Open AccessCrustal reflections underneath Lake Vänern, Sweden
Author(s) -
Juhlin C.,
Dyrelius D.,
Lund C.E.,
Palm H.
Publication year - 1989
Publication title -
geophysical journal international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.302
H-Index - 168
eISSN - 1365-246X
pISSN - 0956-540X
DOI - 10.1111/j.1365-246x.1989.tb02041.x
Subject(s) - geology , mylonite , crust , seismology , peninsula , context (archaeology) , overprinting , orogeny , mafic , geophysics , petrology , paleontology , tectonics , shear zone , history , archaeology
SUMMARY In conjunction with airgun profiles on Lake Vänern, 48‐channel seismic recordings were made along a 7 km long profile on the northern peninsula, Värmlandsnäs. This peninsula lies in the Mylonite Zone which runs through SW Sweden. Four airgun profiles were recorded, two on the eastern side of the Mylonite Zone and two on the western side, each profile being on the order of 20‐30 km long. These profiles have been processed using the method of common data point (CDP) stacking which resulted in a total of approximately 50 km of sub‐surface coverage. We have interpreted the data in the context of the regional geology and results from other geophysical studies in the area. Important results are the imaging of lower crustal reflectors and Moho at near‐vertical incidence angles. The dips and depths of these reflectors are in fair agreement with other studies. The upper crust on the eastern side of the Mylonite Zone appears to be considerably more reflective. This may be due to the presence of mafic intrusions or to the reworking of the crust during the Sveconorwegian orogeny. A brief comparison with results from the GLIMPCE profiles over the Grenville province is also made.