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Author: Isabel Urbat Publisher: Sudwestdeutscher Verlag Fur Hochschulschriften AG ISBN: 9783838117232 Category : Languages : en Pages : 172
Book Description
The Cretaceous OAE 1b is one of the major perturbations of the global carbon cycle. It is documented in Albian deposits from the Atlantic regions as well as in regions of the Western Tethys. High-resolution geochemical profiles show, that the perturbation of the carbon cycle occurred synchronously in the oceanic- and atmospheric carbon reservoirs. This is indicated by the stable isotopic composition of biomarkers for terrestrial higher plant waxes and marine algal lipids. The climate system in the tropics responded with a rapid rise in sea surface temperature (SST). Climate proxies indicate a shift towards more humid climate conditions. The effects of this major perturbation of the climate had also consequences for the biota. At the Mazagan Plateau the organic matter production increased even though the upwelling weakened probably due to an increased influx of nutrients from the adjacent African Continent. The bioproduction of the Vocontian Basin shifted towards bacterial dominated communities. These major perturbations of the carbon cycle had complex effects in different regions of the Lower Albian tropics.
Author: Isabel Urbat Publisher: Sudwestdeutscher Verlag Fur Hochschulschriften AG ISBN: 9783838117232 Category : Languages : en Pages : 172
Book Description
The Cretaceous OAE 1b is one of the major perturbations of the global carbon cycle. It is documented in Albian deposits from the Atlantic regions as well as in regions of the Western Tethys. High-resolution geochemical profiles show, that the perturbation of the carbon cycle occurred synchronously in the oceanic- and atmospheric carbon reservoirs. This is indicated by the stable isotopic composition of biomarkers for terrestrial higher plant waxes and marine algal lipids. The climate system in the tropics responded with a rapid rise in sea surface temperature (SST). Climate proxies indicate a shift towards more humid climate conditions. The effects of this major perturbation of the climate had also consequences for the biota. At the Mazagan Plateau the organic matter production increased even though the upwelling weakened probably due to an increased influx of nutrients from the adjacent African Continent. The bioproduction of the Vocontian Basin shifted towards bacterial dominated communities. These major perturbations of the carbon cycle had complex effects in different regions of the Lower Albian tropics.
Author: Nicholas Bennett Harris Publisher: SEPM Soc for Sed Geology ISBN: Category : Nature Languages : en Pages : 296
Book Description
Depositional models for organic-carbon-rich sediments have been the subjects of both great interest and great controversy for many years. These sediments serve as the ultimate source of virtually all oil and gas. They also represent the interface between biological and geological processes and provide critical evidence for the state of the atmosphere and oceans. Yet despite their importance and decades of research, the origin of these sediments remains the source of vigorous disagreement. The twelve papers in this volume represent the cutting edge of research in this topic. They explore the origin of organic-carbon-rich sediments through a variety of techniques, including sedimentology, geochemistry, paleontology and computer modeling. All papers take multidisciplinary approaches to the topic, and together, they demonstrate the complex interconnected processes that trigger the deposition of organic carbon. This book will appeal to geoscientists in many disciplines, including explorers for petroleum who need models for source rock deposition, organic and inorganic geochemists who study processes in water and sediment, sedimentologists who interpret ancient deposition environments, and climatologists and oceanographers who reconstruct the behavior of the ancient atmosphere and oceans.
Author: Robert N. Ginsburg Publisher: Springer Science & Business Media ISBN: 9780792306306 Category : Science Languages : en Pages : 390
Book Description
' this volume represents perhaps the best available report on state-of-the-science cretaceous research. Some may query the wisdom of grand schemes such as the GSGP, believing that science is best left to the imaginative individual. This useful volume offers a persuasive counter-argument. That it speaks with many voices (if not languages) is to be expected and indeed adds to its strength.' Cretaceous Research 11, 1990
Author: Richard E. Ernst Publisher: Cambridge University Press ISBN: 1316060519 Category : Science Languages : en Pages : 667
Book Description
Large igneous provinces (LIPs) are intraplate magmatic events, involving volumes of mainly mafic magma upwards of 100,000 km3, and often above 1 million km3. They are linked to continental break-up, global environmental catastrophes, regional uplift and a variety of ore deposit types. In this up-to-date, fascinating book, leading expert Richard E. Ernst explores all aspects of LIPs, beginning by introducing their definition and essential characteristics. Topics covered include continental and oceanic LIPs; their origins, structures, and geochemistry; geological and environmental effects; association with silicic, carbonatite and kimberlite magmatism; and analogues of LIPs in the Archean, and on other planets. The book concludes with an assessment of LIPs' influence on natural resources such as mineral deposits, petroleum and aquifers. This is a one-stop resource for researchers and graduate students in a wide range of disciplines, including tectonics, igneous petrology, geochemistry, geophysics, Earth history, and planetary geology, and for mining industry professionals.
Author: Thierry Adatte Publisher: Geological Society of America ISBN: 0813725445 Category : Science Languages : en Pages : 245
Book Description
"This volume covers new developments and research on mass extinctions, volcanism, and impacts. It addresses the following topics: the Central Iapetus magmatic province; thermogenic degassing in large igneous provinces; global mercury enrichment in Valanginian sediments; Guerrero-Morelos carbonate platform response to the Caribbean-Colombian Cretaceous large igneous province; implications for the Cretaceous-Paleocene boundary event in shallow platform environments and correlation to the deep sea; environmental effects of Deccan volcanism on biotic transformations and attendant Cretaceous/Paleogene boundary mass extinction in the Indian subcontinent; Deccan red boles; and factors leading to the collapse of producers during the Chicxulub impact and Deccan Traps eruptions"--
Author: National Research Council Publisher: National Academies Press ISBN: 0309209196 Category : Science Languages : en Pages : 153
Book Description
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.
Author: Isabel Urbat
Author: Isabel Urbat
Author: P. W. Skelton
Author: Nicholas Bennett Harris
Author: Xiumian Hu
Author: Robert N. Ginsburg
Author: Richard E. Ernst
Author: Thierry Adatte
Author: Emile A. Pessagno
Author: National Research Council
Author: Alain Yves Huc