Quick
Search: 		  
advanced search
 GSW Home   GeoRef Home   My GSW Alerts   Contact GSW   About GSW   Journals List   Help 
Geology Don't get GSW? Talk to your librarian.
JOURNAL HOME HELP CONTACT PUBLISHER SUBSCRIBE ARCHIVE SEARCH TABLE OF CONTENTS
Geology; September 2008; v. 36; no. 9; p. 719-722; DOI: 10.1130/G24920A.1
© 2008 Geological Society of America
This Article
Right arrow Figures Only
Right arrow Full Text
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Right arrow Citation Map
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Similar articles in Web of Science
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrow reprints & permissions
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via Web of Science (2)
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Chambefort, I.
Right arrow Articles by Kent, A. J.R.
Right arrow Search for Related Content
GeoRef
Right arrow GeoRef Citation

Anhydrite-bearing andesite and dacite as a source for sulfur in magmatic-hydrothermal mineral deposits

Isabelle Chambefort*,1, John H. Dilles*,1 and Adam J.R. Kent1

1 Department of Geosciences, Oregon State University, Corvallis, Oregon 97331, USA

Correspondence: *E-mails: Isabelle.Chambefort{at}utas.edu.au; dillesj{at}geo.oregonstate.edu.

Magmaticanhydritefromandesitesanddacitesoccursasinclusionsinhigh-andlow-aluminum amphibole and pyroxene and indicates that sulfate-saturated magmas spanned a period of six million years at Yanacocha, Peru. Magmatic anhydrite from Yanacocha and other sites is characterized by light rare earth element–enriched patterns and elevated strontium contents distinct from magmatic-hydrothermal anhydrite. Petrologic arguments suggest that the hydrous and oxidized Yanacocha magmas contained more than ~1000 ppm sulfur both dissolved in the melt and as a separate sulfate phase, which is sufficient to provide all the sulfur for the genetically related giant sulfur-rich Yanacocha epithermal gold deposits. High-aluminum amphiboles contain unusual anhydrite with wormy and amoeboidal textures, which are tentatively interpreted to represent trapping of an immiscible CaSO4-water melt together with sulfur-rich apatite at a temperature of ~950 °C and a water pressure >3 kbar. Such unusually sulfate-rich magmas may be required to produce sulfur-rich magmatic-hydrothermal mineral deposits.

Key Words: magmatic anhydrite • dacite • mineral deposits • sulfur




This article has been cited by other articles:


Home page
 ELEMENTSHome page
R. M. Tosdal, J. H. Dilles, and D. R. Cooke
From Source to Sinks in Auriferous Magmatic-Hydrothermal Porphyry and Epithermal Deposits
Elements, October 1, 2009; 5(5): 289 - 295.
[Abstract] [Full Text] [PDF]


JOURNAL HOME HELP CONTACT PUBLISHER SUBSCRIBE ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 2009 by Geological Society of America