Pressure-Temperature-time paths This post is in the middle of a series on metamorphism. Concepts such as metamorphic facies or grade all allow us to link a metamorphic rock to a particular set of conditions, under which it was metamorphosed. This is a simplification, of course. Hold a piece of schist in your hand: we know… Continue reading Metamorphism: Pressure-Temperature-time paths
Category: metamorphism
Metamorphism: grade, zones, index minerals, and whisky
This post is second in a series of posts about metamorphism. Metamorphic grade, zones and index minerals Science is based on a solid understanding of underlying physical principles. Although I have chickened-out of the detail, everything I mention in the previous post is based on a solid understanding of chemistry and physics. The knowledge we… Continue reading Metamorphism: grade, zones, index minerals, and whisky
What you ought to know about metamorphism
I love metamorphic rocks. In hand-specimen they are varied and mysterious, an invitation to do some mineral spotting. In thin-section they are positively gorgeous: solid garnet, foxy biotite (where you can see radiation-damage around zircons), fluffy fibrolite, elusive cordierite… Metamorphic rocks are both attractive and interesting, a compelling combination at any party. They generally aren’t as popular as… Continue reading What you ought to know about metamorphism