Research Article| August 01, 1977 Coarsening-upward cycles in the alluvium of Hornelen Basin (Devonian) Norway: Sedimentary response to tectonic events R. J. STEEL; R. J. STEEL 1Geological Institute, University of Bergen, 5000 Bergen, Norway Search for other works by this author on: GSW Google Scholar S. NÆHLE; S. NÆHLE 1Geological Institute, University of Bergen, 5000 Bergen, Norway Search for other works by this author on: GSW Google Scholar H. NILSEN; H. NILSEN 1Geological Institute, University of Bergen, 5000 Bergen, Norway Search for other works by this author on: GSW Google Scholar S. L. RØE; S. L. RØE 1Geological Institute, University of Bergen, 5000 Bergen, Norway Search for other works by this author on: GSW Google Scholar A. SPINNANGR A. SPINNANGR 1Geological Institute, University of Bergen, 5000 Bergen, Norway Search for other works by this author on: GSW Google Scholar GSA Bulletin (1977) 88 (8): 1124–1134. https://doi.org/10.1130/0016-7606(1977)88<1124:CCITAO>2.0.CO;2 Article history first online: 01 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation R. J. STEEL, S. NÆHLE, H. NILSEN, S. L. RØE, A. SPINNANGR; Coarsening-upward cycles in the alluvium of Hornelen Basin (Devonian) Norway: Sedimentary response to tectonic events. GSA Bulletin 1977;; 88 (8): 1124–1134. doi: https://doi.org/10.1130/0016-7606(1977)88<1124:CCITAO>2.0.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGSA Bulletin Search Advanced Search Abstract Hornelen Basin (Devonian) is filled with ∼25 km of sediments, mostly sandstones. These sedimentary rocks are spectacularly organized into more than 150 basin-wide cycles, each on the order of 100 m thick, most of which coarsen upward. The cycles are otherwise complex, consisting of marginally derived fanglomerates and laterally equivalent, longitudinally dispersed alluvial plain sediments.The basin-wide nature of the cycles, the fact that the coarsening upward occurred at the same time in both marginal and axial facies, and because successive alluvial fan bodies coarsen upward whether they are composed of debris flow or of stream deposits suggest that the cycles are allocyclic and that they are the basin's response to the lowering of its floor. In their marginal development, the cycles are commonly segmented, consisting of coarsening-upward subcycles of the order of 10 to 25 m thick. The geometry and internal details of these suggest that they also were tectonically generated.It is likely that the 10 to 25-m coarsening-upward sequences, representing aggrading base-level conditions, were the basic sedimentary response to basin-floor subsidence. The 100-m cycles represent additional complexity in style of subsidence. Progressive eastward overlap of successive 100-m units suggests that at this interval the locus of subsidence abruptly shifted in a proximal direction, by ∼0.25 km.A dextral wrench fault model is proposed to account for this pattern of basin filling. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.