Tag Archives: geology

Accretionary wedge #35 – Porphyroblast

Posted on June 25, 2011 by Metageologist
Metageologist

I like long words (I might even say I was egregiously polysyllabic in my discourse) and when Accretionary Wedge #35 asked me for my favourite geological word I knew it had to be one of those compound names based on … Continue reading →

Categories: Rocks & minerals

Chalk is weird

Posted on May 22, 2011 by Metageologist
Metageologist

Sometimes you live with something and regard it as normal, dull, quotidian, jejune, blah or maybe just meh. Then one day you suddenly get a moment of clarity and realise that actually, it is really weird. Subtly weird perhaps, but … Continue reading →

Categories: Rocks & minerals, Uncategorized

Impact and Geology: spherules rule

Posted on April 22, 2011 by Metageologist
Metageologist

One of the most striking changes in Earth Science in the last 20 years has been the way meteorite and associated impacts (or bolides and astroblemes, if you prefer) are viewed by Geologists. In the dark days of the 1990s … Continue reading →

Categories: planets, Rocks & minerals

Impacts and Geology: deep peace?

Posted on March 22, 2011 by Metageologist
Metageologist

Metamorphic rocks typically come from deep in the earth and form slowly. Simple physics shows that transferring heat into large volumes of rock (a key driver of many types of metamorphism) takes millions of years. Rocks that form the deep … Continue reading →

Categories: planets, Rocks & minerals

What’s Up With Cu?

Posted on February 2, 2011 by Nina Fitzgerald
Nina Fitzgerald

Since returning two weeks ago from my four-day hiking extravaganza in southern Nevada and northwest Arizona, I have been doing a lot of thinking about mining and its long history in that part of the country.  In Arizona, in particular, … Continue reading →

Categories: Ore geology, Rocks & minerals