Core-drilling at the Engebøfjell rutile-bearing eclogite 1995-96. Summary report

Engebøfjellet is situated on the northern side of Førdefjord within an area characterized by a series of Proterozoic felsic and mafic rocks heavily affected by Caledonian deformation and metamorphism. During the Caledonian high-pressure metamorphism Proterozoic mafic rocks were transformed into eclogites. In this transformation ilmenite was replaced by rutile. The protolith to the Engebøfjell eclogite is believed to be a layered, Ti-rich, Proterozoic gabbroic complex; it now has the form of a highly irregular, east- west trending, 2.5 km long and up to 0.5 km broad lens dipping steeply to the north. It consists of two major eclogite varieties; a leucogabbroic eclogite with low Ti-and Fe-content, and a ferrogabbroic, Ti-and Fe-rich eclogite. This ferrogabbroic eclogite is the rutile ore that has been the focus of the rutile exploration work at Engebøfjellet. In the period October 1995 to June 1996 ten reconnaissance bore-holes were drilled to investigate the character of the Engebøfjell ferrogabbroic eclogite at depth; altogether 2340 meters of core were recovered. This report gives a summary of these drilling results with analytical data and mineralogical descriptions.

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