Catastrophic debris avalanche deposit of Socompa volcano, northern Chile

Research Article| September 01, 1985 Catastrophic debris avalanche deposit of Socompa volcano, northern Chile P. W. Francis; P. W. Francis 1Lunar and Planetary Institute, 3303 Nasa Road 1, Houston, Texas 77058 Search for other works by this author on: GSW Google Scholar M. Gardeweg; M. Gardeweg 2Servicio Nacional de Geología y Minería, Casilla 10465, Santiago, Chile Search for other works by this author on: GSW Google Scholar C. F. Ramirez; C. F. Ramirez 2Servicio Nacional de Geología y Minería, Casilla 10465, Santiago, Chile Search for other works by this author on: GSW Google Scholar D. A. Rothery D. A. Rothery 3Department of Earth Sciences, Open University, Milton Keynes MK7 6AA, England Search for other works by this author on: GSW Google Scholar Author and Article Information P. W. Francis 1Lunar and Planetary Institute, 3303 Nasa Road 1, Houston, Texas 77058 M. Gardeweg 2Servicio Nacional de Geología y Minería, Casilla 10465, Santiago, Chile C. F. Ramirez 2Servicio Nacional de Geología y Minería, Casilla 10465, Santiago, Chile D. A. Rothery 3Department of Earth Sciences, Open University, Milton Keynes MK7 6AA, England Publisher: Geological Society of America First Online: 01 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1985) 13 (9): 600–603. https://doi.org/10.1130/0091-7613(1985)13<600:CDADOS>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 Tools Icon Tools Get Permissions Search Site Citation P. W. Francis, M. Gardeweg, C. F. Ramirez, D. A. Rothery; Catastrophic debris avalanche deposit of Socompa volcano, northern Chile. Geology 1985;; 13 (9): 600–603. doi: https://doi.org/10.1130/0091-7613(1985)13<600:CDADOS>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 Between 10 000 and 500 yr ago the Socompa volcano in northern Chile experienced a catastrophic collapse of a 70° sector of the original cone, causing a debris avalanche that descended nearly 3000 m vertically arid traveled more than 35 km from the volcano. The deposits cover some 490 km2 and have a minimum volume of 15 km3. Parts of the original cone slumped in a nearly coherent form and are now preserved as large blocks more than 400 m high. The primary avalanche traveled northwestward over sloping ground before coming to rest transiently, forming a prominent marginal ridge, and then slid away northeastward to form a secondary flow, overriding much of the primary avalanche deposit. Abundant, prismatic, jointed dacite blocks within the debris avalanche deposit and a thin, fine-grained pumiceous deposit beneath it suggest that the collapse was triggered by magmatic activity and may have been accompanied by a violent lateral blast. Collapse was followed by eruption of pumiceous pyroclastic flows and extrusion of voluminous dacite domes. 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.