- Email: [email protected]
A suggested method for describing the rate of movement of a landslide
241A
GEOLOGY General 966001 Sandstone hosted gold deposits: a new exploration target is recognized in Peru D. E. Montoya, D. C. Noble, V. R. Eyzaguirre & D. F. DesRosiers, Engineering & Mining Journal, 196(5), 1995, pp 34-41. This article is a preliminary description of a distinctive type of distal sandstone-hosted hydrothermal gold deposit found in the Andes of northern Peru. Total gold potential of these deposits may rival that of the volcanic-hosted, bulk mineable deposits. Examples of this include Carachugo and Tantahuatay, which formed in nearby areas during the same period of Neogene ma~ynatic activity and metaUogenesis. In particular, Santa Rosa and E1 Tort may prove to be world-class deposits. (Authors)
Tectonics and structural geology 966002 Structural analysis for folded deposits M. J. Newton, Mining Magazine, 173(2), 1995, pp 83,85. Most methods of reserve evaluation involve measuring the distance between each sample and the reserve block. In a geostatistical evaluation the azimuth and dip of each sample relative to the reserve block and relative to other samples are also required. These measurements are usually made in the standard Cartesian XYZ coordinate system. However for a fold deposit, where mineralisation has occurred pre-folding, what is really required is a line measured in the prefolded orebody. A new technique for unfolding has been developed which has been integrated into the DATAMINE modelling and mine planning system. It provides a flexible method which can be applied to both simple and complex situations. (from Author) 966003 Microstrain stability of Peninsular India 1864-1994 J. Paul & 10 others, Proceedings - Indian Academy of Sciences, Earth & Planetary Sciences, 104(1), 1995, pp 131146. Reports the results of the South Indian Strain Measuring Experiment (SISME) designed to determine whether strain related to microseismicity in the past century may have deformed the networks of the 19th century Great Trigonometrical survey of India (GTS). More than a dozen GTS points were measured in southernmost India using GPS geodesy to determine regional deformation. The regional measurements revealed negligible regional dilatational (+ 11.2 _ 10 microstrain) and shear strain changes (0.66 + 1.2 ~tradians) in the southernmost (530 km of India. The rate of northward and eastward motion of a point in Bangalore (I 991-1994) in the ITRF92 reference frame was determined to be 39 + 3.5 mm/year, and 51 + 11 mm/year respectively. This is consistent with NUVEL-IA plate motion estimate for India. Simultaneous measurements to a point near Kathmandu reveal that the Indian plate and the Southern Himalaya are moving approximately in unison, placing an upper limit on the rate of creep processes beneath the lesser Himalaya of ~ 6 mm/year, and suggesting relatively rigid behavior of the Indian plate north of Bangalore. (from Authors) 966004 Coalification pattern of Jixi coalfield (in Chinese) Hu Shanting, Yang Qi & Pan Zhigui, Journal - China Coal Society, 20(6), 1995, pp 561-565. Evolution characteristics of metamorphism in the northern coal belt are discussed. The hypometamorphism can be divided into persistent depositional metamorphism, inversion
folding metamorphism and post-inversion folding metamorphism. In terms of the depth of the magrnatic intrusion, the telemagmatic thermal metamorphism can be divided into hypabyssal and mesozone magmatic metamorphism. The former is related to the path-way of magraatic hydrothermal solution and the latter is related to the distance between the coal measures and the magmatie body. The hypometamorphism brought about the normal coal metamorphism and the telemagrnatic thermal metamorphism the medium and high rank bituminous coal. (English summary)
Environmental effects 966005 A suggested method for describing the rate of movement of a landslide ANON (International Union of Geological Sciences Working Group on Landslides), Bulletin - International Association of Engineering Geology, 52, 1995, pp 75-78. The rate of movement of a landslide can range from extremely slow, less than 16 mm/year or 0.5 x 10-6 mm/ second, to extremely rapid, over 5 m/second. Five intermediate classes cover two orders of magnitude of velocity each. The velocity of a landslide can be correlated with the damage it may cause. (Authors) 966006 Sea cliff erosion caused by a storm drain failure R. W. Day & D. M. Poland, Environmental & Engineering Geoscience, 1(4), 1995, pp 524-529. The purpose of this paper is to describe man-induced effects that increase sea cliff erosion. In particular, a case study of the failure of a storm drain system will be discussed. Typical erosion control devices used to mitigate sea cliff erosion will first be described. (from Authors) 966007
