Submarine lava flow direction revealed by neutron diffraction analysis in mineral lattice orientation

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doi: 10.1002/2013GC005044
Author(s): Zucali, M.; Fontana, E.; Panseri, M.; Tartarotti, P.; Capelli, S.; Ouladdiaf, B.
Author Affiliation(s): Primary:
Universita degli Studi di Milano, Dipartimento di Scienze della Terra, Milan, Italy
Institut Laue-Langevin, France
Volume Title: Geochemistry, Geophysics, Geosystems - G<sup>3</sup>
Source: Geochemistry, Geophysics, Geosystems - G>3`, 15(3), p.765-780. Publisher: American Geophysical Union and The Geochemical Society, United States. ISSN: 1525-2027
Note: In English. 58 refs.; illus., incl. 2 tables, sketch map
Summary: The ocean crust is formed by the rising of magma from mid-ocean ridges and voluminous (1-30 km3) flows of lava away from ridge axes. However, our understanding of the emplacement kinematics of submarine lava is often limited to plan view geometries of near-axis lava. Drilled cores provide in situ access to the intact internal structure of submarine lavas. We used neutron diffraction to study off-axis lava flows drilled into the uppermost crust of ODP/IODP-Site 1256 (Cocos Plate). We provide quantitative insights into submarine lava microstructures and strong evidence for a secondary lava injection into the interior of a solidifying flow of lava along the NW-SE direction parallel to the paleo-ridge axis of the East Pacific Rise. The dynamics of lava inflow are controlled by crystal abundance and the temperature of the lava-crystal mixture rather than by local seafloor topography. We provide a description of an in situ shear within submarine lavas revealed by composite shape and lattice preferred orientations, accounting for a dominant laminar nonuniform-type flow. Abstract Copyright (2014), . American Geophysical Union. All Rights Reserved.
Year of Publication: 2014
Research Program: IODP Integrated Ocean Drilling Program
ODP Ocean Drilling Program
Key Words: 07 Marine Geology and Oceanography; Bathymetry; Cocos Plate; Crust; East Pacific; East Pacific Rise; Equatorial Pacific; Integrated Ocean Drilling Program; Kinematics; Lattice; Lava flows; Leg 206; Mid-ocean ridges; Neutron diffraction data; North Pacific; Northeast Pacific; ODP Site 1256; Ocean Drilling Program; Ocean floors; Orientation; Pacific Ocean; Plate tectonics; Preferred orientation; Structural analysis; Submarine volcanoes; Upper crust; Volcanoes
Coordinates: N063500 N064500 W0915000 W0920000
Record ID: 2014046711
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