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Microtomography of Partially Molten Rocks: Three-Dimensional Melt Distribution in Mantle Peridotite
Using x-ray synchrotron microtomography, three-dimensional data on melt distribution for mantle peridotite with various melt fractions is obtained and it is shown that the porosity of the partially molten region beneath ocean ridges is controlled by a balance between viscous compaction and melting rate, not by a change in melt topology.
Networking of shear zones at the brittle-to-viscous transition (Cap de Creus, NE Spain)
A crustal-scale shear zone network at the fossil brittle-to-viscous transition exposed at Cap de Creus, NE Spain evolved by coeval fracturing and viscous, mylonitic overprinting of an existing…
A new approach using high-resolution computed tomography to test the buoyant properties of chambered cephalopod shells
A technique using high-resolution computed tomography to quantify the buoyant properties of chambered shells without reducing the shell to ideal spirals or eliminating inherent biological variability is developed, which challenges past inferences of benthic life habits based solely on calculations of negative buoyancy.
Pore formation during dehydration of a polycrystalline gypsum sample observed and quantified in a time-series synchrotron X-ray micro-tomography experiment
Abstract. We conducted an in-situ X-ray micro-computed tomography heating experiment at the Advanced Photon Source (USA) to dehydrate an unconfined 2.3 mm diameter cylinder of Volterra Gypsum. We…
Creep cavitation can establish a dynamic granular fluid pump in ductile shear zones
Evidence is presented that mechanical and chemical potentials control a syndeformational porosity generation in mid-crustal shear zones and this model explains fluid transfer through the middle crust, where strain localization in the creep regime is required for plate tectonics, the formation of giant ore deposits, mantle degassing and earthquake nucleation.
High-temperature fracturing and subsequent grain-size-sensitive creep in lower crustal gabbros: Evidence for coseismic loading followed by creep during decaying stress in the lower crust?
The mechanism of shear zone formation in lower crustal, relatively “dry” rocks is still poorly understood. We have studied the high-temperature deformation of the Hasvik gabbro (northern Norway)…
A brief guide to synchrotron radiation-based microtomography in (structural) geology and rock mechanics
This contribution outlines Synchrotron-based X-ray micro-tomography and its potential use in structural geology and rock mechanics. The paper complements several recent reviews of X-ray…
Experimental evidence of reaction‐induced fracturing during olivine carbonation
Author(s): Zhu, W; Fusseis, F; Lisabeth, H; Xing, T; Xiao, X; De Andrade, V; Karato, SI | Abstract: ©2016. American Geophysical Union. All Rights Reserved. Mineral carbonation, a process that binds…
Creep cavitation bands control porosity and fluid flow in lower crustal shear zones
Shear zones channelize fluid flow in Earth’s crust. However, little is known about deep crustal fluid migration and how fluids are channelized and distributed in a deforming lower crustal shear zone.…
Micromechanisms of shear zone propagation at the brittle-viscous transition
Our investigation of progressively strained rock samples from the margins of greenschist-facies shear zones utilizes a space-for-time approach to reveal how the mylonitic overprint of metapsammitic…