Snow and avalanches. Proceedings of the European Summer University on natural hazards, Chamonix, France, September 1992 ed G. Brugnot, (Cemagref), ISBN (paperback) 2 85362 397 l, price £51.00 (US$85.00, FF385.00), 1995, 407 pp. This book covers a number of areas of research into the risks caused by avalanches. The first section details the events of 12-17 February 1990, a period of high avalance activity in the North Alps. Subsequent sections assess: the properties of the snow cover; avalanche dynamics; avalanche forecasting; avalanche zoning; winter access along mountain roads; use of computer models for avalanche risk forecasting; risk management; protection measures; and the artificial release of avalanches. (L.E.Evans) 966008 The Edgerton landslides D. M. Cruden, S. Thomson, H. J. Kim & A. E. Peterson, Canadian Geotechnical Journal, 32(6), 1995, pp 989-I001. Observations over 20 years of three contiguous translational slides on the west wall of a 100 m deep valley in the Interior Plains document their evolution into advancing, composite, slow earth-flow earth-slides involving over a million cubic metres of displaced material. The reactivation of the abandoned slides in the Upper Cretaceous sedimentary rocks was likely triggered by years of higher than average precipitation following clearing of brush behind the crest of the slope. (Authors) 966009 Slope failures in southern California: rainfall threshold, prediction, and human causes J. E. Siosson & R. A. Larson, Environmental & Engineering Geoscience, I(4), 1995, pp 393-401. Rainfall during the winter of 1992-1993 reached 195% of normal and caused landslides and mudflow/debris flows reminiscent of previous wet years when the rainfall exceeded
GEOLOGY General 966001 Sandstone hosted gold deposits: a new exploration target is recognized in Peru D. E. Montoya, D. C. Noble, V. R. Eyzaguirre & D. F. DesRosiers, Engineering & Mining Journal, 196(5), 1995, pp 34-41. This article is a preliminary description of a distinctive type of distal sandstone-hosted hydrothermal gold deposit found in the Andes of northern Peru. Total gold potential of these deposits may rival that of the volcanic-hosted, bulk mineable deposits. Examples of this include Carachugo and Tantahuatay, which formed in nearby areas during the same period of Neogene ma~ynatic activity and metaUogenesis. In particular, Santa Rosa and E1 Tort may prove to be world-class deposits. (Authors)
Tectonics and structural geology 966002 Structural analysis for folded deposits M. J. Newton, Mining Magazine, 173(2), 1995, pp 83,85. Most methods of reserve evaluation involve measuring the distance between each sample and the reserve block. In a geostatistical evaluation the azimuth and dip of each sample relative to the reserve block and relative to other samples are also required. These measurements are usually made in the standard Cartesian XYZ coordinate system. However for a fold deposit, where mineralisation has occurred pre-folding, what is really required is a line measured in the prefolded orebody. A new technique for unfolding has been developed which has been integrated into the DATAMINE modelling and mine planning system. It provides a flexible method which can be applied to both simple and complex situations. (from Author) 966003 Microstrain stability of Peninsular India 1864-1994 J. Paul & 10 others, Proceedings - Indian Academy of Sciences, Earth & Planetary Sciences, 104(1), 1995, pp 131146. Reports the results of the South Indian Strain Measuring Experiment (SISME) designed to determine whether strain related to microseismicity in the past century may have deformed the networks of the 19th century Great Trigonometrical survey of India (GTS). More than a dozen GTS points were measured in southernmost India using GPS geodesy to determine regional deformation. The regional