The spectacle of explosive volcanic activity has always struck us with a sense of fascination and awe. Stories of the last days of Pompeii and Herculaneum, the massive eruption of Krakatau, and more recently the destruction wrought by Mount St. Helens in Washington and El Chinchon in Mexico have captured the public imagination. This atlas examines the aftermath of such events by looking at the …
The past 25 years have been vast expansion in the field of igneous petrology to accommodate a wide range of new information from both the Earth and other terrestrial planets. This has made the subject far more interesting, but has also resulted in a marked increase in both the amount and the degree of specialization of the available literature.
A study of the product of hydromagmatic activity and their associated xenoliths has been made on the recent volcanic centres on the island of Flores and Faila, in the Azores, in order to define the geothermal context.
This study deals with the massive Elvaberget sulphide deposit, in the southern part of the central skellefte district. The ores as well as the surrounding rocks and alteration zone were studies.
The first is the present statement of the volcanological application ot the SP method. This method is typically used detect hydrothermal zones which exist when two conditions are filled up; presence of a heat source and of a zone with high permeability.