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Mineralogical Geochemical And Isotopic Tools For The Reconstruction Of Subglacial And Marine Eruptive Paleoenvironments In Antarctica
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Book Synopsis Mineralogical, Geochemical, and Isotopic Tools for the Reconstruction of Subglacial and Marine Eruptive Paleoenvironments in Antarctica by : Maurizio Gemelli
Download or read book Mineralogical, Geochemical, and Isotopic Tools for the Reconstruction of Subglacial and Marine Eruptive Paleoenvironments in Antarctica written by Maurizio Gemelli and published by . This book was released on 2006 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book MARGO written by M. Kucera and published by Elsevier. This book was released on 2006-04-10 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt: MARGO - Multiproxy Approach for the Reconstruction of the Glacial Ocean surface summarizes the results of the MARGO international working group, with the aim to develop an updated and harmonised reconstruction of sea surface temperatures and sea-ice extent of the Last Glacial Maximum oceans. The MARGO approach differs from previous efforts by developing and consistently applying measures of various aspects of reconstruction reliability, and by combining faunal and geochemical proxies. In 14 papers, the volume provides a comprehensive review of earlier work and a series of new, proxy-specific reconstructions based on census counts of planktonic foraminifera, diatoms, radiolaria and dinoflagellate cysts as well as on Mg/Ca measurements in planktonic foraminifera. The approach of harmonising the calibration and application of different proxies is described in detail, various paleothermometry techniques and their results are compared and the challenge of treating sparsely sampled data as the basis for ocean circulation models is addressed. The use of stable oxygen isotope composition of foraminiferal shells as a proxy for past sea water composition is comprehensively reassessed, and a new approach to the transfer function paleothermometer is presented. This volume represents a landmark contribution to the understanding of ice-age oceanography as well as the proxies used to reconstruct past ocean states. The results will form the basis for forcing and validation of ocean circulation models. New regional reconstructions of Last Glacial Maximum ocean temperatures and sea ice cover Compilation of new calibration and fossil datasets as well as documentation of techniques and approaches to paleoenvironmental reconstructions Comparison of techniques, proxies and modelling approaches
Book Synopsis Reconstruction of Antarctic Cenozoic Paleoenvironments Through Palynological Analysis of Subglacial Lake and Ice Stream Sediments by : Patrick Baudoin
Download or read book Reconstruction of Antarctic Cenozoic Paleoenvironments Through Palynological Analysis of Subglacial Lake and Ice Stream Sediments written by Patrick Baudoin and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Paleoenvironment Reconstruction in Extreme Climates Using Organic Geochemical Investigations by : Ross Hamilton Williams
Download or read book Paleoenvironment Reconstruction in Extreme Climates Using Organic Geochemical Investigations written by Ross Hamilton Williams and published by . This book was released on 2016 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt: Organic geochemistry provides researchers with an extensive suite of tools for reconstructing past environments. Using these tools, a set of unique locations situated in climatic extremes have been investigated. During the Early Cenozoic the planet was much warmer than today. In addition to this higher background temperature a series of rapid warming events occurred termed hyperthermals. The largest of these, the Paleocene-Eocene Thermal Maximum is perhaps the best analog to modern day anthropogenic climate change. It is paramount to understand the global effects of this event to elucidate potential changes in our near future. To further this area of research two very different regions were chosen to seek out potential deposits that record the hyperthermals. First, in the Cambay Basin of Western India an extensive core was taken during exploration for lignite deposits. This site would have been near the equator during the time of deposition, a region that is important yet not well established in the current literature pertaining to the hyperthermals. Biostratigraphy and palynology combined with bulk organic carbon isotope records reveals that the lowermost portion of the core likely contains the hyperthermal events. Compound-specific isotopic investigation across multiple realms reveals potential variability of carbon in the ocean-atmosphere system that was then complemented by examination of the corresponding kerogens through application of pyrolysis gas chromatography-mass spectrometry. Expanding upon this study the Canadian High Arctic was assessed in the form of paleosols from Banks Island and shales from Strathcona Fiord. Biomarker distributions revealed a shift in environmental conditions from marine to coastal environments from the Paleocene into the Eocene. Hydrogen isotopic investigation reveals that the nalkanes from paleosols can preserve the same signals as rocks from the same time and that the paleohydrology was far different from present day. Finally, a study was conducted of the recent history of Lagunas Miscanti and Miñiques due to their location at high elevations in the dry Chilean Altiplano. Examination of biomarker distribution as well as associated proxies shows that the lakes have undergone significant changes on centennial time scales along with varying biotic communities, water chemistry and lake level.
