Fluid-inclusion characteristics of Oligocene to Miocene iron-oxide Cu-Au (IOCG) deposits in central western Arizona

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Author
Spencer, J.E.
Duncan, J.T.
Issue Date
2015-08-31
Keywords
Arizona Geological Survey Open File Reports
gold
copper
Ore
mineralization
detachment fault
Miocene
Black Burro
Box Canyon
Artillery Mountains

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Citation
Spencer, J.E. and Duncan, J.T., 2015, Fluid-inclusion characteristics of Oligocene to Miocene iron-oxide Cu-Au (IOCG) deposits in central western Arizona. Arizona Geological Survey Open-File Report, OFR-15-05, 16 p., 3 appendices.
Publisher
Arizona Geological Survey (Tucson, AZ)
Description
Extreme Late Oligocene to middle Miocene tectonic extension in central western Arizona was associated with exhumation of deep crustal rocks to form metamorphic core complexes, felsic to mafic magmatic activity, and formation and subsidence of sedimentary basins. Tectonic extension was accompanied by genesis of iron-oxide copper gold (IOCG) deposits along and near extensional detachment faults. Fluid-inclusion analyses from these deposits indicate derivation from saline fluids at moderate temperature, as identified in previous studies. Many other Miocene epithermal mineral deposits in the region were derived from high-salinity fluids, indicating that brines were characteristic of mineralizing fluids regionally and were not limited to areas affected by detachment faulting. Some outlying deposits have a range of fluid-inclusion salinities within a single sample, suggesting changing ratios of contrasting-salinity fluids that mixed during deposit genesis. Manganese mineralization and K-metasomatism were widespread over the same area and occurred at about the same time, but it has not been possible to demonstrate a relationship between these disparate geochemical processes even though such a relationship seems likely.
URI
http://hdl.handle.net/10150/630721
Additional Links
https://library.azgs.arizona.edu/item/AOFR-1552428209281-215
Language
en
Series/Report no.
OFR-15-05 V 1.0
Rights
Arizona Geological Survey. All rights reserved.
Collection Information
Documents in the AZGS Document Repository collection are made available by the Arizona Geological Survey (AZGS) and the University Libraries at the University of Arizona. For more information about items in this collection, please contact azgs-info@email.arizona.edu.
North Bounding Coordinate
34.8116
South Bounding Coordinate
32.988
West Bounding Coordinate
-114.796
East Bounding Coordinate
-112.39
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