Active, dormant, and extinct volcanoes
How do you know your if friendly neighbourhood volcano is dead, or merely dozing?Posted on May 8, 2008 11:19 AM • 4 Comments •
Highly Allochthonous
Vaguely Informed Commentary From the Wide World of Earth Science
Profile
Chris Rowan is a geologist specialising in the dark arts of paleomagnetism, and getting people to pay him to travel to exotic destinations for fieldwork. Having drilled up New Zealand during his PhD, he is now a post-doc at the University of Johannesburg.
What the heck does 'Highly Allochthonous' mean?
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Recent Posts
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- Active, dormant, and extinct volcanoes
- What's up with those Archean sandstones?
- Archean bacterial mats under the hammer
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- Sabbatical
- A planet is for life, not just for Earth Day
- Rock Gallery
- How big was that asteroid? The latest geochemist/geophysicist smackdown
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Geology
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Other Information
volcanoes:
Peperite: a basaltic sneeze into wet sediments
The outcrop that I gave you to ponder on Friday is pretty strange, but I can assure you that this isn't a wall: Most of you correctly guessed that the dark fragments are composed of a mafic (basalt-esque) igneous rock,...Posted on April 8, 2008 9:11 AM • 3 Comments •
Mysterious magma mingling
I was particularly interested to hear everyone's ideas about last Friday's mystery outcrop, as I'm not entirely sure myself about precisely what's going on. Here's what I observed at the time: This locality is in the Johannesburg Dome - a...Posted on February 26, 2008 9:40 AM • 4 Comments •
Into the Bushveld #3: Filthy mineral lucre
Why your car cares about the Bushveld complex.Posted on February 20, 2008 8:59 AM • 1 Comments •
Into the Bushveld #2: 'Look at the size of that thing!'
The world's biggest igneous intrusion is very large indeed...Posted on February 5, 2008 11:00 AM • 1 Comments •
Into the Bushveld #1: holy hunks of magnetite!
Igneous rocks - "sedimentary" processes?Posted on February 4, 2008 10:14 AM • 10 Comments •
A deskcrop-full of komatiite
I have on my desk evidence for a hotter mantle 3 billion years ago. Nifty, eh?Posted on December 14, 2007 10:03 AM • 4 Comments •
Pictures from an undersea eruption
Mid-ocean ridges are a fundamental component of the Earth's tectonic engine: they mark places on the earth's surface where two plates are moving apart, creating space for mantle rocks to move upwards, decompress, and melt. Every year, the resulting...Posted on December 6, 2007 10:22 AM • 1 Comments •
Mount Kelud calms down
The Indonesian Centre for Volcanology and Geological Hazard Mitigation has downgraded the alert level for Mount Kelud, and allowed villagers evacuated from the slopes of the mountain to return to their homes. Since I can't translate Indonesian, I can't give...Posted on November 13, 2007 12:45 PM • 0 Comments •
Kelud and Lusi
It seems that a certain mud volcano is situated less than a 100 km away from the grumbling Mount Kelud, and it is not responding well to the increased geological activity in the area: Separately, a so-called "mud volcano" located...Posted on October 23, 2007 12:23 PM • 0 Comments •
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