Decompression melting driving intraplate volcanism in Australia: Evidence from magnetotelluric sounding
Aivazpourporgou, Sahereh, Thiel, Stephan, Hayman, Patrick C., Moresi, Louis N., & Heinson, Graham (2015) Decompression melting driving intraplate volcanism in Australia: Evidence from magnetotelluric sounding. Geophysical Research Letters, 42(2), pp. 346-354.
A long-period magnetotelluric (MT) survey, with 39 sites covering an area of 270 by 150 km, has identified melt within the thinned lithosphere of Pleistocene-Holocene Newer Volcanics Province (NVP) in southeast Australia, which has been variously attributed to mantle plume activity or edge-driven mantle convection. Two-dimensional inversions from the MT array imaged a low-resistivity anomaly (10-30Ωm) beneath the NVP at ∼40-80 km depth, which is consistent with the presence of ∼1.5-4% partial melt in the lithosphere, but inconsistent with elevated iron content, metasomatism products or a hot spot. The conductive zone is located within thin juvenile oceanic mantle lithosphere, which was accreted onto thicker Proterozoic continental mantle lithosphere. We propose that the NVP owes its origin to decompression melting within the asthenosphere, promoted by lithospheric thickness variations in conjunction with rapid shear, where asthenospheric material is drawn by shear flow at a "step" at the base of the lithosphere.
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|Item Type:||Journal Article|
|Keywords:||Australia, decompression, magnetotelluric, melt, shear, volcanoes, Magnetotellurics, Melting, Shear flow, Shearing, Decompression melting, Lithospheric thickness, Magnetotelluric soundings, Mantle lithosphere, Southeast australia, Structural geology, accretion, lithosphere, magnetotelluric method, mantle convection, plate tectonics, volcanism|
|Divisions:||Current > Schools > School of Earth, Environmental & Biological Sciences
Current > QUT Faculties and Divisions > Science & Engineering Faculty
|Copyright Owner:||Copyright 2015 American Geophysical Union|
|Deposited On:||23 Jun 2015 06:22|
|Last Modified:||01 Aug 2015 14:02|
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