I read a good article about the geology of the antarctic peninsula and the facts discovered surrounding the mesozoic-cenezoic subduction of the pacific ocean floor. The rocks found are similar to the Andean rocks of south america, which contain calcareous-alkaline remnants of now fragmented western margin of Gondwana extending from south america to the antarctic [...]
Archive for September, 2009
Variation in amphibole composition from the Andean Intrusive Suite across the Antartic Peninsula
Posted in Uncategorized, tagged petrology on September 29, 2009 | Leave a Comment »
Ol Doinyo Lengai Volcano – Eruption Effects
Posted in Uncategorized on September 23, 2009 | Leave a Comment »
Ol Doinyo Langai is a volcano in Tanzania that erupts with natrocarbonatite lava, which is rich in calcium, sodium, and potassium, and low in silica. Because this volcano is low in silica the lava is cool. It alternates between effusive eruptions and explosive eruptions that build large cinder and ash cones.
For the effusive erutpions, the [...]
Finding diamonds in Wyoming and Colorado
Posted in Uncategorized on September 22, 2009 | Leave a Comment »
In Colorado and Wyoming Diamonds have been found in 40 known diamond containing kimberlite pipes. Diamonds are very rare because the conditions suitable for their formation are also rare. The kimberlite pipes are vertical columns that were squeezed up from great depths(over 150 km deep) within the mantle, and these kimberlites have been deeply eroded (possibly 2000- [...]
Graph paper!
Posted in Uncategorized, tagged Mineralogy, petrology, websites on September 17, 2009 | Leave a Comment »
All right, this might not make your day, but I have to say that finding the http://www.waterproof-paper.com/graph-paper/ made me really, really happy. I’ve searched high and low for ternary paper on occasion, but now I have a pdf! Unfortunately, all of their grid paper is in inches not mm, but you can’t have [...]
The largest eruption in recorded history
Posted in Uncategorized on September 10, 2009 | Leave a Comment »
In the Sunda Islands in Indonesia on April 10, 1815 the Tambora Volcano eruption occurred and it was so loud that it could be heard from 3000 miles away in India. The blast ejected 150 cubic kilometers of tephra into the atmosphere, and ash from the eruption was found up to 1300 kilometers away from [...]
