Download or read book Carbonate Cycles and Clay Mineralogy of Arctic Ocean Sediment Cores written by Dennis Arnold Darby and published by . This book was released on 1971 with total page 266 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Carbonate Cycles in Arctic Ocean Sediment Cores written by Dennis Arnold Darby and published by . This book was released on 197? with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Arctic Ocean Sediments Processes Proxies and Paleoenvironment written by R. Stein and published by Elsevier. This book was released on 2008-07-22 with total page 607 pages. Available in PDF, EPUB and Kindle. Book excerpt: Although it is generally accepted that the Arctic Ocean is a very sensitive and important region for changes in the global climate, this region is the last major physiographic province of the earth whose short-and long-term geological history is much less known in comparison to other ocean regions. This lack of knowledge is mainly caused by the major technological/logistic problems in reaching this harsh, ice-covered region with normal research vessels and in retrieving long and undisturbed sediment cores. During the the last about 20 years, however, several international and multidisciplinary ship expeditions, including the first scientific drilling on Lomonosov Ridge in 2004, a break-through in Arctic research, were carried out into the central Artic and its surrounding shelf seas. Results from these expeditions have greatly advanced our knowledge on Arctic Ocean paleoenvironments. Published syntheses about the knowledge on Arctic Ocean geology, on the other hand, are based on data available prior to 1990. A comprehensive compilation of data on Arctic Ocean paleoenvironment and its short-and long-term variability based on the huge amount of new data including the ACEX drilling data, has not been available yet. With this book, presenting (1) detailed information on glacio-marine sedimentary processes and geological proxies used for paleoenvironmental reconstructions, and (2) detailed geological data on modern environments, Quaternary variability on different time scales as well as the long-term climate history during Mesozoic-Tertiary times, this gap in knowledge will be filled.*Aimed at specialists and graduates *Presents background research, recent developments, and future trends*Written by a leading scholar and industry expert
Download or read book Stratigraphy and Glacial marine Sediments of the Amerasian Basin Central Arctic Ocean written by David L. Clark, Rick R. Whitman, Kirk A. Morgan, Scudder D. Mackey and published by Geological Society of America. This book was released on 1980-01-01 with total page 73 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Paleoclimatic Characterization of Arctic Ocean Sediments Around the Northwind Ridge Using X ray Fluorescence and Visible near Infrared Spectroscopy written by Chandawimal H. E. R. Siriwardana and published by . This book was released on 2011 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Arctic Ocean sediment (AOS) is highly sensitive to global climate changes and has become a focus of much paleoclimatic research. In this study, paleoclimatic characteristics of the AOS have been studied using downcore X-Ray Fluorescence (XRF) data from 13 Healy-Oden TransArctic Expedition cores. Lithological and multi-element variations representing glacial and interglacial cycles were correlated using the variable-based Varimax-rotated Principal Component Analysis (VPCA) of the XRF data. The main components generated by the VPCA have been interpreted as related to terrigenous (erosional) sources (F1, Ti-K-Rb-Fe-Ba-Cr), changes in Laurentide Ice Sheet (LIS) (F3, Ca-P-I), pore water concentration/ biogenic productivity (F5, P-Cl-S), bottom-water ventilation (F6, Mn-Ni-Cu) and siliciclastics (F7, Sr-Zr). Component variations are well consistent with glacial ("gray beds")-interglacial("brown beds") cycles and associated deglacial carbonate pulses in the core 8JPC with identified age controls of Adler et al., 2009 and Polyak et al., 2009. Mn-rich layers (corresponding F6 peaks) of interglacial origin are generally anticorrelated with Ca pulses (F3 peaks) generated during deglaciations. Cl data show general enhancement with interglacials and glacial gray beds with coarse detrital sand pulses suggesting saline pore water trapped within the porosity of these coarser beds. Pleistocene sedimentation is characterized with only a few shallow carbonate spikes, which indicate a weakened Beaufort Gyre and stronger Transpolar Drift as indicated by the lower abundance of Laurentide material in the Eurasian Basin. The Visible-Near Infrared (VNIR) derivative spectroscopy study of the sediment core P1-92AR-P25 (or P25) demonstrates cyclic variations in downcore mineralogy. VPCA of the downcore VNIR data show three mineral assemblages reflecting glacial-interglacial cyclicity. The results are consistent with clay mineral cycles identified by previous studies (Yurco et al. 2010). The downcore mineralogical cyclicity provides a glacial-interglacial portrait of changes in sediment provenance indicative of both Laurentide and Eurasian sources and delivery mechanisms associated with changes in sea level, configurations of Arctic ice sheets and oceanic/atmospheric circulation. The study further reveals that the VNIR spectroscopy can be used as an effective tool in semi quantitative prediction of dolomites. Wavelet analysis in component scores of 8JPC (XRF data) and P25 (VNIR data) identifies significant periodicities; eccentricity (~100 kyr), Obliquity (~40 kyr) and precession (~21 kyr). In both 8JPC and P25 glacial-interglacial variations show eccentricity whereas in 8JPC, LIS changes and biogenic productivity represent precession cycles and in P25 carbonate sedimentation displays strong obliquity (~40 kyr) cycles with moderate influence of precession (~21 kyr) cycles probably representing IRD events in stadial/ interstadial cycles associated with Heinrich and Bond cycles. These findings agree with Adler et al., 2009 that AOS reflects insolation-controlled paleoclimatic processes with longer-term glacial cycles interrupted with abrupt iceberg/melt water discharges of both Laurentide and Eurasian sources. High resolution age control is critical for better evaluation of periodicities of paleoclimatic variations.
