EGU2020-18825, updated on 26 Sep 2021 https://doi.org/10.5194/egusphere-egu2020-18825 EGU General Assembly 2020 © Author(s) 2021. This work is distributed under the Creative Commons Attribution 4.0 License. 3D gravity and magnetic model of the Rogaland Igneous Complex in southwest Norway: a tank for ilmenite, apatite and magnetite resources Zeudia Pastore and Suzanne McEnroe Norwegian University of Science and Technology, Department of Geoscience and Petroleum, Trondheim, Norway (
[email protected]) The Rogaland Igneous Complex (RIC), in southwest Norway, is well known for its iron-titanium ore deposits (i.e. Storgangen and Tellnes), and potential apatite and vanadium-rich magnetite deposits. A better understanding of the subsurface structure of the complex and surrounding anorthosites will help to locate new mineral deposits, and in estimating the extent of the known mineralized zones. The RIC consists of anorthosites, leuconorites, mangerites, and the Bjerkreim- Sokndal (BK) layered intrusion. These igneous rocks were intruded into granulite facies rocks at 0.93-0.92 Ga, during the late-stage of the Sveconorwegian orogeny. There is a strong correlation between the geology of the RIC and the magnetic and gravity anomaly patterns, with contrasting signatures between the three large anorthosite bodies (Egersund-Ogna, Haland-Helleren, and Ana-Sira) and the extensive BK layered intrusion. Particularly, the Bouguer gravity map shows gravity lows over the anorthosites and the granulites, while a positive gravity anomaly ranging from 10 to 30 mGal correlates with the norite and mangerite rocks. In the aeromagnetic anomaly map, the anorthosites correlate with moderate to strong negative magnetic anomalies (below background) while mangerites and granulites have positive anomalies.