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Topic: Diagenesis

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	Highbeam Encyclopedia - Search Results for Diagenesis
		diagenesis Physical and chemical processes whereby sediments are transformed into solid rock, usually at low pressure and temperature.
		Investigations of burial diagenesis in carbonate hydrocarbon reservoir rocks.
		A Dictionary of Earth Sciences; 1/1/1999; AILSA ALLABY and MICHAEL ALLABY; 48 words; catagenesis Following diagenesis, in which sedimentary material is compressed and undergoes chemical changes, a phase in the formation of petroleum and natural...
	www.encyclopedia.com /SearchResults.aspx?Q=Diagenesis (848 words)

	Diagenesis - Wikipedia, the free encyclopedia
		In geology and oceanography, diagenesis is any chemical, physical, or biological change undergone by a sediment after its initial deposition and during and after its lithification, exclusive of surface alteration (weathering).
		Porosity usually decreases during diagenesis, except in rare cases such as dissolution of minerals and dolomitization.
		The study of diagenesis in rocks is used to understand the tectonic history they have undergone, the nature and type of fluids that have circulated through them and, from an economic standpoint, allows the assessment of the likelihood of finding various economic minerals and hydrocarbons.
	en.wikipedia.org /wiki/Diagenesis (271 words)

	Diagenesis -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-10-26)
		Diagenesis is the lowest grade of (Change in the structure of rock by natural agencies such as pressure or heat of introduction of new chemical substances) metamorphism.
		(The property of being porous; being able to absorb fluids) Porosity usually decreases during diagenesis, except in rare cases such as dissolution of minerals and dolomitization.
		The study of diagenesis in rocks is used to understand the tectonic history they have undergone, the nature and type of fluids that have circulated through them and, from an economic standpoint, allows the assessment of the likelihood of finding various economic minerals and (An organic compound containing only carbon and hydrogen) hydrocarbons.
	www.absoluteastronomy.com /encyclopedia/d/di/diagenesis.htm (273 words)

	Sediments, Diagenesis, and Sedimentary Rocks, 7 - Elsevier
		The volume deals with the chemical, mineralogical, and isotopic properties of sediments and sedimentary rocks and their use in interpreting the environment of formation and subsequent events in the history of sediments, and the nature of the ocean-atmosphere system through geological time.
		Formation and Diagenesis of Carbonate Sediments (J. Morse) 4.
		The Diagenesis of Biogenic Silica: Chemical Transformations Occurring in the Water Column, Seabed, and Crust (D. Demaster) 5.
	www.elsevier.com /inca/707352 (385 words)

	Oxford Brookes University - Geology - 8320 Petrology - Carbonate Diagenesis (Site not responding. Last check: 2007-10-26)
		Diagenesis of carbonates is of great economic importance.
		Diagenesis controls the porosity and permeability of carbonate reservoirs.
		It is important to distinguish between sparite cement (pore fill) and neomorphic spar, an in situ replacement of calcium carbonate in the solid state.
	www.brookes.ac.uk /geology/8320/carb-dia.html (820 words)

	DIAGENESIS AND SEDIMENTARY ENVIRONMENTS
		Diagenesis in the cores is a secondary effect not unique to the high-latitude environment, but in the absence of a direct record (now altered), the diagenetic record gives further evidence of changes in paleoenvironments (e.g., Quilty, this volume) that at times had relatively large silica biogenic productivity common to cold-water settings.
		Carbon-related diagenesis in Leg 188 cores is seen in recycled carbon (e.g., coal) and in secondary features resulting from in situ diagenesis (e.g., authigenic carbonate nodules).
		The diagenesis results from processes of different types characteristic of the varied paleoenvironments of the Prydz Bay margin, ranging from relatively cold deep-ocean to relatively warm lagoonal.
	www-odp.tamu.edu /publications/188_SR/synth/syn_7.htm (1049 words)

