Ba, Mn, and Mg record derived from Hoeglundina elegans of sediment core SLA-9

The evolution of productivity, redox conditions, temperature, and ventilation during the deposition of an Aegean sapropel (S1) is independently constrained using bulk sediment composition and high-resolution single specimen benthic foraminiferal trace metal and stable isotope data. The occurrence of benthic foraminifer, Hoeglundina elegans (H. elegans), through a shallow water (260 m) sapropel, permits for the first time a comparison between dissolved and particulate concentrations of Ba and Mn and the construction of a Mg/Ca-based temperature record through sapropel S1. The simultaneous increase in sedimentary Ba and incorporated Ba in foraminiferal test carbonate, (Ba/Ca)H. elegans, points to a close coupling between Ba cycling and export productivity. During sapropel deposition, sedimentary Mn content ((Mn/Al)sed) is reduced, corresponding to enhanced Mn2+ mobilization from sedimentary Mn oxides under suboxic conditions. The consequently elevated dissolved Mn2+ concentrations are reflected in enhanced (Mn/Ca)H. elegans levels. The magnitude and duration of the sapropel interruption and other short-term cooling events are constrained using Mg/Ca thermometry. Based on integrating productivity and ventilation records with the temperature record, we propose a two-mode hysteresis model for sapropel formation.

Substrate rocks of Fe-Mn crusts on the IOAN and Dalmorgeologiya Guyots

Substratum of cobalt-manganese crusts penetrated by numerous deep-sea drill holes on the IOAN and Dalmorgeologiya Guyots of Magellan Seamounts in the Pacific Ocean has been studied. Rocks have been characterized, and ferromanganese manifestations developed in the substratum in different forms have been studied in detail. They are considered to be products of deposition of water fluids arising in the volcanic pedestal and unloading on the guyot's periphery when penetrating into top parts of rocks to different degree phosphatized mainly by replacement. It is demonstrated by numerous substratum relicts and remains of organisms in them.

Annotated record of the detailed examination of Mn deposits from SESAM cruise stations

The cores and dredges described at this site were taken on the SESAM cruise from 30 April until 10 June 1976 by the Muséum National d'Histoire Naturelle from the R/V Marion Dufresne. A total of 55 cores, dredges and camera stations were recovered and are available at MNHN for sampling and study.

Annotated record of the detailed examination of Mn deposits from seventh cruise of the Carnegie (1928-1929)

The Carnegie, on its seventh cruise and last cruise, collected seventy-five samples of deep-sea deposits in the southeastern and the north Pacific. This report contains an account of the general character of the deep-sea samples collected and of the distribution of the various deposit types, together with the results of chemical, mechanical, X-ray, and other types of analyses. As indicated in the text, many of the analyses were carried out in whole or in part by other investigators.