Author :Group of Specialists on the Environmental Impact Assessment of Mineral Exploration/Exploitation in Antarctica Publisher : ISBN 13 : Total Pages :114 pages Book Rating :4.3/5 (5 download)
Book Synopsis A Preliminary Assessment of the Environmental Impact of Mineral Exploration, Exploitation in Antarctica by : Group of Specialists on the Environmental Impact Assessment of Mineral Exploration/Exploitation in Antarctica
Download or read book A Preliminary Assessment of the Environmental Impact of Mineral Exploration, Exploitation in Antarctica written by Group of Specialists on the Environmental Impact Assessment of Mineral Exploration/Exploitation in Antarctica and published by . This book was released on 1977 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Paleobiology and Paleoenvironments of Eocene Rocks by : Jeffrey D. Stilwell
Download or read book Paleobiology and Paleoenvironments of Eocene Rocks written by Jeffrey D. Stilwell and published by American Geophysical Union. This book was released on 2000-01-10 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Published by the American Geophysical Union as part of the Antarctic Research Series, Volume 76. Michael K. Brett-Surman, George Washington University, observed that, "being a paleontologist is like being a coroner except all the witnesses are dead and all the evidence has been left out in the rain for 65 million years." In the study of paleontology in Antarctica it could also be added that, if not left out in the rain, most of the evidence remains buried beneath several thousand feet of ice. Elucidating the geologic history of the Antarctic continent will always be plagued with this problem. Nonetheless, numerous clever means have been used to extract as much information as is possible, and as presented in this volume. In this light, one of the most intriguing time intervals in Antarctic history is the Eocene Epoch. During this time, the climatic conditions deteriorated rapidly from the so-called "Greenhouse" conditions that dominated Earth's conditions from mid-Mesozoic time through the early Cenozoic to the "Icehouse" conditions that have dominated the climate since that time. Unfortunately, the record of Eocene rocks on the continent is sparse. On the Antarctic Peninsula, specifically on Seymour Island, a robust record of Eocene rocks and fossils has provided virtually all the information we possess about this time interval. Thus the discovery and description of Eocene erratic boulders in morainal deposits in the McMurdo Sound region provides only the second site on the entire continent where we can study the paleontology of this time interval. In all likelihood, the description of erratics containing fossils from any other place in the world would warrant little study and would attract even less attention. However, when most of the vast area of Antarctica lies beneath ice and when clues to the nature of the crust of that part of the continent can be extracted only from study of erratics, the discovery carries with it some excitement.
Book Synopsis Geochemical Tracers of Holocene Environmental Change Along the East Antarctic Margin by : Natalie Romanoff
Download or read book Geochemical Tracers of Holocene Environmental Change Along the East Antarctic Margin written by Natalie Romanoff and published by . This book was released on 2014 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Antarctic Paleoenvironment by : James P. Kennett
Download or read book The Antarctic Paleoenvironment written by James P. Kennett and published by American Geophysical Union. This book was released on 1992-04-08 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt: Papers based on work presented at a conference held at the University of California, Santa Barbara, August 28-31 1991, entitled 'The Role of the Southern Ocean and Antarctica in Global Change : an Ocean Drilling Perspective.' Papers deal with paleoenvironmental data from the Antarctic, including geology, climate, fossils, sediments and the eustatic record.
Download or read book The Antarctic Paleoenvironment written by and published by . This book was released on 1993 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt: Papers based on work presented at a conference held at the University of California, Santa Barbara, August 28-31 1991, entitled 'The Role of the Southern Ocean and Antarctica in Global Change : an Ocean Drilling Perspective.' Papers deal with paleoenvironmental data from the Antarctic, including geology, climate, fossils, sediments and the eustatic record.
