Complementarity of seismological and electromagnetic sounding methods for constraining the structure of the Martian mantle
Identifieur interne : 001E63 ( Istex/Corpus ); précédent : 001E62; suivant : 001E64Complementarity of seismological and electromagnetic sounding methods for constraining the structure of the Martian mantle
Auteurs : Antoine Mocquet ; Michel MenvielleSource :
- Planetary and Space Science [ 0032-0633 ] ; 2000.
Abstract
The complementarity of seismological and electromagnetic sounding methods for the thermodynamical characterization of the Martian mantle is discussed by illustrating the observational constraints and limitations of both methods. The increase of temperature within a few hundreds of kilometers thick Martian outer lid with conductive heat transfer should induce the presence of a seismic low-velocity zone, due to the relatively small increase of pressure within Mars. The depth of minimum velocity will help to constrain the thickness and mean thermal gradient of the lid. These parameters will be strongly constrained by electromagnetic sounding methods. At greater depths, temperature variations of the order of 400K will be detectable if seismic velocities can be determined with an accuracy better than 2%. An extrapolation of presently available laboratory data to the pressure range of Mars’ mantle predicts that the deep mantle electrical conductivity will be accessible if Mars’ mantle is cold, and mineralogically similar to the Earth's. On the other hand, the high temperature and/or the high conductivity of garnet might impede an interpretation of electromagnetic sounding data at depths greater than 300km for a nominal duration of the NetLander mission of the order of one Martian year. If the mantle is olivine-rich, the phase transitions of olivine should translate into first-order seismic and electromagnetic discontinuities, eventually smoothed if the iron content of Mars’ mantle is about twice the Earth's one. The depth of occurrence of the exothermic olivine to waldsleyite and ringwoodite transitions will provide information on the temperature of the mantle. A pyroxene-rich mantle should instead be characterized by a constant increase of seismic velocities in the depth range 800–1200km. This seismic gradient would be generated by the progressive increase of the garnet content at the expense of pyroxenes in solid solutions of non-olivine minerals.
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DOI: 10.1016/S0032-0633(00)00107-0
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<front><div type="abstract" xml:lang="en">The complementarity of seismological and electromagnetic sounding methods for the thermodynamical characterization of the Martian mantle is discussed by illustrating the observational constraints and limitations of both methods. The increase of temperature within a few hundreds of kilometers thick Martian outer lid with conductive heat transfer should induce the presence of a seismic low-velocity zone, due to the relatively small increase of pressure within Mars. The depth of minimum velocity will help to constrain the thickness and mean thermal gradient of the lid. These parameters will be strongly constrained by electromagnetic sounding methods. At greater depths, temperature variations of the order of 400K will be detectable if seismic velocities can be determined with an accuracy better than 2%. An extrapolation of presently available laboratory data to the pressure range of Mars’ mantle predicts that the deep mantle electrical conductivity will be accessible if Mars’ mantle is cold, and mineralogically similar to the Earth's. On the other hand, the high temperature and/or the high conductivity of garnet might impede an interpretation of electromagnetic sounding data at depths greater than 300km for a nominal duration of the NetLander mission of the order of one Martian year. If the mantle is olivine-rich, the phase transitions of olivine should translate into first-order seismic and electromagnetic discontinuities, eventually smoothed if the iron content of Mars’ mantle is about twice the Earth's one. The depth of occurrence of the exothermic olivine to waldsleyite and ringwoodite transitions will provide information on the temperature of the mantle. A pyroxene-rich mantle should instead be characterized by a constant increase of seismic velocities in the depth range 800–1200km. This seismic gradient would be generated by the progressive increase of the garnet content at the expense of pyroxenes in solid solutions of non-olivine minerals.</div>
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<abstract>The complementarity of seismological and electromagnetic sounding methods for the thermodynamical characterization of the Martian mantle is discussed by illustrating the observational constraints and limitations of both methods. The increase of temperature within a few hundreds of kilometers thick Martian outer lid with conductive heat transfer should induce the presence of a seismic low-velocity zone, due to the relatively small increase of pressure within Mars. The depth of minimum velocity will help to constrain the thickness and mean thermal gradient of the lid. These parameters will be strongly constrained by electromagnetic sounding methods. At greater depths, temperature variations of the order of 400K will be detectable if seismic velocities can be determined with an accuracy better than 2%. An extrapolation of presently available laboratory data to the pressure range of Mars’ mantle predicts that the deep mantle electrical conductivity will be accessible if Mars’ mantle is cold, and mineralogically similar to the Earth's. On the other hand, the high temperature and/or the