The Effects of Dissolved Sulfate on High Temperature Nucleation and Kinetic Growth of Dolomite
Author | : Michelle Lea Borowski |
Publisher | : |
Total Pages | : 80 |
Release | : 1995 |
Genre | : Calcite |
ISBN | : |
Download The Effects Of Dissolved Sulfate On High Temperature Nucleation And Kinetic Growth Of Dolomite full books in PDF, epub, and Kindle. Read online free The Effects Of Dissolved Sulfate On High Temperature Nucleation And Kinetic Growth Of Dolomite ebook anywhere anytime directly on your device. Fast Download speed and no annoying ads. We cannot guarantee that every ebooks is available!
Author | : Michelle Lea Borowski |
Publisher | : |
Total Pages | : 80 |
Release | : 1995 |
Genre | : Calcite |
ISBN | : |
Author | : Yihang Fang |
Publisher | : |
Total Pages | : 0 |
Release | : 2022 |
Genre | : |
ISBN | : |
With over centuries of effort to understand the formation mechanism of dolomite, a common mineral in sedimentary rocks, the geologic community still struggles to formulate a universal mechanism to explain the origin of massive deposition of sedimentary dolomite. Understanding the exact mechanism for dolomite formation at Earth's surface conditions is crucial for investigating economic reservoirs, interpreting sedimentary environments, reconstructing secular seawater variations, assessing potential carbon sequestration reservoirs, and understanding biominerlization processes.One of the main obstacles for dolomite nucleation and growth is the high water affinity of magnesium and the subsequent kinetic energy barrier for surface Mg2+-water complex to dehydrate. Polysaccharides, exopolymeric substances (EPS), and hydrogen sulfides demonstrate the capability to overcome the kinetic barriers and catalyze dolomite growth, which supports the hypothesis that sedimentary dolomite has a microbial origin. However, not all dolomite are formed by microbial life as dolomite is much more abundant in earlier Earth history when microbial activity levels are lower compare to nowadays, and an abiotic mechanism is needed to explain massive dolomite formation. This work applied laboratory and synchrotron X-ray diffraction, high-resolution TEM imaging, Z-contract imaging, and electron microprobe analysis on low-temperature synthesized and natural samples to understand abiotic controls on surface Mg2+-water complex dehydration and dolomite precipitation. Several focused studies were conducted toward exploring this topic, including: (1) Using ethanol-water mixtures to validate the hypothesis that low-dipole moment materials induce the surface Mg2+-water complex dehydrate, thus allowing disordered dolomite precipitation; (2) Demonstrating that dissolved silica, a low dipole moment molecule, in naturally available concentrations can promote disordered dolomite growth; (3) Applying a dissolved silica catalyzed dolomite growth model to decipher Marinoan cap carbonate formation with coupled Ca, Mg Si, and C cycles; (4) Testing dissolved silica driven dolomite growth in modern hypersaline settings (i.e., the Great Salt Lake, UT); (5) Examining the effect of dissolved silica toward catalyzing dolomite formation in Early Silurian dolomite. Results from this research demonstrate that dissolved silica may be a dominating abiotic control for dolomite precipitation in early Earth history, when dissolved silica in seawater is significantly higher prior to the appearance of silica-consuming microorganisms, and modern hypersaline environments. This abiotic mechanism would allow the reconstruction of solution chemistry changes based on abundances, textures, and associated minerals of dolomite. Changes in dolomite abundances might also contain information on weathering intensities, sea level variations, and Wilson cycles both locally and globally from changes in dissolved silica concentration.
Author | : Stephen Emil Kaczmarek |
Publisher | : |
Total Pages | : 494 |
Release | : 2005 |
Genre | : Crystal growth |
ISBN | : |
Author | : Colin J. R. Braithwaite |
Publisher | : Geological Society of London |
Total Pages | : 430 |
Release | : 2004 |
Genre | : Mathematics |
ISBN | : 9781862391666 |
The wide distribution of dolomite rocks in North American, Middle- and Far-Eastern hydrocarbon reservoirs is reason enough for their intensive study. In this volume dolomite enthusiasts review progress and define the current boundaries of dolomite research, related particularly to the importance of these rocks as reservoirs.
Author | : Stephan Harold Nordeng |
Publisher | : |
Total Pages | : 288 |
Release | : 1994 |
Genre | : Calcite |
ISBN | : |
Author | : William M. White |
Publisher | : John Wiley & Sons |
Total Pages | : 1218 |
Release | : 2013-01-22 |
Genre | : Science |
ISBN | : 1118485270 |
This book provides a comprehensive introduction to the field of geochemistry. The book first lays out the ‘geochemical toolbox’: the basic principles and techniques of modern geochemistry, beginning with a review of thermodynamics and kinetics as they apply to the Earth and its environs. These basic concepts are then applied to understanding processes in aqueous systems and the behavior of trace elements in magmatic systems. Subsequent chapters introduce radiogenic and stable isotope geochemistry and illustrate their application to such diverse topics as determining geologic time, ancient climates, and the diets of prehistoric peoples. The focus then broadens to the formation of the solar system, the Earth, and the elements themselves. Then the composition of the Earth itself becomes the topic, examining the composition of the core, the mantle, and the crust and exploring how this structure originated. A final chapter covers organic chemistry, including the origin of fossil fuels and the carbon cycle’s role in controlling Earth’s climate, both in the geologic past and the rapidly changing present. Geochemistry is essential reading for all earth science students, as well as for researchers and applied scientists who require an introduction to the essential theory of geochemistry, and a survey of its applications in the earth and environmental sciences. Additional resources can be found at: www.wiley.com/go/white/geochemistry