Stratigraphic Studies

Armstrong, J.E. 1976. Quaternary geology, stratigraphic studies and revaluation of terrain inventory maps, Fraser Lowland, British Columbia. Geological Survey of Canada, Paper 75-1, Part A, 377-380. Bowell, R.J. 1994. Sorption of arsenic by iron oxides and oxyhydroxides in soils. Applied Geochemistry, 9, 279-286. 

Volcanological and stratigraphic studies (e.g. Keller 1980b De Astis et al. 1997) allowed identification of various stages of volcanic activity (Fig. 7.11). Primordial Vulcano (120 to 100 ka) and Piano Caldera (100 and 20 ka) are a composite cone and a filled caldera, mostly formed by HKCA mafic to intermediate lava flows, pyroclastic rocks and dikes. The Lentia... 

The importance of stratigraphic studies and the identification of sedimentary units at extensively disrupted sites like Hierakonpolis can be illustrated by the excavations at locality II, where there is evidence for habitation (trash mounds and pottery) as well as industry (pottery kilns). This locality ofiered a unique opportunity to study Predynastic ecology because of the excellent state of organic preservation in an area where there was a clustering of multi-functional components (6,14). Four test pits were dug in one area through the site, in the direction NIO °E-SIO °W. The correlation profile is shown in Figure I. The oldest unit identified was Nile silt (Masmas formation). In some areas, this silt was covered by eolian and/or wadi sands, which probably represents a local feature of sand accumulation under arid to semiarid conditions. 

Analysis of the RFT-data combined with detailed sequence stratigraphic studies were performed to obtain representative pore-pressure gradients from top to base of the individual permeable sands. Fig. 7 shows the interpreted pressure gradients for the Juras-sic-Triassic sequences within hydraulic compartment I based on RFT data from wells 10-1 and 10-2. Figs. 8 and 10 illustrate the same for hydraulic compartment II (based on wells 7-1, 7-2 and 7-4) and hydraulic compartment III (based on wells 7-3 and 7-5) respectively. 

Denison RE, Hetherington EA, Bishop BA, Dahl DA, Koepnick RB (1993) The use of strontium isotopes in stratigraphic studies an example from North Carolina. Southeastern Geol 33 53-69 DePaolo DJ, Ingram BL (1985) High-resolution stratigraphy with strontium isotopes. Science 227 938-941 Dickens GR (1999) The blast in the past. Nature 401 752-753, 755... 

The return periods of particular types of activity of individual volcanoes or centres of volcanic activity can be obtained by thorough stratigraphical study and dating of the associated deposits so as to reconstruct past events. Used in conjunction with any available historical... 

Voros, A. (1983) The Pliensbachian brachiopods of the Bakony Mrs. (Hungary) a stratigraphical study. Fragmenta Mineralogica et Falaeontologica, 11, 29-39. 

Seismic studies are very useful when information is lacking on subsurface stratigraphy, or when the depth to bedrock, the water table, a particular bed or formation, or some other layer in the subsurface must be determined without drilling. Seismic lines can be set up to produce stratigraphic cross sections and they can be a very useful "non-invasive" inves-... 

Marutani and Takenouchi (1978) clarified the variations in homogenization temperature and salinity of inclusion fluids in quartz from stockwork siliceous orebodies at the Kosaka mine (Fig. 1.35 Urabe, 1978). They showed that the temperature decreases stratigraphically upwards from stockwork ore zone (280-320°C) to bedded ore zone (260-310°C). Pisutha-Arnond and Ohmoto (1983) carried out fluid inclusion studies of the stockwork siliceous ores from five Kuroko deposits (Kosaka, Fukazawa, Furutobe, Shakanai, and Matsumine) and revealed that black ore minerals (sphalerite, galena, barite) and yellow ore minerals (chalcopyrite, quartz) formed at 200-330°C and 330 50°C, respectively, and salinities of the ore fluids remained fairly constant at about 3.5-6 equivalent wt% NaCl. They analyzed fluids extracted from sulfides and quartz Na = 0.60 0.16 (mol/kg H2O), K = 0.08 0.05, Ca = 0.06 0.05, Mg = 0.013 0.008, Cl = 0.82 0.32, C (as CO2) = 0.20 0.15 and less than 6 ppm each for Cu, Pb, Zn and Fe. 

Shikazono (1985a) has studied hydrothermal alterations in the epithermal Au-Ag mine district in Izu Penin.sula, middle part of Honshu, and indicated that (1) the propylitic alteration occurs widely in the district (2) at the centre of the district and stratigraphically upper horizon, there exists advanced argillic alteration (3) epithermal Au-Ag vein-type deposits are distributed at marginal zone in the district (Fig. 1.125) ... 

Horii, K. (1971) A study on Kosaka Uwamuki deposits. Graduation Thesis, Hokkaido U. (in Japanese). Horikoshi, E. (1960) The stratigraphical horizon of the Kuroko deposits in Hanaoka-Kosaka area. Green Tuff district of Japan. Mining Geology, 10, 300-310 (in Japanese). 

U.S. EPA. Preliminary study of selected potential environmental contaminants - Optical brighteners, methyl chloroform, trichloroethylene, tetrachloroethylene, ion exchange resins. Office of Toxic Snbstances, Report 560/2-75-002,1975,286 p. U.S. EPA. Report on the problem of halogenated air pollntants and stratigraphic ozone. Office of Research and Development, Report-600/9-75-008, 1975a, 55 p. 

This study was undertaken to document the geometry, stratigraphic position of sulfide mineralization, and... 

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