Download or read book Carbon and Water Cycle Reconstructions Across the Cretaceous Paleocene Boundary Through Plant Wax Lipids written by Robert Bourque and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "The Cretaceous-Paleogene extinction has been one of the most heavily studied mass extinction events from the fossil record, with many aspects from the causation and effect of the extinction having been well studied, but with some areas still not having been explored in great detail. After an extended period of warming, there was a cooling event before the K-Pg extinction occurred that lasted for around 100,000 years, with the Chicxulub impact having been followed by a period of instability where plant communities were recovering. While these have been well studied, changes to the global carbon cycle remain uncertain and changes to the global water cycle have received little attention.By studying the isotopic composition of plant wax lipids preserved in sediments from across the K-Pg boundary, it becomes possible to put together a clearer image of how the carbon and water cycles were behaving up to and across the mass extinction event. These sediments were collected from southern Saskatchewan, Canada, with the lipids having been extracted from the sediments and had the abundance of individual lipid chains and isotopic compositions of hydrogen and carbon measured. Modern plant wax fractionation was used as a basis to relate the isotopic values back to the expected values of atmospheric CO2 and rain water, providing a baseline for the carbon and water cycles and observing how they change across time. Inferences on these cycles show the region was characterized by isotopically light rain water but with no long term trends in water isotope composition, while carbon values show cyclicity reminiscent of Milankovitch orbital cycles, with neither isotope record showing long term effects caused by the extinction, suggesting a relatively rapid recovery of within 10,000 years for both cycles"--

Download or read book Vegetation and Environmental Changes Across the Cretaceous Paleogene K Pg Boundary in Northeastern Montana written by Paige K. Wilson Deibel and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Cretaceous-Paleogene (K/Pg) mass extinction was a pivotal event in Earth history; not only did this include the global extinction of non-avian dinosaurs but also the local disappearance of as much as 75% of vertebrate and invertebrate species. Our understanding of plants across the K/Pg is comparatively sparse, despite the central role of plants in shaping terrestrial ecosystems and as a food source. This gap in our understanding of plants across this significant time period motivates my study of plants from a ca. 2.3 Myr time interval around the K/Pg in northeastern Montana. Eleven megafloral localities are discussed here in terms of taxonomic affinities and diversity, morphologic diversity, climate implications, and ecological interpretation. This floral assemblage is also compared with contemporaneous fossil assemblages from around the globe. The earliest fossil assemblage in this study, Seafood Salad, is a particularly diverse, angiosperm-dominated flora, interpreted as a “pre-disaster” community from the Late Cretaceous. The taxa at Seafood Salad are commonly unique (15 of 34 taxa are unique to this study), but the flora broadly shows an affinity with floral assemblages from similar stratigraphic intervals in the region, indicating shared regional taxonomy. The K-Pg event in northeastern Montana culminated in the disappearance of 63% of latest Cretaceous taxa and a ~28% drop in richness. Despite the dramatic turnover at the K-Pg boundary, however, the recovery was relatively rapid; early Paleocene floras regained pre-mass extinction levels of richness within 80 to 900 kyr after the boundary. Some aspects of plant ecological diversity (the diversity of ecological strategies) remained restricted, however, and fast-return taxa continued to dominate the floras. Overall, the plant communities in northeastern Montana experienced a significant restructuring (diminishment of dominant functional groups) even though there was no significant loss of ecomorphological richness and taxonomic diversity rebounded relatively quickly. These results point to a pattern of plant community response during biotic crises: ecological changes and diversity loss, short-term taxonomic decline, but few to no major (family-level) taxonomic extinctions. Moreover, this work indicates global and regional heterogeneity in the extinction magnitude and timing of both extinction and recovery across the K-Pg boundary.

