study of the composition of rock-gouge in fractures of Finnish Precambrian bedrock

study of the composition of rock-gouge in fractures of Finnish Precambrian bedrock by Raimo Uusinoka Download PDF EPUB FB2

A study of the composition of rock-gouge in fractures in Finnish Precambrian bedrock, Helsinki, Societas Scientiarum Fennica. Comment Phys-Mathe ; 45(1).

Google ScholarCited by:   One hundred samples of soft, clayey material taken from bedrock fractures and veins in different parts of Finland have been subjected to X-ray analysis, and 50 of the samples also to a free swelling test (10 cm3 of air-dried clay was placed in a 50 cm3 cylinder filled with distilled water).

The free swelling of the samples ranged from zero (i.e. from 10 cm3) to 31 : R. Uusinoka, R. Alkio. In this study we investigated fungal communities in packer-isolated bedrock fractures in Olkiluoto, Finland at depths ranging from to m below surface level.

A study of the composition of rock-gouge in fractures in Finnish Precambrian bedrock, Helsinki, Societas Scientiarum Fennica A study of the composition of rock-gouge in fractures in Finnish.

Abstract. There is uncertainty when modelling geological structures located in Precambrian crystalline bedrock. In Finland and Sweden this is typically granite or gneiss in composition and subjected to polyphase : Pauli Saksa, Pirjo Hellä, Jorma Nummela. A study of the composition of rock-gouge in fractures of Finnish Precambrian bedrock.

Commentationes Physico-Mathematicae, Societas Scientiarum Fennica. 45 (1). France. The meteorite impact which created the Lappajärvi crater produced a series of rocks which differ significantly from the unshocked Precambrian bedrock in the surroundings.

Kärnäites (impact melt), suevites and impact breccias are characterized by increased total and effective porosity (including pores, vesicules and fractures). The bacterial and archaeal community composition and the possible carbon assimilation processes and energy sources of microbial communities in oligotrophic, deep, crystalline bedrock fractures is.

[1] The role of bedrock fractures and rock mass strength is often considered a primary influence on the efficiency of surface study of the composition of rock-gouge in fractures of Finnish Precambrian bedrock book and the morphology of landscapes.

Quantifying bedrock characteristics at hillslope scales, however, has proven difficult. Here, we present a new field‐based method for quantifying the depth and apparent density of bedrock fractures within the shallow.

•Bedrock Focus •Fracture Trace Analysis •Resistivity Surveys •Focused Drilling for bedrock wells on fractures/conduits •18 of 19 drilled on fractures •Central facility v. exit pathway wells •Thermal survey along river confirmed exit points •To complete RI, characterization approach required focus on the fractured nature bedrock.

Blomqvist's 27 research works with citations and reads, including: Deep Fluids in the Continents. The Outokumpu Deep Drill Hole in Eastern Finland spans m in Precambrian bedrock and has several fracture systems at different depths.

chemical composition of fracture waters, and. Filter analysis of lineaments in Precambrian metamorphic rocks was used to delineate fracture-correlated lineaments and hydraulically significant fractures.

The unfiltered analysis technique fails to show correlation between major lineaments and fractures. Domain-based and discrete filtering techniques successfully identify fracture-correlated lineaments within the brittle-ductile shear zone.

Abstract. Location of recharge zone in Precambrian crystalline rock is still unclear. The present study attempts to perform a detailed analysis of the joints/fractures developed in a Precambrian metamorphic terrain in and around Balarampur in Purulia district of West Bengal, India using bedrock data.

The Outokumpu deep scientific drill hole, located in Eastern Finland, hosts a unique environment piercing through crystalline Precambrian bedrock and its numerous saline fluid filled fracture zones. The composition of the microbial communities and the geochemical characteristics of the Outokumpu deep subsurface have been studied in detail [   Abstract.

Fractured sedimentary rock contains two domains, the fractures and adjoining rock matrix. Fractures often provide most of the aquifer transmissivity, whereas the bulk of water and solute storage may occur in the matrix.

The increased attention paid to experimental rock fracture mechanics has led to major contributions to the solving of geophysical problems. The text presents a concise treatment of the physics and mathematics of a representative selection of problems from areas such as earthquake mechanics and prediction, hydraulic fracturing, hot dry rock.

