Journal
LITHOS
Volume 109, Issue 3-4, Pages 341-349Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.lithos.2008.06.007
Keywords
Olivine; Lattice preferred orientation; Seismic anisotropy; Val Malenco peridotite; Upper mantle; Water
Categories
Funding
- Korea Meteorological Administration [CATER 2008-5112] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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An exhumed huge body of ultramafic rocks is preserved in Val Malenco. Italy. In this study, petrofabrics and deformation microstructures of olivine in the Val Malenco peridotite were examined, and new observations of lattice preferred orientation (LPO) of olivine such as type-B and type-E LPO in the peridotite are reported. Three types, depending on the grain size, of olivine fabrics were observed: type-A fabric exhibiting the (010)[001] slip system in the large relic grain area, and type-B and type-E fabrics exhibiting the (010)[001] and (001)[100] slip systems, respectively, in the widely distributed recrystallized-grain area. The slips Occurred mainly on (010)[001], and the (001)[100] slip system has only rarely been reported to be the dominant slip system of olivine found in natural rocks. Further, seismic velocities and seismic anisotropies were calculated for the three types of fabrics found. The seismic anisotropies in the upper mantle can be attributed to the type-B, type-E, or type-A LPOs of olivine. Moreover, the anomaly in seismic low velocity in the mantle wedge can be attributed to the serpentinization as well as the mixed fabrics of the type-A, type-B, and type-E. (C) 2008 Elsevier B.V. All rights reserved.
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