive dark-gray volcanic rock that has a fresh appearance but is not split and processed yet. At noon, the series of site summary meetings for previous Site U1373 continued with presentations by the Igneous Petrology, Alteration Petrology and Structural Geology lab groups.