The University of Southampton
University of Southampton Institutional Repository

The alkali element and boron geochemistry of the Escanaba Trough sediment-hosted hydrothermal system

James, Rachael H., Rudnicki, Mark D. and Palmer, Martin R. (1999) The alkali element and boron geochemistry of the Escanaba Trough sediment-hosted hydrothermal system Earth and Planetary Science Letters, 171, (1), pp. 157-169. (doi:10.1016/S0012-821X(99)00140-5).

Record type: Article

Abstract

A suite of conjugate pore fluid and sediment samples were collected during Leg 169 of the ODP from within the clastic sedimentary sequences which host massive sulphides at Central Hill, Escanaba Trough (ODP Site 1038). We report the alkali element and boron, and Li and B isotope data for these samples. Relative to a reference site (Site 1037) located outside the zone of high heat flow, pore fluids from Site 1038 show a wide variation in Cl (300–800 mM), and have far higher concentrations of Li (up to 6.2 mM), B (up to 9.7 mM), Cs (up to 5.0 ?M), and Rb (up to 97 ?M). We show that the pore fluids are derived from hydrothermal circulation that has extended into the basement oceanic crust, with input of the alkali elements and B as the rising hydrothermal fluids interact geochemically with the overlying clastic sediments. There is, however, no marked depletion of these elements in the conjugate sediments, suggesting that there has been advective transport of fluids away from the primary hydrothermal reaction site. This is supported by modelling of the Li and B isotope systematics of the pore fluids, which shows that they record extensive formation of secondary minerals during cooling of the fluids from ?350 to ?20°C. Precipitation of metal-rich sulphides would have occurred prior to the formation of these minerals, thus, the pore fluid Li and B isotope data can place important constraints on the locus of sulphide deposition beneath the seafloor at Escanaba.

Full text not available from this repository.

More information

Published date: 1999
Keywords: alkali metals, boron, geochemistry, geothermal systems, Escanaba Trough
Organisations: Geochemistry, Marine Geoscience

Identifiers

Local EPrints ID: 210247
URI: http://eprints.soton.ac.uk/id/eprint/210247
ISSN: 0012-821X
PURE UUID: da2393b9-dc2b-4f8e-842f-a2bf64d5214d

Catalogue record

Date deposited: 07 Feb 2012 11:56
Last modified: 18 Jul 2017 10:45

Export record

Altmetrics

Contributors

Author: Mark D. Rudnicki

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.

×