Geophysical Research Letters
Supporting Information for
Predicting the permeability of marine sediments entering subduction zones
Hugh Daigle1 and Elizabeth J. Screaton2
1Department
of Petroleum and Geosystems Engineering, University of Texas at Austin, Austin, Texas, USA
2Department
of Geological Sciences, University of Florida, Gainesville, Florida, USA
Contents of this file
Figure S1
Table S1
Introduction
This file contains Figure S1 and the caption for Table S1. Figure S1 shows how
the permeability of a mixture of clay and silt+sand varies as the porosity of the
silt+sand component changes. Table S1 contains a detailed categorization of the
expected grain size of subducted sediments at worldwide convergent margins
based on grain size measurements in Deep Sea Drilling Program (DSDP),
Ocean Drilling Program (ODP), and Integrated Ocean Drilling Program (IODP)
expedition reports. This table is provided as a separate file (2015GL064542ts01.xlsx) due to its size. References for the information used to construct Table
S1 are given at the end of this file.
1
Figure S1. Permeability variation with change in porosity of high-permeability
component. Overall porosity of the system was kept fixed at the values listed. Porosities
of the high- and low-permeability components were varied to keep the same overall
porosity. Shaded regions represent range of porosities that result in a range of ±0.5
orders of magnitude about the permeability value when the high-permeability component
porosity is equal to the overall porosity of the medium (shown by dashed lines). (a)
Variation with clay fraction of 0.2. (b) Variation with clay fraction of 0.8. Note that when
the overall porosity of the medium is 0.4, any porosity value for the high-permeability
component between 0 and 0.52 will result in less than half an order of magnitude
variation in permeability of the medium.
Table S1. Categorization of expected grain-size of subducted sediments. Table is
provided as a separate file (2015GL064542-ts01.xlsx) due to its size.
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