The role of ductile flow of the lower crust in controlling heat advection in the footwall of the Naxos extensional fault system (Aegean Sea, Greece)

Peillod, AlexandreStockholms universitet,Institutionen för geologiska vetenskaper (author)

Geothermobarometric and structural work indicates that metamorphism in the footwall of the migmatitic Naxos core complex is strongly coupled to heat advection in the lower crust. Using the average pressure-temperature (P-T) method of THERMOCALC for geothermobarometric calculations coupled with detailed textural work, we constructed P-T paths for nine samples that have different spatial relationships to the Naxos extensional fault system and a migmatite dome in the center of the Naxos core complex. All nine samples show early near isothermal decompression. The late, cooling segment of the P-T paths shows systematic spatial differences in temperature gradients relative to the distance of the samples below the Naxos extensional detachment (representing the top of the Naxos extensional fault system). The differences in late thermal gradients correlate with finite strain, a proxy for the intensity of ductile flow. High finite strain correlates with high thermal gradients that do not change with distance below the Naxos detachment, whereas low finite strain correlates with downward decreasing thermal gradients. The difference in late thermal gradients and finite strain define a thermal asymmetry controlled by ductile flow, which we interpret to show that ductile flow controlled advection of heat and thus high-grade metamorphism on Naxos. We conclude that advective heating is an important driver of metamorphism in extensional settings.

Ring, UweStockholms universitet,Institutionen för geologiska vetenskaper(Swepub:su)uring (author)
Skelton, AlasdairStockholms universitet,Institutionen för geologiska vetenskaper(Swepub:su)skelt (author)
Linnros, HenrikStockholms universitet,Institutionen för geologiska vetenskaper (author)
Hansman, Reuben J.Stockholms universitet,Institutionen för geologiska vetenskaper(Swepub:su)hare3882 (author)
Stockholms universitetInstitutionen för geologiska vetenskaper (creator_code:org_t)

By the author/editor: Peillod, Alexand ...; Ring, Uwe; Skelton, Alasdai ...; Linnros, Henrik; Hansman, Reuben ...

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