Download or read book Miocene Sediments of the Equatorial Pacific Ocean written by Dean Alan Dunn and published by . This book was released on 1982 with total page 604 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Equatorial Pacific Sediment Deposition During the Early to Middle Miocene written by Christine Marie Piela and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The equatorial Pacific is a major region of biological production in the world oceans and an important part of the global carbon cycle. Changes in climate during the Cenozoic (65 Ma to present) have impacted the carbon cycle, and it is important to assess these impacts. This study focuses on the primary productivity of the equatorial Pacific during the early to middle Miocene (24 - 12 Ma) as recorded by Deep Sea Drilling Project (DSDP) Site 574, and investigates the sedimentary components potentially linked to productivity: bio-Ba, bio-SiO2, Corg, CaCO3, and uranium, as well as detrital thorium to estimate clay-bound barium. Within this time frame the plate beneath Site 574 traveled northwesterly across the equator and allows a unique opportunity to monitor changes in productivity and the carbon cycle in this region. It is difficult to determine directly primary productivity from the sedimentary record because the preservation of different proxies for this parameter - Corg, bio-CaCO3, and bio-SiO2, can be highly variable. The variability has many causes, including nutrient recycling in the water column and the depth of the carbonate compensation depth (CCD), which prevents the preservation and ultimate burial of plankton debris at the seafloor. To interpret the production versus deposition rates during the early and middle Miocene, proxies were used in conjunction with direct measurements of biogenic remains. By determining the concentrations of biogenically produced barium (bio-Ba), which is less affected by degradation, it is evident that the mass of Corg produced was much greater than that preserved in the sediments. We observed higher deposition of bio-Ba and bio- SiO2 as the site was transported over the equatorial divergence by plate tectonics, as expected. In contrast, CaCO3, accumulation was low in the divergence region, and coincides with a dissolution event known from other site studies in the equatorial Pacific. The pattern of uranium deposition resembles CaCO3 and Corg, and average U concentrations suggest that it was primarily deposited as a trace element in the shell material of biogenic carbonate. Corg also resembles CaCO3 and appears to represent primarily a dissolution signal. Total uranium analysis proved to be a useful proxy for Corg and CaCO3 preservation, and analysis of detrital thorium (232Th) concentration suggests very limited terrigenous clay input. Comparison of the different proxies reveals carbonate preservation events, changes in Corg preservation, and changes in deposition as DSDP Site 574 migrated northwesterly across the equator.
Download or read book The Miocene Ocean written by James P. Kennett and published by Geological Society of America. This book was released on 1985 with total page 518 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Mineralogy of Cenozoic Deep sea Sediments from the Equatorial Pacific Ocean written by George Ross Heath and published by . This book was released on 1968 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Marine Geology and Oceanography of the Pacific Manganese Nodule Province written by James L. Bischoff and published by Springer Science & Business Media. This book was released on 2013-03-08 with total page 839 pages. Available in PDF, EPUB and Kindle. Book excerpt: Deep-sea manganese nodules, once an obscure scientific curios ity, have, in the brief span of two decades, become a potential mineral resource of major importance. Nodules that cover the sea floor of the tropical North Pacific may represent a vast ore de posit of manganese, nickel, cobalt, and copper. Modern technology has apparently surmounted the incredible problem of recovering nodules in water depths of 5000 meters and the extraction of metals from the complex chemical nodule matrix is a reality. Both the recovery and the extraction appear to be economically feasible. Exploitation of this resource is, however, hindered more by the lack of an international legal structure allowing for recognition of mining sites and exploitation rights, than by any other factor. Often, when a mineral deposit becomes identified as an ex ploitable resource, scientific study burgeons. Interest in the nature and genesis of the deposit increases and much is learned from large scale exploration. The case is self evident for petrol eum and ore deposits on land. The study of manganese nodules is just now entering this phase. What was the esoteric field of a few scientists has become the subject of active exploration and research by most of the industrialized nations. Unfortunately for our general understanding of manganese nodules, exploration results remain largely proprietary. However, scientific study has greatly increased and the results are becoming widely available.
Download or read book Cenozoic History and Paleoceanography of the Central Equatorial Pacific Ocean written by Tjeerd Hendrik Van Andel and published by Geological Society of America. This book was released on 1975 with total page 231 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Marine Science written by and published by . This book was released on 1974 with total page 862 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Early Miocene Rates of Faunal Change and Foraminiferal Preservational Facies Equatorial Pacific Ocean written by John Murray Quinn and published by . This book was released on 1982 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Deep sea Sedimentation and Cenozoic Stratigraphy in the Central Equatorial Pacific written by Theodore Carlton Moore and published by . This book was released on 1968 with total page 390 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Paleoredox and Color Change in Equatorial Pacific Sediments written by Wendy E. C. Kordesch and published by . This book was released on 2011 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Correlation of Cenozoic Deep Sea Sediments of the Equatorial Pacific Ocean written by Richard G. Blank and published by . This book was released on 1977 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Sedimentation and Mineral Deposits in the Southwestern Pacific Ocean written by David Spencer Cronan and published by . This book was released on 1986 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Oligocene Marine Diatoms Recovered in Dredge Samples from the Navarin Basin Province Bering Sea written by Jack G. Baldauf and published by . This book was released on 1987 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Stratigraphy of Geo and Biodynamic Processes written by Michael Montenari and published by Elsevier. This book was released on 2023-10-01 with total page 458 pages. Available in PDF, EPUB and Kindle. Book excerpt: Approx.506 pages Approx.506 pages
Download or read book Middle to Late Miocene Palaeoceanography of the Equatorial Pacific Ocean written by Paul Minton and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Oligocene and Lower Miocene Radiolaria in Tropical Pacific Sediments written by W. R. Riedel and published by . This book was released on 1959 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Proceedings of the Ocean Drilling Program written by Ocean Drilling Program and published by . This book was released on 1997 with total page 524 pages. Available in PDF, EPUB and Kindle. Book excerpt:
