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Composition and origin of hydrothermal ironstones from central Pacific seamounts

Geochimica et Cosmochimica Acta

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, , , , and

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Abstract

Ironstones recovered from five Late Cretaceous seamounts in the central Pacific region probably formed during late-stage edifice-building volcanism. Ironstones are dense and compact with the appearance of brown chert. The ironstones are characterized by a goethite mineralogy with FeOOH contents up to 88%, extreme fractionation of Fe and Mn, low trace-element and rare earth element abundances, low Co Zn ratios, and isotopic equilibration temperatures of about 20-45 ??C. These characteristics indicate that the ironstones formed from hydrothermal fluids. Ironstones probably formed below the seawater-seafloor interface, as indicated by their occurrence as a proximal hydrothermal deposit, presence of primary goethite cement, pervasive replacement of rocks by goethite, and absence of interbedded pyro-clastic beds. ?? 1994.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Composition and origin of hydrothermal ironstones from central Pacific seamounts
Series title:
Geochimica et Cosmochimica Acta
Volume
58
Issue:
1
Year Published:
1994
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Geochimica et Cosmochimica Acta
First page:
179
Last page:
189
Number of Pages:
11