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IODP Expedition 330 Louisville Seamount Trail

Daily Science Report 18 -- Wednesday, 29 December 2010


Site U1372 on 26.5°S Guyot 26° 29' 35.9988" S, 174° 43' 45.0012" W
Louisville Seamount Trail
0 m above sea level

The retrieved material and percentage of recovery of today’s Cores U1372A-36R (223.4-228.2 mbsf), -37R (228.2-228.9 mbsf), and -38R (228.9-232.9 mbsf) of 5%, 129% and 85% respectively show the transition from the thick pile of hyaloclastites into lava flows again. To the delight of everyone; Core U1372A-37R retrieved the upper part and -38R the central part of a dense lava flow unit containing abundant olivine phenocrysts. Whereas the olivines in the upper part of the flow are completely altered and transformed to secondary minerals, all olivines in the central part of the flow (Sections U1372A-38R-1 to -3) are fresh. Unfortunately the hole conditions deteriorated in the afternoon (probably due to material falling in from the crumbly and clast-rich hyaloclastic material between ~170 and 230 mbsf). Despite great effort to clear the hole, the drill pipe got stuck shortly before midnight.