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Using titanomagnetite textures to elucidate volcanic eruption histories

2007; Geological Society of America; Volume: 36; Issue: 1 Linguagem: Inglês

10.1130/g24186a.1

1943-2682

Michael Turner, Shane J. Cronin, Robert B. Stewart, Mark Bebbington, Ian E.M. Smith,

Geological and Geochemical Analysis

Research Article| January 01, 2008 Using titanomagnetite textures to elucidate volcanic eruption histories Michael B. Turner; Michael B. Turner 1Volcanic Risk Solutions, Institute of Natural Resources, Massey University, Private Bag 11222, Palmerston North 4442, New Zealand Search for other works by this author on: GSW Google Scholar Shane J. Cronin; Shane J. Cronin 1Volcanic Risk Solutions, Institute of Natural Resources, Massey University, Private Bag 11222, Palmerston North 4442, New Zealand Search for other works by this author on: GSW Google Scholar Robert B. Stewart; Robert B. Stewart 1Volcanic Risk Solutions, Institute of Natural Resources, Massey University, Private Bag 11222, Palmerston North 4442, New Zealand Search for other works by this author on: GSW Google Scholar Mark Bebbington; Mark Bebbington 2Institute of Information Science and Technology, Massey University, Private Bag 11222, Palmerston North 4442, New Zealand Search for other works by this author on: GSW Google Scholar Ian E.M. Smith Ian E.M. Smith 3School of Geography, Geology, and Environmental Sciences, University of Auckland, Private Bag 92019, Auckland 1142, New Zealand Search for other works by this author on: GSW Google Scholar Author and Article Information Michael B. Turner 1Volcanic Risk Solutions, Institute of Natural Resources, Massey University, Private Bag 11222, Palmerston North 4442, New Zealand Shane J. Cronin 1Volcanic Risk Solutions, Institute of Natural Resources, Massey University, Private Bag 11222, Palmerston North 4442, New Zealand Robert B. Stewart 1Volcanic Risk Solutions, Institute of Natural Resources, Massey University, Private Bag 11222, Palmerston North 4442, New Zealand Mark Bebbington 2Institute of Information Science and Technology, Massey University, Private Bag 11222, Palmerston North 4442, New Zealand Ian E.M. Smith 3School of Geography, Geology, and Environmental Sciences, University of Auckland, Private Bag 92019, Auckland 1142, New Zealand Publisher: Geological Society of America Received: 18 Jun 2007 Revision Received: 22 Aug 2007 Accepted: 25 Aug 2007 First Online: 09 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 The Geological Society of America, Inc. Geology (2008) 36 (1): 31–34. https://doi.org/10.1130/G24186A.1 Article history Received: 18 Jun 2007 Revision Received: 22 Aug 2007 Accepted: 25 Aug 2007 First Online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Michael B. Turner, Shane J. Cronin, Robert B. Stewart, Mark Bebbington, Ian E.M. Smith; Using titanomagnetite textures to elucidate volcanic eruption histories. Geology 2008;; 36 (1): 31–34. doi: https://doi.org/10.1130/G24186A.1 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 Mineral assemblages in volcanic rocks record both pre-eruptive conditions and changes experienced by magma as it rises. Titanomagnetite in andesitic magmas is especially sensitive to changes in temperature and oxygen fugacity immediately prior to and during eruptions. Two end-member eruption states can be distinguished by examining titanomagnetite textures in erupted rocks. Slow-ascent eruptions—characterized by near-stagnant magma bodies and slow effusion of lava domes—show solid-state exsolution of titanohematite/ilmenite lamellae within titanomagnetite hosts. By contrast, fast-ascent eruptions—characterized by rapid chilling of magma in sub-Plinian eruptions—contain titanomagnetites without such exsolution features. This mineralogical distinction is particularly useful in examining very fine-grained distal tephra layers where other characteristic properties of the two eruptions types are not present. Such tephra records in lake deposits typically provide the most precise long-term eruption records from andesitic volcanoes. Using an example from Mount Taranaki, New Zealand, we show that by classifying eruption styles within such sequences, the underlying magmatic system processes at a volcano can be elucidated and separated from other environmental factors such as vent/crater configuration. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.