Citations with the tag: DIAGENESIS
Results 1 - 50
- Syndepositional diagenesis of modern platform carbonates: Evidence from isotopic and minor...
Patterson, William P.; Walter, Lynn M. // Geology; Feb94, Vol. 22 Issue 2, p127
Reports on syndepositional diagenesis of modern platform carbonates. Testing for minor and stable isotopic compositional shifts; Contributing factors to alteration of biogenic grains; Comments on Florida's carbonate sediment composition; Physical changes in experimental substrates; Chemical...
- Effects of Sea Spray on Vadose Diagenesis of Late Quaternary Aeolianites, Bermuda.
McLaren, Sue J. // Journal of Coastal Research; Winter2001, Vol. 17 Issue 1, p228
Investigates the role of sea spray in the diagenetic alteration, cementation and weathering of late Pleistocene aeoloanites in the vadose zone from Bermuda. Increase in secondary porosity; Processes operating in the sea spray zone.
- Diagenetic origin for quartz-pebble conglomerates.
Cox, Rónadh; Gutmann, Ethan D.; Hines, Patricia G. // Geology; Apr2002, Vol. 30 Issue 4, p323
Examines the occurrence of quartz-pebble conglomerate (QPC) in the rock record. Age distribution of QPC; Role of diagenetic factors in QPC formation; Proportions of diagenetic secondary matrix and pressure-solved grain contacts.
- Sediment Diagenesis (Book).
Klein, George deVries // American Scientist; May/Jun85, Vol. 73 Issue 3, p290
Reviews the book 'Sediment Diagenesis,' edited by A. Parker and B.W. Sellwood.
- Discrete clay diagenesis in a very low-permeable sequence constrained by an isotopic (Kï¿½Ar and Rbï¿½Sr) study.
Rousset, Davy; Clauer, Norbert // Contributions to Mineralogy & Petrology; May2003, Vol. 145 Issue 2, p182
Multimethod analyses of several size fractions of clays were used to reconstruct the diagenetic history of the shallow buried claystones within the Paris Basin. A systematic decrease occurred in Kï¿½Ar dates relative to the decrease in size of the clay fractions, signifying higher amounts of...
- Kinetic Modeling of Diagnesis of Eogene Lacustrine Sandstone Reservoirs in the Jianghan Basin, Southeastern China.
Ni Shijun; Qing Hairuo; Tang Jianwu; Zhou Meifu; Li Zeqin // Chinese Journal of Geochemistry; 2002, Vol. 21 Issue 4, p298
Presents a study on the kinetic modeling of diagenesis of Eogene Lacustrine sandstone reservoirs in the Jianghan Basin, Southeastern China. Diagenetic features identified in the sandstones; Simulation of the kinetics of fluid-mineral reactions and the concentrations of aqueous species; Result...
- Missing molluscs as evidence of large-scale, early skeletal aragonite dissolution in a Silurian sea.
Cherns, Lesley; Wright, V. Paul // Geology; Sep2000, Vol. 28 Issue 9, p791
Compares silicified and nonsilicified faunas in a Silurian sea in Gotland, Sweden, which suggests the amount of taphonomic loss by aragonite dissolution. Faunal analysis showing a massive depletion of skeletal aragonite; Indications that mollusks are the probable source of diagenetic calcite;...
- Deposition and diagenesis of the lacustrine-fluvial Cangfanggou Group (uppermost Permian to Lower Triassic), southern Junggar Basin, NW China: a contribution from sequence stratigraphy
Parnell, J.; Tang, Z.; Ruffell, A. H. // Journal of Paleolimnology; 1994, Vol. 11 Issue 1, p67
No abstract available.
Hannan, Chris // Texas Review; Spring/Summer2012, Vol. 33 Issue 1/2, p123
The poem "Diagenesis" by Chris Hannan is presented. First Line: Dig deep enough, down through the earth, Last Line: a geology that stratifies your gut, forms stones in your throat.
- High-resolution stable isotope records from the Upper Cretaceous rocks of Italy and Spain...
Stoll, Heather M.; Schrag, Daniel P. // Geological Society of America Bulletin; Feb2000, Vol. 112 Issue 2, p308
Investigates the oxygen isotopic excursions in the upper Cretaceous rocks of Italy and Spain. Use of isotope records from the Contessa section; Use of the numerical models of diagenesis; Link between episodes of global cooling and sea-level falls.
