TY  - JOUR
A1  - Friese, Nadine
A1  - Vollbrecht, Axel
A1  - Leiss, Bernd
A1  - Jacke, Olaf
T1  - Cambrian sedimentary dykes in the Proterozoic basement of the Västervik area (southeast Sweden): episodic formation inferred from macro- and microfabrics
Y1  - 2010
VL  - 100
IS  - 4
SP  - 741
EP  - 752
JF  - International Journal of Earth Sciences
DO  - 10.1007/s00531-009-0508-3
DO  - 10.23689/fidgeo-2641
PB  - Springer-Verlag
N2  - Fabrics of Cambrian sedimentary dykes formed in Proterozoic granites of the Västervik area (Southeast Sweden) evidence repeated opening/filling and mineralisation/cementation events under varying conditions. Diagnostic features include (1) wall-parallel boundaries between epiclastic fillings and (2) early formed dyke sediments that appear as lithoclasts in subsequently formed sedimentary fillings. The psammitic components mostly consist of well-rounded quartz grains related to a coastal environment and fragments from the granitic host rock. Platy calcitic fragments embedded in the epiclastic matrix originally formed as microveins within already-lithified dyke sediments and the adjacent host rock. Convex downward-pointing, internal sagging structures, together with the preferred orientation of compositional boundaries and long axes of grains/rock fragments parallel to the dyke walls, are interpreted as the result of suction-controlled flow of unconsolidated fillings during episodes of downward dyke growth. Pressure solution of quartz grains are evidence of extensional phases with dyke propagation that were interrupted by phases of horizontal compression normal to the dyke walls. The N–S and NE–SW striking sedimentary dykes formed by opening of a pre-existing joint set during NW–SE oriented rifting during the Cambrian.
UR  - http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/6954
ER  -