Electron Microscopy Investigation of the Microstructure in Sediment Samples from the Gulf of Mexico PDF Download
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Author: Texas A & M University. Department of Oceanography
Publisher:
ISBN:
Category : Electron microscopy
Languages : en
Pages : 232
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Book Description
Sediment samples were taken from Gulf of Mexico cores. From these samples smaller ones were cut, freeze-dried and impregnated with Maraglas, an epoxy resin. Ultrathin sections of the impregnated samples were cut, and viewed in an electron microscope. Micrographs of the ultrathin sections revealed that the microstructures of most of the samples had a loose, open, random arrangement of particles. Differences in appearance of some of the microstructures are attributed to grain size variation, desiccation, remolding, and shearing of the sediment. Associated with this last factor is the formation of oriented domain structures. Variations among the samples in depth of burial, rate of deposition, and, particularly, clay mineralogy were generally small and resulted in no obvious differences in their microstructures. Cohesion, water content, and consolidation characteristics of samples were found to be generally indicative of the type of microstructure observed. Laboratory consolidation and desiccation of samples caused a 'collapse' of the microstructure and preferred, as well as non-preferred, orientation among the particles. Remolding of a sediment resulted in clumping of the particles, parallelism among the particles, and large voids. No evidence was observed in the micrographs which would substantiate the existence of a precipitated chemical cement. (Author).
Author: Texas A & M University. Department of Oceanography
Publisher:
ISBN:
Category : Electron microscopy
Languages : en
Pages : 232
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Book Description
Sediment samples were taken from Gulf of Mexico cores. From these samples smaller ones were cut, freeze-dried and impregnated with Maraglas, an epoxy resin. Ultrathin sections of the impregnated samples were cut, and viewed in an electron microscope. Micrographs of the ultrathin sections revealed that the microstructures of most of the samples had a loose, open, random arrangement of particles. Differences in appearance of some of the microstructures are attributed to grain size variation, desiccation, remolding, and shearing of the sediment. Associated with this last factor is the formation of oriented domain structures. Variations among the samples in depth of burial, rate of deposition, and, particularly, clay mineralogy were generally small and resulted in no obvious differences in their microstructures. Cohesion, water content, and consolidation characteristics of samples were found to be generally indicative of the type of microstructure observed. Laboratory consolidation and desiccation of samples caused a 'collapse' of the microstructure and preferred, as well as non-preferred, orientation among the particles. Remolding of a sediment resulted in clumping of the particles, parallelism among the particles, and large voids. No evidence was observed in the micrographs which would substantiate the existence of a precipitated chemical cement. (Author).
Author: W.A. Chiou
Publisher: Springer Science & Business Media
ISBN: 1461244285
Category : Science
Languages : en
Pages : 570
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Book Description
Knowledge of basic clay microstructure is fundamental to an understanding of the physical, chemical, and mechanical properties of fine-grained sediments and rocks. This compilation of fifty-nine peer-reviewed papers examines clay microstructure in detail with comprehensive sections focusing on microstructure signatures, environmental processes, modeling, measurement techniques, and future research recommendations. Many of these topics are discussed in light of geological and engineering applications, such as hazardous waste disposal, construction techniques, and drilling programs. The field of clay microstructure is developing rapidly. The concepts, observations, and principles presented in this book will help stimulate new thought and be a "spring board" for exciting new research.
Author: United States. National Oceanic and Atmospheric Administration
Publisher:
ISBN:
Category :
Languages : en
Pages : 472
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Author:
Publisher:
ISBN:
Category : Geophysics
Languages : en
Pages : 262
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Author:
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ISBN:
Category : Marine meteorology
Languages : en
Pages : 572
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Author: Richard Bennett
Publisher: Springer Science & Business Media
ISBN: 9400946848
Category : Science
Languages : en
Pages : 163
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Book Description
Plan of Review This review of clay microstructure is aimed at the diverse group of professionals who share an interest in the properties of fine-grained minerals in sediments. During the last several decades, members of this group have included geologists, soil scientists, soil engineers, engineering geologists, and ceramics scientists. More recently, it has included significant numbers of marine geologists and other engineers. Each of the disciplines has developed special techniques for investigating properties of clay sediments that have proven to be fruitful in answering questions of central interest. Knowledge of clay microstructure-the fabric of a sediment and the physico chemical interactions between its components-is fundamental to all these disciplines (Mitchell 1956; Lambe 1958a; Foster and De 1971). Clay fabric refers to the spatial distribution, orientations, and particle-to-particle relations of the solid particles (generally those less than 3. 9 /Lm in size) of sediment. Physico-chemical interac tions are expressions of the forces between the particles. In this review, we trace the historical development of under standing clay microstructure by discussing key scientific papers published before 1986 on physico-chemical interactions in fine grained sediments and on clay fabric. Since the development follows an intricate path, the current view of clay microstructure is summarized. This summary includes a discussion of the present state of knowledge, the observations made so far, and the facts that are now established.
Author:
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 1492
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Author: Peter Smart
Publisher: Oxford University Press, USA
ISBN:
Category : Science
Languages : en
Pages : 296
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Book Description
Concerned mainly with the preparation of samples and the interpretation of electron micrographs, whether of undisturbed samples, or of samples that have been deformed under laboratory conditions. The difficulties that arise in preparing undamaged samples for electron microscopy are discussed.
Author:
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 1080
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Book Description
Author:
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 1184
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