Annotated record of the detailed examination of Mn deposits in a core from R/V Hakuho Maru Cruise KH-74-4 station


Autoria(s): Tsunogai, Shizuo; Yamada, M
Cobertura

LATITUDE: 27.433333 * LONGITUDE: 137.600000 * MINIMUM DEPTH, sediment/rock: 0.03 m * MAXIMUM DEPTH, sediment/rock: 0.57 m

Data(s)

25/05/1980

Resumo

A sediment core obtained from the northeastern Philippine Sea Basin was analyzed for 232Th, 230Th, 226Ra and 210Pb. Three sheets of Ferro-manganese oxide in a matrix of red clay were included in the 73 m core. Although the concentration of 232Th of land origin is normal as compared with that of the usual red clay or of the sediment obtained at the neighboring station, the concentration of radiogenic 230Th is extremely low and does not decrease with increasing depth. The radioactivity of rather soluble 226Ra at the station is not less than that of 230Th in the surface sediment, showing a tendency different from that observed in usual cores. Some enrichment in the comparatively short-lived 210Pb activity relative to 226Ra activity was found in the top sediment and in the first ferro-manganese sheet at the station. If the excess 210Pb in the ferro-manganese sheet is not due to contamination of the surface sediment, lead should migrate through the sheet. These facts suggest that the core has not been accumulating during the past few hundred thousand years or more.

Formato

text/tab-separated-values, 24 data points

Identificador

https://doi.pangaea.de/10.1594/PANGAEA.860773

doi:10.1594/PANGAEA.860773

Idioma(s)

en

Publicador

PANGAEA

Relação

Grant, J Bruce; Moore, Carla J; Alameddin, George; Chen, Kuiying; Barton, Mark (1992): The NOAA and MMS Marine Minerals Geochemical Database. National Geophysical Data Center, NOAA, doi:10.7289/V52Z13FT

Warnken, Robin R; Virden, William T; Moore, Carla J (1992): The NOAA and MMS Marine Minerals Bibliography. National Geophysical Data Center, NOAA, doi:10.7289/V53X84KN

Direitos

CC-BY: Creative Commons Attribution 3.0 Unported

Access constraints: unrestricted

Fonte

Supplement to: Tsunogai, Shizuo; Yamada, M (1980): A radiochemically studied sediment core from the Philippine Sea Basin indicating no accumulation during the past few hundred thousand years. Geochemical Journal, 14(1), 19-26, doi:10.2343/geochemj.14.19

Palavras-Chave #Core; CORE; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Description; Hakuho-Maru; Identification; KH-74-4; KH74-4-24; NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS; Pacific Ocean; Position; Quantity of deposit; Sediment type; Type; Visual description
Tipo

Dataset