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Measurement of Activation Volume for Creep of Dry Olivine at Upper-Mantle Conditions

Journal Article · · Journal of Geophysical Research. Solid Earth
DOI:https://doi.org/10.1029/2018jb015853· OSTI ID:1609770
 [1];  [2]
  1. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); Apple Inc., Cupertino CA (United States); DOE/OSTI
  2. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Olivine is the most abundant and among the weakest phases in Earth's upper mantle, and thus, its rheological properties play a critical role in governing thermal structure and convective flow in the upper mantle. A persistent obstacle to constraining the in situ flow properties of olivine by laboratory experiment has been the difficulty in resolving the effect of pressure, which is weak within the 0- to ~2-GPa pressure range of conventional laboratory deformation instruments but potentially strong over the 1- to ~14-GPa range of the upper mantle. Using a deformation-DIA, one of a new generation of bonafide deformation devices designed for operation to ≥10 GPa, we have deformed dry, polycrystalline San Carlos olivine in high-temperature creep with the singular intent of providing the best achievable measurement of activation volume V* and a comprehensive statement of uncertainty. Under strictly dry conditions, at constant temperature (1,373 K) and strain rate (1 × 10-5 s-1), varying only pressure (1.8 to 8.8 GPa), we measure V* = 15 ± 5 cm3/mol. We have reproduced the well-known mechanism change from [100]-slip to [001]-slip near 5 GPa and determined that, whatever the change in V* associated with the change in slip system, the effective value of 15 ± 5 cm3/mol is still accurate for modeling purposes in the 2- to 9-GPa pressure range. This is a substantial pressure effect, which in the absence of a temperature gradient would represent a viscosity increase from the top to bottom of the upper mantle of 5 ± 2 orders of magnitude.
Research Organization:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
FG02-07ER15839
OSTI ID:
1609770
Alternate ID(s):
OSTI ID: 1476971
Journal Information:
Journal of Geophysical Research. Solid Earth, Journal Name: Journal of Geophysical Research. Solid Earth Journal Issue: 10 Vol. 123; ISSN 2169-9313
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (6)

The Thermal State and Interior Structure of Mars journal November 2018
Global Analysis of Experimental Data on the Rheology of Olivine Aggregates journal January 2019
Low‐Temperature Plasticity in Olivine: Grain Size, Strain Hardening, and the Strength of the Lithosphere journal June 2019
Evolution of the Josephine Peridotite Shear Zones: 1. Compositional Variation and Shear Initiation journal December 2019
The thermal state and interior structure of Mars text January 2018
Low-Temperature Plasticity in Olivine: Grain Size, Strain Hardening, and the Strength of the Lithosphere text January 2019

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