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• W2308478180 abstract "Research Article| July 01, 2016 Long-lived shield volcanism within a monogenetic basaltic field: The conundrum of Rangitoto volcano, New Zealand Tamzin Linnell; Tamzin Linnell 1School of Environment, University of Auckland, Private Bag 92019, Auckland, New Zealand Search for other works by this author on: GSW Google Scholar Phil Shane; Phil Shane † 1School of Environment, University of Auckland, Private Bag 92019, Auckland, New Zealand †Corresponding author: pa.shane@auckland.ac.nz. Search for other works by this author on: GSW Google Scholar Ian Smith; Ian Smith 1School of Environment, University of Auckland, Private Bag 92019, Auckland, New Zealand Search for other works by this author on: GSW Google Scholar Paul Augustinus; Paul Augustinus 1School of Environment, University of Auckland, Private Bag 92019, Auckland, New Zealand Search for other works by this author on: GSW Google Scholar Shane Cronin; Shane Cronin 1School of Environment, University of Auckland, Private Bag 92019, Auckland, New Zealand Search for other works by this author on: GSW Google Scholar Jan Lindsay; Jan Lindsay 1School of Environment, University of Auckland, Private Bag 92019, Auckland, New Zealand Search for other works by this author on: GSW Google Scholar Roland Maas Roland Maas 2School of Earth Sciences, University of Melbourne, Melbourne, Victoria 3010, Australia Search for other works by this author on: GSW Google Scholar Author and Article Information Tamzin Linnell 1School of Environment, University of Auckland, Private Bag 92019, Auckland, New Zealand Phil Shane † 1School of Environment, University of Auckland, Private Bag 92019, Auckland, New Zealand Ian Smith 1School of Environment, University of Auckland, Private Bag 92019, Auckland, New Zealand Paul Augustinus 1School of Environment, University of Auckland, Private Bag 92019, Auckland, New Zealand Shane Cronin 1School of Environment, University of Auckland, Private Bag 92019, Auckland, New Zealand Jan Lindsay 1School of Environment, University of Auckland, Private Bag 92019, Auckland, New Zealand Roland Maas 2School of Earth Sciences, University of Melbourne, Melbourne, Victoria 3010, Australia †Corresponding author: pa.shane@auckland.ac.nz. Publisher: Geological Society of America Received: 27 Jul 2015 Revision Received: 06 Dec 2015 Accepted: 16 Feb 2016 First Online: 02 Jun 2017 Online Issn: 1943-2674 Print Issn: 0016-7606 © 2016 Geological Society of America GSA Bulletin (2016) 128 (7-8): 1160–1172. https://doi.org/10.1130/B31392.1 Article history Received: 27 Jul 2015 Revision Received: 06 Dec 2015 Accepted: 16 Feb 2016 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 Tamzin Linnell, Phil Shane, Ian Smith, Paul Augustinus, Shane Cronin, Jan Lindsay, Roland Maas; Long-lived shield volcanism within a monogenetic basaltic field: The conundrum of Rangitoto volcano, New Zealand. GSA Bulletin 2016;; 128 (7-8): 1160–1172. doi: https://doi.org/10.1130/B31392.1 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 SocietyGSA Bulletin Search Advanced Search Abstract Drilling through the edifice of Rangitoto, the youngest and largest volcano in the “monogenetic” Auckland volcanic field, reveals the multistage eruptive and magmatic history of a small basalt shield volcano. Activity commenced calendar year (cal.) 6000 cal. yr B.P., involving minor effusive and pyroclastic volcanism until 650 cal. yr B.P. This period either represents an early, less productive phase of a single polygenetic volcano, or, alternatively, Rangitoto is better described as a volcanic complex that includes one or more buried edifices concealed by the main structure. A voluminous shield-building phase occurred 650–550 cal. yr B.P., erupting isotopically uniform subalkalic basalts (Mg# 60–64). Four batches of magma distinguished by trace-element chemistry were erupted sequentially, but they lack genetic connection via fractional crystallization or assimilation. Two of the magma batches display linear trends of decreasing incompatible trace-element abundance and increasing ratios of moderately incompatible to highly incompatible elements with decreasing age. This is consistent with cycles of progressive partial melting at the source. The final phase of activity (ca. 550–500 cal. yr B.P.) was explosive and less voluminous, producing scoria cones at the summit. This phase involved more diversity in magma compositions, including more mafic subalkalic basalt, and alkali basalt, pointing to sourcing of magmas simultaneously from different depths in the mantle. Rangitoto volcano contributes to a growing body of evidence showing that major periods of volcanism in “monogenetic” basalt fields occur at centers that have experienced multiple eruption episodes. Changes in magma composition accompany changes in eruption style, but a lack of an obvious shared pattern in magmatic evolution at various volcanoes points to the localized mantle heterogeneity and conduit systems. Hazard scenarios for regions traditionally classified as “monogenetic” need to encompass the possibility of prolonged episodes of activity and reawakening of volcanoes, a significant implication where infrastructure is built on such regions. You do not have access to this content, please speak to your institutional administrator if you feel you should have access." @default.
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• W2308478180 title "Long-lived shield volcanism within a monogenetic basaltic field: The conundrum of Rangitoto volcano, New Zealand" @default.
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