Добрый день, Коллеги. Важное сообщение, просьба принять участие. Музей Ферсмана ищет помощь для реставрационных работ в помещении. Подробности по ссылке
Wir verdanken Carl von Linné die erste Klassifkation des Pfanzen- und Tierreiches. Sie stellt ein frühes Musterbeispiel einer wissenschaflichen Systematik dar und zeigt mit ihrem Erfolg gleichzeitig die Bedeutung der Einordnung von Gegenständen eines Wissensgebietes in eine straf gegliederte Hierarchie. Linnés Gliederung galt auch für Fossilien, wurde jedoch nicht mit Erfolg auf die Gesteine angewandt. Seit über 200 Jahren haben Geologen versucht, die scheinbar unendliche Vielfalt der Gesteine in Schubladen zu pressen.
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The objective of this paper is to show how well known the structure is for a particular uranium deposit. After presenting the average vertical variogram for all the holes, some of the individual variograms will be studied and we will show the influence of a few very rich holes on the overall variogram. This turns out to be poorly defined. The first order variogram, which also has been considered, is curiously similar to the usual variogram, whereas the structure of the translated logarithm proves to be better known. <...>
The SEPM/AAPG core workshop "Giant Hydrocarbon Reservoirs of the World: From Rocks to Reservoir Characterization and Modeling" and this companion publication are an attempt to assemble information on giant (>500 MOEB recoverable reserves) reservoirs that is of value to a wide audience. Various examples and methods of reservoir characterization, development, and modeling practices are documented in this volume. Although far from exhaustive, this compilation includes a wide range of reservoirs when examined from any perspective, i.e., location, geology, production history, and characterization. Figure 1 shows the geographic distribution of the reservoir examples that are included in this volume.
Giant (and super-giant) metallic deposits are defined as those that store the trace metal (and some major metal like Fe, Al) equivalent in 1011 (1012) tons of continental crust in Clarke (mean crust content) concentration. Deposits of metallic ores that have very contrasting Clarke values (like Fe, Cu and Au) can be compared on geochemical basis, with political-economic and technologic factors minimized. Under these terms, there are now 1171 giant and 137 supergiant accumulations of 37 metals worldwide, contained in 915 deposits, as several deposits have two or more giant metal accumulations (Olympic Dam has 5).
This book has been written for those interested in, and concerned about, the future sources of metals for the industry, and through it for the rapidly growing population of the world. At present over 95% of the industrial metals come from mines situated on land and the exceptionally large (giant or world-class) deposits contribute the bulk, regardless of where they are located: one of the most practically relevant lessons of globalization. This role of the oversize deposits is projected to persist until at least the end of this century, but finding them is going to be increasingly more costly and will require all the sophistication and effort the exploration community could muster. This requires a solid broad knowledge to identify prospective areas for more detailed exploration, or to evaluate mineral occurrences available for acquisition, based on the time-tested technique of geological analogy. The chance of finding an orebody by accidentally stumbling upon it, or by unsophisticated prospecting, has by now been severely reduced. As mineral exploration is, and will continue to be, mainly precedent-oriented activity, there has been a need for a comprehensive text to provide essential facts about the global distribution of metals now and in the future, above the textbook level.
As explained in Preface, this book is a selfcontained member of a broader knowledge system on the world's mineral deposits and their settings I have been developing and experimenting with for more than 40 years. It is a product of global firsthand information gathering in the field and "data mining" from the literature, followed by sorting and organization into interrelated sets searchable and accessible by the rapidly evolving techniques of modern information technology.