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Eruptive history of Earth's largest Quaternary caldera (Toba, Indonesia) clarified

1991; Geological Society of America; Volume: 19; Issue: 3 Linguagem: Inglês

10.1130/0091-7613(1991)019 2.3.co;2

1943-2682

Craig A. Chesner, William I. Rose, Alan L. Deino, Robert E. Drake, John A. Westgate,

Geological and Geophysical Studies

Research Article| March 01, 1991 Eruptive history of Earth's largest Quaternary caldera (Toba, Indonesia) clarified C. A. Chesner; C. A. Chesner 1Department of Geology and Geography, Eastern Illinois University, Charleston, Illinois 61920 Search for other works by this author on: GSW Google Scholar W. I. Rose; W. I. Rose 2Department of Geological Engineering, Geology, and Geophysics, Michigan Technological University, Houghton, Michigan 49931 Search for other works by this author on: GSW Google Scholar A. Deino; A. Deino 3Berkeley Geochronology Center, Institute of Human Origins, 2453 Ridge Road, Berkeley, California 94709 Search for other works by this author on: GSW Google Scholar R. Drake; R. Drake 3Berkeley Geochronology Center, Institute of Human Origins, 2453 Ridge Road, Berkeley, California 94709 Search for other works by this author on: GSW Google Scholar J. A. Westgate J. A. Westgate 4Department of Geology, University of Toronto, Scarborough Campus, Scarborough, Ontario M1 C 1A4, Canada Search for other works by this author on: GSW Google Scholar Author and Article Information C. A. Chesner 1Department of Geology and Geography, Eastern Illinois University, Charleston, Illinois 61920 W. I. Rose 2Department of Geological Engineering, Geology, and Geophysics, Michigan Technological University, Houghton, Michigan 49931 A. Deino 3Berkeley Geochronology Center, Institute of Human Origins, 2453 Ridge Road, Berkeley, California 94709 R. Drake 3Berkeley Geochronology Center, Institute of Human Origins, 2453 Ridge Road, Berkeley, California 94709 J. A. Westgate 4Department of Geology, University of Toronto, Scarborough Campus, Scarborough, Ontario M1 C 1A4, Canada Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1991) 19 (3): 200–203. https://doi.org/10.1130/0091-7613(1991)019 2.3.CO;2 Article history First Online: 02 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 C. A. Chesner, W. I. Rose, A. Deino, R. Drake, J. A. Westgate; Eruptive history of Earth's largest Quaternary caldera (Toba, Indonesia) clarified. Geology 1991;; 19 (3): 200–203. doi: https://doi.org/10.1130/0091-7613(1991)019 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 SocietyGeology Search Advanced Search Abstract Single-grain laser-fusion 40Ar/39Ar analyses of individual sanidine phenocrysts from the two youngest Toba (Indonesia) tuffs yield mean ages of 73 ±4 and 501 ±5 ka. In addition, glass shards from Toba ash deposited in Malaysia were dated at 68 ±7 ka by the isothermal plateau fission-track technique. These new determinations, in conjunction with previous ages for the two oldest tuffs at Toba, establish the chronology of four eruptive events from the Toba caldera complex over the past 1.2 m.y. Ash-flow tuffs were erupted from the complex every 0.34 to 0.43 m.y., culminating with the enormous (2500-3000 km3) Youngest Toba tuff eruption, caldera formation, and subsequent resurgence of Samosir Island. Timing of this last eruption at Toba is coincident with the early Wisconsin glacial advance. The high-precision 40Ar/39Ar age for an eruption of such magnitude may provide an important marker horizon useful as a baseline for research and modeling of the worldwide climatic impact of exception-ally large explosive eruptions. 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.