43. GEOCHEMICAL WELL LOGS IN THE IZU-BONIN ARC-TRENCH SYSTEM, SITES 791,792, AND 7931

Geochemical well logs were obtained in sediments at Site 791 and in both sediments and basalts at Sites 792 and 793 of Leg 126. Corrections have been applied to the logs from the latter two sites to account for variations in hole size, drilling fluid interference, and drill-pipe attenuation. Oxide and calcium carbonate weight percentages have been calculated from the processed logs and are compared to the available core measurements. Log-derived CaCO3 measurements correlate well with shipboard CaCO3 core measurements from Hole 79IB. In Holes 792E and 793B the log-derived oxides, with the exception of SiO2, agree extremely well with the X-ray fluorescence measurements.