Data Report: Geochemical Logging Results from the Lau Basin and Tonga Ridge: Sites 834, 838, 839, and 840

Abstract

Geochemical well logs were obtained through sediment at Sites 838 and 840 and through sediment and basalt at Sites 834 and 839 of Leg 135. Corrections have been applied to the logs to account for variations in borehole size, drilling-fluid composition, and drill-pipe attenuation. Concentrations of Th, U, and Gd, as well as oxide weight percentages, have been calculated from the logs. The log-derived geochemistry correlates well with shipboard CaCO^ measurements in each well. The X-ray fluorescence (XRF) measurements compare well with the geochemical log values at each of the logged sites, except in zones of alteration.