Composition and origin of hydrothermal ironstones from central Pacific seamounts
Links
- More information: Publisher Index Page (via DOI)
- Download citation as: RIS | Dublin Core
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 CoZn 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.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Composition and origin of hydrothermal ironstones from central Pacific seamounts |
| Series title | Geochimica et Cosmochimica Acta |
| DOI | 10.1016/0016-7037(94)90455-3 |
| Volume | 58 |
| Issue | 1 |
| Year Published | 1994 |
| Language | English |
| Publisher | Elsevier |
| Description | 11 p. |
| First page | 179 |
| Last page | 189 |
| Country | Johnston Island, Kingman-Palmyra Island, Republic of the Marshall Islands |
| Google Analytic Metrics | Metrics page |