Komatiites erupted billions of years ago as pulsating streams of white-hot lava. Their unusual chemical compositions and exceptionally high formation temperatures produced highly fluid lava that crystallized as spectacular layered flows. Investigation of the extreme conditions in which komatiites formed provides important evidence about the thermal and chemical evolution of the planet, and the nature of the Precambrian mantle. This monograph, written by three experts with long experience in the field, presents a complete account of the characteristics of komatiites including their volcanic structures, textures, mineralogy and chemical compositions. Models for their formation and eruption are evaluated (including the anhydrous vs. hydrous magmas controversy). A chapter is also devoted to the valuable nickel and copper ore deposits found in komatiites. Komatiite is a key reference for researchers and advanced students interested in petrology, Archaean geology, economic geology, and broad
Clod-kickin’ style for little cowboy feet! Here are well-worn vintage boots and contemporary designs to fire the imagination and carry little feet into the corral and across the open fields. Cute-as-c
What is politics? How is politics different from other spheres of human life? What is behind the debasement of political life today? This book argues that the most illuminating answers to these questions have come from Hannah Arendt. Arendt held that Western philosophy has never had a 'pure concept of the political', and that political philosophers have been guided and misguided by the assumptions implicit in their metaphysical questions. Her project was 'to look at politics … with eyes unclouded by philosophy', and to retrieve the non-theoretical understanding of politics implicit in ancient Greek literature and history. David Arndt's original and accessible study shows how Arendt reworked some of the basic concepts of political philosophy, which in turn led her to a re-interpretation of American political history and even to a profoundly original reading of the US Declaration of Independence.
Welche konkreten Funktionen hatte das Wissen im kolonialen Spanien der frühen Neuzeit? Brendecke analysiert die Beziehungen zwischen Empirie und Macht zur Zeit der spanischen Habsburger und stellt die
