Figure F8. Estimation of filtering quality in Hole 735B: comparison of (A–C) oxide-rich layers effects on the declination of the total field with (D–E) oxide-rich layer indicators. The difference between the declination (dec = tdec – rot) computed from tool declination (tdec) by removing tool rotation (rot) with the theoretical value for this site (Dec = –61.5°) is plotted for the (A) lithodensity tool string (LDT) (Leg 118; red); (B) dual laterolog (DLL) (Leg 176; green); and (C) FMS-sonic (Leg 176; blue). As an intrinsic property of the formation, similar values are expected and must correlate with oxide-rich layer indicators such as formation (D) magnetic susceptibility (MS) and (E) electrical resistivity.

Figure F8. Estimation of filtering quality in Hole 735B: comparison of (A–C) oxide-rich layers effects on the declination of the total field with (D–E) oxide-rich layer indicators. The difference between the declination (dec = tdec – rot) computed from tool declination (tdec) by removing tool rotation (rot) with the theoretical value for this site (Dec = –61.5°) is plotted for the (A) lithodensity tool string (LDT) (Leg 118; red); (B) dual laterolog (DLL) (Leg 176; green); and (C) FMS-sonic (Leg 176; blue). As an intrinsic property of the formation, similar values are expected and must correlate with oxide-rich layer indicators such as formation (D) magnetic susceptibility (MS) and (E) electrical resistivity.