	Oxford Brookes University - Geology - 8320 Petrology - Sandstone Diagenesis (Site not responding. Last check: 2007-10-26)
		Diagenesis refers to the physical and chemical changes which take place after the deposition of a sediment.
		Secondary porosity is formed during diagenesis, usually by solution/dissolution of components of the rock.
		The images in the left hand column show thin sections of two sandstones which were impregnated with blue resin, to show up the porosity.
	www.brookes.ac.uk /geology/8320/sst-diag.html (544 words)

	Amazon.ca: Books: Diagenesis, III (Site not responding. Last check: 2007-10-26)
		It starts with the diagenesis of marine pore waters and soft-sediment deformations, followed by two chapters on sandstones - one on climatic influence in terrestrial sandstone diagenesis and the other on the deep-sea volcaniclastic sandstones.
		Diagenesis of carbonates is treated next, with one chapter on compactional diagenesis and another devoted to a case study (Aymestry Limestone Beds, UK).
		There are two chapters on the origin and migration of oil: (a) maturation of organic matter, and (b) relation of diagenesis to mineralization and hydrocarbon reservoir development, followed by a chapter on sedimentary ore genesis - banded iron-formation.
	www.amazon.ca /exec/obidos/ASIN/0444885161 (304 words)

	Diagenesis & deep burial conclusion of the Grès d'Annot arkoses
		However, the garnets do show severe etching facets and their population is significantly lower than in the southern areas (Table 8.1.2d).
		Their presence in samples of the upper super-cycle (including bed 6 and 7 in table 8.1.2d or appendix 2: Log Correlation) is still significant, whereby the garnets either are strongly- or moderately etched.
		The arkoses from the southern areas comprise high-porosity units (Table 8.1.1b), suggesting a rather ancient moderately burial of the southern areas that probably did not exceed depths of 1100m.
	home.no.net /chemo/Conclusions/ConDiag.htm (680 words)

	Haywick -- Polymineralic temperate carbonate diagenesis
		Type 2 (ferroan scalenohedral calcite) was the initial pore-filling cement and precipitated from reduced pore fluids in a phreatic environment, possibly during or soon after the transition from marine to meteoric diagenesis.
		Extensive skeletal diagenesis (stabilisation of magnesium calcite allochems, dissolution/recrystallisation of aragonite) occurred during type 3 and 4 cementation phases.
		Diagenesis in the Petane Group was stratigraphically influenced and ultimately controlled by uplift.
	www.rsnz.org /publish/nzjgg/2004/059.php (364 words)

	EOSC 221 - Siliciclastics: Diagenesis (Site not responding. Last check: 2007-10-26)
		Diagenesis occurs where the mineralogy of the rock becomes unstable as a result of changes in the conditions or chemistry.
		Changes in pressure and temperature cause new minerals to form or preexisting minerals to become modified as the sediment (or rock) adjusts to new equilibrium conditions.
		The diagenesis of carbonate rocks has also been studied in great detail.
	www.eos.ubc.ca /courses/eosc221/sed/sili/sildiag.html (135 words)

	ASSESSING THE IMPACT OF DIAGENESIS ON CARBON ISOTOPE RATIOS OF DINOSAUR TOOTH ENAMEL: A CASE STUDY FROM THE HELL CREEK ...
		Diagenesis was investigated by sampling enamel and dentine from the same teeth and comparing results to bone samples.
		Diagenesis was also assessed by comparing carbon isotope ratios of dinosaur enamel to ratios of associated sedimentary organic material.
		While none of these methods alone may be used to rule out the effects of diagenesis, a combined approach can provide a means of identifying large diagenetic changes in primary carbon isotope ratios.
	gsa.confex.com /gsa/2004AM/finalprogram/abstract_75776.htm (504 words)

