Understanding explosive volcanic eruptions and caldera formation in the Oslo Rift

Several large calderas were formed in the Permian Oslo Rift. These are characterized by ring faults and a large variety of intrusive igneous rocks, including ring dikes and breccias. These calderas likely contained crater deposits, now removed by erosion. For this reason, only limited information is available about how the calderas developed and the styles of volcanic eruptions at that time.

One of the biggest calderas, the Nittedal Caldera, contains a sequence of rocks interpreted as deposited within or near the caldera crater. The rocks include mudstones, volcanic tephras, and conglomerates containing a rich variety of volcanic rocks. As this sequence has never been studied in detail, we offer this exiting project in order to learn more about what happened during this critical time period in the development of the Oslo Rift.

Methods include mapping, stratigraphic logging, major and trace element geochemistry, petrography, zircon geochemistry and potentially geochronology.

Published Oct. 8, 2019 9:34 AM - Last modified Oct. 8, 2019 9:34 AM

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