- Abstract
- Affiliation
- All
- Authors
- Book Series
- DOI
- EISBN
- EISSN
- Full Text
- GeoRef ID
- ISBN
- ISSN
- Issue
- Keyword (GeoRef Descriptor)
- Meeting Information
- Report #
- Title
- Volume
- Abstract
- Affiliation
- All
- Authors
- Book Series
- DOI
- EISBN
- EISSN
- Full Text
- GeoRef ID
- ISBN
- ISSN
- Issue
- Keyword (GeoRef Descriptor)
- Meeting Information
- Report #
- Title
- Volume
- Abstract
- Affiliation
- All
- Authors
- Book Series
- DOI
- EISBN
- EISSN
- Full Text
- GeoRef ID
- ISBN
- ISSN
- Issue
- Keyword (GeoRef Descriptor)
- Meeting Information
- Report #
- Title
- Volume
- Abstract
- Affiliation
- All
- Authors
- Book Series
- DOI
- EISBN
- EISSN
- Full Text
- GeoRef ID
- ISBN
- ISSN
- Issue
- Keyword (GeoRef Descriptor)
- Meeting Information
- Report #
- Title
- Volume
- Abstract
- Affiliation
- All
- Authors
- Book Series
- DOI
- EISBN
- EISSN
- Full Text
- GeoRef ID
- ISBN
- ISSN
- Issue
- Keyword (GeoRef Descriptor)
- Meeting Information
- Report #
- Title
- Volume
- Abstract
- Affiliation
- All
- Authors
- Book Series
- DOI
- EISBN
- EISSN
- Full Text
- GeoRef ID
- ISBN
- ISSN
- Issue
- Keyword (GeoRef Descriptor)
- Meeting Information
- Report #
- Title
- Volume
NARROW
GeoRef Subject
-
all geography including DSDP/ODP Sites and Legs
-
United States
-
Coeur d'Alene mining district (1)
-
Idaho (2)
-
Montana
-
Lincoln County Montana (1)
-
-
-
-
commodities
-
brines (1)
-
metal ores
-
copper ores (4)
-
polymetallic ores (1)
-
silver ores (3)
-
-
mineral deposits, genesis (3)
-
mineral exploration (1)
-
petroleum
-
natural gas (1)
-
-
-
elements, isotopes
-
carbon
-
C-13/C-12 (1)
-
-
hydrogen (1)
-
isotope ratios (2)
-
isotopes
-
stable isotopes
-
C-13/C-12 (1)
-
O-18/O-16 (2)
-
S-34/S-32 (1)
-
-
-
oxygen
-
O-18/O-16 (2)
-
-
sulfur
-
S-34/S-32 (1)
-
-
-
geochronology methods
-
Pb/Pb (1)
-
U/Pb (1)
-
-
geologic age
-
Precambrian
-
upper Precambrian
-
Proterozoic
-
Mesoproterozoic
-
Belt Supergroup (4)
-
Ravalli Group (1)
-
Revett Quartzite (3)
-
-
-
-
-
-
metamorphic rocks
-
metamorphic rocks
-
metasedimentary rocks (1)
-
-
-
minerals
-
oxides
-
magnetite (2)
-
spinel group (1)
-
-
phosphates
-
monazite (1)
-
xenotime (1)
-
-
-
Primary terms
-
absolute age (1)
-
brines (1)
-
carbon
-
C-13/C-12 (1)
-
-
diagenesis (1)
-
economic geology (1)
-
geochemistry (1)
-
hydrogen (1)
-
inclusions
-
fluid inclusions (1)
-
-
isotopes
-
stable isotopes
-
C-13/C-12 (1)
-
O-18/O-16 (2)
-
S-34/S-32 (1)
-
-
-
metal ores
-
copper ores (4)
-
polymetallic ores (1)
-
silver ores (3)
-
-
metamorphic rocks
-
metasedimentary rocks (1)
-
-
metamorphism (2)
-
mineral deposits, genesis (3)
-
mineral exploration (1)
-
oxygen
-
O-18/O-16 (2)
-
-
paragenesis (1)
-
petroleum
-
natural gas (1)
-
-
Precambrian
-
upper Precambrian
-
Proterozoic
-
Mesoproterozoic
-
Belt Supergroup (4)
-
Ravalli Group (1)
-
Revett Quartzite (3)
-
-
-
-
-
sedimentary rocks
-
clastic rocks
-
red beds (2)
-
-
-
sulfur
-
S-34/S-32 (1)
-
-
United States
-
Coeur d'Alene mining district (1)
-
Idaho (2)
-
Montana
-
Lincoln County Montana (1)
-
-
-
-
sedimentary rocks
-
sedimentary rocks
-
clastic rocks
-
red beds (2)
-
-
-
Element partitioning in magnetite under low-grade metamorphic conditions – a case study from the Proterozoic Belt Supergroup, USA
The Spar Lake Strata-Bound Cu-Ag Deposit Formed Across a Mixing Zone Between Trapped Natural Gas and Metals-Bearing Brine
SHRIMP U-Pb Ages of Xenotime and Monazite from the Spar Lake Red Bed-Associated Cu-Ag Deposit, Western Montana: Implications for Ore Genesis
Geochemistry of Magnetite from Hydrothermal Ore Deposits and Host Rocks of the Mesoproterozoic Belt Supergroup, United States
Abstract Exotic copper deposits, ferricretes, and manganocretes in Arizona, New Mexico, and Sonora are metal deposits in conglomerates that are spatially and genetically associated with porphyry Cu deposits. Deposits of this exotic class are typically zoned from ferricrete upgradient and extending into the bedrock leached capping, to black manganese oxides or Cu wad next downgradient, and to chrysocolla farther downgradient in the Cu-rich systems. Small deposits may lack zonation. Entire zoned systems vary from as little as 500 m long up to 6 km long (in Chile). In the Sonoran province, the El Pilar exotic Cu deposit exceeds 160 Mt at 0.4 percent Cu, but only one other known deposit was more than 10 Mt. Small tonnages of several percent Cu were selectively mined, between about 1880 and 1920, from chrysocolla zones. Average grades are typically 0.7 to 2 percent Cu in chrysocolla zones but mostly 0.5 percent or less in Cu wad zones. Solvent extraction-electrowinning (SXEW) will treat most exotic Cu ores. Ferricretes and manganocretes are not economic at present, although Mn deposits that may be of this class were mined in the past. Exotic Cu deposits form when a headward-eroding stream intersects a forming supergene enrichment profile of a bedrock porphyry Cu deposit ( Münchmeyer, 1996 ). Acidic metals-charged groundwater then discharges laterally into the alluvial aquifer and neutralizes and oxidizes while moving downgradient. It deposits metals in the conglomerates in the following order: first, hematite, then copper wad, and, finally, chrysocolla. Where the porphyry system is merely pyritic, upgradient goethitic