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International Journal of Earth Sciences

, Volume 104, Issue 2, pp 323–333 | Cite as

Geometry of laccolith margins: 2D and 3D models of the Late Paleozoic Halle Volcanic Complex (Germany)

  • T. SchmiedelEmail author
  • C. Breitkreuz
  • I. Görz
  • B.-C. Ehling
Original Paper

Abstract

Well data and core samples from the Late Paleozoic Halle Volcanic Complex (HVC) have been used to describe the geometry of the rhyolitic porphyritic laccoliths and their margins. The HVC formed between 301 and 292 Ma in the intramontane Saale basin, and it comprises mainly rhyolitic subvolcanic bodies (~300 km3) as well as minor lava flows and volcaniclastic deposits. The major HVC laccolith units display aspect ratios ranging between 0.04 and 0.07, and they are separated by tilted and deformed Carboniferous–Permian host sediments. For the margin of the Landsberg laccolith, a major coarsely porphyritic unit of the HVC, an exceptional data set of 63 wells concentrated in an area of 10 km2 reaching to depth of 710 m exists. It was used to explore the 3D geometry and textures, and to deduce an intrusion model. For a 3D visualization of the Landsberg laccolith margin, Geological Object Computer Aided Design; Paradigm® software (GOCAD) was used. Curve objects have been derived from the intrusion–host contacts. Automated GOCAD® methods for 3D modelling failed. As a result, manual refinement was essential. A major finding of the 3D modelling is the presence of prolate sediment rafts, up to 1,400 m in length and up to 500 m in thickness, surrounded by Landsberg rhyolite. The sedimentary rafts dip away from the laccolith centre. The engulfing laccolith sheets reach thickness of 100–300 m. For other HVC laccolith units (Löbejün, Petersberg, Brachstedt), well data reveal vertical rhyolite/sediment contacts or magma lobes fingering into the host sediments. HVC laccolith contact textures include small-scale shearing of the intruding magma and of the host sediment. In addition, internal shear zones have been detected inside the rhyolite bodies. The present study suggests that the emplacement of successive magma sheets was an important process during laccolith growth in the HVC.

Keywords

GOCAD© Well data Magma sheet emplacement Porphyritic rhyolite 

Notes

Acknowledgments

We thank the WISMUT GmbH for permitting access to and sampling of wells. We are also grateful to Jan Bergemann who helped creating the movie (ESM Appendix).

Supplementary material

Supplementary material 1 (AVI 18265 kb)

531_2014_1085_MOESM2_ESM.pdf (738 kb)
Supplementary material 2 (PDF 738 kb)
531_2014_1085_MOESM3_ESM.pdf (444 kb)
Supplementary material 3 (PDF 443 kb)
531_2014_1085_MOESM4_ESM.pdf (382 kb)
Supplementary material 4 (PDF 382 kb)

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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • T. Schmiedel
    • 1
    Email author
  • C. Breitkreuz
    • 1
  • I. Görz
    • 2
  • B.-C. Ehling
    • 3
  1. 1.Geology DepartmentTU Bergakademie FreibergFreibergGermany
  2. 2.Geophysics and Geoinformatics DepartmentTU Bergakademie FreibergFreibergGermany
  3. 3.Sachsen-Anhalt State Survey for Geology and MiningHalleGermany

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