Rock Fractures in Geological Processes

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Fracture (geology)

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Rock Fractures in Geological Processes

OK, close. Write your review. Characterisation of fractures based on scientific principles and data is thus crucial for their utilisation in resource exploration and production. Various types of fracture on a conjugate normal fault structure.

Modified from Haakon Fossen, Structural Geology Fracturing occurs at various scales from mineral to tectonic plate, and is generated in numerous forms by a number of distinct processes. Fracture is a collective term for a variety of breaks in rocks. On a mineral grain scale, fracture is crystal breakage along uneven or curved surfaces; it requires external force applied to the crystal.

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Fracture is different from crystal cleavage, the tendency of the mineral crystal to split along one or more smooth planes, which is related to the arrangement of chemical bonding in the mineral lattice. On a thin-section of rock specimen, we can observe micro-fractures which may be intragranular restricted to individual grains or intergranular cutting across several grains. In outcrops of sedimentary rocks, bedding planes and joints are probably the most eye-catching rock fractures. Bedding planes separate layers of successive sedimentary rocks due to changes in lithology or other sedimentary properties.

Joints do not show visible shearing but are dilational opening or extension fractures formed by tensile stress. Other types of extension fractures include fissures wide openings filled with air, water or other fluids , veins mineral-filled , and dykes vertical, wide fractures filled with plutonic or volcanic rock. Sheared fractures, on the other hand, show relative movement slip of two fracture walls parallel to the fracture plane slip surface.

Sheared fractures usually have displacements of millimetre to centimetre scale, while faults have larger displacements. Faults often have polished or striated surfaces called slickensides that result from frictional sliding of fault walls. Geologists can use slickenlines grooves on the fault surface to determine the direction of faulting.

Rock Fractures in Geological Processes | Agust Gudmundsson -

A geometric classification of fractures into longitudinal, transverse cross , conjugate, diagonal oblique , and orthogonal fractures developed on a fold structure. These field-based concepts were formulated by geologists in the first half of the 20th century. In the petroleum and groundwater industries, fracture often refers to reservoir-scale joints and other open, extension fractures that have positive implications for subsurface fluid flow. In this limited sense, large faults, for example, are regarded as a different feature. Faults indeed represent a significant type of fracturing and are genetically associated with many other types of fractures. Some special types of fractures are also noteworthy here.

Cleats are natural, open-mode fractures in coal beds filled with natural gas or water. Deformation bands are millimetre-wide, planar features in high-porosity sandstones that show little offset but are characterised by low-porosity, low-permeability bands rocks but they are not all the same due to mineral grain flow, fracturing or cementation; they cluster around faults. Some fractures form spectacular features on satellite images; they are also important for fluid movements on a crustal scale.

Lineaments are physiographic lines on a regional extent that indicate deformation of rocks by major faulting or folding. Ocean-floor fracture zones extend beyond the mid-ocean ridges to continental margins. Type of fracture and its infilling whether open or filled. Association of fracture with particular lithology , structure fault, fold or no structure , deformation history age , and present in-situ stress field. Home Contact us Help Free delivery worldwide. Free delivery worldwide. Bestselling Series. Harry Potter. Popular Features. New Releases. Rock Fractures in Geological Processes.

Description Rock fractures control many of Earth's dynamic processes, including plate-boundary development, tectonic earthquakes, volcanic eruptions, and fluid transport in the crust. An understanding of rock fractures is also essential for effective exploitation of natural resources such as ground water, geothermal water, and petroleum. This book combines results from fracture mechanics, materials science, rock mechanics, structural geology, hydrogeology, and fluid mechanics to explore and explain fracture processes and fluid transport in the crust.

Basic concepts are developed from first principles and illustrated with worked examples linking models of geological processes to real field observations and measurements. Many additional examples and exercises are provided online, allowing readers to practise formulating and quantitative testing of models.

Rock Fractures in Geological Processes is designed for courses at the advanced undergraduate and graduate level but also forms a vital resource for researchers and industry professionals concerned with fractures and fluid transport in the Earth's crust.

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Table of contents 1. Introduction; 2. Stress; 3. Displacement and strain; 4. Relation between stress and strain; 5. Loading of brittle rock to failure; 6. Stress concentration; 7. Theories of brittle failure of rocks; 8.