A trace element study of siderite-jasper banded iron formation in the 3.45 Ga Warrawoona Group, Pilbara Craton - Formation from hydrothermal fluids and shallow seawater

Bolhar, R, Van Kranendonk, MJ and Kamber, BS (2005) A trace element study of siderite-jasper banded iron formation in the 3.45 Ga Warrawoona Group, Pilbara Craton - Formation from hydrothermal fluids and shallow seawater. Precambrian Research, 137 1-2: 93-114. doi:10.1016/j.precamres.2005.02.001


Author Bolhar, R
Van Kranendonk, MJ
Kamber, BS
Title A trace element study of siderite-jasper banded iron formation in the 3.45 Ga Warrawoona Group, Pilbara Craton - Formation from hydrothermal fluids and shallow seawater
Journal name Precambrian Research   Check publisher's open access policy
ISSN 0301-9268
Publication date 2005
Sub-type Article (original research)
DOI 10.1016/j.precamres.2005.02.001
Volume 137
Issue 1-2
Start page 93
End page 114
Total pages 22
Place of publication Amsterdam, Netherlands
Publisher Elsevier Science BV
Collection year 2005
Language eng
Subject C1
260301 Geochronology and Isotope Geochemistry
780104 Earth sciences
Abstract Shale-normalised rare earth element and yttrium (REE + Y) patterns for siderite-jasper couples in a banded iron formation of the 3.45 Ga Panorama Formation, Warrawoona Group, eastern Pilbara Craton, display distinct positive Y and Eu anomalies and weak positive La and Gd anomalies, combined with depleted light REE relative to middle and heavy REE. Ambient seawater and hydrothermal fluids are identified as major sources of REE + Y for the BIF. In the case of siderites, strong correlations between incompatible trace elements and trace element ratios diagnostic of seawater indicate variable input from a terrigenous source (e.g. volcanic ash). We propose a volcanic caldera setting as a likely depositional environment where jasper and siderite precipitated as alternating bands in response to episodic changes in ambient water chemistry. The episodicity was either driven by fluctuations in the intensity of hydrothermal activity or changes in magma chamber activity, which in turn controlled relative sea level. In this context, precipitation of jasper probably reflects background conditions during which seawater was saturated in silica due to evaporative conditions, while siderites were deposited most likely during intermittent periods of enhanced volcanic activity when seawater was more acidic due to the release of exhalative phases (e.g. CO2). © 2005 Elsevier B.V. All rights reserved.
Keyword Geosciences, Multidisciplinary
Archaean
Banded Iron Formation
Caldera
Hydrothermal Fluids
Panorama Formation
Pilbara Granite-greenstone Terrain
Rare Earth Elements
Rare-earth-elements
Western-australia
Archean Cherts
Tectonic Significance
Transvaal Supergroup
Continental-crust
Greenstone-belt
South-africa
Chemistry
Geochemistry
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Earth Sciences Publications
2006 Higher Education Research Data Collection
 
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Created: Wed, 15 Aug 2007, 07:31:03 EST