In:
Geological Magazine, Cambridge University Press (CUP), Vol. 134, No. 5 ( 1997-09), p. 597-606
Abstract:
The Tornquist Fan is a northwestward widening splay of late
Carboniferous–early Permian fault zones in the region of Denmark emanating from the Teisseyre-Tornquist Zone
in northern Poland. The
crust–mantle boundary shows an undulating topography which correlates with the main tectonic features of the area. Zones of high average velocity through the consolidated crust
coincide with pronounced positive
Bouguer gravity anomalies in the deep basins and in the border zone of the
shield. Less pronounced, similar correlation to gravity is found for the thickness of the lower crust, whereas the thickness of the upper crust in
parts is inversely related to the gravity anomalies. Some magnetic anomalies appear to be related to the gravity anomalies. The positive features are interpreted as magmatic bodies that formed during late
Carboniferous to early Permian transtensional movement along the faults of
the Tornquist Fan, which explains pull-apart structures in the area and the Ringkøbing-Fyn basement
High. The magmatism has
strong implications for the subsequent formation of the regional Mesozoic basins. Localized dextral strike-slip movement on the Teisseyre-Tornquist Zone became distributed over the Tornquist Fan, which formed
part of the rigid Baltic Shield and was situated at the northwestern end of
this major, long-reaching Central European zone. As defined by late Cretaceous–early Tertiary
compressional inversion structures, the Sorgenfrei-Tornquist Zone cuts across the Tornquist Fan area.
Type of Medium:
Online Resource
ISSN:
0016-7568
,
1469-5081
DOI:
10.1017/S0016756897007267
Language:
English
Publisher:
Cambridge University Press (CUP)
Publication Date:
1997
detail.hit.zdb_id:
956405-6
detail.hit.zdb_id:
1479206-0
SSG:
13
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