measurements revealed negligible regional dilatational (+ 11.2 _ 10 microstrain) and shear strain changes (0.66 + 1.2 ~tradians) in the southernmost (530 km of India. The rate of northward and eastward motion of a point in Bangalore (I 991-1994) in the ITRF92 reference frame was determined to be 39 + 3.5 mm/year, and 51 + 11 mm/year respectively. This is consistent with NUVEL-IA plate motion estimate for India. Simultaneous measurements to a point near Kathmandu reveal that the Indian plate and the Southern Himalaya are moving approximately in unison, placing an upper limit on the rate of creep processes beneath the lesser Himalaya of ~ 6 mm/year, and suggesting relatively rigid behavior of the Indian plate north of Bangalore. (from Authors) 966004 Coalification pattern of Jixi coalfield (in Chinese) Hu Shanting, Yang Qi & Pan Zhigui, Journal - China Coal Society, 20(6), 1995, pp 561-565. Evolution characteristics of metamorphism in the northern coal belt are discussed. The hypometamorphism can be divided into persistent depositional metamorphism, inversion
folding metamorphism and post-inversion folding metamorphism. In terms of the depth of the magrnatic intrusion, the telemagmatic thermal metamorphism can be divided into hypabyssal and mesozone magmatic metamorphism. The former is related to the path-way of magraatic hydrothermal solution and the latter is related to the distance between the coal measures and the magmatie body. The hypometamorphism brought about the normal coal metamorphism and the telemagrnatic thermal metamorphism the medium and high rank bituminous coal. (English summary)
Environmental effects 966005 A suggested method for describing the rate of movement of a landslide ANON (International Union of Geological Sciences Working Group on Landslides), Bulletin - International Association of Engineering Geology, 52, 1995, pp 75-78. The rate of movement of a landslide can range from extremely slow, less than 16 mm/year or 0.5 x 10-6 mm/ second, to extremely rapid, over 5 m/second. Five intermediate classes cover two orders of magnitude of velocity each. The velocity of a landslide can be correlated with the damage it may cause. (Authors) 966006 Sea cliff erosion caused by a storm drain failure R. W. Day & D. M. Poland, Environmental & Engineering Geoscience, 1(4), 1995, pp 524-529. The purpose of this paper is to describe man-induced effects that increase sea cliff erosion. In particular, a case study of the failure of a storm drain system will be discussed. Typical erosion control devices used to mitigate sea cliff erosion will first be described. (from Authors) 966007
Snow and avalanches. Proceedings of the European Summer University on natural hazards, Chamonix, France, September 1992 ed G. Brugnot, (Cemagref), ISBN (paperback) 2 85362 397 l, price £51.00 (US$85.00, FF385.00), 1995, 407 pp. This book covers a number of areas of research into the risks caused by avalanches. The first section details the events of 12-17 February 1990, a period of high avalance activity in the North Alps. Subsequent sections assess: the properties of the snow cover; avalanche dynamics; avalanche forecasting; avalanche zoning; winter access along mountain roads; use of computer models for avalanche risk forecasting; risk management; protection measures; and the artificial release of avalanches. (L.E.Evans) 966008 The Edgerton landslides D. M. Cruden, S. Thomson, H. J. Kim & A. E. Peterson, Canadian Geotechnical Journal, 32(6), 1995, pp 989-I001. Observations over 20 years of three contiguous translational slides on the west wall of a 100 m deep valley in the Interior Plains document their evolution into advancing, composite, slow earth-flow earth-slides involving over a million cubic metres of displaced material. The reactivation of the abandoned slides in the Upper Cretaceous sedimentary rocks was likely triggered by years of higher than average precipitation following clearing of brush behind the crest of the slope. (Authors) 966009 Slope failures in southern California: rainfall threshold, prediction, and human causes J. E. Siosson & R. A. Larson, Environmental & Engineering Geoscience, I(4), 1995, pp 393-401. Rainfall during the winter of 1992-1993 reached 195% of normal and caused landslides and mudflow/debris flows reminiscent of previous wet years when the rainfall exceeded