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Patterns and Origin of Radial Dike Swarms Associated with West Spanish Peak and Dike Mountain, South-Central Colorado

1961; Geological Society of America; Volume: 72; Issue: 4 Linguagem: Inglês

10.1130/0016-7606(1961)72[579

1943-2674

Ross B. Johnson,

Landslides and related hazards

Research Article| April 01, 1961 Patterns and Origin of Radial Dike Swarms Associated with West Spanish Peak and Dike Mountain, South-Central Colorado ROSS B JOHNSON ROSS B JOHNSON U. S. Geological Survey, Denver, Colo Search for other works by this author on: GSW Google Scholar Author and Article Information ROSS B JOHNSON U. S. Geological Survey, Denver, Colo Publisher: Geological Society of America Received: 19 Oct 1959 First Online: 02 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Copyright © 1961, The Geological Society of America, Inc. Copyright is not claimed on any material prepared by U.S. government employees within the scope of their employment. GSA Bulletin (1961) 72 (4): 579–589. https://doi.org/10.1130/0016-7606(1961)72[579:PAOORD]2.0.CO;2 Article history Received: 19 Oct 1959 First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation ROSS B JOHNSON; Patterns and Origin of Radial Dike Swarms Associated with West Spanish Peak and Dike Mountain, South-Central Colorado. GSA Bulletin 1961;; 72 (4): 579–589. doi: https://doi.org/10.1130/0016-7606(1961)72[579:PAOORD]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 West Spanish Peak and Dike Mountain in south-central Colorado are stocks which cut Tertiary sedimentary rocks near the axis of the La Veta syncline, the structural trough of the Raton basin. Associated with these stocks are radial dike swarms. The outline of the West Spanish Peak dike swarm is elliptical. The Dike Mountain swarm is more radial, and its outline is oval. Both systems are elongated normal to the axis of the La Veta syncline.The dikes of the West Spanish Peak swarm are of diverse rock types and represent several separate magmatic phases. Those of the Dike Mountain swarm are facies of syenodiorite and probably represent a single phase of magmatic invasion.The dikes occupy vertical joints that have been generally attributed to radial fissuring during doming of the sedimentary rocks by the emplacement of the stocks. Structural studies, however, indicate that several systems of shear and tension joints resulted from intermittent orogenic stresses of varying direction and magnitude during folding of the syncline before invasion of the magmas, and the writer suggests that selective intrusion into this joint complex accounts for the dike patterns. This content is PDF only. Please click on the PDF icon to access. 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.