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NARROW
GeoRef Subject
-
all geography including DSDP/ODP Sites and Legs
-
Africa
-
East Africa
-
Mozambique (1)
-
-
Southern Africa
-
Barberton greenstone belt (11)
-
Botswana (2)
-
Kaapvaal Craton (6)
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Lesotho (1)
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Namibia (1)
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South Africa
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Cape fold belt (1)
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Eastern Cape Province South Africa (1)
-
Mpumalanga South Africa (1)
-
Western Cape Province South Africa (1)
-
Witwatersrand (2)
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Swaziland (3)
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Zimbabwe Craton (1)
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Andros Island (1)
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Antelope Valley (1)
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Asia
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Far East
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China
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Shanxi China (1)
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Sichuan Basin (2)
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Sichuan China (1)
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Japan (3)
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Korea
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South Korea (2)
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Indian Peninsula
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India
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Srinagar India (1)
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Jammu and Kashmir
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Kashmir (1)
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Srinagar India (1)
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Middle East
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Iran (1)
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Australasia
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Australia
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Queensland Australia
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Hodgkinson Province (1)
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Tasmania Australia (1)
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New Zealand
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Nelson New Zealand
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Inangahua New Zealand (1)
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Battle Mountain (1)
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Bear Valley (1)
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Canada
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Eastern Canada
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Baffin Island (1)
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Maritime Provinces
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New Brunswick (2)
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Nova Scotia
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Halifax County Nova Scotia
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Halifax Nova Scotia (1)
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Ontario
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Manitoulin District Ontario
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Manitoulin Island (1)
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Quebec
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Mackenzie Mountains (1)
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Nunavut
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Western Canada
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British Columbia
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Canadian Rocky Mountains (1)
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Caribbean region
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Cascade Range (4)
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Dixie Valley (3)
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East Pacific Ocean Islands
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Hawaii
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Hawaii County Hawaii
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Kilauea (1)
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Europe
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Central Europe
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Germany (2)
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Southern Europe
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Bulgaria (1)
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Iberian Peninsula
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Portugal (1)
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Western Europe
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Fairview Peak (4)
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Front Range (1)
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McGrath Quadrangle (1)
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Mexico
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Mosquito Range (1)
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North America
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Appalachian Basin (1)
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Appalachians
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Southern Appalachians (1)
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Valley and Ridge Province (1)
-
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Basin and Range Province
-
Great Basin (14)
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Denali Fault (1)
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Great Lakes
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Great Plains (1)
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North American Cordillera (4)
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Rio Grande Rift (2)
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Rocky Mountains
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Western Canada Sedimentary Basin (1)
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Williston Basin (2)
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Oceania
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Melanesia
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Fiji
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Viti Levu (1)
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Polynesia
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Hawaii
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Hawaii County Hawaii
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Hawaii Island
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Kilauea (1)
-
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Owens Valley (3)
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Pacific Coast (1)
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Permian Basin (1)
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Rainbow Mountain (2)
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Round Mountain (1)
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Salt Valley (1)
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San Andreas Fault (6)
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Searles Lake (1)
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Sierra Nevada (12)
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South America
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Colombia (1)
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Ecuador (1)
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South Island (2)
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South Mountain Batholith (1)
-
United States
-
Alabama
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Greene County Alabama (1)
-
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Alaska
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Anchorage Alaska (1)
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Iditarod Quadrangle (1)
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Nixon Fork Terrane (1)
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Prince William Sound (1)
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Sleetmute Quadrangle (1)
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Arizona (2)
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California
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Alpine County California (1)
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Butte County California
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Central California (3)
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El Dorado County California (1)
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Garlock Fault (1)
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Imperial County California
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Inyo County California
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Kern County California (1)
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Los Angeles County California
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Los Angeles California
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San Fernando California (1)
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Madera County California (1)
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Mariposa County California (1)
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Modoc Plateau (1)
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Mono County California
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Inyo Domes (1)
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Long Valley Caldera (1)
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Mono Craters (1)
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Nevada County California (1)
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Northern California (1)
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Sacramento County California
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Sacramento California (1)
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San Benito County California
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San Juan Bautista California (1)
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San Bernardino County California
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Landers California (1)
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Santa Barbara County California
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Lompoc California (1)
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Shasta County California (1)
