
Warrenheip erupted violently. Its a scoria cone, also known as a cinder cone, or pyroclastic cone. These volcanoes build up slowly during an eruption, as more and more material is violently expelled out of the central eruptive vent. Eventually the very steep hills began to slump, and the buildup of pressure led to the culmination of this event. A spectacular explosive eruption occurred, blowing out the side of the volcano, and turning the conical O shape that it once had, into a U shape. Following this, large lava flows were released upon the northern parts of Warrenheip, where they flowed into the eastern most stretches of the Yarrowee river, meeting with the outside stretches of Brown Hill, before largely stopping there.
Contrary to popular belief, Mount Warrenheip is not directly responsible for burying the Eureka deep lead. Instead, it did bury many rivers, but these rivers were those that flowed nearer to Warrenheip. The Eureka did not flow near enough to Mount Warrenheip to be covered by an eruption, and the topographical height where it began also does not correspond to an area that the flows released by Warrenheip travelled. The actual flows didn't really even travel that far to begin with, most likely as a result of the slightly higher level of silica that the magma retained, which was evident by the fact that Warrenheip was constructed from explosive processes rather than effusive ones.
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OzGeology is an Australian-based YouTube channel that specializes in creating high-quality documentaries on Earth sciences and natural disasters. The content is designed to be easy to digest and covers a wide range of topics, not only focusing on geology but occasionally exploring other scientific areas as well.
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Ed Dunens
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