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

Tom Andersen; O. Tapani Rämö

doi:10.1007/s12583-020-1385-8

Volume 32 Issue 6

Dec 2021

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Journal of Earth Science > 2021 > 32(6): 1289-1299.

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

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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

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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

Tom Andersen¹,
O. Tapani Rämö^{2
,
,}

1.
Department of Geosciences, University of Oslo, N-0316 Oslo, Norway
2.
Department of Geosciences and Geography, Geology and Geophysics Research Program, University of Helsinki, 00014 Helsinki, Finland

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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

Abstract

Abstract

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.
- leucogranite,
- rapakivi granite,
- anatexis,
- restite,
- depleted granulite,
- Finland

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References(59)

References

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

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

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