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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...

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