(Plate 3) Manganese nodules and deep-sea sediment core from Pacific Ocean ...

• Main Author: Nayudu, Y Rammohanroy
• Format: Dataset
• Language: English
• Published: PANGAEA 1964
• Subjects: Event label; Date/Time of event; Latitude of event; Longitude of event; Elevation of event; Sample ID; DEPTH, sediment/rock; Sample code/label; Description; Uniform resource locator/link to image; Gravity corer; Dredge; Dredge, chain bag; Wired profile sonde; CHINOOK; DOWNWIND-H; FANFARE-B; Northern_Holiday; Spencer F. Baird; Horizon; NOAA and MMS Marine Minerals Geochemical Database NOAA-MMS; Iceland
• Online Access: https://dx.doi.org/10.1594/pangaea.856785; https://doi.pangaea.de/10.1594/PANGAEA.856785

A synoptic review of the studies of well-known occurrences of palagonite tuffs is presented. Included are palagonite tuffs from Iceland, and pillow-lava palagonite complexes from Columbia River basalts and from the central Oregon coast. Additional petrologic and x-ray defraction data for selected samples are presented. Petrologic evidence shows that basaltic glass of aqueous tuffs and breccias consists of sideromelane, which is susceptible to palagonitization. It is shown that palagonitization is a selective alteration process, involving hydration, oxidation and zeolitization. Some of the manganese nodules dredged from the Pacific Ocean floor contain nucleus of palagonite-tuff breccias or of zeolite. A brief megascopic and microscopic description of nodules from the south Pacific, the Mendocino ridge and the 'Horizon' Nodule from the north Pacific is presented. Petrographic studies of palagonite-tuff breccias of manganese nodules and other palagonites suggest that migration and segregation of metallic ... : From 1983 until 1989 NOAA-NCEI compiled the NOAA-MMS Marine Minerals Geochemical Database from journal articles, technical reports and unpublished sources from other institutions. At the time it was the most extended data compilation on ferromanganese deposits world wide. Initially published in a proprietary format incompatible with present day standards it was jointly decided by AWI and NOAA to transcribe this legacy data into PANGAEA. This transfer is augmented by a careful checking of the original sources when available and the encoding of ancillary information (sample description, method of analysis...) not present in the NOAA-MMS database. ...