The Geological Association of Canada (GAC) recognizes that its field trips may involve hazards to the leaders and participants. It is the policy of the Geological Association of Canada to provide for the safety of participants during field trips, and to take every precaution, reasonable in the circumstances, to ensure that field trips are run with due regard for the safety of leaders and participants.

Gravity-driven fows of material emanating from volcanoes during or following eruptions can range from fowing molten rock to fowing denser-than-air volcanic gas. But the bulk of volcanic fows involve twophase mixtures of solid rock fragments and a fuid—either liquid water or gas composed of air±volcanic gases. Deposits of the various particle–fuid fows derive their physical characteristics from mixture properties and from the particle–fuid interactions involved in both the transport and deposition of the mixtures. Interactions can differ substantially among emplacement processes.

The present study is a report on the volcanic deposits which form the southern part of the Absaroka Range and which occur in the adjoining region in northwestern T/yoraing* This investigation has been undertaken with the object of eliminating discrepancies in correlation within the lower subdivisions of the Absaroka Range, chiefly between the Bighorn and Wind River basins.

Диатомиты - один из важнейших видов нерудных полезных ископаемых многоцелевого назначения, применяются в более чем 200 отраслях народного хозяйства и прежде всего в химической и пищевой промышленности. Обладая высокой пористостью и низким объемным весом, это сырье широко используется для получения фильтров, адсорбентов, тонких абразивов, теплонзоляторов, наполнителей.

Assessment of geological, geochemical and isotopic data indicates that a significant subgroup of volcanichosted massive sulphide (VHMS) deposits has a major or dominant magmatic–hydrothermal source of ore fluids and metals. This group, which is typically characterised by high Cu and Au grades, includes deposits such as those in the Neoarchean Doyon-Bousquet-LaRonde and CambrianMount Lyell districts.

Research on base metal sulfide deposits is among the oldest and best-documented subjects of economic geologists worldwide, considering that copper was first mined about 3000 years ago on the island of Cyprus.

During the past 10 years, after the exciting discovery of active sulfide formation on the modem ocean floor, a considerable flow of new ideas has stimulated and influenced the discussion of oreforming processes for copper-zinc-Iead sulfides in sedimentary and volcanic environments. The development of new genetic concept sconsequently led to reinterpretation of some apparently well-established formation models. <...>

Рассмотрена современная стратиграфия девона Магнитогорской мегазоны. В основе книги — детальное биостратиграфическое исследование вулканогенных и вулканогенно-осадочных рудовмещающих комплексов девона на основе конодонтов.

Вулканиты грабенов Кузнецкого Алатау, основываясь на их девонском возрасте, существенно базальтовом составе и едином ареале развития, считаются комагматами рудоносных щёлочномафитовых плутонов Кузнецко-Алатауской провинции [Гринёв, 1990, 1994; Девонские … , 1996; Уваров Уварова, 2010; Государственная …, 2019 и др.]. При этом плутоны щелочной провинции имеют современный уровень изученности, тогда как вулканиты грабенов до последнего времени оставались изученными на уровне 80-х годов XX века [Гринёв, 1990; 1994; Врублевский, Гертнер, 2021 и др.].