Book Synopsis Paleoenvironmental and Carbon Isotopic Studies ([delta]13Corg) from Terrestrial and Marine Strata Across the Permian-Triassic Boundary in Antarctica and New Zealand by : Evelyn Susanne Krull
Download or read book Paleoenvironmental and Carbon Isotopic Studies ([delta]13Corg) from Terrestrial and Marine Strata Across the Permian-Triassic Boundary in Antarctica and New Zealand written by Evelyn Susanne Krull and published by . This book was released on 1998 with total page 416 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Recent Research on Sedimentology, Stratigraphy, Paleontology, Geochemistry, Volcanology, Tectonics, and Petroleum Geology by : Attila Çiner
Download or read book Recent Research on Sedimentology, Stratigraphy, Paleontology, Geochemistry, Volcanology, Tectonics, and Petroleum Geology written by Attila Çiner and published by Springer. This book was released on 2024-02-17 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is based on the accepted papers for presentation at the 2nd MedGU Annual Meeting, Marrakech 2022. It covers various topics from the fields of (1) sedimentology, stratigraphy, paleontology, (2) geochemistry, mineralogy, petrology, volcanology, (3) structural geology, tectonics, geodynamics, petroleum geology, (4) petroleum and energy sciences and engineering, (5) astrogeology, impact craters and meteorites, and (6) climate and sea level change during the Cenomanian-Turonian Anoxic Event based on a synthesis of sedimentological, micropaleontological, and geochemical records. The content of these papers provides new scientific knowledge based on a series of newest research studies that are relevant to Middle East, Mediterranean region, and Africa.
Book Synopsis Early Paleogene Marine Paleoenvironments by : Aradhna Krishan Tripati
Download or read book Early Paleogene Marine Paleoenvironments written by Aradhna Krishan Tripati and published by . This book was released on 2002 with total page 492 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Marine Geochemical and Micropaleontologic Constraints on Cenozoic Antarctic Cryosphere Evolution by : Christina Rose Riesselman
Download or read book Marine Geochemical and Micropaleontologic Constraints on Cenozoic Antarctic Cryosphere Evolution written by Christina Rose Riesselman and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The Antarctic continent plays a fundamental role in the modulation of global and regional circulation, climate, and sea level. In its present glaciated state, Antarctica increases the Southern Hemisphere temperature gradient, enhancing atmospheric circulation and generating strong, cold winds that contribute to the formation of Antarctic bottom water by cooling surface waters and sustaining sea ice production. Wind intensification may also contribute to an increase in Southern Ocean fertility, both by increasing surface circulation and upwelling at frontal zones, and by transporting iron-rich dust from the continent. On geological timescales, polar ice sheets are a major factor controlling regional and global sea level, planetary albedo, continental weathering rates, and ocean and atmospheric chemistry; each of these factors has the potential to trigger large-scale geochemical or physical feedbacks. Because the Antarctic system exerts such a dramatic influence on the planet as a whole, constraining Antarctic sensitivity to past intervals of rapid global change will directly inform our understanding of the potential for future climate aberrations. Existing paleoclimate reconstructions identify the late Pliocene, ~3 million years ago (Ma), as a promising analog in the recent geologic past for our anticipated planetary future. When forecasting global temperatures over the coming century, even the most conservative climate models predict a range of warming that was last encountered during the mid-Pliocene. The AND-1B marine sediment core, collected by the Antarctic Geological Drilling (ANDRILL) Program from beneath the McMurdo Ice Shelf, represents the most complete record to date of Neogene climate evolution proximal to the Antarctic continent. Diatom-rich lithologic units alternate with glacial sediments throughout the late Pliocene in AND-1B. Each diatom-rich unit within this oscillating record has distinctive geochemical and diatom assemblage characteristics and most are interpreted to preserve the interglacial interval of a 40-thousand-year glacial/interglacial cycle. Chaetoceros resting spore relative abundances, the radiation of a new Fragilariopsis flora, and environmental associations of extant diatoms in assemblages from ~3.2 and 3.0 Ma indicate that late Pliocene cooling initiated