caa a22 4500 60615017X CHVBK 20210128100537.0 cr unu---uuuuu 210128e20150301xx s 000 0 eng 10.1007/s00531-014-1085-7 doi (NATIONALLICENCE)springer-10.1007/s00531-014-1085-7 Geometry of laccolith margins: 2D and 3D models of the Late Paleozoic Halle Volcanic Complex (Germany) [Elektronische Daten] [T. Schmiedel, C. Breitkreuz, I. Görz, B.-C. Ehling] 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 292Ma in the intramontane Saale basin, and it comprises mainly rhyolitic subvolcanic bodies (~300km3) 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 10km2 reaching to depth of 710m 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 1,400m in length and up to 500m in thickness, surrounded by Landsberg rhyolite. The sedimentary rafts dip away from the laccolith centre. The engulfing laccolith sheets reach thickness of 100-300m. 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. Springer-Verlag Berlin Heidelberg, 2014 GOCAD© nationallicence Well data nationallicence Magma sheet emplacement nationallicence Porphyritic rhyolite nationallicence Schmiedel T. Geology Department, TU Bergakademie Freiberg, Freiberg, Germany aut Breitkreuz C. Geology Department, TU Bergakademie Freiberg, Freiberg, Germany aut Görz I. Geophysics and Geoinformatics Department, TU Bergakademie Freiberg, Freiberg, Germany aut Ehling B.-C Sachsen-Anhalt State Survey for Geology and Mining, Halle, Germany aut International Journal of Earth Sciences Springer Berlin Heidelberg 104/2(2015-03-01), 323-333 1437-3254 104:2<323 2015 104 531 https://doi.org/10.1007/s00531-014-1085-7 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00531-014-1085-7 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Schmiedel T. Geology Department, TU Bergakademie Freiberg, Freiberg, Germany aut NATIONALLICENCE 700 1- Breitkreuz C. Geology Department, TU Bergakademie Freiberg, Freiberg, Germany aut NATIONALLICENCE 700 1- Görz I. Geophysics and Geoinformatics Department, TU Bergakademie Freiberg, Freiberg, Germany aut NATIONALLICENCE 700 1- Ehling B.-C Sachsen-Anhalt State Survey for Geology and Mining, Halle, Germany aut NATIONALLICENCE 773 0- International Journal of Earth Sciences Springer Berlin Heidelberg 104/2(2015-03-01), 323-333 1437-3254 104:2<323 2015 104 531