The geological and mineralogical features of the formation Paleoproterozoic corundum-bearing rocks Khitostrov deposit are considered. history is divided into periods characteristics Karelian-Kola sapphire-rubiferous province highlighted. specific genesis complexes in volcanic part Fennoscandinavian Shield marked. Corundum xenoliths alkaline complex Khibiny massif typical Kola Peninsula. In Kare...

Most of the largest volcanoes in México are located at the frontal part of the Trans-Mexican Volcanic Belt and in other isolated areas. This chapter considers some of these volcanoes: Colima, Nevado de Toluca, Popocatépetl, Pico de Orizaba (Citlaltépetl), and Tacaná. El Chichón volcano is also considered within this group because of its catastrophic eruption in 1982. The volcanic edifi ce of th...

In 1988 regional mapping of the central Quesnel belt (the Quesnel Project; Panteleyev, 1987, 1988; Bailey, 1988; Bloodgood, 1988) continued in the Horsefly area (Panteleyev and Hancock, 1989, this volume) and in the Swift River area, north of the Quesnel River (Figure I-l 9I). In the latter area the Mesozoic stratigraphy was mapped to north of the Quesnel-Barkerville Highway (Figure I-19-2) whe...

In this article, for the first time, a comparison is made of magmatic events that occurred in northern and southern framing eastern flank Mongol-Okhotsk orogenic belt. It established these simultaneously. The igneous rocks accompanying are identical their material characteristics. And geochemical characteristics reflect geodynamic processes took place frame Mongolian-Okhotsk belt at end Mesozoi...

Quartz porphyry of rhyolitic composition though a volumetrically minor is an important component metavolcanic successions in the Gadag schist belt western Dharwar craton. The quartz porphyries are calc-alkaline, enriched light rare earth elements (Lan/Ybn ~ 10–20) and with strong negative Eu anomaly (Eu/Eu*N=0.45–0.58). These features, coupled high K2O/Na2O (0.8 to 1.46), low Nb/Th (<1), Lan/Sm...

Scaled analogue models explored the role of different boundary conditions in intra-caldera resurgence processes. Models investigated magma intrusion depth (ID) (Series 1), asymmetric and symmetric caldera collapse 2), as well presence existing discontinuities pre-volcanic substratum 3) on style resurgence. Experimental results indicate that IDs resulted styles structural patterns, which evolved...