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Tilting of Urad-Henderson and Climax porphyry molybdenum systems, central Colorado, as related to northern Rio Grande rift tectonics

1988; Geological Society of America; Volume: 100; Issue: 11 Linguagem: Inglês

10.1130/0016-7606(1988)100 2.3.co;2

1943-2674

E.P. Geraghty, R. B. Carten, Bruce M. Walker,

earthquake and tectonic studies

Research Article| November 01, 1988 Tilting of Urad-Henderson and Climax porphyry molybdenum systems, central Colorado, as related to northern Rio Grande rift tectonics ENNIS P. GERAGHTY; ENNIS P. GERAGHTY 1Climax Molybdenum Company, AMAX, Inc., Henderson Mine, P.O. Box 68, Empire, Colorado 80438 Search for other works by this author on: GSW Google Scholar RICHARD B. CARTEN; RICHARD B. CARTEN 1Climax Molybdenum Company, AMAX, Inc., Henderson Mine, P.O. Box 68, Empire, Colorado 80438 Search for other works by this author on: GSW Google Scholar BRUCE M. WALKER BRUCE M. WALKER 1Climax Molybdenum Company, AMAX, Inc., Henderson Mine, P.O. Box 68, Empire, Colorado 80438 Search for other works by this author on: GSW Google Scholar Author and Article Information ENNIS P. GERAGHTY 1Climax Molybdenum Company, AMAX, Inc., Henderson Mine, P.O. Box 68, Empire, Colorado 80438 RICHARD B. CARTEN 1Climax Molybdenum Company, AMAX, Inc., Henderson Mine, P.O. Box 68, Empire, Colorado 80438 BRUCE M. WALKER 1Climax Molybdenum Company, AMAX, Inc., Henderson Mine, P.O. Box 68, Empire, Colorado 80438 Publisher: Geological Society of America First Online: 01 Jun 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (1988) 100 (11): 1780–1786. https://doi.org/10.1130/0016-7606(1988)100 2.3.CO;2 Article history First Online: 01 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Tools Icon Tools Get Permissions Search Site Citation ENNIS P. GERAGHTY, RICHARD B. CARTEN, BRUCE M. WALKER; Tilting of Urad-Henderson and Climax porphyry molybdenum systems, central Colorado, as related to northern Rio Grande rift tectonics. GSA Bulletin 1988;; 100 (11): 1780–1786. doi: https://doi.org/10.1130/0016-7606(1988)100 2.3.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 Asymmetric orientation of stocks, radial dikes and veins, and attendant molybdenite mineralization and hydrothermal alteration indicates that Oligocene Urad-Henderson (Red Mountain) and Climax intrusive-hydro-thermal systems were tilted approximately 25° southeast and 30° west-southwest, respectively. Field and age relationships suggest that tilting resulted from displacement on normal faults associated with the northern Rio Grande rift. Minimal amounts of extension in central Colorado argue for listric configuration for these normal faults below the level of observation. Both intrusive systems formed during incipient rift development and are associated with early and scarce lamprophyre (kersantite) dikes and with later and numerous high-silica rhyolite stocks and dikes. Magmatic activity was initiated slightly earlier at Climax (33 Ma) than at Red Mountain (29 Ma).Post-ore tilting of Red Mountain was controlled by a set of subparallel, north-northeast- to northeast-trending normal faults with west side down. At Climax, deformation was more complex, with a reversal in tilt direction. The resultant tilt of Climax deposit cannot be associated simply with one set of faults.Reconstruction of Oligocene paleotopography near Red Mountain suggests a minimum depth of emplacement of 1.6 km (41 MPa confining pressure) for the apices of principal mineralizing stocks in the Urad deposit and of 2.8-3.1 km (72-80 MPa) in the Henderson deposit. Depths of emplacement for Climax system are similar to those of Urad-Henderson, 2.3-3.2 km. Exploration for buried Climax-type molybdenite deposits should allow for the probability of tilted ore systems. 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.