- Diagenetic evidence for massive evaporite dissolution, fluid flow, and mass transfer in the...
McManus, Kathleen M.; Hanor, Jeffrey S. // Geology; Aug93, Vol. 21 Issue 8, p727
Reports on the role of large-scale fluid flow and mass transfer on diagenesis in the West Hackberry salt dome in southwestern Louisiana. Mass of cements; Sources of components; Hydrologic and geochemical regime.
- Diagenetic study of the host rocks of the Kipushi ore deposit, Democratic Republic of Congo.
Van Wilderode, J. // Geologica Belgica; Sep2011, Vol. 14 Issue 3/4, p294
An abstract of the article "Diagenetic study of the host rocks of the Kipushi ore deposit, Democratic Republic of Congo" by J. Van Wilderode is presented.
- Antarctic permafrost: An analogue for water and diagenetic minerals on Mars.
Dickinson, Warren W.; Rosen, Michael R. // Geology; Mar2003, Vol. 31 Issue 3, p199
At high altitudes (>1000 m) throughout the Dry Valleys, Antarctica, liquid water is rare, yet ground ice, which may be millions of years old, is pervasive in glacial sediments and bedrock. The origin of this ice is different from its arctic and alpine counterparts and may be similar to water on...
- Limestone-marl alternations: A warm-water phenomenon?
Westphal, Hildegard; Munnecke, Axel // Geology; Mar2003, Vol. 31 Issue 3, p263
Ancient limestone-marl alternations are concentrated in settings analogous to loci of aragonite accumulation in the modern world. They typically occur on shelves in the tropical-subtropical climate belt, are far more abundant on passive continental margins than on active ones, and are rare in...
- Revisiting silicate authigenesis in the Pliocene-Pleistocene Lake Tecopa beds, southeastern California: Depositional and hydrological controls.
Larsen, Daniel // Geosphere; Jun2008, Vol. 4 Issue 3, p612
The Pliocene-Pleistocene Lake Tecopa beds present a well-documented example of authigenic silicate diagenesis in an ancient saline, alkaline lake environment. Controls on authigenic mineral formation and distributions were investigated in nine stratigraphic sections aligned along a north-south...
- Obtaining diagenetic ages from metamorphosed sedimentary rocks: U-Pb dating of unusually coarse xenotime cement in phosphatic sandstone.
Vallini, Daniela; Rasmussen, Birger; Krapez, Bryan; Fletcher, Ian R.; McNaughton, Neal J. // Geology; Dec2002, Vol. 30 Issue 12, p1083
Demonstrates that large xenotime overgrowths and pore-filling cements in Proterozoic metasedimentary rocks from southwestern Australia formed during early diagenesis. Use of ion microprobe for dating diagenetic xenotime; Authigenic xenotime; Greenschistfacies metamorphism and the development of...
- Water--sediment exchange of nutrients during early diagenesis and resuspension of anoxic sediments from the northern Adriatic Sea shelf
Bergamini, M. C.; Spagnoli, F. // Water, Air & Soil Pollution; Oct1997, Vol. 99 Issue 1-4, p541
This paper presents the results of a study on nutrient exchange at the sediment-water interface which is caused by early diagenesis and resuspension of bottom sediments. The research was carried out on anoxic silty-clay sediment cores collected south of the Po river delta (Northern Adriatic Sea,...
- Biochemical indicators of diagenetic alteration in natural organic matter mixtures.
Cowie, Gregory L.; Hedges, John I. // Nature; 5/26/1994, Vol. 369 Issue 6478, p304
Reports on a study of biochemical indicators, aldoses and amino acids, in samples collected from a variety of marine depositional environments representing different stages of alteration. Determination of degradation of natural organic mixtures; Sensitivity of parameters.
- Early Diagenesis (Book).
McDuff, Russell E. // American Scientist; Sep/Oct81, Vol. 69 Issue 5, p558
Reviews the non-fiction book 'Early Diagenesis: A Theoretical Approach,' by Robert A. Berner.
- Manganese ore potential related to hydrosulfuric pollution of bottom waters (with the Black Sea as an example).