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Sierra Nevada Batholith (2)
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Southern California (7)
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Tulare County California (1)
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Chesapeake Bay (1)
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Cincinnati Arch (4)
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Colorado
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Saguache County Colorado (1)
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Colorado Plateau (1)
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Eastern California shear zone (4)
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Eastern U.S. (4)
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Great Basin (14)
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Hawaii
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Hawaii County Hawaii
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Hawaii Island
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Kilauea (1)
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Idaho
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Ada County Idaho
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Boise Idaho (1)
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Custer County Idaho
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Borah Peak (1)
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Challis Idaho (1)
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Lost River Fault (5)
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Lost River Range
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Borah Peak (1)
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Illinois (3)
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Indiana
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Dearborn County Indiana (2)
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Franklin County Indiana (2)
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Jefferson County Indiana (2)
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Switzerland County Indiana (1)
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Iowa (1)
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Kansas (3)
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Kentucky
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Boone County Kentucky (1)
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Bracken County Kentucky (3)
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Campbell County Kentucky (1)
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Grant County Kentucky (1)
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Kenton County Kentucky (1)
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Mason County Kentucky (2)
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Lake Tahoe (2)
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Louisiana (1)
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Maryland (5)
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Midcontinent (1)
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Midwest (2)
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Minnesota (2)
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Missouri (2)
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Mojave Desert (2)
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Montana
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Gallatin County Montana
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Hebgen Lake (3)
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Nevada
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Carson City County Nevada (4)
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Churchill County Nevada (4)
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Clark County Nevada
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Las Vegas Nevada (2)
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Douglas County Nevada (1)
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Elko County Nevada (1)
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Humboldt County Nevada
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Santa Rosa Range (1)
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Lyon County Nevada (1)
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Mineral County Nevada (3)
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Nevada Test Site (2)
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Nye County Nevada
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Yucca Mountain (2)
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Pershing County Nevada
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Humboldt Range (1)
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Roberts Mountains Allochthon (1)
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Storey County Nevada (1)
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Washoe County Nevada
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New Mexico (2)
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New York
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Monroe County New York (1)
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Niagara County New York (1)
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Orleans County New York (1)
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North Carolina (1)
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North Dakota (1)
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Ohio
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Brown County Ohio (1)
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Greene County Ohio (1)
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Hamilton County Ohio
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Cincinnati Ohio (2)
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Highland County Ohio (1)
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Montgomery County Ohio (1)
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Warren County Ohio (1)
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Oklahoma
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Oregon
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Pennsylvania
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U. S. Rocky Mountains
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Utah
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Box Elder County Utah (1)
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Carbon County Utah (2)
-
Davis County Utah (1)
-
Emery County Utah (2)
-
Salt Lake County Utah
-
Salt Lake City Utah (2)
-
-
Sanpete County Utah (1)
-
Utah County Utah (1)
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Wasatch Plateau (1)
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Virginia (5)
-
Walker Lane (6)
-
Wasatch fault zone (2)
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Wasatch Front (2)
-
Washington
-
Chelan County Washington (2)
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King County Washington
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Seattle Washington (1)
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Olympic Mountains (1)
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Puget Sound (1)
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West Virginia
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Western U.S. (15)
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Wisconsin
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Milwaukee County Wisconsin
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Wyoming (1)
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Walker Lake (1)
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White Mountains (2)
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Willow Creek (1)
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commodities
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diamond deposits (1)
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energy sources (4)
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gems (1)
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geothermal energy (3)
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limestone deposits (1)
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metal ores
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base metals (1)
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beryllium ores (1)
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copper ores (1)
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gold ores (18)
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lead ores (1)
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lead-zinc deposits (1)
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molybdenum ores (1)
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nickel ores (1)
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silver ores (1)
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mineral deposits, genesis (15)
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mineral exploration (5)
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oil and gas fields (6)
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petroleum
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natural gas
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shale oil (1)
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placers (1)
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elements, isotopes
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carbon
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C-14 (8)
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chemical ratios (2)
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hydrogen
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D/H (1)
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incompatible elements (1)
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isotope ratios (6)
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isotopes
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radioactive isotopes
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Be-10 (1)
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C-14 (8)
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stable isotopes
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D/H (1)
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Hf-177/Hf-176 (1)
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N-15/N-14 (1)
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Nd-144/Nd-143 (1)
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O-18/O-16 (2)
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S-34/S-32 (1)
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Sr-87/Sr-86 (3)
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metals
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actinides
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uranium (1)
