Добрый день, Коллеги. Важное сообщение, просьба принять участие. Музей Ферсмана ищет помощь для реставрационных работ в помещении. Подробности по ссылке
The Holocene is the most recent period of the earth’s history, comprising the last 10,000 years. It is characterized by a climate much milder than in the preceding glacial period, during which huge ice caps covered not only Antarctica and Greenland (as today), but also part of North America and of North Europe, as well as several other high latitude and high altitude areas <...>
Remote sensing has been immensely useful in tectonics, structural geology, and geomorphic studies (e.g. Misra et al. 2014; Dasgupta and Mukherjee 2017, 2019; Shaikh et al. 2020; Dasgupta et al. 2022). This edited book consists of 24 chapters authored and co-authored by 53 persons from 21 academic organizations and industries from 7 countries. Misra (2022a; Chapter 1) presents the definition, fundamental processes, and scopes of remote sensing in structural geologic and geomorphologic studies. Misra (2022b; Chapter 2) pens the next introductory chapter, which classifies remote sensing based on data type, source, platform, and imaging media. Gupta and Biswas (2022, Chapter 3) present a morpho-tectonic analysis of a mid-channel bar using remote sensing images from the Jaldhaka river (India). Deota et al. (2022, Chapter 4) present geomorphic indicators of glacier retreat from Jorya-Garang glacier, Baspa Valley (India). They identify different stages of moraines. Jordan (2022, Chapter 5) presents several interesting aerial views of the 2018 Kilauea eruption (U.S.A). Geomorphic features such as lava fissures are documented from images. Awais (2022, Chapter 6) documents different kinds of depositional systems observable in images in Google Earth, viz. different rivers, deltas, lakes, alluvial fans, dunes, and estuaries. Patel et al. (2022, Chapter 7) discuss in detail badland geomorphology from images and several field photos. Their study area was Garbeta (India). Dongare et al. (2022, Chapter 8) discuss the geomorphology of the Indian west coast.
Атлас Ленинградской области является научно-справочным географическим и картографическим произведением, синтезирующим современные знания о природе, населении и хозяйстве региона.
The initial concept of a photographic atlas on fault rocks was developed during informal discussions at the Geological Society of America Penrose Conference "Significance and Petrogenesis of Mylonitic Rocks" held at San Diego, California, in spring 1981, and coconvened by the editors of this book. Many participants felt that a new consensus about mylonites and ductile shear zones had been achieved at the conference, based largely upon the contributions of geoscientists who brought perspectives from the laboratory as well as from the field. In part motivated by the publication (1982) of the Atlas of Deformational and Metamorphic Rock Fabrics (and its predecessor, the Atlas of Rock Cleavage) both edited by G. J. Borradaile, Μ. B. Bayly, and C. McA. Powell, we felt that a collection of photographs of features characteristic of faults and shear zones, ranging in scale from mesoscopic to microscopic to even submicroscopic, together with carefully documented locations and regional (or experimental) information, would provide a valuable reference as well as a teaching device <...>
Orogens in space and time are the potential sources of information in understanding the mechanism of episodic global material circulation on a whole-mantle-scale. They represent the hallmarks of the interaction among lithospheric plates. The word “orogen” is derived from Greece (oros for “mountain,” genesis for origin). The term “orogen” or “orogenic belt” has been traditionally described as a mountain belt composed of different types of rocks or rock strata forming a complex of variable size, typically tens to hundreds of kilometres wide and several thousand kilometre long, later fragmented during younger geological time due to various processes (e.g., Miashiro, 1961). In modern terminology, an orogen can be defined as a major linear deformed zone, sandwiched between cratons with prolonged deformational history, repeatedly reactivated and associated with different events of magmatic pulses and metamorphic episodes in space and time (Dewey and Bird, 1970). An orogen or orogenic belt develops when a continental plate crumples and is pushed upwards to form one or multiple mountain ranges. This involves a series of geological processes called “orogenesis.” <...>
Migmatites are spectacular, complex-looking rocks that can inspire, fascinate, or confuse geologists. All migmatites viewed in an outcrop represent the sum of a series of processes that acted in parallel, or sequentially, and the influence of various local factors (see the photographs in section A). In order to begin to understand the complexity and seemingly endless variety in migmatites, and to provide the reader context for the subject of this book, some of the key factors and processes that make individual migmatites the way they are should be outlined at the outset <...>
This Atlas is designed to be a useful work of reference in an easily-handled format amenable to future expansion both by the E.A.E.G. and the users themselves. It is intended for geoscientists in both the industrial and academic spheres who are at an early career stage, and who would find it of value to see how the interpretation of a wide variety of types of structure is approached on actual examples. The notes accompanying the examples have been kept as concise as is consistent with clarity, and some guidance for further study has been given in the form of a list of key words, and brief references with each group of examples; these in turn will open up the literature.
More than thirty years ago, microprobe analysis introduced the possibility of analyzing quantitatively in situ small surfaces of polished sections, rendering obsolete many of the optical measurements and other data that had been presented in many standard ore-mineralogy textbooks, and thus a new approach to the subject was called for. In addition, it should also be pointed out that whereas many excellent books are available on the mineralogy of ore minerals (see page 218) and a thorough treatment of mineral species is presented in their special sections, it is believed that as microprobe analytical facilities develop and are widely applied, the identification and compositional variation of ore minerals will become more and more a matter of microprobe analysis and x-ray studies. <...>
