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Black shales are dark, as a result of being especially rich in unoxidized carbon. Common in some Paleozoic and Mesozoic strata, black shales were deposited in anoxic, reducing environments, such as in stagnant water columns. [8] Some black shales contain abundant heavy metals such as molybdenum, uranium, vanadium, and zinc.
The black shale layers have anomalously high radioactivity (due to uranium), phosphorus, and heavy metals. [2] The formation was named for outcrops near New Albany, Indiana . It is one of a number of organic-rich shales of upper Devonian and lower Mississippian age in North America.
He was the founder and president of Geoxplorers International, Inc. known primarily for his activities related to the "shale gas revolution" in Poland. Together with his partner Ryszard A. Korol, he co-invented the "6M-EX" technology to recover precious metals from black shale and flotation tailings. He worked and lectured in over 60 countries.
Black shale mineralisations are large low-grade resources of uranium. They form in submarine environments under oxygen-free conditions. Organic matter in clay-rich sediments will not be converted to CO 2 by biological processes in this environment and it can reduce and immobilise uranium dissolved in seawater. Average uranium grades of black ...
Under reflected light, magnetite shows up as metallic and a silver or black color. Hematite will be a more reddish-yellow color. Pyrite is seen as opaque, a yellow-gold color, and metallic. [12] Chamosite is an olive-green color in thin section that readily oxidizes to limonite. When it is partially or fully oxidized to limonite, the green ...
The Burket Shale or Geneseo Shale is the lowest member of the Harrell Shale/Genessee Group. The Burket is an organic-rich black shale that rests just above the Tully Limestone member of the Mahantango Formation. The geographical extent of the formation includes southern New York, Pennsylvania, eastern Ohio, and West Virginia. The Burket is also ...
For example, concretions in sandstones or shales are commonly formed of a carbonate mineral such as calcite; those in limestones are commonly an amorphous or microcrystalline form of silica such as chert, flint, or jasper; while those in black shale may be composed of pyrite. [18]
[1] [2] It is correlated with Swedish alum shale being its younger facial eastward continuation, and both being a part of the Baltoscandic Cambrian-Ordovician black shale, together with black shales in the Oslo region in Norway, Bornholm, Denmark, and Poland. [2] [3] Other known occurrences are in North America, [4] the Malay Peninsula, [5] and ...