Results 31 to 40 of about 91 (71)

Jasperoids of the Pando Area, Eagle County, Colorado [PDF]

, 1980
openaire   +1 more source

Jasperoid in the United States; its characteristics, origin, and economic significance

Professional Paper, 1972
openaire   +2 more sources

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Tridymitic jasperoid deposits in N. W. Queensland

Mineralium Deposita, 1977
A number of small, fault-controlled, siliceous, copper deposits in the Precambrian of North-West Queensland contain most of their silica as tridymitic jasperoid. The tridymite has pseudomorphically replaced the dynamic metamorphic assemblages that resulted from earlier fault movements.
W.J. McKay, T. Finlow-Bates
exaly   +2 more sources

Mapping of jasperoid in the Cedar Mountains, Utah, U.S.A., using imaging spectrometer data

International Journal of Remote Sensing, 1995
Abstract Jasperoid, an important indicator of disseminated gold deposits, is mapped in the Cedar Mountains, Utah U.S.A. using data gathered by the Airborne Visible Infra-Red Imaging Spectrometer (AVIRIS). Ratio analysis is employed to detect the sharp rise in reflectance between 1000 nm and 1700 nm in the jasperoid spectrum due to iron absorption at ...
Richard Murphy
exaly   +2 more sources

Jasperoid float and stream cobbles as tools in geochemical exploration for hydrothermal ore deposits

Journal of Geochemical Exploration, 1981
Abstract Fragments of silicified rocks that are associated with deposits of base and precious metals may be transported as cobbles and pebbles in alluvium far downstream from the source outcrop. These rocks commonly exhibit certain characteristics which distinguish them from other detrital siliceous material, and may thus serve as a useful tool in ...
exaly   +2 more sources

Genesis of secondary uranium minerals associated with jasperoid veins, El Erediya area, Eastern Desert, Egypt

Mineralium Deposita, 2007
Uranium mineralization in the El Erediya area, Egyptian Eastern Desert, has been affected by both high temperature and low temperature fluids. Mineralization is structurally controlled and is associated with jasperoid veins that are hosted by a granitic pluton.
Hamdy Abd El-Naby
exaly   +2 more sources

Mineralogy and U–Th–Pb age of a uranium-bearing jasperoid vein, Sunshine Mine, Coeur d'Alene district, Idaho, USA

Chemical Geology, 2009
Abstract The age of the Mesoproterozoic Belt Supergroup hosted silver and base metal vein deposits of the Coeur d'Alene mining district in northern Idaho has long been controversial. Evidence for Precambrian mineralization comes largely from many ∼ 1400 Ma Pb model ages for galena throughout the district, and several problematic 1100–1300 Ma 207Pb ...
Joseph V Smith, Robert E Zartman
exaly   +2 more sources

jasperoid

2009
exaly   +5 more sources

Micron Gold-Associated Jasperoid: Fluid Inclusion Chemistry and Geothermometry

Journal of Geochemical Exploration, 1986
Patricia H. Schnorr, Stephen E. Kesler, Paul L. Cloke   +2 more
exaly   +2 more sources

Lithogeochemistry of jasper and jasperoid around the sao domingos massive sulphide mineralization in the pyrite belt, Southern Portugal

Chemical Geology, 1988
Simon P Vriend
exaly   +2 more sources