Nedumov, R. // Lithology & Mineral Resources; Jan2006, Vol. 41 Issue 1, p15
Conditions and scales of the accumulation of dissolved manganese in waters of marine basins with hydrosulfuric contamination are considered. It is shown that the Kalamit ferromanganese nodule field, most probably, originated due to the delivery of manganese from the hydrosulfuric zone of the...
- Managanese and iron in the White Sea: Sedimentation and diagenesis.
Rozanov, A.; Volkov, I.; Kokryatskaya, N.; Yudin, M. // Lithology & Mineral Resources; Sep2006, Vol. 41 Issue 5, p483
Iron and manganese in bottom sediments studied along the sublatitudinal transect from Kandalaksha to Arkhangelsk are characterized by various contents and forms depending on sedimentation environments, grain size of sediments, and diagenetic processes. The latter include redistribution of...
- Paleo-fluid flow and deformation in the Aztec Sandstone at the Valley of Fire, Nevadaï¿½Evidence for the coupling of hydrogeologic, diagenetic, and tectonic processes.
Eichhubl, Peter; Lansing Taylor, W.; Pollard, David D.; Aydin, Atilla // Geological Society of America Bulletin; Sep/Oct2004, Vol. 116 Issue 9/10, p1120
Paleo-fluid flow conditions are reconstructed for an exhumed faulted and fractured sandstone aquifer, the Jurassic Aztec Sandstone at Valley of Fire, Nevada. This reconstruction is based on detailed mapping of multicolored alteration patterns that resulted from syndepositional reddening of the...
- What in the World Is It?
Harper, Constance // Odyssey; Jul/Aug2008, Vol. 17 Issue 6, p9
The article offers information on the concretion, the concrete-like material created when a metal object has been immersed in seawater for many years, which was found at the Whydah ship in Cape Cod, Massachusetts.
- Wild Tropical Forest Soil Characteristics and Composition of Directly Extractable Soil Lipid Fraction.
Sorho, Siaka; Yaya, Soro; Augustin, Adima Amissa; Laurent, Leme; Andr�, Ambles // Journal of Applied Sciences; 2006, Vol. 6 Issue 15, p3110
Soil characteristics of a wild tropical forest from Cote d'Ivoire and composition of directly extractable soil lipid fraction were investigated. This study was undertaken with the aim to establish soil characteristics, structures and origin of directly extractable lipids components as tile first...
- Uraniferous diagenetic xenotime in northern Australia and its relationship to unconformity-associated uranium mineralisation.
Daniela Vallini; David Groves; Neal McNaughton; Ian Fletcher // Mineralium Deposita; Jan2007, Vol. 42 Issue 1, p51
Abstract?? Stratabound, uraniferous diagenetic xenotime cements provide a minimum depositional age of 1,632?3?Ma for the sedimentary Birrindudu Group in the Killi Killi Hills, Tanami Region in northern Australia. The age of xenotime formation is broadly coeval with that recently proposed...
Daniela Vallini; David Groves; Neal McNaughton; Ian Fletcher // American Heritage Student Science Dictionary; 2009, p146
An encyclopedia entry for the term "geode" is presented. It refers to a mall, hollow, usually rounded rock lined on the inside with inward-pointing crystals. Geodes form when mineral-rich water entering a cavity in a rock undergoes a sudden change in pressure or temperature.
- Paleomagnetism and paleogeography of Jurassic radiolarian cherts from the northern Apennines of...
Aiello, I.W.; Hagstrum, J.T. // Geological Society of America Bulletin; Apr2001, Vol. 113 Issue 4, p469
Discusses the paleomagnetism and paleogeography of Jurassic radiolarian cherts from the northern Apennines of Italy. Deposition and diagenesis of cherts; Geologic and tectonic setting; Components of magnetization; Primary magnetization of the carbon component.
- Conversion of diatoms to clays during early diagenesis in tropical, continental shelf muds.
Michalopoulos, Panagiotis; Aller, Robert C. // Geology; Dec2000, Vol. 28 Issue 12, p1095
Discusses the process of the conversion of marine diatom frustules to various forms of authigenic aluminosilicates during early diagenesis in tropical, continental shelf muds in the Amazon River. Similarity of neoformed crystalline phases to K-smectite; Duration of conversion process.