Download or read book Seasonality Across the Cretaceous paleogene Boundary written by Rachel C. Mohr and published by . This book was released on 2018 with total page 346 pages. Available in PDF, EPUB and Kindle. Book excerpt: High-resolution ontogenetic stable isotope (Îþ18O and Îþ13C) analysis of accretionary carbonate bivalve shells can provide subannual records of their environments. These records present an opportunity to better understand the seasonal variation of past climates and environments. Characterizing the seasonality of past environments is especially helpful in resolving subtle changes during intervals of climate change or environmental perturbations such as during extinction events. Late Cretaceous and early Paleogene bivalve shells of Lahillia larseni from Seymour Island, Antarctica, were isotopically sampled at a high ontogenetic resolution in order to characterize the seasonality of this unstable environment for a period of ~1.3 Myr across the Cretaceous-Paleogene (K-Pg) extinction interval. Ontogenetic ÎþB18O profiles support an austral spring or summer season of growth for L. larseni, with the magnitude of seasonal temperature variation experienced during the growing season ranging from 1.6 ℗ł 0.3℗ʻC to 9.5 ℗ł 0.5℗ʻC (1Ï3). The ontogenetic Îþ13C profiles record isotopic variations in the bottom water dissolved inorganic carbon (DIC) reservoir resulting from the seasonal activity of primary producers. Interannual variations in the primary productivity signal are interpreted as possible evidence for a second bloom of productivity in late summer in years with an additional flux of nutrients, and for the delayed onset of primary productivity in years with winter sea ice. Abnormally low Îþ13C values in ontogenetic carbon isotope profiles with large seasonal variation provide evidence for the seasonal cycling of biogenic methane production and oxidation occurring during a ~180 kyr interval across the K-Pg boundary. Stratigraphic trends reveal a sudden 6.8 ℗ł 1.3℗ʻC (1Ï3) warming event across the K-Pg boundary, with a duration of ~100 kyr, similar to previous estimates of warming across the K-Pg. This study, which presents the highest resolution ontogenetic sampling of L. larseni shells, provides new insights into the seasonality of an unstable paleoenvironment with no modern analogue, and highlights the potential for changes in subannual variability to destabilize an environment during an interval of extinction.

Download or read book Understanding Earth s Deep Past written by National Research Council and published by National Academies Press. This book was released on 2011-08-02 with total page 153 pages. Available in PDF, EPUB and Kindle. Book excerpt: There is little dispute within the scientific community that humans are changing Earth's climate on a decadal to century time-scale. By the end of this century, without a reduction in emissions, atmospheric CO2 is projected to increase to levels that Earth has not experienced for more than 30 million years. As greenhouse gas emissions propel Earth toward a warmer climate state, an improved understanding of climate dynamics in warm environments is needed to inform public policy decisions. In Understanding Earth's Deep Past, the National Research Council reports that rocks and sediments that are millions of years old hold clues to how the Earth's future climate would respond in an environment with high levels of atmospheric greenhouse gases. Understanding Earth's Deep Past provides an assessment of both the demonstrated and underdeveloped potential of the deep-time geologic record to inform us about the dynamics of the global climate system. The report describes past climate changes, and discusses potential impacts of high levels of atmospheric greenhouse gases on regional climates, water resources, marine and terrestrial ecosystems, and the cycling of life-sustaining elements. While revealing gaps in scientific knowledge of past climate states, the report highlights a range of high priority research issues with potential for major advances in the scientific understanding of climate processes. This proposed integrated, deep-time climate research program would study how climate responded over Earth's different climate states, examine how climate responds to increased atmospheric carbon dioxide and other greenhouse gases, and clarify the processes that lead to anomalously warm polar and tropical regions and the impact on marine and terrestrial life. In addition to outlining a research agenda, Understanding Earth's Deep Past proposes an implementation strategy that will be an invaluable resource to decision-makers in the field, as well as the research community, advocacy organizations, government agencies, and college professors and students.

Download or read book Carbon Isotope Stratigraphy written by Michael Montenari and published by Academic Press. This book was released on 2020-10-30 with total page 782 pages. Available in PDF, EPUB and Kindle. Book excerpt: Carbon Isotope Stratigraphy, Volume Five in the Advances in Sequence Stratigraphy series, covers research in stratigraphic disciplines, including the most recent developments in the geosciences. This fully commissioned review publication aims to foster and convey progress in stratigraphy with its inclusion of a variety of topics, including Carbon isotope stratigraphy - principles and applications, Interpreting Phanerozoic d13C patterns as periodic glacio-eustatic sequences, Stable carbon isotopes in archaeological plant remains, Review of the Upper Ediacaran-Lower Cambrian Detrital Series in Central and North Iberia: NE Africa as possible Source Area, Calibrating d13C and d18O chemostratigraphic correlations across Cambrian strata of SW, and much more. - Contains contributions from leading authorities in the field - Informs and updates on all the latest developments in the field - Aims to foster and convey progress in stratigraphy, including geochronology, magnetostratigraphy, lithostratigraphy, event-stratigraphy, and more

Download or read book Large Meteorite Impacts and Planetary Evolution IV written by W. U. Reimold and published by Geological Society of America. This book was released on 2010-01-01 with total page 676 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of the Fourth International Conference on Large Meteorite Impacts and Planetary Evolution held at the Vredefort Dome, South Africa, in Aug. 2008.

