Proterozoic iron oxide (Cu-U-Au-REE) deposits: Further evidence of hydrothermal origins

Research Article| July 01, 1994 Proterozoic iron oxide (Cu-U-Au-REE) deposits: Further evidence of hydrothermal origins P. A. Gow; P. A. Gow 1Department of Earth Sciences, Monash University, Clayton, Victoria 3168, Australia Search for other works by this author on: GSW Google Scholar V. J. Wall; V. J. Wall 2Mount Isa Mines Exploration, P.O. Box 1042, Brisbane, Queensland 4001, Australia Search for other works by this author on: GSW Google Scholar N. H. S. Oliver; N. H. S. Oliver 3School of Applied Geology, Curtin University, Perth, Western Australia 6001, Australia Search for other works by this author on: GSW Google Scholar R. K. Valenta R. K. Valenta 1Department of Earth Sciences, Monash University, Clayton, Victoria 3168, Australia Search for other works by this author on: GSW Google Scholar Geology (1994) 22 (7): 633–636. https://doi.org/10.1130/0091-7613(1994)022<0633:PIOCUA>2.3.CO;2 Article history first online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation P. A. Gow, V. J. Wall, N. H. S. Oliver, R. K. Valenta; Proterozoic iron oxide (Cu-U-Au-REE) deposits: Further evidence of hydrothermal origins. Geology 1994;; 22 (7): 633–636. doi: https://doi.org/10.1130/0091-7613(1994)022<0633:PIOCUA>2.3.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract Variations in the structural setting and mineralogy of Proterozoic iron oxide Cu-U-Au-REE (rare earth element) deposits, particularly regarding apparent depth of formation, have resulted in models ranging from direct injection of an Fe- oxide melt to formation via hydro-thermal replacement. The Emmie Bluff Fe-oxide deposit, South Australia, is unequivocally of hydrothermal origin and exhibits overprinting relations, visible at both the meso- and microscopic scale, that strongly support a model involving two temporally distinct fluids, as previously proposed for the enormous Olympic Dam deposit. The evidence indicates that the first stage of magnetite-rich ore formation was associated with high-temperature fluids from a major mid-Proterozoic felsic intrusive event. This was followed by infiltration of lower temperature fluids that produced the hematite-rich mineralization. Whole-rock stable isotope analyses are consistent with this model and suggest that the initial fluids were magmatic, with a δ18O value of 8‰-9‰, whereas the later mineralizing fluids had lower values, 0‰- 2‰, perhaps indicative of a meteoric fluid component. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.