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- On Cu – The Finale:
- James Zehner: Christensen received a lump sum payment of US$75 and also lowers the tensile strength of the... (26 days 12 hours ago)
- Mehrnoosh: Hello dear Nina, I am a mining engineer and also a geologist field, but I am beginner and not... (197 days 16 hours ago)
- Russell Senior: The links you provide should be to the revisions (that is, the diffs between the... (137 days 4 hours ago)
- Lab Lemming: I fixed up “quartz” last night. doesn’t that count for something? (367 days 1 hour ago)
- terry: is the forecast (and prior) Kanto Plain earthquake actually a megathrust quake? I think that should... (379 days 13 hours ago)
- Anne Jefferson: Thanks for this great post. I remember when I took my first geology class and we got to the... (328 days 3 hours ago)
- Nick M.: “What do “good” science standards look like?” As a displaced New York State Earth Science... (343 days 9 hours ago)
- Sarah: You’re welcome! My ideas come somewhat from leading therapy groups as a social worker. I... (413 days 2 hours ago)
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Category Archives: Rocks & minerals
The Charlevoix impact crater
Special thanks to field trip leaders Alain Tremblay and Francine Robert Last month the Canadian Tectonics Group (CTG) held their annual meeting at Charlevoix, Quebec, the site of a Devonian [Lemiux et al. 2003] impact structure. The field trip portion of … Continue reading
Categories: planets, Rocks & minerals
Accretionary wedge #35 – Porphyroblast
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
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
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?
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
Cu – The Finale
(NOTE: I would like to thank Chris @ Highly Allochthonous for giving me this opportunity to cross-post a favorite sedimentary-stratigraphy class project (from 2007) on Earth Science Erratics. All mistakes are mine and I welcome comments. ESE is a great … Continue reading
Categories: Ore geology, Rocks & minerals
Still Wondering About Cu?
(NOTE: This is the second in a series of three posts on copper mineralization in skarn.) As a geology student several years ago, I had wondered why copper (chemical symbol Cu) shows up where it does. I had wondered how … Continue reading
Categories: Ore geology, Rocks & minerals
What’s Up With Cu?
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
Impacts and Geology: from lahar to suevite
As I’ve written before, the last 30 years has seen a big change in the way Geologists think about the Earth; this planet of ours does not sit in isolation in the Universe but is frequently hit and changed by meteorites … Continue reading
Categories: planets, Rocks & minerals