The Precambrian crust of the Baltic Shield developed during four orogenies between and Ga ago, and exhibits a general westward younging of major crustal units. Later orogenies contributed little new material to the shield but involved intense crustal reworking in western Scandinavia, particularly during the Sveconorwegian‐Grenvillian.

Lanru Jing, Ove Stephansson, in Developments in Geotechnical Engineering, Summary remarks on outstanding issues. Coupling processes in rock fractures becomes an important outstanding issue and will be addressed at the end of Chapter 4 after the flow problems in rock fractures are presented.

In summary, although tremendous efforts have been made to develop constitutive models. bedrock fractures to the magnitude of deep‐seated bedrock landslides.

Background and Study Area [7] The Southern Alps and Fiordland, both located on the western coast of the South Island of New Zealand (Figure 1), have formed due to the ongoing, oblique convergence of. Rock fractures are typically rough-walled, and fracture surface roughness has significant impact on fluid flow and transport processes in single fractures.

In other words, the mechanical aperture of a rock fracture is usually larger than its hydraulic aperture. However, the effects of this reduced hydraulic aperture (due to roughness) in local fractures on macroscopic fluid flow and solute.

Abstract – A retrospective study was undertaken to assess causes of maxillofacial fractures in Helsinki in and Hospital records of patients were analyzed according to several factors including age, sex, cause of fracture and time of the injury. The time intervals between the accident and hospital examination were also evaluated.

The deep bedrock surroundings are an analog for extraterrestrial habitats for life. In this study, we investigated microbial life within anoxic ultradeep boreholes in Precambrian bedrock, including the adaptation to environmental conditions and lifestyle of these organisms.

Samples were collected from Pyhäsalmi mine environment in central Finland and from geothermal drilling wells in Otaniemi. To understand the influence of these parameters, a systematic study was carried out numerically on different fracture geometries.

In this paper, two-dimensional fractures with different surface roughness were simulated in a finite-element modeling (FEM) program. A study of composition of rock-gouge in fractures of Finnish Precambrian bedrock.

Commentationes Physico-Mathematicae Societas Scientiarum Fennica, 45 (1). Fracture Surfaces A new trend in bedrock research is the examination of fracture skins or weathering rinds (i.e., the rock surfaces immediately adjacent to the ground water flowing in a fracture).

These surfaces appear to be colorized by adherent microbes that may play a role in the geochemistry within the fractures, particularly in small (micro).

In this study, the occurrence, composition, microscopic structure and age of the fracture fillings was investigated in order to estimate the environment and time of precipitation. STUDY AREA Yakushima Island Yakushima is an almost circular island having a.

A study of the composition of rock-gouge in fractures of Finnish Precambrian bedrock. Commentationes Physico-Mathematicae, Societas Scientiarum Fennica. 45 (1). List of minerals arranged by Strunz 10th Edition classification. Consensus Study Report: Consensus Study Reports published by the National Academies of Sciences, Engineering, and Medicine document the evidence-based consensus on the study’s statement of task by an authoring committee of s typically include findings, conclusions, and recommendations based on information gathered by the committee and the committee’s deliberations.

Fractures are mechanical breaks in rocks; they originate from strains that arise from stress concentrations around flaws, heterogeneities, and physical form in response to lithostatic, tectonic, and thermal stresses and high fluid pressures.

They occur at a variety of scales, from microscopic to continental. The fractured bedrock structural features are shown in Figure Figure Fractured bedrock structural features for study site.

Note that the green parallel lines are bedding and bed parallel fractures (dipping 45°N), purple are slatey cleavage (dipping 60°S) and pale blue are a low angle open fracture .Remediation of fractured bedrock is complicated by the difficulty in characterizing the flow system, the potential for small aperture fractures that restrict flow, dead end fractures that become contaminant sinks, and for some rock systems, primary porosity that allows diffusion into the rock matrix.Crystalline bedrock has been chosen for deep geologic long-term storage of used nuclear fuel in Finland.

The risks generated by the deep subsurface microbial communities in these disposal sites need to be well characterised in advance to ensure safety. Deep subsurface microbial communities in a steady state are unlikely to contribute to known risk factors, such as corrosion or gas production.