- Email: [email protected]
Some observations on the chemical weathering of the Dartmoor granite
46A Failure mechanisms examined included wedge failure of large masses and surficial shearing (slabbing failure). Results of analyses agree closely with field observations.
872008 Some observations on the chemical weathering of the Dartmoor granite Williams. A G; Ternan. L: Kent. M
Earth Surf Process Land Vl l. A~. Sept-Oct 1986, P557-574 Chemical weathering of granite in the Narrator basin on the southwestern margin of Dartmoor has been studied using a combination of systematic analysis of drainage water and detailed mineralogical analysis of the remnant rock/soil mass. Weathering is seen to be an active and continuing process, and to be a highly localised, topography-dependent phenomenon.
872009 Coordinative interactions between soil solids and water - an aquatic chemist's point of view Stumm, W
Geoderma 1/38. NI-4, Sept 1986,P19-30 Processes occurring at the hydrous surfaces of oxide components of rocks and soils are of importance in phenomena such as weathering or soil and sediment formation. The rates of these processes are critically dependent on the coordinative reactions taking place on these surfaces. Rate laws for heterogeneous nucleation, dissolution of oxides and weathering reactions are derived.
872010 Todorokite, goethite, and haemetite: alteration products of siderite in East Texas lignite overburden Senkayi. A L; Dixon, J B; Hossner, L R
Earthquake mechanisms and effects See also." 872113
872012 Inversion of the geodetic data and seismicity associated with the Friuli earthquake sequence(1976-1977) Briole, P: De Natale, G: Gaulon, R; Pingue, F: Scarpa, R Ann Geophys V4, N4B. A,~g I986. P481-492 A faulting model of the Friuli earthquake sequence was derived by inversion of measured ground movement data, using the elastic dislocation theory and a source model consisting of three rectangular faults, as suggested by seismological investigations. Two analytical methods used gave consistent results. Shallow thrust faults dipping to the N N W ruptured from east to west during the long sequence.
872013 Index for measuring the effects of topography on seismic ground motion intensity Sanchez-Sesma, F J; Faccioli, E; Fregonese, R
Earthq Engng Struct Dynam V14, N5, Sept-Oct 1986, P719731 The Topographical Effects Index (TEl) is proposed for the qualitative evaluation of topographical effects, as may be required by seismic microzoning or structural design applications. It is defined as the relative Arias intensity at a given point. The TEl is calculated for the case of a semicircular canyon excited by an earthquake signal consisting of plane elastic S waves. The behaviour and spatial distribution of TEIs are illustrated for different angles of incidence and spectral parameters.
Soil Sci V142, NI, July 1986, P36-42 The weathering of siderite, which contains 1-30 Mn, from lignite overburden was studied by x-ray diffraction, and optical and electron microscopy. Under typical surface conditions, the formation of hydroxylated phases of todorokite and geothite is favoured, rather than nonhydroxylated haemetite. Todorokite is an unstable transient mineral, which could dissolve and release potentially toxic levels of Mn, which may have drastic effects on the reclamation of these strip mined areas.
872011 Irregular topography of the subsurface carbonate bedrock in the Kuala Lumpur area Yeap, E B Proc 8th Southeast Asian Geotechnical Conference, Kuala
Lumpur, ~tlalaysia, 11-15 March 1985 V1, P4/1-12. Publ Kuala Lumpur: Organising Committee. 1986 Buried karstic surfaces of dolomitic and calcitic marble bedrock have been investigated. Evidence suggests these surfaces developed beneath a permeable soil cover, which was eroded before the present tin bearing alluvium was deposited. Surface observations in gravel pump mines have allowed six separate forms of karstic feature to be identified. These may be used as a basis for interpretation of buried karstic surfaces encountered in foundation investigation.
872014 Rotational components of the surface ground motion during an earthquake Castellani, A; Boffi, G Earthq Engng Struct Dynam II14, ;\\L Sept-Oct 1986, P751-
767 Assuming an immovable point source for earthquake energy release, a mathematical model is developed to compute the free field surface rotation constant with assigned translational components. Events recorded by the SMART-1 array, Taiwan, provide the only input data of sufficient quality for evaluation by this model. Earthquake response spectra are calculated, and measured and predicted rotational motions are in qualitative agreement. Correlations between the translational and rotational components of ground motion are shown.
