Significance of agglutinate mounds on lava flows associated with monogenetic cones: An example at Sunset Crater, northern Arizona

Research Article| September 01, 1987 Significance of agglutinate mounds on lava flows associated with monogenetic cones: An example at Sunset Crater, northern Arizona RICHARD F. HOLM RICHARD F. HOLM 1Geology Department, Northern Arizona University, Flagstaff, Arizona 86011 Search for other works by this author on: GSW Google Scholar GSA Bulletin (1987) 99 (3): 319–324. https://doi.org/10.1130/0016-7606(1987)99<319:SOAMOL>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 RICHARD F. HOLM; Significance of agglutinate mounds on lava flows associated with monogenetic cones: An example at Sunset Crater, northern Arizona. GSA Bulletin 1987;; 99 (3): 319–324. doi: https://doi.org/10.1130/0016-7606(1987)99<319:SOAMOL>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 Large mounds of welded pyroclasts and rootless flows on top of mafic lava flows associated with symmetrical scoria cones may be evidence for breaching and subsequent restoration of the cones. Textures and bedding structures of the agglutinate mounds are distinctly different from those of hornitos and indicate deposition proximal to a major explosive vent. Breaching of a cone armored by an agglutinate carapace may cause the welded deposits to collapse onto the emerging lava, which then rafts them away. Renewed or continued Strombolian eruptions from the vent can restore the symmetry of the cone and conceal the disrupted structure. Rafted agglutinate mounds on the Bonito lava flow at Sunset Crater, a symmetrical Holocene scoria cone in northern Arizona, extend in a belt from near the base of the cone toward the northwest, the direction the lava flowed. Eye-witness accounts of the eruption at Paricutín, Mexico, in 1943 record breaching and restoration events similar to the one inferred to have occurred at Sunset Crater and demonstrate that symmetrical monogenetic cones may have complicated histories. 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.