Chemical composition of the surface of ferromanganese stained granules to cobbles recovered off Newfoundland, North Atlantic Ocean ...

• Main Author: Carter, Lionel
• Format: Dataset
• Language: English
• Published: PANGAEA 1979
• Subjects: Event label; Latitude of event; Longitude of event; Elevation of event; Method/Device of event; Identification; DEPTH, sediment/rock; Iron; Manganese; Cobalt; Copper; Nickel; Deposit type; Color code HLS-system; Substrate type; Gravity corer; Grab; ICP-AES, Inductively coupled plasma - atomic emission spectroscopy; Munsell Color System 1994; DW77-034; Dawson; NOAA and MMS Marine Minerals Geochemical Database NOAA-MMS; Arctic; Newfoundland; North Atlantic
• Online Access: https://dx.doi.org/10.1594/pangaea.883751; https://doi.pangaea.de/10.1594/PANGAEA.883751

The continental slope and rise, east of Newfoundland, accommodates two distinct gravel populations. The upper slope (300-700 m depth) population is characterized by unstained, granules to boulders of predominantly granitic and terrigenous sedimentary compositon that show affinity to Paleozoic and Proterozoic rocks of Newfoundland and areas further north. The rise (2,500->3,000 m depth) population consists of iron- and ferromanganese-stained granules to cobbles composed mainly of carbonate that presumably has been derived from the high Canadian Arctic. The rise clasts are further distinguished in that they are finer grained, slightly more rounded and more altered by solution and/or boring organisms than their shallower water counterparts. The upper slope gravel has been reworked from underlying sediments, and deposited from ice rafts, and both processes are probably continuing today. Gravel on the rise has been concentrated through winnowing of middle Holocene sediments by the Western Boundary Undercurrent ... : 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1989 NOAA-NCEI compiled the NOAA-MMS Marine Minerals Geochemical Database from journal articles, technical reports and unpublished sources from other institutions.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. ...