	Diagenesis\|metamorphose Information (Site not responding. Last check: 2007-10-26)
		geology, '''diagenesis''' is any chemical, physical, or biological change undergone by a sediment after its initial deposition and during and after its lithification, exclusive of surface alteration (weathering).
		Grains of sediment, Rock (geology)rock fragments and fossils can be replaced by other minerals during diagenesis.
		When animal or plant matter is buried during sedimentation, the constituent organic molecules (lipids, proteins, carbohydrates and lignin-Humushumic compounds) break down due to the increase in temperature and pressure.
	www.echostatic.com /Diagenesis\|metamorphose.html (252 words)

	CLAY DIAGENESIS IN THE SANDSTONE RESERVOIR OF THE ELLON FIELD (ALWYN, NORTH SEA)
		The purpose of this paper is to describe clay diagenesis in a sandstone reservoir of the Brent Group in the North Sea which is heterogeneously cemented by calcite.
		We compare clay diagenesis in early calcite cemented sandstones with sandstones in which the calcite cement was absent during burial diagenesis.
		Palaeohydrodynamic fluid flow regimes during diagenesis of the Brent group in the Hutton-NW Hutton reservoirs, constraints from oxygen isotope studies of authigenic kaolin and reverse flexural modelling.
	hassouta.ifrance.com /article_clay/clay.html (6379 words)

	Diagenesis (Site not responding. Last check: 2007-10-26)
		Diagenesis invariably modifies the reservoir quality of a subsurface carbonate play and must be taken into consideration when risking prospects or developing existing reservoirs.
		Carbonate diagenesis often influences seismic and wireline log response by altering a rock's petrophysical attributes.
		Review of constituents, textures and porosity; Tools for evaluating carbonate diagenesis and porosity; Applied carbonate geochemistry; Limestone diagenesis and porosity evolution (with exercise); Dolomitization models and porosity evolution (with exercise); Facies controls on early diagenesis; Sequence stratigraphy and porosity evolution; Influence of diagenesis on petrophysics and log response; Exploration case studies; Development geology case studies.
	www.dravisinterests.com /carbdiag.html (668 words)

	Theses from Uppsala University : 2689 - Diagenesis and Sequence Stratigraphy
		Diagenesis and sequence stratigraphy have been formally treated as two separate disciplines in sedimentary petrology.
		Evidence from five case studies and from literature, enabled the development of a conceptual model for the spatial and temporal distribution of diagenetic alterations and related evolution of reservoir quality in sandstones deposited in paralic environments.
		The distribution of such alterations put important constrains for the pattern of burial diagenesis (e.g., formation of chlorite, illite, quartz), related evolution of reservoir quality in sandstones, and distribution of baffles and barriers for fluid flow in the context of sequence stratigraphy.
	publications.uu.se /theses/abstract.xsql?dbid=2689 (259 words)

	EARLY DIAGENESIS OF A PLEISTOCENE SHALLOW-WATER CARBONATE SEQUENCE: PETROLOGIC AND MINERALOGIC INDICATORS (Site not responding. Last check: 2007-10-26)
		Petrologic and mineralogic evidence from cores and outcrops of the uppermost 15 meters of rock indicates that the sediments have undergone a minimum of three episodes of diagenesis.
		The data suggest that the diagenesis occurred during lowstands in sea level after the 5e, 7, and 9 highstands.
		Vugs are more prevalent and larger after three episodes of diagenesis and occur rarely in rocks with only two episodes.
	gsa.confex.com /gsa/2001AM/finalprogram/abstract_23868.htm (462 words)

	Manganese diagenesis (Site not responding. Last check: 2007-10-26)
		It also shows that diagenesis in continental margin sediments is quantitatively important for the global manganese budget.
		A synthesis, in the form of a mathematical model, of the present understanding of manganese diagenesis in bioturbated sediments.
		The model-derived rate constant for manganese precipitation agrees with an experimentally measured rate constant, and the model predicts successfully the distribution of manganese in the pore water of sediments.
	www.eps.mcgill.ca /~sundby/MarineGeochemistry/manganese.html (436 words)

