Dike transport of granitoid magmas

Abstract

Research Article| September 01, 1993 Dike transport of granitoid magmas Nick Petford; Nick Petford 1Department of Earth Sciences, University of Liverpool, P.O. Box 147, Liverpool L69 3BX, England Search for other works by this author on: GSW Google Scholar Ross C. Kerr; Ross C. Kerr 2Research School of Earth Sciences, Australian National University, GPO Box 4, Canberra, ACT 2601, Australia Search for other works by this author on: GSW Google Scholar John R. Lister John R. Lister 3Institute of Theoretical Geophysics, Department of Applied Mathematics and Theoretical Physics, University of Cambridge, Silver Street, Cambridge CB3 9EW, England Search for other works by this author on: GSW Google Scholar Author and Article Information Nick Petford 1Department of Earth Sciences, University of Liverpool, P.O. Box 147, Liverpool L69 3BX, England Ross C. Kerr 2Research School of Earth Sciences, Australian National University, GPO Box 4, Canberra, ACT 2601, Australia John R. Lister 3Institute of Theoretical Geophysics, Department of Applied Mathematics and Theoretical Physics, University of Cambridge, Silver Street, Cambridge CB3 9EW, England Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1993) 21 (9): 845–848. https://doi.org/10.1130/0091-7613(1993)021<0845:DTOGM>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 Email Permissions Search Site Citation Nick Petford, Ross C. Kerr, John R. Lister; Dike transport of granitoid magmas. Geology 1993;; 21 (9): 845–848. doi: https://doi.org/10.1130/0091-7613(1993)021<0845:DTOGM>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 Thermal and fluid-dynamical analyses suggest that for viscosities and density contrasts spanning the range considered typical for many calc-alkalic granitoids, dike ascent is a viable mechanism for the transport of large volumes of granitoid melt through the continental crust. We present calculations showing that a granitoid melt with calculated viscosity of the order of 106 Pa ⋅ s and a density contrast between magma and crust of 200 kg/m3 can be transported 30 km through the crust in ∼1 month, corresponding to a mean ascent velocity of 1 cm/s. Using analysis modified from numerical studies of the flow of basaltic magmas in dikes, we also present an expression that allows the calculation of the critical (minimum) dike or fault width required for granitic magma to ascend without freezing. For all reasonable estimates of Cordilleran granitoid viscosity and density contrast, the critical dike width is determined to be between ∼2 and 7 m. Calculated peak batholith-filling rates are orders of magnitude greater than mean cavity-opening rates based on estimated fault slippage, which is consistent with chemical evidence for intermittent supply of magma pulses. 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.