John F. Slack
John Slack is a Scientist Emeritus with the USGS Geology, Energy & Minerals (GEM) Science Center in Reston, VA.
Science and Products
Filter Total Items: 69
Bedded jaspers of the Ordovician Løkken ophiolite, Norway: seafloor deposition and diagenetic maturation of hydrothermal plume-derived silica-iron gels
Sedimentary beds of jasper (red hematitic chert) in the Ordovician Løkken ophiolite of Norway are closely associated with volcanogenic massive sulphide (VMS) deposits. The jaspers occur in the immediate hangingwall and laterally peripheral to the large Løkken (25–30 Mt) and small Høydal (0.1 Mt) VMS deposits, and are exposed discontinuously for several kilometres along strike. Massive or laminated
Authors
Tor Grenne, John F. Slack
Geochronology and geology of late Oligocene through Miocene volcanism and mineralization in the western San Juan Mountains, Colorado
This paper presents 25 new 40Ar/39Ar dates from the main calc-alkaline ash-flow sheets and related younger plutons of the western San Juan volcanic field, the ash-flow sheets of the Lake City caldera cycle, and veins and other altered rocks in the Lake City region. The goal of the study was to produce similar quality 40Ar/39Ar ages to those currently published for the eastern and central San Juan
Authors
Dana J. Bove, Ken Hon, Karin E. Budding, John F. Slack, Lawrence W. Snee, Ross A. Yeoman
Sm-Nd dating of the giant Sullivan Pb-Zn-Ag deposit, British Columbia
We report here Sm and Nd isotope data for hydrothermal tourmalinites and sulfide ores from the giant Sullivan Pb-Zn-Ag deposit, which occurs in the lower part of the Mesoproterozoic Purcell (Belt) Supergroup. Whole-rock samples of quartz-tourmaline tourmalinite from the footwall alteration pipe yield a Sm-Nd isochron age of 1470 ± 59 Ma, recording synsedimentary B metasomatism of clastic sediments
Authors
Shao-Yong Jiang, John F. Slack, Martin R. Palmer
USGS research on mineral resources, 1991; program and abstracts
No abstract available.
Authors
Elizabeth E. Good, John F. Slack, Rama K. Kotra
Summary results of the Glens Falls CUSMAP project, New York, Vermont, and New Hampshire
No abstract available.
Authors
John F. Slack
DEVILS DEN ROADLESS AREA, VERMONT.
A mineral-resource survey was made of the Devils Den Roadless Area, Vermont, Geochemical sampling found traces of gold, copper, barium, lead, molybdenum, silver, tin, and thorium in rocks, stream sediments, and panned concentrates, but not in sufficient quantities to identify any resource potential. The only apparent resources are nonmetallic commodities including abundant rock suitable for crushi
Authors
John F. Slack, Andrew E. Sabin
Mineral resources of the Citico Creek Wilderness Study Area, Monroe County, Tennessee
No abstract available.
Authors
John F. Slack, E. R. Force, P. T. Behum, B. B. Williams
BIG FROG WILDERNESS STUDY AREA AND ADDITIONS, TENNESSEE AND GEORGIA.
A mineral-resource survey was made of the Big Frog Wilderness Study Area and additions, Tennessee-Georgia. Geochemical sampling found traces of gold, zinc, copper, and arsenic in rocks, stream sediments, and panned concentrates, but not in sufficient quantities to indicate the presence of deposits of these metals. The results of the survey indicate that there is little promise for the occurrence o
Authors
John F. Slack, Gertrude C. Gazdik
CITICO CREEK WILDERNESS STUDY AREA, TENNESSEE.
A mineral-resource survey of the Citico Creek Wilderness Study Area, in easternmost Tennessee, indicated that the area offers little promise for the occurrence of metallic mineral resources. Geochemical sampling found traces of gold, copper, cobalt, barium, arsenic, lead, zinc, and thorium in rocks, stream sediments, and panned concentrates, but not in sufficient quantities to indicate the presenc
Authors
John F. Slack, Paul T. Behum
BRISTOL CLIFFS WILDERNESS, VERMONT.
A mineral-resource survey of the Bristol Cliffs Wilderness, Vermont, indicates that there is little promise for the occurrence of metallic mineral resources within the wilderness. The only apparent resources are nonmetallic commodities including rocks suitable for construction materials and silica sand, and small amounts of peat and sand and gravel; however, these commodities are found in abundanc
Authors
John F. Slack, Peter C. Mory
BREAD LOAF ROADLESS AREA, VERMONT.
On the basis of mineral-resource survey the Bread Loaf Roadless Area, Vermont, is considered to have probable resource potential for the occurrence of volcanogenic massive sulfide deposits of copper, zinc, and lead, particularly in the north and northeastern section of the roadless area. Nonmetallic commodities include minor deposits of sand and gravel, and abundant rock suitable for crushing. How
Authors
John F. Slack, Richard F. Bitar
Mineral resources of the Big Frog Wilderness Study Area and additions, Polk County, Tennessee and Fannin County, Georgia
No abstract available.