- Limitations on lowstand meteoric diagenesis in the Pliocene-Pleistocene of Florida and Great...
Melim, Leslie A. // Geology; Oct96, Vol. 24 Issue 10, p893
Discusses patterns of meteoric diagenesis in the carbonate sediment samples from South Florida and the Great Bahama Bank during the Pliocene-Pleistocene boundary era. Attribution of diagenetic patterns to large-scale lowstands in shallow water facies; Phreatic diagenesis indicated in three...
- Benthic geochemistry of manganese in the Bay of Biscay, and sediment mass accumulation rate.
Mouret, Aurélia; Anschutz, Pierre; Lecroart, Pascal; Chaillou, Gwénaëlle; Hyacinthe, Christelle; Deborde, Jonathan; Jorissen, Frans; Deflandre, Bruno; Schmidt, Sabine; Jouanneau, Jean-Marie // Geo-Marine Letters; Jun2009, Vol. 29 Issue 3, p133
Manganese is a major redox reactive element of benthic metabolism. We have built a database of existing knowledge on the benthic geochemistry of Mn in the Bay of Biscay, in order to comprehensively assess the behaviour of Mn in a variety of environments during early diagenesis. The database...
- Overgrowths of large authigenic apatite crystals on the surface of conodonts from Cantabrian limestones (Spain).
Sanz-López, Javier; Blanco-Ferrera, Silvia // Facies; Oct2012, Vol. 58 Issue 4, p707
Conodonts from the middle to upper Paleozoic limestones of the Cantabrian zone commonly show apatite overgrowths. A large crystal microtexture observed under the SEM corresponds to local rims of euhedral to subhedral apatite crystals, which were preceded by the neoformation of smaller crystals....
- Diagenesis of the Neogene Uloa Formation of Zululand,...
Liu, K.W. // South African Journal of Geology; Mar95, Vol. 98 Issue 1, p25
Investigates the diagenetic environment and textures in the Neogene Uloa Formation of Zululand, South Africa. Importance of the Uloa Formation in Neogene sequence in South Africa; Stratigraphic sequence of the Uloa Formation; Sequence of diagenetic events and climate.
- Compositional heterogeneity and microstructural diversity of coral skeletons: implications for taxonomy and control on early diagenesis.
C. Perrin // Coral Reefs; Jul2003, Vol. 22 Issue 2, p109
Fine-scale features of scleractinian skeletons were investigated in living colonies, from ultra-thin sections and SEM preparations. In contrast to what is commonly admitted, the coral fiber is a composite structure differing markedly from a simple aragonite crystal unit. The heterogeneity of...
- Biogenic Fe and Mn accumulation in the bottom sediments of Lake Baikal.
Granina, L.; Zakharova, Yu.; Parfenova, V. // Geochemistry International; Nov2011, Vol. 49 Issue 11, p1154
The article discusses a study which investigated the role of microbial community in the diagenetic transformations of iron (Fe) and manganese (Mn) with reference to sedimentation conditions in Lake Baikal in Russia. The living conditions of the microorganisms in the sediment samples collected...
- Preservation of Biogenerated Mixed Facies: A Case Study from the Neoproterozoic Villa MÃ³nica Formation, Sierra La Juanita, Tandilia, Argentina.
Zalba, P.E.; Manassero, M.; Morosi, M.E.; Conconi, M.S. // Journal of Applied Sciences; 2010, Vol. 10 Issue 5, p363
The aim of this contribution was to show through field work and mineralogical microtextural studies a complex history of weathering and diagenesis in the Villa MÃ³nica Formation, the most ancient Neoproterozoic unit of the Tandilia System and to present a proposal of a paragenetic sequence....
- MENTEÅžE DOLOMÄ°TLERÄ°NÄ°N PETROGRAFÄ°K Ã–ZELLÄ°KLERÄ° (ISPARTA).
Dinç, Salih; Müjdat Özkan, A. // e-Journal of New World Sciences Academy (NWSA); 2010, Vol. 5 Issue 3, p178
The study area in the Isparta Angle area of the Western Taurus in the region between Kasimlar - Karacahisar covers an area of approximately 386 km2. In the study area almost every period to the Paleozoic-present sedimentary, magmatic and metamorphic rock groups crop out. This part of the rock...
