Kerrosintruusioiden sivukivien osittainen sulaminen : Suomen Akatemian rahoittama viisivuotinen projekti käyntiin Helsingin yliopistolla

• Main Author: Heinonen, Jussi S.
• Other Authors: Geotieteiden ja maantieteen osasto
• Format: Article in Journal/Newspaper
• Language: Finnish
• Published: Suomen Geologinen Seura 2020
• Subjects: Geotieteet; Muren; Utpostane; Antarc*; Antarctica; Fennoscandian
• Online Access: http://hdl.handle.net/10138/313852

Magma-wallrock interaction in crustal magma chambers (a process known as crustal assimilation) is critical to the evolution of a magmatic system and the formation of many economically important base and precious metal deposits. Although the generalized crustal assimilation model is largely accepted, the details of the interactions remain relatively poorly characterized. One of the major issues has been the lack of models that integrate mass and energy exchange, thermodynamics and geochemistry. The project titled “Partial melting processes at the contact zones of layered intrusions” proposes to explore magma-wallrock interaction at three major intrusive complexes in Antarctica (Muren and Utpostane, 180 Ma), USA (Duluth, 1100 Ma), and Finland (Fennoscandian LIP, 2440 Ma). The study is a multidisciplinary effort which will include state-of-the-art computational modeling with recently developed energy-constrained equations. The modeling will be tested against existing and new geochemical data, as well as partial melting experiments of wallrock. The results are expected to provide unique insight into the generation of layered intrusions and associated ore deposits. The project is conducted at the University of Helsinki in collaboration with the Geological Survey of Finland, University of California Santa Barbara, Central Washington University, and Swiss Federal Institute of Techonology Zürich. The project is funded by the Academy of Finland from September 2016 to August 2021. Proposals for potential collaboration (e.g. additional case studies) are very welcome!