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Volume 32 Issue 6
Dec 2021
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Tom Andersen, O. Tapani Rämö. Dehydration Melting and Proterozoic Granite Petrogenesis in a Collisional Orogen—A Case from the Svecofennian of Southern Finland. Journal of Earth Science, 2021, 32(6): 1289-1299. doi: 10.1007/s12583-020-1385-8
Citation: Tom Andersen, O. Tapani Rämö. Dehydration Melting and Proterozoic Granite Petrogenesis in a Collisional Orogen—A Case from the Svecofennian of Southern Finland. Journal of Earth Science, 2021, 32(6): 1289-1299. doi: 10.1007/s12583-020-1385-8

Dehydration Melting and Proterozoic Granite Petrogenesis in a Collisional Orogen—A Case from the Svecofennian of Southern Finland

doi: 10.1007/s12583-020-1385-8
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  • Corresponding author: O. Tapani Rämö, tapani.ramo@helsinki.fi
  • Received Date: 07 Sep 2020
  • Accepted Date: 01 Dec 2020
  • Publish Date: 30 Dec 2021
  • Dehydration melting of metasupracrustal rocks at mid-to deep-crustal levels can generate water undersaturated granitic melt. In this study, we evaluate the potential of ~1.89-1.88 Ga metasupracrustal rocks of the Precambrian of southern Finland as source rocks for the 1.86-1.79 Ga late-orogenic leucogranites in the region, using the Rhyolite-MELTS approach. Melt close in composition to leucogranite is produced over a range of realistic pressures (5 to 8 kbar) and temperatures (800 to 850℃), at 20%-30% of partial melting, allowing separation of melt from unmelted residue. The solid residue is a dry, enderbitic to charnoenderbitic ganulite depleted in incompatible components, and will only yield further melt above 1 000-1 050℃, when rapidly increasing fractions of increasingly calcic (granodioritic to tonalitic) melts are formed. The solid residue after melt extraction is incapable of producing syenogranitic magmas similar to the Mid-Proterozoic, A-type rapakivi granites on further heating. The granitic fraction of the syenogranitic rapakivi complexes must thus have been formed by a different chain of processes, involving mantle-derived mafic melts and melts from crustal rock types not conditioned by the preceding late-orogenic Svecofennian anatexis.

     

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