- Dolomites Petrography and Geochemistry of the Chuping Formation, Malaysia.
Adenan, Noorhashima Binti; Ali, Che Aziz; Mohamed, Kamal Roslan // AIP Conference Proceedings; Dec2013, Vol. 1571, p445
Detailed petrographic and geochemical studies had been done to 89 samples from the Chuping Formation collected at Bukit Tengku Lembu area. The aim of this paper is to document the nature of dolomitization and its petrographical characteristics. Two types of dolomites have been recognized;...
- Diagenetic alterations of copper sulfides in modern ore-bearing sediments of the Logatchev-1 hydrothermal field (Mid-Atlantic Ridge 14ï¿½45' N).
Gablina, I.; Semkova, T.; Stepanova, T.; Gor�kova, N. // Lithology & Mineral Resources; Jan2006, Vol. 41 Issue 1, p27
Sulfide ore samples recovered by corers from and beyond Orebody 1 in the Logatchev-1 hydrothermal field (Mid-Atlantic Ridge, 14ï¿½45' N) are studied by optical, electron microscopic, X-ray microspectral, and X-ray diffraction methods. The major and ore minerals are identified. Sulfides of the...
- Geochemistry and specific features of manganese ore formation in sediments of oceanic bioproductive zones.
Dubinin, A.; Uspenskaya, T. // Lithology & Mineral Resources; Jan2006, Vol. 41 Issue 1, p1
Processes of authigenic manganese ore formation in sediments of the northern equatorial Pacific are considered on the basis of study of the surface layer (<2 mm) of ferromanganese nodule and four micronodule size fractions from the associated surface sediment (0ï¿½7 cm). Inhomogeneity of the...
- REE geochemistry of Early Cambrian phosphorites from Gezhongwu Formation at Zhijin, Guizhou Province, China.
Shi Chunhua; Hu Ruizhong // Chinese Journal of Geochemistry; 2005, Vol. 24 Issue 2, p166
The Cambrian Gezhongwu Formation in Southwest China is the lowest Cambrian phosphorite unit. The Formation belongs to the Meishucun stage with small shelly fossils. Rare-earth element (REE) data from the Gezhongwu phosphorites of Zhijin documented the depositional conditions. The total REE...
- NH-bearing micas in poly-metamorphic Alpujï¿½rride micaschists and gneisses from the central zone of the Betic Cordillera (Spain): tectono-metamorphic and crystal-chemical constraints.
Ruiz Cruz, Maria // Mineralogy & Petrology; Mar2011, Vol. 101 Issue 3/4, p225
The content and distribution of NH-bearing micas in micaschists and paragneisses of the Alpujï¿½rride complex (Betic Cordillera, Spain) are interpreted on the basis of textures, metamorphic history and crystal-chemical constraints. NH is present in important amounts in early micas, recording...
- Molar tooth structures: Formation and specificity of carbonate diagenesis in the Late Precambrian, Middle Riphean Sukhaya Tunguska Formation of the Turukhansk Uplift, Siberia.
Petrov, P. // Stratigraphy & Geological Correlation; Jun2011, Vol. 19 Issue 3, p247
new way of formation of the problematic Molar Tooth (MT) structures, which, along with stromatolites, could be considered as a 'visiting card' of the Riphean, was examined on the example of carbonate sediments of the Riphean Sukhaya Tunguska Formation from the Turukhansk Uplift, Siberia. These...
- Study of Porosity Loss Due to Compaction in the Cretaceous Upper Bima Sandstone, Upper Benue Trough, N.E. Nigeria.
Samaila, N. K.; P. Singh2, G. // Earth Science India; 2010, Vol. 3 Issue 2, p105
Present paper entails the study carried out on the fluvial Cretaceous Upper Bima Sandstone of the Upper Benue Trough. Compositional and textural changes due to diagenesis have altered the reservoir properties of the formation. Modal analyses reveal that these sandstones comprise of 71.21%...
- Comparing Lignin-Derived Phenols, Î´C Values, OC/N Ratio and C Age Between Sediments in the Kaoping (Taiwan) and the Kapuas (Kalimantan, Indonesia) Rivers.
Loh, Pei; Chen, Chen-Tung; Lou, Jiann-Yuh; Anshari, Gusti; Chen, Houng-Yung; Wang, Jough-Tai // Aquatic Geochemistry; Mar2012, Vol. 18 Issue 2, p141
The Kaoping (Taiwan) and Kapuas (Indonesia) Rivers differ in hydrological cycle, topography and landscape. These differences strengthen the use of C dating, lignin-derived phenols, Î´C values and C/N ratios to determine the sources and diagenesis of surface sedimentary organic carbon (OC) in...
- Geochemistry of Lower Jurassic sandstones of Shemshak Formation, Kerman basin, Central Iran: Provenance, source weathering and tectonic setting.
Moosavirad, S.; Janardhana, M.; Sethumadhav, M.; Prakash Narasimha, K. // Journal of the Geological Society of India; May2012, Vol. 79 Issue 5, p483
Lower Jurassic sandstones of Shemshak Formation of Kerman basin, central Iran were analyzed for major and select trace elements to infer their provenance, palaeoweathering of source rocks and tectonic setting. Average modal framework components (Qt: F: L= 67.25: 2.41: 30.48) and chemical...
- Upper Oligocene diatomaceous deposits in the northern North Sea - silica diagenesis and paleogeographic implications.
THYBERG, BRIT I.; STABELL, BJØRG; FALEIDE, JAN INGE; BJØRLYKKE, KNUT // Norwegian Journal of Geology / Norsk Geologisk Forening; 4/12/99, Vol. 79 Issue 1, p3
Relatively well-preserved diatoms, often cemented together as silica aggregates and mainly composed of opal-A, are present in Upper Oligocene sediments at burial depths down to about 1500 m in the northern North Sea. The taxon Paralia thybergii dominates, but Stephanopyxis spp., Coscinodiscus...
- Diagenetic influences on iron-bearing minerals in Devonian carbonate and siliciclastic rocks of Estonia.
Shogenova, Alla; Kleesment, Anne // Proceedings of the Estonian Academy of Sciences, Geology; Dec2006, Vol. 55 Issue 4, p269
The Estonian Devonian sediments consist of carbonate, siliciclastic, and mixed carbonate-siliciclastic deposits that have undergone extensive dolomitization. Chemical analysis of 165 samples and XRD mineralogical analysis of 10 samples from 8 drill cores were carried out and combined with...
- Characteristics, origin and geoarchaeological significance of carbonate concretions from the early Bronze Age locality "OrovaÄki vinogradi", (Bjelovar, Croatia).
Barudžija, Uroš; Jakovljević, Goran; Aljinović, Dunja; Brčić, Vlatko; Tadej, Neven // Geologia Croatica; Dec2010, Vol. 63 Issue 3, p323
"White horizon" archaeological units consisting of carbonate concretions occur in the archaeological settlement of "OrovaÄki vinogradi", located near Bjelovar (NW Croatia). During archaeological excavation these horizons were considered to be the inhabitation-levels within the historical...
- Lateral variation in sandstone lithofacies from conventional core, Scotian Basin: implications for reservoir quality and connectivity1,2.
Gould, Kathleen M.; Piper, David J.W.; Pe-Piper, Georgia; Dehler, Sonya; Deptuck, Mark; Karim, Atika // Canadian Journal of Earth Sciences; Dec2012, Vol. 49 Issue 12, p1478
Facies analysis in outcrops on land is strongly dependent on the lateral variability of lithofacies. Interpretation of conventional core in wells relies principally on the vertical succession of lithofacies. To better understand depositional environments and reservoir sandstone connectivity, the...
- Abiotic Formation of Valine Peptides Under Conditions of High Temperature and High Pressure.
Furukawa, Yoshihiro; Otake, Tsubasa; Ishiguro, Takato; Nakazawa, Hiromoto; Kakegawa, Takeshi // Origins of Life & Evolution of the Biosphere; Dec2012, Vol. 42 Issue 6, p519
We investigated the oligomerization of solid valine and the stabilities of valine and valine peptides under conditions of high temperature (150-200 Â°C) and high pressure (50-150 MPa). Experiments were performed under non-aqueous condition in order to promote dehydration reaction. After...