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• W2003197391 abstract "Research Article| November 01, 2005 Debris avalanche deposits associated with large igneous province volcanism: An example from the Mawson Formation, central Allan Hills, Antarctica O. Reubi; O. Reubi 1Department of Geology, University of Otago, P.O. Box 56, Dunedin 9001, New Zealand Search for other works by this author on: GSW Google Scholar P.-S. Ross; P.-S. Ross 1Department of Geology, University of Otago, P.O. Box 56, Dunedin 9001, New Zealand Search for other works by this author on: GSW Google Scholar J.D.L. White J.D.L. White 1Department of Geology, University of Otago, P.O. Box 56, Dunedin 9001, New Zealand Search for other works by this author on: GSW Google Scholar Author and Article Information O. Reubi 1Department of Geology, University of Otago, P.O. Box 56, Dunedin 9001, New Zealand P.-S. Ross 1Department of Geology, University of Otago, P.O. Box 56, Dunedin 9001, New Zealand J.D.L. White 1Department of Geology, University of Otago, P.O. Box 56, Dunedin 9001, New Zealand Publisher: Geological Society of America Received: 28 Nov 2004 Revision Received: 11 May 2005 Accepted: 11 Jun 2005 First Online: 08 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (2005) 117 (11-12): 1615–1628. https://doi.org/10.1130/B25766.1 Article history Received: 28 Nov 2004 Revision Received: 11 May 2005 Accepted: 11 Jun 2005 First Online: 08 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation O. Reubi, P.-S. Ross, J.D.L. White; Debris avalanche deposits associated with large igneous province volcanism: An example from the Mawson Formation, central Allan Hills, Antarctica. GSA Bulletin 2005;; 117 (11-12): 1615–1628. doi: https://doi.org/10.1130/B25766.1 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 An up-to-180-m-thick debris avalanche deposit related to Ferrar large igneous province magmatism is observed at central Allan Hills, Antarctica. This Jurassic debris avalanche deposit forms the lower part (member m1) of the Mawson Formation and is overlain by thick volcaniclastic layers containing a mixture of basaltic and sedimentary debris (member m2). The m1 deposit consists of a chaotic assemblage of breccia panels and megablocks up to 80 m across. In contrast to m2, it is composed essentially of sedimentary material derived from the underlying Beacon Supergroup. The observed structures and textures suggest that the breccias in m1 were mostly produced by progressive fragmentation of megablocks during transport but also to a lesser extent by disruption and ingestion of the substrate by the moving debris avalanche. The upper surface of the debris avalanche deposit lacks large hummocks, and sandstone breccias dominate volumetrically over megablocks within the deposits. This indicates pervasive and relatively uniform fragmentation of the moving mass and probably reflects the weak and relatively homogenous nature of the material involved. The avalanche flowed into a preexisting topographic depression carved into the Beacon sequence, and flow indicators reveal a northeastward movement. The source area is probably now hidden under the Antarctic ice sheet. Sparse basaltic bodies, which were hot and plastic during transport in m1, reveal the role of Ferrar magmatism in triggering the avalanche, possibly in relation to the emplacement of large subsurface intrusions. The documented deposits indicate that debris avalanches are among the various phenomena that can accompany the early stages of large igneous province magmatism, despite the common absence of large central volcanic edifices. Where large igneous provinces develop in association with faulting or slow preeruptive uplift accompanied by deep valley incision, there is a high probability that feeder dikes will approach the surface in areas of steep topography, allowing volcano-seismicity and fluid overpressures associated with intrusion to effectively trigger avalanches. 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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• W2003197391 title "Debris avalanche deposits associated with large igneous province volcanism: An example from the Mawson Formation, central Allan Hills, Antarctica" @default.
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