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Gold/Mining/Energy : Gold and Silver Juniors, Mid-tiers and Producers

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To: hank2010 who wrote (32157)	2/7/2007 10:24:03 PM
From: E. Charters	Read Replies (1) of 78420

In 1959 the first man-made shatter cone was produced during an underground nuclear explosion. Years of hunting for and careful mapping of shatter cones and their orientations shows that the apex of these cones (from all sides of an impact site) combine to point out the exact center of impact. Consequently, in the early 1960's shatter cones and impact minerals were both considered adequate criteria for suggesting an impact site (Mark, 1987). Impact melt theorists umich.edu Explosions and astroblemes, similarities blackwell-synergy.com Big Bangs GEOLOGIC SETTING Krakatau (Krakatoa) is one of the volcanoes of the Sunda volcanic arc in Indonesia, located in the Sunda Strait, at 16.7 S. Latitude and 105.4 E. Longitude, 40 km off the west coast of Java. The stratovolcano was formed by the subduction of the Indian-Australia Plate under the Eurasian Plate. Great volcanic eruptions have occurred in this region in the distant geologic past. A mega-colossal volcanic explosion/collapse during the Quaternary period of the Ice Age, approximately 75,000 years ago, devastated the center of the island of Sumatra and created a 100 km long caldera, now the site of Lake Toba. The volume of tephra discharge from this massive volcanic eruption is estimated at 2,000 cubic km. The massive 1815 Ultra-Plinian eruption/explosion of the Mount Tambora volcano ejected between 100 and 200 cubic kilometers of tephra.

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