Download or read book Chemostratigraphy Across Major Chronological Boundaries written by Alcides N. Sial and published by John Wiley & Sons. This book was released on 2018-12-18 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt: Winner of the 2020 PROSE Award for Earth Science! Exploring environmental changes through Earth’s geological history using chemostratigraphy Chemostratigraphy is the study of the chemical characteristics of different rock layers. Decoding this geochemical record across chronostratigraphic boundaries can provide insights into geological history, past climates, and sedimentary processes. Chemostratigraphy Across Major Chronological Boundaries presents state-of-the-art applications of chemostratigraphic methods and demonstrates how chemical signatures can decipher past environmental conditions. Volume highlights include: Presents a global perspective on chronostratigraphic boundaries Describes how different proxies can reveal distinct elemental and isotopic events in the geologic past Examines the Archaean-Paleoproterozoic, Proterozoic-Paleozoic, Paleozoic-Mesozoic, and Mesozoic-Paleogene boundaries Explores cause-and-effect through major, trace, PGE, and REE elemental, stable, and radiogenic isotopes Offers solutions to persistent chemostratigraphic problems on a micro-global scale Geared toward academic and researchgeoscientists, particularly in the fields of sedimentary petrology, stratigraphy, isotope geology, geochemistry, petroleum geology, atmospheric science, oceanography, climate change and environmental science, Chemostratigraphy Across Major Chronological Boundaries offers invaluable insights into environmental evolution and climatic change. Read the Editors' Vox: https://eos.org/editors-vox/unravelling-the-past-using-elements-and-isotopes

Download or read book Limnogeology Progress Challenges and Opportunities written by Michael R. Rosen and published by Springer Nature. This book was released on 2021-04-24 with total page 592 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book honors the career of Professor Elizabeth Gierlowski-Kordesch who was a pioneer and leader in the field of limnogeology since the 1980s. Her work was instrumental in guiding students and professionals in the field until her untimely death in 2016. This collection of chapters was written by her colleagues and students and recognize the important role that Professor Gierlowski-Kordesch had in advancing the field of limnogeology. The chapters show the breadth of her reach as these have been contributed from virtually every continent. This book will be a primary reference for scientists, professionals and graduate students who are interested in the latest advances in limnogeologic processes and basin descriptions in North and South America, Europe, Africa, and China. *Free supplementary material available online for chapters 3,11,12 and 13. Access by searching for the book on link.springer.com

Download or read book Plant Anatomy written by Richard Crang and published by Springer. This book was released on 2018-11-30 with total page 739 pages. Available in PDF, EPUB and Kindle. Book excerpt: Intended as a text for upper-division undergraduates, graduate students and as a potential reference, this broad-scoped resource is extensive in its educational appeal by providing a new concept-based organization with end-of-chapter literature references, self-quizzes, and illustration interpretation. The concept-based, pedagogical approach, in contrast to the classic discipline-based approach, was specifically chosen to make the teaching and learning of plant anatomy more accessible for students. In addition, for instructors whose backgrounds may not primarily be plant anatomy, the features noted above are designed to provide sufficient reference material for organization and class presentation. This text is unique in the extensive use of over 1150 high-resolution color micrographs, color diagrams and scanning electron micrographs. Another feature is frequent side-boxes that highlight the relationship of plant anatomy to specialized investigations in plant molecular biology, classical investigations, functional activities, and research in forestry, environmental studies and genetics, as well as other fields. Each of the 19 richly-illustrated chapters has an abstract, a list of keywords, an introduction, a text body consisting of 10 to 20 concept-based sections, and a list of references and additional readings. At the end of each chapter, the instructor and student will find a section-by-section concept review, concept connections, concept assessment (10 multiple-choice questions), and concept applications. Answers to the assessment material are found in an appendix. An index and a glossary with over 700 defined terms complete the volume.