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alkali metals
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potassium (1)
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sodium (1)
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alkaline earth metals
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strontium
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antimony (1)
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arsenic (2)
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gold (2)
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hafnium
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lead (1)
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silver (2)
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nitrogen
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N-15/N-14 (1)
-
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oxygen
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O-18/O-16 (2)
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selenium (1)
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sulfur
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tellurium (2)
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fossils
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borings (2)
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Chordata
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Vertebrata
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Tetrapoda
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Reptilia
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ichnofossils (2)
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Invertebrata
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Arthropoda
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Trilobitomorpha
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Brachiopoda
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Articulata
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Cnidaria
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Echinodermata
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Crinozoa
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Mollusca
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Cephalopoda
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Vermes
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microfossils
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Conodonta (2)
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Plantae
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nannofossils (1)
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tracks (1)
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geochronology methods
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fission-track dating (1)
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infrared stimulated luminescence (3)
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paleomagnetism (1)
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U/Pb (15)
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geologic age
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Cenozoic
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Quaternary
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upper Quaternary (6)
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Tertiary
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Miocene
-
upper Miocene
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Modelo Formation (1)
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Pliocene
-
lower Pliocene (1)
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-
-
Paleogene
-
Eocene
-
Chuckanut Formation (1)
-
Chumstick Formation (4)
-
lower Eocene
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Swauk Formation (1)
-
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Oligocene (1)
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Paleocene-Eocene Thermal Maximum (1)
-
-
-
-
Mesozoic
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Cretaceous
-
Kuskokwim Group (1)
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Potomac Group (1)
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Upper Cretaceous
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Senonian (1)
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Tuolumne Intrusive Suite (2)
-
-
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Jurassic
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Upper Jurassic
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Cotton Valley Group (1)
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-
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Triassic
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MIS 2 (1)
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MIS 6 (1)
-
Paleozoic
-
Arbuckle Group (1)
-
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-
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Poleta Formation (1)
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-
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-
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-
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Carboniferous
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Upper Mississippian
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-
-
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Upper Carboniferous (1)
-
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Devonian
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Oriskany Sandstone (1)
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Middle Devonian
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Marcellus Shale (1)
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-
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Ordovician
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-
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-
Cincinnatian
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-
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Fairview Formation (3)
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Katian (2)
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Kope Formation (5)
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Maquoketa Formation (1)
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Trentonian (1)
-
Whitewater Formation (1)
-
-
-
Permian
-
Lower Permian (1)
-
Upper Permian
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Permian-Triassic boundary (1)
-
-
-
Silurian
-
Lower Silurian
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Tuscarora Formation (1)
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Wenlock (1)
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Middle Silurian
-
Rochester Formation (1)
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-
-
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Phanerozoic (5)
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Precambrian
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Archean
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Fig Tree Group (2)
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Onverwacht Group (2)
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Stirling Quartzite (1)
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-
upper Precambrian
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Proterozoic
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Neoproterozoic (2)
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Wyman Formation (1)
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igneous rocks
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glasses (1)
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komatiite (3)
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pyroclastics
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ash-flow tuff (2)
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ignimbrite (5)
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tuff (7)
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volcanic ash (2)
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metamorphic rocks
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turbidite (1)
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meteorites
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meteorites
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Tieschitz Meteorite (1)
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minerals
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halides
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Primary terms
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Fairview Mine
COMMENTS ON THE PAPER “CRATONIC EXTENSION AND ARCHAEAN GOLD MINERALISATION IN THE SHEBA-FAIRVIEW MINE, BARBERTON GREENSTONE BELT, SOUTH AFRICA” BY P.H.G.M. DIRKS, E.G. CHARLESWORTH AND M.R. MUNYAI (SAJG, 112, 291–316, 2009)
REPLY TO COMMENTS BY J.H.W. WARD ON THE PAPER “CRATONIC EXTENSION AND ARCHAEAN GOLD MINERALISATION IN THE SHEBA-FAIRVIEW MINE, BARBERTON GREENSTONE BELT, SOUTH AFRICA” BY P.H.G.M. DIRKS, E.G. CHARLESWORTH AND M.R. MUNYAI (SAJG, 112, 291–316, 2009)
CRATONIC EXTENSION AND ARCHAEAN GOLD MINERALISATION IN THE SHEBA-FAIRVIEW MINE, BARBERTON GREENSTONE BELT, SOUTH AFRICA
ABSTRACT Early Archean spherule layers, widely accepted to represent distal ejecta deposits from large-scale impact events onto the early Earth, have been described from several stratigraphic levels of the Barberton greenstone belt in South Africa. Recently, exploration drilling at the Fairview Gold Mine (25°43′53″S, 31°5′59″E) in the northern domain of the belt resulted in the discovery of a new set of spherule layer intersections. The Fairview spherule layers in drill cores BH5901, BH5907, BH5911, and BH5949 were intersected just a few meters apart, at about the same stratigraphic position within the transition from the Onverwacht Group to the Fig Tree Group. The Fairview spherule layers have petrographic and chemical similarities to at least three other well-known Barberton spherule layers (S2–S4), and multiple spherule layer bed intersections in drill cores BARB5 and CT3, all from about the same stratigraphic position. They are not uniform in composition, in particular with respect to abundances of highly siderophile elements. The highest concentrations of moderately (Cr, Co, Ni) and highly siderophile (Ir) elements are within the range of concentrations for chondrites and, thus, reinforce the impact hypothesis for the generation of the Fairview spherule layers. Iridium peak concentrations and Cr/Ir interelement ratios for spherule layer samples from drill cores BH5907, BH5911, and BH5949 suggest admixtures of 50%–60% chondritic material, whereas for the BH5901 spherule layer, only an admixture of 1% chondritic material is indicated. We discuss whether these four Fairview spherule layers represent the same impact event, and whether they can be correlated to any of the S2–S4, CT3, and BARB5 intersections.