Results 331 to 340 of about 146,299 (379)
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Geological Magazine, 1925
It is proposed to offer a few remarks as to the general relations of the rocks described to their associates in the Channel Islands, and in the Armorican Massif generally.
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It is proposed to offer a few remarks as to the general relations of the rocks described to their associates in the Channel Islands, and in the Armorican Massif generally.
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Journal of Geological Education, 1993
(1993). Timetable of Petrology. Journal of Geological Education: Vol. 41, No. 5, pp. 447-489.
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(1993). Timetable of Petrology. Journal of Geological Education: Vol. 41, No. 5, pp. 447-489.
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Proceedings of the Geologists' Association, 1975
Cretaceous chalk is a micritic limestone, mostly debris from planktonic algae, largely in micron-sized plates, but some still in their original circular groupings called coccoliths. Nearly all the material was deposited as low-Mg calcite which is stable at surface temperatures and pressures, which means that most chalk has been spared early ...
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Cretaceous chalk is a micritic limestone, mostly debris from planktonic algae, largely in micron-sized plates, but some still in their original circular groupings called coccoliths. Nearly all the material was deposited as low-Mg calcite which is stable at surface temperatures and pressures, which means that most chalk has been spared early ...
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Annual Review of Earth and Planetary Sciences, 2002
▪ Abstract  The subducted lithosphere is composed of a complex pattern of chemical systems that undergo continuous and discontinuous phase transformation, through pressure and temperature variations. Volatile recycling plays a major geodynamic role in triggering mass transfer, melting, and volcanism.
Max W. Schmidt, Stefano Poli
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▪ Abstract  The subducted lithosphere is composed of a complex pattern of chemical systems that undergo continuous and discontinuous phase transformation, through pressure and temperature variations. Volatile recycling plays a major geodynamic role in triggering mass transfer, melting, and volcanism.
Max W. Schmidt, Stefano Poli
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Applied Optics, 1964
This paper considers the use of the microscope in petrology, with particular reference to the polarizing microscope. The underlying principles of the preparation of a thin section and its subsequent investigation are briefly discussed. A detailed, step-by-step account is given of the microscopic methods employed to determine the mineral constituents in
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This paper considers the use of the microscope in petrology, with particular reference to the polarizing microscope. The underlying principles of the preparation of a thin section and its subsequent investigation are briefly discussed. A detailed, step-by-step account is given of the microscopic methods employed to determine the mineral constituents in
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The Petrology of the North Conway Quadrangle in the White Mountains of New Hampshire
Doubt space hydrolyze nucleophile, thus, a second set of driving forces behind the development was in the works and A.Bertalanfi Sh.Byulera. Communication, ichodya of what The petrology of the North Conway quadrangle in the White Mountains of New ...
M. Billings
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Geological Society of America Bulletin, 1958
The mineralogy of Pennsylvanian underclays and associated rocks collected from the Appalachian, Illinois, and Mid-Continent basins was determined to see how it varied regionally, stratigraphically, and within underclay profiles. Underclays are composed principally of kaolinite of a poorly crystallized type, illite, mixed-layer illite-montmorillonite ...
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The mineralogy of Pennsylvanian underclays and associated rocks collected from the Appalachian, Illinois, and Mid-Continent basins was determined to see how it varied regionally, stratigraphically, and within underclay profiles. Underclays are composed principally of kaolinite of a poorly crystallized type, illite, mixed-layer illite-montmorillonite ...
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Lithos, 2002
Abstract A fractal (power-law) distribution is the only statistical distribution applicable to a scale-invariant process. One of the major problems in petrology is the distribution of trace elements in the Earth's crust. Extreme values of this distribution result in ore deposits.
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Abstract A fractal (power-law) distribution is the only statistical distribution applicable to a scale-invariant process. One of the major problems in petrology is the distribution of trace elements in the Earth's crust. Extreme values of this distribution result in ore deposits.
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Geological Magazine, 1937
The specimens representing the Katunga lavas are compact fine-grained porphyritic rocks of lustrous stone-grey to deep blue-grey colour, the phenocrysts being olivine (up to 3 mm. long) of various tints from nearly colourless to yellow-green, and melilite (up to 2 mm.
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The specimens representing the Katunga lavas are compact fine-grained porphyritic rocks of lustrous stone-grey to deep blue-grey colour, the phenocrysts being olivine (up to 3 mm. long) of various tints from nearly colourless to yellow-green, and melilite (up to 2 mm.
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