Download or read book Geological History of the Polar Oceans Arctic versus Antarctic written by U. Bleil and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 811 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of the NATO Advanced Research Workshop, Bremen, Germany, October 10-14, 1988
Download or read book Investigation of Late Quaternary Paleoceanography and Paleoclimatology written by R. M. Cline and published by Geological Society of America. This book was released on 1976 with total page 636 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Organic Carbon Cycle in the Arctic Ocean written by Rüdiger Stein and published by Springer Science & Business Media. This book was released on 2011-06-27 with total page 394 pages. Available in PDF, EPUB and Kindle. Book excerpt: The flux, preservation, and accumulation of organic carbon in marine systems are controlled by various mechanisms including primary p- duction of the surface water, supply of terrigenous organic matter from the surrounding continents, biogeochemical processes in the water column and at the seafloor, and sedimentation rate. For the world's oceans, phytoplankton productivity is by far the largest organic carbon 9 source, estimated to be about 30 to 50 Gt (10 tonnes) per year (Berger et al. 1989; Hedges and Keil 1995). By comparison, rivers contribute -1 about 0. 15 to 0. 23 Gt y of particulate organi.
Download or read book Stratigraphy and Paleontology of Pliocene to Recent Sediment from the Eastern Alpha Ridge Central Arctic Ocean written by Christine M. Mennicke and published by . This book was released on 1986 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Arctic Ocean written by A. E. M. Nairn and published by Springer. This book was released on 1981-05 with total page 704 pages. Available in PDF, EPUB and Kindle. Book excerpt: This trip backward in time capsulizes in a general way the geologic development of the area that is now northern Alaska. The Cretaceous through Recent history is predominantly one of erosion of the ancient Brooks Range and filling of the Colville Geosyncline under processes like those in Operation today. All the rocks older than Jurassic, however, were deposited far from their present sites. One of the intriguing tectonic puzzles involves the geographic positions and relative timing of events that occurred during the orogeny that built the Brooks Range. I suggest that pre-Cretaceous deposition took place far to the north along the western margin of the Caledonides. Subsequently, the region that is now northern Alaska moved southward and impinged upon a northward moving plate, or plates, from the Pacific region. Interactions between these two major parts of the earth's crust produced the Brooks Range during the Jurassic. Later developments reflect continuing readjustments of the northern third of of thrust Alaska as southward movement was dissipated in diverse systems faulting and lateral displacement. ACKNOWLEDGMENTS I am indebted to many colleagues who, during the past 30 years, shared with me the excitement and pleasures of exploring the geology of northern Alaska. Among these are W. P. Brosge, H. N. Reiser, R. L. Detterman, A. K. Armstrong, A. L. Bowsher, E. G. Sable, I. L. Tailleur, C. G. Mull, M. D. Mangus, A. H. Lachenbruch, M. C. Lachenbruch, R. L. Morris, C. J.
Download or read book Canadian Journal of Earth Sciences written by and published by . This book was released on 2011 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Comparison of Late Pleistocene Arctic Ocean Climates with the O18 Record Using Spectral Analysis written by Robin Francis Boyd and published by . This book was released on 1981 with total page 266 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Recent Benthic Foraminifera from the Central Arctic Ocean written by Martin B. Lagoe and published by . This book was released on 1975 with total page 478 pages. Available in PDF, EPUB and Kindle. Book excerpt: Benthic Foraminifera are present in 97 of 118 samples taken from the central Arctic Ocean. Samples range in depth from 1069 to 3812 meters. Sixty-seven samples contained at least 300 specimens and are termed quantitative samples. The samples were secured from the top three centimeters of sediment cores taken from the Alpha Cordillera, Canada Abyssal Plain and Canada Continental Rise regions of the Arctic Ocean. Seventy-three species of Foraminifera are identified including Triloculina frigida, n. sp.; Chilostomella elongata, n. sp.; and Buliminella elegantissima hensoni, n. var. The fauna is overwhelmingly calcareous and is dominated by the rotaline species Stetsonia horvathi Green, Eponides tumidulus horvathi Green, Eponides tener (Brady) and Epistominella arctica Green.
Download or read book The Arctic Ocean Region written by Arthur Grantz and published by . This book was released on 1990 with total page 664 pages. Available in PDF, EPUB and Kindle. Book excerpt: Summarizes and analyzes the bathymetry, seismicity, regional geophysics, regional geology, and tectonic development of the Arctic Ocean basin and its margins, including the hydrocarbon, gas hydrate, and mineral resource potential.
Download or read book Pliocene and Pleistocene Foraminifera Populations in Arctic Ocean Sediment Cores written by John A. Larson and published by . This book was released on 1973 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Foraminifera populations and distributions of five deep sea sediment cores recovered from the Arctic Ocean yielded data on 126 species of Foraminifera. Abundance data and species appearance and mortality data across geomagnetic reversal intervals in the cores show no positive correlation. Arctic Ocean Foraminifera apparently do not respond in any significant way to magnetic reversals of the earth's magnetic field. (Modified author abstract).
Download or read book Physical Stratigraphy of Pleistocene Sediments from the Central Arctic Ocean written by Scudder Draper Mackey and published by . This book was released on 1977 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Origin and Stratigraphic Significance of Pink Layers in Late Cenozoic Sediments of the Arctic Ocean written by Thomas Frank Hoffman and published by . This book was released on 1972 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt: The study investigates the nature of particular color intervals in deep sea sediment cores from the Arctic Ocean Basin to determine their origin and usefulness in stratigraphic correlation. Peculiar to many of these cores is a thin interval of salmon pink colored sandy lutite about 1-2 centimeters thick. The study obtains detailed information about these pink intervals, including textural, compositional, and stratigraphic relationships.