	Earth-Pages (Site not responding. Last check: 2007-10-26)
		Diagenesis affects all sediments after their deposition and includes a fundamental suite of physical, chemical and biological processes that control the texture, mineralogy and fluid-flow properties of sedimentary rocks.
		Understanding the processes and products of diagenesis is thus a critical component in the analysis of the evolution of sedimentary basins, and has practical implications for subsurface porosity destruction, preservation and generation.
		Diagenesis Of Sandstones In The Back-Arc Basins Of The Western Pacific Ocean: Y.I. Lee And G.Dev.
	www.earth-pages.com /books.asp?page=book&ref=1405108975 (969 words)

	Diagenesis and Geochemistry of Late Quaternary Porites Corals: Implications for Palaeoenvironmental Reconstructions ... (Site not responding. Last check: 2007-10-26)
		Diagenesis and Geochemistry of Late Quaternary Porites Corals: Implications for Palaeoenvironmental Reconstructions H.V. McGregor and M.K.Gagan
		Thin-section analysis of the coral skeletons reveals a predictable sequence of vadose-zone diagenesis, which progresses from initial leaching of coralline aragonite with fine calcite overgrowths, to calcite void filling and calcitic neomorphic replacement of the coral skeleton.
		Although diagenesis of coralline aragonite could severely alter palaeoclimate proxies, fine-scale sampling, textural analysis, and geochemical screening techniques can be imposed to ensure that it does not impede the reconstruction of tropical palaeoclimates.
	rses.anu.edu.au /enproc/EP/ep_annrep/mcgregor.html (351 words)

	Lynton Land - Dept. of Geological Sciences - UT Austin
		Diagenesis of sedimentary rocks, especially burial diagenesis in the Gulf of Mexico sedimentary basin, was the major focus of my research over a period of 30 years, resulting in 137 publications and graduate degrees granted to 21 students.
		I first focused on carbonates, then on sandstones, formation waters, carbon dioxide in natural gas, organic acids, and evaporates, and ended the project by re-examining the behavior of mudrocks during burial.
		The mass transfer of components involved in rock diagenesis obviously also bears on the mass transfer of the products of kerogen maturation (petroleum migration).
	www.geo.utexas.edu /faculty/land.htm (613 words)

	Oilfield Glossary: Term 'diagenesis'
		After deposition, sediments are compacted as they are buried beneath successive layers of sediment and cemented by minerals that precipitate from solution.
		Porosity usually decreases during diagenesis, except in rare cases such as dissolution of minerals and dolomitization.
		There is not a clear, accepted distinction between diagenesis and metamorphism, although metamorphism occurs at pressures and temperatures higher than those of the outer crust, where diagenesis occurs.
	www.glossary.oilfield.slb.com /Display.cfm?Term=diagenesis (146 words)

	The John Hopkins University
		The principal objective is to quantify the hydrogeologic regimes for clastic diagenesis, using the San Joaquin Basin of California to establish geologic constraints for mathematical modeling at the basin and formation scale.
		The principal task however is to quantify the paleohydrology and thermal history of the San Joaquin Basin with a new finite-element code for simulating fluid migration and pressure changes during sedimentation, uplift, and erosion.
		The research seems to be showing that the hydrodynamics of diagenesis in sedimentary basins is more strongly affected by the external hydrogeologic forcing of tectonics and climate, than previously suggested by geochemical self-organization theories.
	www.er.doe.gov /production/bes/geo/Publications/FY97Summ/johns.htm (1708 words)

	Sediments affected by diagenesis (from clay mineral) -- Encyclopædia Britannica
		As temperature and pressure increase with the progression of diagenesis, clay minerals in sediments under these circumstances change to those stable under given conditions.
		Therefore, certain sensitive clay minerals may serve as indicators for various stages of diagenesis.
		More results on "Sediments affected by diagenesis (from clay mineral)" when you join.
	www.britannica.com /eb/article-80149?tocId=80149 (868 words)

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