Добрый день, Коллеги. Важное сообщение, просьба принять участие. Музей Ферсмана ищет помощь для реставрационных работ в помещении. Подробности по ссылке
(1)Metamorphic rock complexes with a density of about 3 g/cm3 under standard atmospheric pressure are a prevailing type of petrographic associations found in that part of the earth’s crust which is available to direct observation.
(2)Presumed rock densities within the deeper parts of the earth’s crust, when based upon the values of elastic wave velocities in a sample as well as within a massif, are not sufficiently reliable for an undeniable conclusion to be drawn about the petrographic composition of geophysical “layers” in the earth’s crust.
В сборнике освещены вопросы геологического строения и типы пород литологических формаций докембрия КМА, дана сравнительная характеристика акцессорных минералов в них. Рассматриваются этапность порообразования, литология и палеогеография осадочных образований антеклизы, тектонический контроль распределения фаций в юрское и фаменское время. Ряд статей посвящен минералогии и химизму осадочных пород, их эпигенетическим изменениям. Дана оценка перспектив на поиски железных руд, осадочных бокситов, титан-циркониевых россыпей, бентонитовых глин.
Сборник рассчитан на широкий круг геологов, занимающихся вопросами литологии, палеогеографии, формирования и размещения полезных ископаемых осадочного генезиса.
Knowledge of the geology of the Australasian region has expanded apace since the end ofWorld War II as a result of two main factors—the extensive programme of reconnaissance mapping being carried out by the Common wealth Bureau of Mineral Resources and the various State Geological Surveys, and the 1:250,000 mapping project of the New Zealand Geological Survey, on the one hand, and the increased activity of oil and mining companies, particularly in geophysical and drilling work, on the other. All phases of this work are still proceeding and no doubt will continue, perhaps at an increasing rate.
Proterozoic tectonic evolution of the Grenville orogen in North America: An introduction
Richard R Tollo, Louise Corriveau, James McLelland, and Mervin J. Bartholomew
Canadian Grenville Province
7. Cordierite-orthopyroxene white gneiss: A key to unveiling premetamorphic hydrothermal activity in the Bondy gneiss complex, Grenville Province, Quebec
Olivier Blein, Louise Corriveau, and Marc R.-LaFleche
2. Granulite-facies P-T-t paths and the influence of retrograde cation diffusion during polyphase orogenesis, western Grenville Province, Quebec
Katherine J.E. Boggs and Louise Corriveau
3. Mesoproterozoic basement of the Lac St. Jean Anorthosite Suite and younger Grenvillian intrusions in the Saguenay region, Quebec: Structural relationships and U-Pb geochronology
Claude Hebert and Otto van Breemen
4. Low-variance sapphirine-bearing assemblages from Wilson Lake, Grenville Province of Labrador
A session on ‘The Australian Plate’ was held at the 15th Australian Geological Convention in Sydney in July 2000. At that session it was clear that the 1990s had seen an explosion of new geophysical, geochemical and geological data for the Australian continent, and indeed for the wider plate. Further it was clear that the application of new interpretation techniques in the earth sciences, especially numerical modelling, to these improved datasets was yielding a vastly improved level of understanding of the evolution and dynamics of the Australian Plate. This volume stemmed from the realisation that combining these new data and interpretations into a single volume would provide both a much-needed description of the current ‘state-ofthe-science’ and also help reveal the new directions required to further illuminate the evolution and dynamics of the Australian Plate.
The area of south-west England described in this handbook (Fig. 1) embraces Cornwall, Devon, part of Somerset and the Scilly Isles; it is bounded by the Atlantic, the Bristol Channel and the English Channel, and to the east by an arbitrary line from the Parrett estuary to Charmouth. Nowhere in the peninsula is the sea more than 25 miles distant and the maritime climate is characterized by milder winters and cooler summers than obtain over much of Britain. However, the strong, predominantly westerly winds bring much rain, about 40 inches a year in low-lying inland areas and more than 80 inches on high Dartmoor, and the popular phrase ‘English Riviera’ can be applied with some justice only to south Cornwall and the Scillies. <...>
Нa протяжении неогея на Омолонском массиве (Ом) неоднократно формировались ассоциации изверженных пород кислого, среднего, основного, ультраосновного и щелочного состава, занимающие ныне около 40% его площади. В истории их формирования различается два цикла, каждый из которых начинался слабым базитовым и ульт-ракафитовым магматизмом, а завершался кислым - средним вулка -низмом и образованием гранитоидов. На фоне обрамляющих складчатых структур магматические породы Ом и ряда других срединных массивов выделяются более кислым (особенно на ранних стадиях развития сингеосинклинального чехла), щелочным и калиевым характером. Общая эволюция магматизма Ом имела антидромную, а в обрамляющих структурах - гомодромную направленность. Магматическая активность носила резонансный характер.
