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Proterozoic cuspate basement-cover structure, Needle Mountains, Colorado

1987; Geological Society of America; Volume: 15; Issue: 10 Linguagem: Inglês

10.1130/0091-7613(1987)15 2.0.co;2

1943-2682

Charles W. Harris, Richard G. Gibson, Catherine E. Simpson, Kenneth A. Eriksson,

earthquake and tectonic studies

Research Article| October 01, 1987 Proterozoic cuspate basement-cover structure, Needle Mountains, Colorado C. W. Harris; C. W. Harris 1Department of Geological Sciences, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061 Search for other works by this author on: GSW Google Scholar R. G. Gibson; R. G. Gibson 1Department of Geological Sciences, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061 Search for other works by this author on: GSW Google Scholar C. Simpson; C. Simpson 1Department of Geological Sciences, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061 Search for other works by this author on: GSW Google Scholar K. A. Eriksson K. A. Eriksson 1Department of Geological Sciences, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061 Search for other works by this author on: GSW Google Scholar Author and Article Information C. W. Harris 1Department of Geological Sciences, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061 R. G. Gibson 1Department of Geological Sciences, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061 C. Simpson 1Department of Geological Sciences, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061 K. A. Eriksson 1Department of Geological Sciences, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061 Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1987) 15 (10): 950–953. https://doi.org/10.1130/0091-7613(1987)15 2.0.CO;2 Article history First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation C. W. Harris, R. G. Gibson, C. Simpson, K. A. Eriksson; Proterozoic cuspate basement-cover structure, Needle Mountains, Colorado. Geology 1987;; 15 (10): 950–953. doi: https://doi.org/10.1130/0091-7613(1987)15 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 SocietyGeology Search Advanced Search Abstract Deformation zones along basement-cover contacts, which are commonly loci of significant displacement, may also be zones of limited movement when cover and basement are folded together. Proterozoic basement gneisses and siliciclastic cover rocks of the Uncompahgre Group in the Needle Mountains, Colorado, are in contact along steeply dipping deformation zones. Analysis of structures in the basement and cover, and along their contacts, provides evidence for (1) deformation of the basement prior to deposition of the Uncompahgre Group, (2) north-directed, thin-skinned thrusting, and (3) cuspate infolding of cover into basement accompanied by upward and outward movement of the cover. Opposed senses of movement along basement-cover contacts on opposite limbs of the synclinorium generated during cuspate infolding imply that the Uncompahgre Group is parautochthonous on basement. Conjugate strike-slip shear zones in both units accommodated north-northwest shortening. Deformation of basement and cover into cuspate structures may explain the presence of some cover sequences as isolated remnants within gneissic basement. 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.