Authors
John F. Slack, Gertrude C. Gazdik, Maynard L. Dunn
Science and Products
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Filter Total Items: 69
Bedded jaspers of the Ordovician Løkken ophiolite, Norway: seafloor deposition and diagenetic maturation of hydrothermal plume-derived silica-iron gels
Sedimentary beds of jasper (red hematitic chert) in the Ordovician Løkken ophiolite of Norway are closely associated with volcanogenic massive sulphide (VMS) deposits. The jaspers occur in the immediate hangingwall and laterally peripheral to the large Løkken (25–30 Mt) and small Høydal (0.1 Mt) VMS deposits, and are exposed discontinuously for several kilometres along strike. Massive or laminatedAuthorsTor Grenne, John F. SlackGeochronology and geology of late Oligocene through Miocene volcanism and mineralization in the western San Juan Mountains, Colorado
This paper presents 25 new 40Ar/39Ar dates from the main calc-alkaline ash-flow sheets and related younger plutons of the western San Juan volcanic field, the ash-flow sheets of the Lake City caldera cycle, and veins and other altered rocks in the Lake City region. The goal of the study was to produce similar quality 40Ar/39Ar ages to those currently published for the eastern and central San JuanAuthorsDana J. Bove, Ken Hon, Karin E. Budding, John F. Slack, Lawrence W. Snee, Ross A. YeomanSm-Nd dating of the giant Sullivan Pb-Zn-Ag deposit, British Columbia
We report here Sm and Nd isotope data for hydrothermal tourmalinites and sulfide ores from the giant Sullivan Pb-Zn-Ag deposit, which occurs in the lower part of the Mesoproterozoic Purcell (Belt) Supergroup. Whole-rock samples of quartz-tourmaline tourmalinite from the footwall alteration pipe yield a Sm-Nd isochron age of 1470 ± 59 Ma, recording synsedimentary B metasomatism of clastic sedimentsAuthorsShao-Yong Jiang, John F. Slack, Martin R. PalmerUSGS research on mineral resources, 1991; program and abstracts
No abstract available.AuthorsElizabeth E. Good, John F. Slack, Rama K. KotraSummary results of the Glens Falls CUSMAP project, New York, Vermont, and New Hampshire
No abstract available.AuthorsJohn F. SlackDEVILS DEN ROADLESS AREA, VERMONT.
A mineral-resource survey was made of the Devils Den Roadless Area, Vermont, Geochemical sampling found traces of gold, copper, barium, lead, molybdenum, silver, tin, and thorium in rocks, stream sediments, and panned concentrates, but not in sufficient quantities to identify any resource potential. The only apparent resources are nonmetallic commodities including abundant rock suitable for crushiAuthorsJohn F. Slack, Andrew E. SabinMineral resources of the Citico Creek Wilderness Study Area, Monroe County, Tennessee
No abstract available.AuthorsJohn F. Slack, E. R. Force, P. T. Behum, B. B. WilliamsBIG FROG WILDERNESS STUDY AREA AND ADDITIONS, TENNESSEE AND GEORGIA.
A mineral-resource survey was made of the Big Frog Wilderness Study Area and additions, Tennessee-Georgia. Geochemical sampling found traces of gold, zinc, copper, and arsenic in rocks, stream sediments, and panned concentrates, but not in sufficient quantities to indicate the presence of deposits of these metals. The results of the survey indicate that there is little promise for the occurrence oAuthorsJohn F. Slack, Gertrude C. GazdikCITICO CREEK WILDERNESS STUDY AREA, TENNESSEE.
A mineral-resource survey of the Citico Creek Wilderness Study Area, in easternmost Tennessee, indicated that the area offers little promise for the occurrence of metallic mineral resources. Geochemical sampling found traces of gold, copper, cobalt, barium, arsenic, lead, zinc, and thorium in rocks, stream sediments, and panned concentrates, but not in sufficient quantities to indicate the presencAuthorsJohn F. Slack, Paul T. BehumBRISTOL CLIFFS WILDERNESS, VERMONT.
A mineral-resource survey of the Bristol Cliffs Wilderness, Vermont, indicates that there is little promise for the occurrence of metallic mineral resources within the wilderness. The only apparent resources are nonmetallic commodities including rocks suitable for construction materials and silica sand, and small amounts of peat and sand and gravel; however, these commodities are found in abundancAuthorsJohn F. Slack, Peter C. MoryBREAD LOAF ROADLESS AREA, VERMONT.
On the basis of mineral-resource survey the Bread Loaf Roadless Area, Vermont, is considered to have probable resource potential for the occurrence of volcanogenic massive sulfide deposits of copper, zinc, and lead, particularly in the north and northeastern section of the roadless area. Nonmetallic commodities include minor deposits of sand and gravel, and abundant rock suitable for crushing. HowAuthorsJohn F. Slack, Richard F. BitarMineral resources of the Big Frog Wilderness Study Area and additions, Polk County, Tennessee and Fannin County, Georgia
No abstract available.AuthorsJohn F. Slack, Gertrude C. Gazdik, Maynard L. Dunn