Download or read book Petroleum Formation and Occurrence written by B.P. Tissot and published by Springer Science & Business Media. This book was released on 2013-11-11 with total page 715 pages. Available in PDF, EPUB and Kindle. Book excerpt: Current and authoritative with many advanced concepts for petroleum geologists, geochemists, geophysicists, or engineers engaged in the search for or production of crude oil and natural gas, or interested in their habitats and the factors that control them, this book is an excellent reference. It is recommended without reservation. AAPG Bulletin.

Download or read book The Arctic in the Anthropocene written by National Research Council and published by National Academies Press. This book was released on 2014-07-31 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt: Once ice-bound, difficult to access, and largely ignored by the rest of the world, the Arctic is now front and center in the midst of many important questions facing the world today. Our daily weather, what we eat, and coastal flooding are all interconnected with the future of the Arctic. The year 2012 was an astounding year for Arctic change. The summer sea ice volume smashed previous records, losing approximately 75 percent of its value since 1980 and half of its areal coverage. Multiple records were also broken when 97 percent of Greenland's surface experienced melt conditions in 2012, the largest melt extent in the satellite era. Receding ice caps in Arctic Canada are now exposing land surfaces that have been continuously ice covered for more than 40,000 years. What happens in the Arctic has far-reaching implications around the world. Loss of snow and ice exacerbates climate change and is the largest contributor to expected global sea level rise during the next century. Ten percent of the world's fish catches comes from Arctic and sub-Arctic waters. The U.S. Geological Survey estimated that up to 13 percent of the world's remaining oil reserves are in the Arctic. The geologic history of the Arctic may hold vital clues about massive volcanic eruptions and the consequent release of massive amount of coal fly ash that is thought to have caused mass extinctions in the distant past. How will these changes affect the rest of Earth? What research should we invest in to best understand this previously hidden land, manage impacts of change on Arctic communities, and cooperate with researchers from other nations? The Arctic in the Anthropocene reviews research questions previously identified by Arctic researchers, and then highlights the new questions that have emerged in the wake of and expectation of further rapid Arctic change, as well as new capabilities to address them. This report is meant to guide future directions in U.S. Arctic research so that research is targeted on critical scientific and societal questions and conducted as effectively as possible. The Arctic in the Anthropocene identifies both a disciplinary and a cross-cutting research strategy for the next 10 to 20 years, and evaluates infrastructure needs and collaboration opportunities. The climate, biology, and society in the Arctic are changing in rapid, complex, and interactive ways. Understanding the Arctic system has never been more critical; thus, Arctic research has never been more important. This report will be a resource for institutions, funders, policy makers, and students. Written in an engaging style, The Arctic in the Anthropocene paints a picture of one of the last unknown places on this planet, and communicates the excitement and importance of the discoveries and challenges that lie ahead.

Download or read book Geology and Mineral Resources of Nigeria written by Nuhu George Obaje and published by Springer. This book was released on 2009-06-18 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt: Contains details on the geological units of Nigeria and the associated mineral resources. The book is divided into three parts. Part 1 discusses the geology of the crystalline rocks and their regional distribution while the sedimentary basins constitute the subject of Part 2. Part 3 takes the mineral resources of Nigeria one on one, their geological environment, mode of occurrence, localities and where possible the reserves estimation. Thereafter, an account of the previous and current mining policies (including that of petroleum) of the Nigerian government is given and goes ahead to list some specific investment opportunities in the solid minerals sector.