Hydrogeology See: 872125
© 1986 Pergamon Journals Ltd. Reproduction not permitted
872008 Some observations on the chemical weathering of the Dartmoor granite Williams. A G; Ternan. L: Kent. M
Earth Surf Process Land Vl l. A~. Sept-Oct 1986, P557-574 Chemical weathering of granite in the Narrator basin on the southwestern margin of Dartmoor has been studied using a combination of systematic analysis of drainage water and detailed mineralogical analysis of the remnant rock/soil mass. Weathering is seen to be an active and continuing process, and to be a highly localised, topography-dependent phenomenon.
872009 Coordinative interactions between soil solids and water - an aquatic chemist's point of view Stumm, W
Geoderma 1/38. NI-4, Sept 1986,P19-30 Processes occurring at the hydrous surfaces of oxide components of rocks and soils are of importance in phenomena such as weathering or soil and sediment formation. The rates of these processes are critically dependent on the coordinative reactions taking place on these surfaces. Rate laws for heterogeneous nucleation, dissolution of oxides and weathering reactions are derived.
872010 Todorokite, goethite, and haemetite: alteration products of siderite in East Texas lignite overburden Senkayi. A L; Dixon, J B; Hossner, L R
Earthquake mechanisms and effects See also." 872113
872012 Inversion of the geodetic data and seismicity associated with the Friuli earthquake sequence(1976-1977) Briole, P: De Natale, G: Gaulon, R; Pingue, F: Scarpa, R Ann Geophys V4, N4B. A,~g I986. P481-492 A faulting model of the Friuli earthquake sequence was derived by inversion of measured ground movement data, using the elastic dislocation theory and a source model consisting of three rectangular faults, as suggested by seismological investigations. Two analytical methods used gave consistent results. Shallow thrust faults dipping to the N N W ruptured from east to west during the long sequence.
872013 Index for measuring the effects of topography on seismic ground motion intensity Sanchez-Sesma, F J; Faccioli, E; Fregonese, R
Earthq Engng Struct Dynam V14, N5, Sept-Oct 1986, P719731 The Topographical Effects Index (TEl) is proposed for the qualitative evaluation of topographical effects, as may be required by seismic microzoning or structural design applications. It is defined as the relative Arias intensity at a given point. The TEl is calculated for the case of a semicircular canyon excited by an earthquake signal consisting of plane elastic S waves. The behaviour and spatial distribution of TEIs are illustrated for different angles of incidence and spectral parameters.
Soil Sci V142, NI, July 1986, P36-42 The weathering of siderite, which contains 1-30 Mn, from lignite overburden was studied by x-ray diffraction, and optical and electron microscopy. Under typical surface conditions, the formation of hydroxylated phases of todorokite and geothite is favoured, rather than nonhydroxylated haemetite. Todorokite is an unstable transient mineral, which could dissolve and release potentially toxic levels of Mn, which may have drastic effects on the reclamation of these strip mined areas.
872011 Irregular topography of the subsurface carbonate bedrock in the Kuala Lumpur area Yeap, E B Proc 8th Southeast Asian Geotechnical Conference, Kuala
Lumpur, ~tlalaysia, 11-15 March 1985 V1, P4/1-12. Publ Kuala Lumpur: Organising Committee. 1986 Buried karstic surfaces of dolomitic and calcitic marble bedrock have been investigated. Evidence suggests these surfaces developed beneath a permeable soil cover, which was eroded before the present tin bearing alluvium was deposited. Surface observations in gravel pump mines have allowed six separate forms of karstic feature to be identified. These may be used as a basis for interpretation of buried karstic surfaces encountered in foundation investigation.
872014 Rotational components of the surface ground motion during an earthquake Castellani, A; Boffi, G Earthq Engng Struct Dynam II14, ;\\L Sept-Oct 1986, P751-
767 Assuming an immovable point source for earthquake energy release, a mathematical model is developed to compute the free field surface rotation constant with assigned translational components. Events recorded by the SMART-1 array, Taiwan, provide the only input data of sufficient quality for evaluation by this model. Earthquake response spectra are calculated, and measured and predicted rotational motions are in qualitative agreement. Correlations between the translational and rotational components of ground motion are shown.
Hydrogeology See: 872125
© 1986 Pergamon Journals Ltd. Reproduction not permitted