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SUMMARY:Physical Properties of Partially Molten Rocks from Microtomography
  Experiments and Digital Rock Physics - Wenlu Zhu (University of Maryland\
 , College Park)
DTSTART:20160411T123000Z
DTEND:20160411T133000Z
UID:TALK65389@talks.cam.ac.uk
CONTACT:INI IT
DESCRIPTION:<span>Co-authors: Kevin Miller (Stanford University)\, Laurent
  Montesi (University of Maryland)\, Glenn Gaetani (Woods Hole Oceanographi
 c Institution)<br></span><span><br>Better constraints on rates of melt mig
 ration within the partially molten regions of the upper mantle are require
 d to advance our current understanding of various dynamic processes at oce
 an ridges. In this study\, we synthesized texturally equilibrated mono- an
 d polymineralic aggregates containing various amounts of partial melt and 
 characterized the 3-dimensional (3-D) distribution of melt using synchrotr
 on-based x-ray microtomography. With the availability of the high-resoluti
 on 3D melt distribution\, we developed digital rock physics models to calc
 ulate the physical properties of partially molten rocks. We focus on the c
 haracteristic change in melt geometry as a function of melt fraction and l
 ithological variation\, and how they affect the transport and elastic prop
 erties. Our results indicate that 1) the permeability and melt fraction ar
 e related by a power-law relation with an exponent of ~2.7 and geometric f
 actor of 57&plusmn\;28 (Miller et al.\, 2014)\; 2) the bulk electrica l co
 nductivity also follows a power-law relationship with melt fraction\, with
  the exponent is ~1.3 and the geometric factor 0.66&plusmn\;0.06 (Miller e
 t al.\, 2015)\; 3) in a partially molten rock\, in general\, the fluid pat
 hways differ from\, and are more tortuous than the electric current pathwa
 ys\; 4) lithological melt partitioning is observed: the presence of pyroxe
 ne causes melt focusing in olivine-rich regions of partially molten harzbu
 rgite. We quantified the effect of lithological partitioning on transport 
 properties.</span>
LOCATION:Seminar Room 1\, Newton Institute
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