publication . Article . 2001

crustal structure of the northern baltic sea palaeorift

Annakaisa Korja; Heikkinen, P.; Aaro, S.;
  • Published: 01 Jan 2001 Journal: Tectonophysics, volume 331, pages 341-358 (issn: 0040-1951, Copyright policy)
  • Publisher: Elsevier BV
Abstract Integrated analysis of the gravity data measured in the northern Baltic Sea in 1997 and the near-vertical BABEL data shot in 1989 provides important constraints for the Subjotnian (1600–1500) rift-related evolution of the Svecofennian orogenic crust. The Subjotnian is characterised by voluminous bimodal rapakivi granite magmatism that is manifested as large granite batholiths associated with ovoid crustal thickness minima and large Bouguer gravity minima (−20 to −40 mgal). In the seismic sections, the batholiths are transparent whereas the lower crust beneath is highly reflective and bears signs of intra- and underplating. The Bouguer anomaly map togeth...
free text keywords: Earth-Surface Processes, Geophysics, Geomorphology, Crust, Batholith, Mafic, Rift, Pluton, Bouguer anomaly, Geology, Jotnian, Underplating
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