Download or read book Encyclopedia of Geochemistry written by William M. White and published by Springer. This book was released on 2018-07-24 with total page 1680 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Encyclopedia is a complete and authoritative reference work for this rapidly evolving field. Over 200 international scientists, each experts in their specialties, have written over 330 separate topics on different aspects of geochemistry including geochemical thermodynamics and kinetics, isotope and organic geochemistry, meteorites and cosmochemistry, the carbon cycle and climate, trace elements, geochemistry of high and low temperature processes, and ore deposition, to name just a few. The geochemical behavior of the elements is described as is the state of the art in analytical geochemistry. Each topic incorporates cross-referencing to related articles, and also has its own reference list to lead the reader to the essential articles within the published literature. The entries are arranged alphabetically, for easy access, and the subject and citation indices are comprehensive and extensive. Geochemistry applies chemical techniques and approaches to understanding the Earth and how it works. It touches upon almost every aspect of earth science, ranging from applied topics such as the search for energy and mineral resources, environmental pollution, and climate change to more basic questions such as the Earth’s origin and composition, the origin and evolution of life, rock weathering and metamorphism, and the pattern of ocean and mantle circulation. Geochemistry allows us to assign absolute ages to events in Earth’s history, to trace the flow of ocean water both now and in the past, trace sediments into subduction zones and arc volcanoes, and trace petroleum to its source rock and ultimately the environment in which it formed. The earliest of evidence of life is chemical and isotopic traces, not fossils, preserved in rocks. Geochemistry has allowed us to unravel the history of the ice ages and thereby deduce their cause. Geochemistry allows us to determine the swings in Earth’s surface temperatures during the ice ages, determine the temperatures and pressures at which rocks have been metamorphosed, and the rates at which ancient magma chambers cooled and crystallized. The field has grown rapidly more sophisticated, in both analytical techniques that can determine elemental concentrations or isotope ratios with exquisite precision and in computational modeling on scales ranging from atomic to planetary.

Download or read book Understanding Climate s Influence on Human Evolution written by National Research Council and published by National Academies Press. This book was released on 2010-04-17 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt: The hominin fossil record documents a history of critical evolutionary events that have ultimately shaped and defined what it means to be human, including the origins of bipedalism; the emergence of our genus Homo; the first use of stone tools; increases in brain size; and the emergence of Homo sapiens, tools, and culture. The Earth's geological record suggests that some evolutionary events were coincident with substantial changes in African and Eurasian climate, raising the possibility that critical junctures in human evolution and behavioral development may have been affected by the environmental characteristics of the areas where hominins evolved. Understanding Climate's Change on Human Evolution explores the opportunities of using scientific research to improve our understanding of how climate may have helped shape our species. Improved climate records for specific regions will be required before it is possible to evaluate how critical resources for hominins, especially water and vegetation, would have been distributed on the landscape during key intervals of hominin history. Existing records contain substantial temporal gaps. The book's initiatives are presented in two major research themes: first, determining the impacts of climate change and climate variability on human evolution and dispersal; and second, integrating climate modeling, environmental records, and biotic responses. Understanding Climate's Change on Human Evolution suggests a new scientific program for international climate and human evolution studies that involve an exploration initiative to locate new fossil sites and to broaden the geographic and temporal sampling of the fossil and archeological record; a comprehensive and integrative scientific drilling program in lakes, lake bed outcrops, and ocean basins surrounding the regions where hominins evolved and a major investment in climate modeling experiments for key time intervals and regions that are critical to understanding human evolution.

Download or read book Introduction to Organic Geochemistry written by Stephen D. Killops and published by John Wiley & Sons. This book was released on 2013-04-16 with total page 673 pages. Available in PDF, EPUB and Kindle. Book excerpt: An Introduction to Organic Geochemistry explores the fate of organic matter of all types, biogenic and man-made, in the Earth System. investigates the variety of pathways and biogeochemical transformations that carbon compounds can experience over a range of time scales and in different environments scope widened to provide a broad and up-to-date background - structured to accommodate readers with varied scientific backgrounds essential terminology is defined fully and boxes are used to explain concepts introduced from other disciplines further study aided by the incorporation of carefully selected literature references It investigates the variety of pathways and biogeochemical transformations that carbon compounds can experience over a range of time scales and in different environments.

Download or read book The Sourcebook for Teaching Science Grades 6 12 written by Norman Herr and published by John Wiley & Sons. This book was released on 2008-08-11 with total page 614 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Sourcebook for Teaching Science is a unique, comprehensive resource designed to give middle and high school science teachers a wealth of information that will enhance any science curriculum. Filled with innovative tools, dynamic activities, and practical lesson plans that are grounded in theory, research, and national standards, the book offers both new and experienced science teachers powerful strategies and original ideas that will enhance the teaching of physics, chemistry, biology, and the earth and space sciences.

Download or read book The Prosopis Julifora Prosopis Pallida Complex written by N. M. Pasiecznik and published by . This book was released on 2001 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt: