Download or read book Compaction and Earliest Pore water Diagenesis in Late Pleistocene Holocene Pelagic and Terrigenous Sediments of the Labrador Sea written by Mark Edmund Fay and published by . This book was released on 1994 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Two deep-sea cores from the Labrador Sea have been examined using a variety of techniques. Sediments from the eastern levee of the North Atlantic Mid-Ocean Channel consist of spill-over turbidites interstratified with hemipelagic sediments and ice-rafted detritus which are correlatable with levee cores described in earlier studies. The same facies are found on the lower Labrador Slope except that, here, the amount of ice-rafted detritus in the hemipelagic facies is more variable. Compressibility tests have enabled an evaluation of the porosity-permeability character of the levee spill-over facies at deeper levels of burial. Organic- and inorganic carbon contents, shear strength and porosity are unique to each facies. These, and the chemistry of the pore waters have been used to infer the early diagenetic processes occurring at both sites." --
Download or read book CIM Bulletin written by Canadian Institute of Mining and Metallurgy and published by . This book was released on 1997 with total page 600 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Quarterly Bulletin of the Canadian Mining Institute written by Canadian Institute of Mining, Metallurgy and Petroleum and published by . This book was released on 1996-06 with total page 590 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Petroleum Abstracts written by and published by . This book was released on 1997 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Deep sea Record of Rapid Late Pleistocene Paleoclimate Change and Ice sheet Dynamics in Labrador Sea Sediments written by Harunur Rashid and published by . This book was released on 2002 with total page 406 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The presence of H3 between 46° and ~63°N in the Labrador Sea, previously debated, has been proved. Thickness variations for H3 were compiled on an isopach map showing a maximum thickness of 4.8 m near Hudson Strait and thinning to 30 cm in the central Labrador Sea." --
Download or read book Sedimentology and Diagenesis of Pleistocene and Holocene Limestones written by Susanne Larkin Ridley and published by . This book was released on 1986 with total page 308 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Sediment pore Fluid Interactions During Diagenesis of Modern and Ancient Mudrocks written by Victoria C. Hover and published by . This book was released on 1996 with total page 680 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Diagenesis of Deep sea Biogenic Sediments written by Gerrit J. Van der Lingen and published by Hutchinson Ross Publishing Company. This book was released on 1977 with total page 410 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Depositional facies of late Pleistocene Heinrich events in the Labrador Sea written by R. Hesse and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Sedimentological and Chemical Attributes of Late Pleistocene Cool water Carbonates from the Southern Australian Continental Margin written by John M. Rivers and published by . This book was released on 2008 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt: The high-energy open shelf along the southern Australian continental margin is blanketed by heterozoan cool-water carbonates of late Pleistocene and Holocene age. Three distinct assemblages have been identified and radiocarbon dated. These include: i) Holocene grains, unaltered biofragments deposited during Marine Isotope Stage 1; ii) stranded grains, grey and buff-colored abraded biofragments and intraclasts marooned during the sea level rise associated with the latter stages of Marine Isotope Stage 2; and iii) relict grains, highly abraded, iron-stained intraclasts originally deposited during the intermediate sea-level stands of Marine Isotope Stages 3 and 4. Whereas the skeletal makeup of Holocene grains has been previously detailed, attributes of the older grains have not been elucidated. Relict-grain skeletal composition indicates that during Marine Isotope Stages 3 and 4 shallow, warm, oligotrophic, marine grassbed environments developed across the western portion of the region, whereas more heterozoan assemblages to the east imply cooler marine waters and that an overall upwelling regime was in effect. Stranded grains (Marine Isotope Stage 2) are mostly heterozoan across the whole region, reflecting deposition on narrower shelves (restricted euphotic zone) and in generally cool waters. Stable isotopic compositions of relict and stranded foraminifera indicate that the western portion of the region (the Great Australian Bight) had water of elevated salinity. Environments analogous to outer Shark Bay are interpreted to have formed across the Great Australian Bight during portions of Marine Isotope Stages 2, 3 and 4. Comparison between relatively unaltered Holocene grains and altered late Pleistocene stranded and relict grains reveals pathways of early diagenesis in this cool-water marine realm. Both calcitic and aragonitic biogenic grains display dissolution features. Dissolution of calcitic components over the past ~20,000 years is incomplete (stranded and relict sediments are predominantly Mg-calcite). Aragonitic skeletons, however, are mostly dissolved over this same time period. Contemporaneously, micritic cement also precipitates in this environment, wherein Mg-calcite (~12 mol%) infills skeletal pores of many stranded and most relict skeletons. Similar cement locally precipitates between grains, forming cemented grain aggregates. Mobilization of metals in the slightly reducing pore waters of the southern Australian margin has resulted in the formation of Fe- and Mn-oxides that discolor the stranded and relict grains. Such oxides precipitated on the surface of shells, in empty microbial borings, and in skeletal micropores, scavenge other trace metals, altering the original elemental makeup of these cool-water carbonates. Trace element analysis of Holocene carbonate grains and of living gastropod skeletons indicates that these coatings begin to precipitate during or soon after shell formation. Marine dissolution/precipitation dynamics in addition to mobilization of metals in pore water, fundamentally changes the sedimentological and chemical attributes of these cool-water carbonates on the seafloor soon after deposition.
Download or read book Chemical Diagenesis of Pelagic Biogenic Sediments from the Equatorial Pacific written by Paul Michael Stout and published by . This book was released on 1985 with total page 480 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Late Pleistocene and Postglacial Sedimentation and Stratigraphy of Deep sea Environments Off Oregon written by John Russell Duncan and published by . This book was released on 1968 with total page 484 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Chronology of the Late Pleistocene Holocene Deglaciation in the Ross Sea written by Martin F. Hilfinger and published by . This book was released on 1995 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Diagenesis 11 Early Diagenetic Pore Water sediment Interaction written by R. Hasse and published by . This book was released on 1986 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Late Pleistocene and Holocene History of the Laptev Sea written by Mark Lawrence Holmes and published by . This book was released on 1967 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Recent and Late Pleistocene Sediments from the Eastern Equatorial Pacific Ocean written by Charles Gordon Adelseck and published by . This book was released on 1977 with total page 444 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Petrology and Burial Diagenesis of Plio Pleistocene Sediments Northern Gulf of Mexico written by K. L. Milliken and published by . This book was released on 1985 with total page 262 pages. Available in PDF, EPUB and Kindle. Book excerpt: Plio-Pleistocene sediments and rocks beneath the Louisiana and adjacent Texas shelves are the youngest of several thick packages of terrigenous sediment which prograded into the Gulf of Mexico during the Cenozoic. Comparison of diagenesis in these young sediments (more than 300 samples from 45 wells on the Louisiana-Texas shelf) to diagenesis of older Cenozoic rocks at similar burial depths elsewhere along the Gulf margin confirms that diagenesis is not strictly analogous among the various Cenozoic units. There has been an evolution of diagenesis during filling of the Gulf of Mexico. Differences in diagenesis cannot be attributed to differences in bulk mineralogy of the sands because PIio-Pleistocene sands are lithic arkoses and feldspathic litharenites with essentially the same QFR proportions as observed in subsurface Eocene and Oligocene sandstones along the Texas coast. Unaltered plagioclase is slightly more calcic (average An 24) than unaltered plagioclase in the older rocks. Burial diagenesis in Plio-Pleistocene sediments has involved essentially the same processes as observed in the older rocks, but overall, diagenesis has advanced to a lesser degree at any given depth. Cementation by quartz and carbonate, dissolution of potassium-feldspar and heavy minerals, albitization of plagioclase, and the transformation of smectite to illite have occurred in Plio-Pleistocene sediments, but cements and altered grains are not volumetrically significant shallower than 4 to 4.5 km. The temperature at which reaction of detrital constituents begins (approximately 90° C) is similar to that observed elsewhere in the Gulf, but the zone of reaction is spread over a greater depth range. The similar temperatures observed for the advent of detrital reactions across the Gulf basin suggest that these processes are more highly dependent upon temperature than upon time and that differences observed among the various units may be attributed, at least in part, to variations in the geothermal gradient. The degree of detrital grain alteration observed in these young sediments shows that significant loss of provenance information occurs quite early in the burial history. Alteration in the deep subsurface is very effective in modifying the primary detrital assemblage.
