Data Report: Geochemical Well Logs through Cenozoic and Mesozoic Sediments from Sites 800, 801, and 802

Abstract

Geochemical well logs were obtained in sediment at Sites 800, 801, and 802 of Ocean Drilling Program Leg 129. Corrections have been applied to the logs to account for variations in hole size, drilling-fluid composition, and drill-pipe attenuation. Oxide and calcium carbonate weight percentages have been calculated from the processed logs and are compared with the available measurements of core. Log-derived CaCO 3 measurements correlate well with shipboard CaCO 3 core measurements from Holes 800A and 802A. Log measurements are compared with X-ray fluorescence measurements from Holes 800A and 801B. Because of selective sampling from silica-rich beds, discrepancies between log and core data occur. The silica logs show values higher overall than those of the core measurements; the aluminum logs show values lower overall.

Combined 238U–230Th and 235U–231Pa constraints on the transport of slab-derived material beneath the Mariana Islands

“…The same approach can be adopted for the Mariana arc using the U and Th log data reported for all ODP Leg 129 sites (Fig. 2, Pratson et al, 1992). Given the relatively limited set of bulk sample analyses on the Leg 129 volcaniclastics and the likely variability of U, in Table 2 End-members used for estimating the composition of the modified source of Mariana arc lavas.…”

Izu-Mariana Margin

“…4). The sediment input is fairly well constrained by previous coring during Leg 129 (Sites 800-802), and by the extensive chemical analyses of the recovered material (Karl et al, 1992;Lees et al, 1992;France-Lanord et al, 1992) as well as the geochemical logs for the different holes (Pratson et al, 1992;Fisher et al, 1992 Peacock (1990), alteration studies of DSDP Hole 504B (Leg 69; Alt et al, 1986) and DSDP Sites 417/418 (Legs 51, 52, and 53; Staudigel et al, 1995), and assuming 10% interpillow material in Hole 801C (Castillo et al, 1992b). These estimates show that the alteration fluxes may be large, but are poorly known.…”