New evidence of magmatic-fluid-related phyllic alteration: Implications for the genesis of porphyry Cu deposits

Harris, Anthony C. and Golding, Suzanne D. (2002) New evidence of magmatic-fluid-related phyllic alteration: Implications for the genesis of porphyry Cu deposits. Geology, 30 4: 335-338. doi:10.1130/0091-7613(2002)030<0335:NEOMFR>2.0.CO;2


Author Harris, Anthony C.
Golding, Suzanne D.
Title New evidence of magmatic-fluid-related phyllic alteration: Implications for the genesis of porphyry Cu deposits
Journal name Geology   Check publisher's open access policy
ISSN 0091-7613
1943-2682
Publication date 2002-04
Sub-type Article (original research)
DOI 10.1130/0091-7613(2002)030<0335:NEOMFR>2.0.CO;2
Volume 30
Issue 4
Start page 335
End page 338
Total pages 4
Editor A. Burkard
Place of publication Boulder, CO, U.S.A.
Publisher Geological Society of America
Collection year 2002
Language eng
Subject C1
260301 Geochronology and Isotope Geochemistry
780104 Earth sciences
Formatted abstract
The phyllic alteration in a number of circum-Pacific porphyry Cu-Au deposits is related to high-temperature saline magmatic fluids. This contradicts the widely used genetic models wherein phyllic alteration formed as the result of mixing between magmatic and meteoric fluids. At the Endeavour 26 North porphyry deposit in eastern Australia, the transition from early potassic to the main-stage phyllic alteration is associated with fluids that with time decline in total salinity, NaCl/KCl, and temperature from ∼600 to ∼550 °C. Calculated and measured δ18O and δD compositions of fluids (5.1‰–8.5‰ δ18O, −57‰ to −73‰ δD) confirm a primary magmatic origin for both the early potassic and main- stage phyllic alteration. These results are consistent with other recent studies (e.g., El Salvador, Chile, Far Southeast, Philippines, and Panguna and Porgera, Papua New Guinea) and suggest that, rather than these results being unusual, a major revision of porphyry Cu genetic models is required.
© 2002 Geological Society of America.
Keyword Copper
Gold
Magmatic
Ore-forming fluids
Porphyry
Geology
Copper-deposit
Hydrogen isotope
Hydrothermal alteration
British-columbia
Water
Systems
Mineralization
Fractionation
Inclusion
Oxygen
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
School of Earth Sciences Publications
School of Physical Sciences Publications
 
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Created: Tue, 14 Aug 2007, 18:00:28 EST