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Tertiary volcanism and caldera development near Durango City, Sierra Madre Occidental, Mexico

1978; Geological Society of America; Volume: 89; Issue: 7 Linguagem: Inglês

10.1130/0016-7606(1978)89 2.0.co;2

1943-2674

Eric R. Swanson, RICHARD P. KEIZER, James I. Lyons, S. E. Clabaugh,

Geology and Paleoclimatology Research

Research Article| July 01, 1978 Tertiary volcanism and caldera development near Durango City, Sierra Madre Occidental, Mexico ERIC R. SWANSON; ERIC R. SWANSON 1Department of Geological Sciences, The University of Texas at Austin, Austin, Texas 787123Present address: Geology Department, Wayne State University, Detroit, Michigan 48202 Search for other works by this author on: GSW Google Scholar RICHARD P. KEIZER; RICHARD P. KEIZER 1Department of Geological Sciences, The University of Texas at Austin, Austin, Texas 78712 Search for other works by this author on: GSW Google Scholar JAMES I. LYONS; JAMES I. LYONS 2Bear Creek Mining Company, Tucson, Arizona 85702 Search for other works by this author on: GSW Google Scholar S. E. CLABAUGH S. E. CLABAUGH 1Department of Geological Sciences, The University of Texas at Austin, Austin, Texas 78712 Search for other works by this author on: GSW Google Scholar Author and Article Information ERIC R. SWANSON 1Department of Geological Sciences, The University of Texas at Austin, Austin, Texas 787123Present address: Geology Department, Wayne State University, Detroit, Michigan 48202 RICHARD P. KEIZER 1Department of Geological Sciences, The University of Texas at Austin, Austin, Texas 78712 JAMES I. LYONS 2Bear Creek Mining Company, Tucson, Arizona 85702 S. E. CLABAUGH 1Department of Geological Sciences, The University of Texas at Austin, Austin, Texas 78712 Publisher: Geological Society of America First Online: 01 Jun 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (1978) 89 (7): 1000–1012. https://doi.org/10.1130/0016-7606(1978)89 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 Email Permissions Search Site Citation ERIC R. SWANSON, RICHARD P. KEIZER, JAMES I. LYONS, S. E. CLABAUGH; Tertiary volcanism and caldera development near Durango City, Sierra Madre Occidental, Mexico. GSA Bulletin 1978;; 89 (7): 1000–1012. doi: https://doi.org/10.1130/0016-7606(1978)89 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 Near Durango City, older andesites are overlain by approximately 800 m of rhyolitic volcanic rock, mostly ash-flow tuff of Oligocene age. The rhyolite is unconformably overlain by a few tens of meters of late Miocene basalt in the highlands west of Durango City and by Quaternary basalt and gravel in the Guadiana Valley.By 32 m.y. ago, voluminous rhyolitic ash-flow tuff was being emplaced over a rugged topography developed on the older andesites. Shortly thereafter, sources in the Durango City area became active and produced two major ash-flow sheets. These ash-flow sheets, together with caldera-fill material, constitute the Carpintero Group. Subsidence in their source areas initiated development of the Chupaderos caldera complex. Most ash-flow sheets overlying the Carpintero Group originated from distant sources, but later eruptions from the caldera area produced one major post-Carpintero ash-flow unit with associated collapse of a distinctive inner caldera.Rhyolitic volcanism ceased in the Durango area by 28 m.y. ago, but continued until 23 m.y. farther west. Chemical analyses of volcanic rocks from a strip mapped in detail across the Sierra Madre Occidental show systematic variations. Silicic volcanic rocks to the east are higher in silicon and potassium and lower in sodium, aluminum, and calcium than rocks to the west. The phenocryst mineralogy of volcanic rocks along the strip reflects these chemical variations.Mafic rocks of the Durango area were erupted in three distinct episodes. A small amount of subalkaline basalt is interlayered with the Durango volcanic sequence. Later, alkaline lavas of the Metates Formation were erupted during an episode of late Miocene normal faulting. The large basalt field in the Guadiana Valley is inter-layered with Quaternary gravel, and the youngest flows are Holocene. 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.