Geonetzwerk.org recently published the complete results of the geoblog survey (2009). The authors Dr. Robert Huber (MARUM, Bremen), Callan Bentley (Northern Virginia Community College, USA) und Lutz Geißler outline the social and demographical makeup of the Geoblogosphere and provide an interesting insight into the motivation of the geobloggers.
Study “The state of the Geoblogosphere – geoscience communication in the social web”…
As a follow-up of the workshop at the GeoDarmstadt2010, where we learned about manifold experiences in geoscientific public work in the field, this time we intent to focus on the elaboration of a white paper helping to find the best way of practicing a target group-related transfer of geoscientific knowledge to the interested public. Read the rest of this entry »
A friend recommended a video showing impressive large quartz crystals. They were found in the Coleman Quartz Mine in Arksansas, USA. As far as I know these clear quartzes were formed by hydrothermal processes and are bound to large fault zones within Ordivician sandstones. Read the rest of this entry »
“Geochemistry of European Bottled Water” is a forthcoming book of Borntraeger Science Publishers. Clemens Reimann and Manfred Birke (Eds.) summarize the data of a large research project during which a group of European geochemists investigated 1,785 bottled water samples from 38 different countries, 1,247 water sources at 884 locations. 
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A comment on Facebook gave me the idea to create a list of celebrities with parents, childs or other relatives who are connected with geosciences. Did you know that Keanu Reeves‘ father has been a geologist? Such a compilation is only realizable with the help of you. Read the rest of this entry »
The 9th Freiberg Short Course in Economic Geology will take place from 6th to 10th December and is dedicated to magmatic Ni-Cu-PGE deposits, their petrogenesis and exploration. Read the rest of this entry »
Gold-bearing quartz veins related to the orogenic gold type are typically ribboned as known from my research area northern California. The ribbons there are formed by vein-parallel shear planes, dividing the quartz in decimeter to micrometer thick bands. Ore-bearing fluids intruded the shear planes several times. This multi-stage mineralization is verified by microscopic investigation of gold ore. In most cases gold and galena are the last species deposited in the veins. The veins occur dominantly at intensely sheared lithological contacts.
A result of these observations is that the deposits developed in an active tectonic environment with multiple stages of fluctuating fluid influx in depths characterized by brittle deformation.
To improve my own understanding of fluid migration processes in hydrothermal systems I will try to summarize some general thoughts I worked off for myself from Cox et al. (2001) and, in part, from Yardley (1983). This is certainly not a complete overview of the topic. So don’t hesitate to post critical questions, remarks or further arguments and ideas. Read the rest of this entry »
It has been a fierce competition with high-quality mining photographs. My photos did not win, but there is a chance in the people’s choice category. The online-voting opens today. I would like to invite you to vote for your favorite mining photograph. Please spread this information. Thanks!
Addition: I have been too hasty… my photographs were not chosen for online voting, but don’t hessitate to vote for the other fantastic submissions!
Strom wird immer teurer. Wir empfehlen hier einen Vergleich der Strompreise deutscher Stromanbieter.
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