(Table 1) Compositional variation with depth in a nodule of sediment sample RVG-10D

A detailed study of a nodule from the Somali Basin dated by 230Thexcess 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 structur...

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Bibliographic Details
Main Authors: Banakar, Virupaxa K, Nair, R R, Tarkian, M, Haake, Birgit
Format: Dataset
Language:English
Published: PANGAEA 1993
Subjects:
Carbon
organic
total
Cobalt
Copper
DISTANCE
Element analyser AAS
graphite furnace
Perkin-Elmer 5000
Element analyser CHN
Carlo Erba EA1500
FFGR
Free-fall grab
Insoluble residue
Iron
Iron/Manganese ratio
Manganese
Maximum
Minimum
Nickel
Quartz
RVG-10D
Somalia Basin
Antarctic
Pillar
Antarc*
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.759572
https://doi.org/10.1594/PANGAEA.759572
Description
Summary:A detailed study of a nodule from the Somali Basin dated by 230Thexcess 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 a minimum of aeolian dust (10.3%). The increased biological productivity of the Somali surface water since the Middle Miocene is demonstrated by the increasing Corg content of the nodule (from 0.11 to 0.19%) towards its surface.

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