Composition and origin of hydrothermal ironstones from central Pacific seamounts
Geochimica et Cosmochimica Acta
- By:
- J.R. Hein , Y. Hsueh-Wen , S.H. Gunn , A.E. Gibbs , and W. Chung-ho
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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