Structure and Emplacement of High-Level Magmatic Systems
There are continual rounds of annual conferences, special sessions and other symposia that provide ample opportunity for researchers to convene and discuss igneous processes. However, the origins of laccoliths and sills continue to inspire and confound geologists.
In one sense, this is surprising. After all, don’t we know all we need to know about these rocks by now? As testified by the diverse range of topics covered in this volume, the answer is clearly ‘no’.
This book contains contributions on physical geology, igneous petrology, volcanology, structural geology, crustal mechanics and geophysics that cover the entire gambit of geological processes associated with the shallow emplacement of magma. High-level intrusions in sedimentary basins can also act as hydrocarbon reservoirs and as sources for thermal maturation.
In drawing together a diversity of perspectives on the emplacement of sills, laccoliths and dykes we hope to advance further our understanding of their behaviour.
Concentric and radial joint systems within basic sills and their associated porosity enhancement, Neuquén Basin, Argentina
Published:January 01, 2008
Adriana Bermúdez, Daniel H. Delpino, 2008. "Concentric and radial joint systems within basic sills and their associated porosity enhancement, Neuquén Basin, Argentina", Structure and Emplacement of High-Level Magmatic Systems, K. Thomson, N. Petford
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One of the remarkable characteristics of the Neuquén Basin is that a group of Cenozoic shallow microgabbroic sills exhibit gas and oil shows, and some have produced hydrocarbons for up to 20 years. Their capacity to act as reservoirs is caused by the increase in the effective porosity owing to the simultaneous development of petrological and fracture processes during cooling that generate systematic variations inside the intrusive bodies.
In this work we describe in detail an unusual intracolumnar joint system formed by two joint sets, referred to here as concentric and radial joint sets. This atypical joint system is...