Results 251 to 260 of about 402,108 (304)

Self-sedimentation of phytoplankton blooms in the geologic record

Sedimentary Geology, 1997
Abstract Understanding the formation of laminated, organic-rich sediments is an essential topic for researchers interested in fossil fuels, biogeochemical cycles, Earth's environmental history and global change. Biologists have very recently demonstrated that some marine phytoplankton blooms actively govern their own sedimentation by the formation of
Kurt A. Grimm, Carina B. Lange, Amarpal S. Gill   +2 more
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Geological Extrapolation and Pseud-Abyssal Sediments

AAPG Bulletin, 1942
ABSTRACT It is considered conceivable that the processes of dynamical geology which are active at the present day are unlikely to have been equally dominant throughout the whole of geological history. Late Neogene time has been a period of intense orogenic activity comparable with earlier epochs of the same character like those of the
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The geological record preserved by Amazon shelf sedimentation

Continental Shelf Research, 1996
Abstract A recent study of the subaqueous delta and coastal plain near the mouth of the Amazon River provides insight to the geological record created there and elsewhere. A compound clinoform structure is forming across the Amazon shelf. The uppermost portion is the shoreline, whose aggradation brings the modern sedimentary deposit to sea level and ...
Charles A. Nittrouer, Steven A. Kuehl, Alberto G. Figueiredo, Mead A. Allison, Christopher K. Sommerfield, James M. Rine, L. Ercilio C. Faria, Odete M. Silveira   +7 more
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Appraisals of hydrocarbon potentials of sediments on geological premises

International Geology Review, 1971
Prospecting risks, in exploratory drilling for oil and gas, as in Permian and Triassic formations, in a part of the Caucasian piedmont, may be reduced significantly by preliminary analysis of the following indications: mineralogical-geochemical facies of diagenesis; associations of clay minerals; metamorphism of sediments and organic substance (table 1)
M.S. Burshtar, F.E. Okun'kova, G.I. Teodorovich   +2 more
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Comparison of Geological and Engineering Parameters of Marine Sediments

Offshore Technology Conference, 1972
Abstract Three-inch diameter piston cores collected from the Gulf of Mexico undergo a large number of geological and soil engineering tests in order to determine relationships between various physical parameters. Electrical resistivity logs are run to determine zones of interest.
Arnold H. Bouma, William E. Sweet, Wayne A. Dunlap, William R. Bryant   +3 more
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Modelling Coastal Sedimentation through Geologic Time

Journal of Coastal Research, 2005
Abstract Many deterministic numerical models accurately predict wave action and coastal flow but are unable to represent sedimentary processes over geologic times either because their basic equations and numerical implementation do not allow the sediment-water interface to change through time, or because their degree of detail makes geologic-time ...
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Phytolithic analysis of geological sediments from Panama

Antiquity, 1985
The analysis of phytoliths, microscopic pieces of silica formed within the cells of living plants, is a recent addition to archaeobotanical studies in the New World (Carbone, 1977; Pearsall, 1978; Lewis, 1981; Robinson, 1983; Piperno, 1983, 1984, in press, a; Piperno & Clary, 1984). Because these mineralized bodies are very resistant to destruction
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Micropetrography of Hydrothermal Sediment and Synergy of Microorganisms in the Geological Environment

Journal of Nanoscience and Nanotechnology, 2017
In the Jurihe area of Inner Mongolia, lamellar hydrothermal sediment of Permian was recognized. These rocks were inter-bedded with volcanic rocks, altered by hot water (hydrothermal fkuid) during the synsedimentary and quasi-synsedimentary stage. The lithogeochemistry of the rock components differ from typical sedimentary rocks.
Fanli Meng, Xiaoqi Wang, Wei Chen, Shizhen Li, Pingchang Sun, Qi Wan   +5 more
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General aspects of sedimentation in the geological basins of France

Journal of Sedimentary Research, 1950
Abstract Erosion of the crystalline rocks of the Central Massif provided the detrital material in the continental formations of the Paris basin and, during orogenically undisturbed periods, of the Rhodanian and Aquitanian basins as well. During periods of Alpine and Pyrenean diastrophism, however, sediments derived from erosion of the
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Sediments Behaviour at Basin and Geological Time Scales

61st EAGE Conference and Exhibition, 1999
Basin modelling aims to reconstruct the accumulation of hydrocarbons at basin scale, and at geological time scale, taking into account the effects of kinematics displacements, sedimentation, erosion, compaction, temperatures history, overpressures and fluids flows (water and hydrocarbons).
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