Record Details

Neogene oceanographic variations recorded in manganese nodules from the Somali Basin

DRS at CSIR-National Institute of Oceanography

View Archive Info
 
 
Field Value
 
Title Neogene oceanographic variations recorded in manganese nodules from the Somali Basin
 
Creator Banakar, V.K.
Nair, R.R.
Tarkian, M.
Haake, B.
 
Subject ferromanganese nodules
palaeoceanography
neogene
cores
geochemistry
correlation analysis
 
Description A detailed study of a nodule from the Somali Basin datEd. by sup(230)Th sub(excess) was correlated with the paleoceanographic events recorded in Site 236 (Leg 24) Deep Sea Drilling Project (DSDP) cores. Tentative indications are that the phase of nodule accretion starting with the development of pillar structure at a depth of 20 mm in the nodule around 13 Ma coincides with increased Antarctic Bottom Water (AABW) flow and an elevated calciumcarbonate compensation depth (CCD). The Late Miocene lowering of the CCD is representEd. by the mottled zones between 8 and 18 mm in the nodule is characterisEd. by an abundant silicate component (> 20%) of aeolian origin. The Miocene/Pliocene boundary (5 Ma) occurs at a depth of about 8 mm and is representEd. by the development of pillar structure and minimum of aeolian dust (10.3%). The increased biological productivity of the Somali surface water since the Middle Miocene is demonstratEd. by the increasing C sub(org) content of the nodule (from 0.11 to 0.19%) towards its surface
 
Date 2009-05-06T10:47:09Z
2009-05-06T10:47:09Z
1993
 
Type Journal Article
 
Identifier Marine Geology, Vol.110; 393-402p.
http://drs.nio.org/drs/handle/2264/2855
 
Language en
 
Rights Copyright [1993]. All efforts have been made to respect the copyright to the best of our knowledge. Inadvertent omissions, if brought to our notice, stand for correction and withdrawal of document from this repository.
 
Publisher Elsevier