The University of Southampton
University of Southampton Institutional Repository

High-resolution analysis of early diagenetic effects on magnetic minerals in post-middle-Holocene continental shelf sediments from the Korea Strait

Liu, J., Zhu, R.X., Roberts, A.P., Li, S.Q. and Chang, J.-H. (2004) High-resolution analysis of early diagenetic effects on magnetic minerals in post-middle-Holocene continental shelf sediments from the Korea Strait Journal of Geophysical Research, 109, B03103. (doi:10.1029/2003JB002813).

Record type: Article

Abstract

Two studied sediment cores from the Korea Strait contain mud sequences (14 m and 32.62 m in thickness) that were deposited during the last 6,000 years. The sediments have uniform lithology and geochemical properties, however, marked down-core changes in magnetic properties suggest that diagenesis has significantly impacted the magnetic properties. An expanded view of early diagenetic reactions that affect magnetic mineral assemblages is evident in these rapidly deposited continental shelf sediments compared to deep-sea sediments. The studied sediments are divided into four descending intervals, based on magnetic property variations. Interval 1 is least affected by diagenesis and has the highest concentrations of detrital magnetite and hematite, and the lowest solid-phase sulfur contents. Interval 2 is characterized by the presence of paramagnetic pyrite and sharply decreasing magnetite and hematite concentrations, which suggest active reductive dissolution of detrital magnetic minerals. Interval 3 is marked by a progressive loss of hematite with depth, and coincides with the minimum magnetite concentration. Interval 4 has an increasing down-core enhancement of authigenic greigite, which apparently formed at depths of 3–30 m below the sediment-water interface due to arrested pyritization reactions. These results indicate delays of thousands of years for acquisition of magnetizations carried by greigite, which suggests that studies of geomagnetic field behavior from greigite-bearing continental shelf sediments should be conducted with care. Also, virtually complete destruction of detrital magnetic minerals at depth suggests that magnetic studies of rapidly deposited shelf sediments are unlikely to provide a meaningful signature associated with syn-depositional environmental processes.

Full text not available from this repository.

More information

Published date: 2004

Identifiers

Local EPrints ID: 13507
URI: http://eprints.soton.ac.uk/id/eprint/13507
ISSN: 0148-0227
PURE UUID: 11113cbf-f6f4-4fe5-8b04-0891b7059a35

Catalogue record

Date deposited: 07 Dec 2004
Last modified: 17 Jul 2017 17:02

Export record

Altmetrics

Contributors

Author: J. Liu
Author: R.X. Zhu
Author: A.P. Roberts
Author: S.Q. Li
Author: J.-H. Chang

University divisions

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×