in the Ross Sea around 3.2 Ma. Additional environmental constraints are provided by the first-ever Pliocene diatom-bound nitrogen isotope ([lowercase Delta]15N) record of phytoplankton community dynamics and seasonal nutrient availability across the late Pliocene climate transition. Diatom-bound [lowercase Delta]15N in the AND-1B core diverges from bulk sedimentary [lowercase Delta]15N at 2.9 Ma. This divergence is accompanied by changes in the diatom assemblage and increased cyclical variations in bulk carbon isotopes ([lowercase Delta]13C) and sedimentary biogenic silica concentration, implying a shift from an interglacial surface ocean that is stratified by sea ice melt and dominated by diatom productivity prior to 2.9 Ma, to a deeply-mixed modern polynya-style interglacial system, dominated by the prymnesiophyte alga Phaeocystis antarctica, after 2.9 Ma. A broader context for Antarctic glaciation is also presented, using benthic foraminiferal [lowercase Delta]18O and [lowercase Delta]13C and bulk %CaCO3 from ODP Site 1263 to develop the highest-resolution record of the early Oligocene climate transition from the Atlantic Ocean to date. The two-step [lowercase Delta]18O transition, a prominent feature at Pacific Site 1218, is more subtle at Site 1263, suggesting a variable influence of deep water-mass circulation patterns in the two ocean basins across the transition. The pattern of ice accumulation inferred by the gradual-to-rapid transition into Oi-1 supports the influence of hysteresis in the pacing of Oligocene ice growth.
Book Synopsis Sedimentology, Mineralogy and Geochemistry of the Sirius Group and Other Cenozoic Glacigenic Sediments from Antarctica by : Sandra Passchier
Download or read book Sedimentology, Mineralogy and Geochemistry of the Sirius Group and Other Cenozoic Glacigenic Sediments from Antarctica written by Sandra Passchier and published by . This book was released on 2000 with total page 720 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Climate Reconstruction Using Trace Element and Stable Isotope Signatures Preserved in an Early Late Pleistocene Stalagmite from Buckeye Creek Cave, Appalachian Mountains, Southern West Virginia, USA by : Ashley Rachelle Wright
Download or read book Climate Reconstruction Using Trace Element and Stable Isotope Signatures Preserved in an Early Late Pleistocene Stalagmite from Buckeye Creek Cave, Appalachian Mountains, Southern West Virginia, USA written by Ashley Rachelle Wright and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: An early-Late Pleistocene stalagmite was recovered from Buckeye Creek Cave (37°58.57'N, 80°23.98'W), southeastern West Virginia, USA. The growth axis of stalagmite BCC-025 was sampled for ð18O, ð13C, and Sr/Ca of the calcite. A crude age model was developed using two Th-230 ages, from the top (~490 kyrBP) and bottom (~630 kyrBP) of the stalagmite. A more elaborate age model for stalagmite growth was developed using established marine isotope stage (MIS 13/14, 14/15, 15/16) boundaries. Overall, the MIS boundaries approximate the locations of major hiatuses along the axis of stalagmite growth. The proxy records developed from BCC-025 reveal less covariation and overall diminished absolute ranges when compared to younger records, potentially, because the glacial/interglacial variability of the early-Late Pleistocene is less than that of the Late Pleistocene. Despite the need for better age constraints, the observations and interpretations provide an initial window into the drivers and extent of climate change before the more pronounced swings of glacial/interglacial variability of the Late Pleistocene.
Book Synopsis The Geochemical Response of Sedimentary Archives to Rapid Recent Glacier Retreat at the Western Antarctic Peninsula (WAP) by : Patrick Monien
Download or read book The Geochemical Response of Sedimentary Archives to Rapid Recent Glacier Retreat at the Western Antarctic Peninsula (WAP) written by Patrick Monien and published by . This book was released on 2014 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Reconstruction of Sedimentary Environment and Climate Conditions by Multi- Geochemical Investigations of Late Palaeozoic Glacial to Postglacial Sedimentary Sequences from SW-Gondwana by : Kay Scheffler
Download or read book Reconstruction of Sedimentary Environment and Climate Conditions by Multi- Geochemical Investigations of Late Palaeozoic Glacial to Postglacial Sedimentary Sequences from SW-Gondwana written by Kay Scheffler and published by . This book was released on 2004 with total page 213 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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