Crustal structure and tectonic evolution of the Tornquist Fan region as revealed by geophysical methods

Bulletin of the Geological Society of Denmark

Hager, H.¹  Nickel, E.¹  Laga, P.¹  van Leeuwen, R. J. W.:¹  Vandenberghe, N.¹  van den Bosch, M.¹  Rescher, K.¹  Leroi, S.¹  Verstraelen, A.¹  Abraham, M,. von der Hocht, F.¹ 

[1] The geometry of the Rupelian and Chattian depositional bodies in the Lower Rhine district and its border area: implications for Oligocene lithostratigraphy. Bulletin of the Geological Society of Denmark, Vol. 45, pp. 53–62. Copenhagen, 1998–09–25.

关键词: Rupelian;    Chattian;    stratigraphy;    eustacy;    tectonics.;   

学科分类：地球科学(综合)

来源: Dansk Geologisk Forening

【 摘 要 】

Crustal structure derived primarily from geophysical investigations reveals features that may be related to the complex tectonic evolution of the Tornquist Fan region. This northwestwards widening splay of Late Carboniferous – Early Permian fault zones in the Danish region emanates from the Teisseyre-Tornquist Zone in northern Poland. Seismic reflections and velocity anomalies image collisional fault zones that formed during the Proterozoic and Palaeozoic amalgamation of the crust. Re-equilibration of Moho appears to have taken place before late Palaeozoic rifting and magmatism initiated the main phase of basin formation that continued into the Mesozoic. The resulting, strong Moho topography, with variation between depths of 26 and 48 km, has been practically “frozen in” since then, although the late Cretaceous – early Cenozoic inversion tectonics may have formed a crustal keel underneath part of the Sorgenfrei-Tornquist Zone which cuts across the Proterozoic crust of the Tornquist Fan region.

【 授权许可】

Unknown