high conductivity of garnet might impede an interpretation of electromagnetic sounding data at depths greater than 300km for a nominal duration of the NetLander mission of the order of one Martian year. If the mantle is olivine-rich, the phase transitions of olivine should translate into first-order seismic and electromagnetic discontinuities, eventually smoothed if the iron content of Mars’ mantle is about twice the Earth's one. The depth of occurrence of the exothermic olivine to waldsleyite and ringwoodite transitions will provide information on the temperature of the mantle. A pyroxene-rich mantle should instead be characterized by a constant increase of seismic velocities in the depth range 800–1200km. This seismic gradient would be generated by the progressive increase of the garnet content at the expense of pyroxenes in solid solutions of non-olivine minerals.</abstract>
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<notesStmt><note type="content">Fig. 1: End-member Marstherms: Model 1 after Breuer et al. (1993) and Spohn et al. (1998) (broken curve), Model 2 after Grasset and Parmentier (1998) (solid curve). The liquidus (white dots) and solidus (black dots) curves of anhydrous peridotite are plotted after Zhang and Herzberg (1994). The thickness of the outermost thermally conductive lid is either set equal to 200km (light gray area), or 300km (dark gray area) in both models. The thermal adiabatic gradient is set to a value equal to 0.1Kkm−1 in the deep mantle.</note>
<note type="content">Fig. 2: P- and S-wave velocities corresponding to the temperature profiles defined in Fig. 1 and Table 1.</note>
<note type="content">Fig. 3: A posteriori distributions of the parameters for (a) Model 1a, and (b) Model 1b. In both cases, the data sets consist of apparent resistivities computed at frequencies evenly distributed on a logarithmic scale (10 points per decade) over the range 0.1–0.0001 Hz, plus 1–5cyclesday−1 (cpd) (nF=36). In each case, a 16% Gaussian noise is added. For all the models, the a priori distribution and the marginal a posteriori distributions are digitized over a set of 71 possible resistivities evenly distributed on a logarithmic scale as 10 values per decade over the 0.001 to 10000Ωm interval. The level of grey of the (m,l) pixels corresponds to the value of the marginal a posteriori distribution of the parameter Xl for Xl=ρm: the darker the pixel, the higher the marginal a posteriori probability. On each image, the expected values (dashed curves) of the resistivities, and the resistivity profile of the model used to compute the apparent resistivities (solid curves), are also plotted.</note>
<note type="content">Fig. 4: Same as Fig. 3 for (a) Model 2a, and (b) Model 2b.</note>
<note type="content">Fig. 5: Minimum (white symbols) and maximum (black symbols) values of electrical conductivity of major mantle minerals. The values are extrapolated at high temperature after the experimental data of Duba et al. (1974), Huebner et al. (1979), Hinze et al. (1981), Li and Jeanloz (1991), Kavner et al. (1995), and Xu et al. (1998) using Eq. (6). The generic term ‘spinelle’ is used for both waldsleyite and ringwoodite, since these phases display similar values of electrical conductivity (Xu et al., 1998).</note>
<note type="content">Fig. 6: Examples of candidate electrical conductivity profiles for the Martian mantle. The minimum (white symbols) and maximum (black symbols) values are computed using Eq. (7), and the individual values of electrical conductivity displayed in Fig. 5.</note>
<note type="content">Fig. 7: Same as Fig. 3 for a ‘cold’ (Model 1a) and pure olivine mantle, and for two different values of the smoothing parameter α (Eq. (9). (a) α=5; (b) α=1.</note>
<note type="content">Table 1: End-member models of mantle temperature for Marsa</note>
<note type="content">Table 2: Physical parameters transposed from 3SMAC (Nataf and Ricard, 1996) to the pressure range of Mars’ mantlea</note>
<note type="content">Table 3: Range of experimental determination of pre-exponential factor σ0 and activation energy E∗ values for olivine, waldsleyite and ringwoodite, pyroxenes and garnetsa</note>
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<email>antoine.mocquet@chimie.univ-nantes.fr</email>
<note type="correspondence"><p>Corresponding author. Tel.: +33-0-2-51-12-54-68; fax: +33-0-2-51-12-52-68</p>
</note>
<affiliation>UMR-CNRS 6112 Laboratoire de Planétologie et Géodynamique, Faculté des Sciences et des Techniques, 2 rue de la Houssinière, BP 92208, 44322 Nantes Cedex 3, France</affiliation>
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<author xml:id="author-2"><persName><forename type="first">Michel</forename>
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<abstract xml:lang="en"><p>The complementarity of seismological and electromagnetic sounding methods for the thermodynamical characterization of the Martian mantle is discussed by illustrating the observational constraints and limitations of both methods. The increase of temperature within a few hundreds of kilometers thick Martian outer lid with conductive heat transfer should induce the presence of a seismic low-velocity zone, due to the relatively small increase of pressure within Mars. The depth of minimum velocity will help to constrain the thickness and mean thermal gradient of the lid. These parameters will be strongly constrained by electromagnetic sounding methods. At greater depths, temperature variations of the order of 400K will be detectable if seismic velocities can be determined with an accuracy better than 2%. An extrapolation of presently available laboratory data to the pressure range of Mars’ mantle predicts that the deep mantle electrical conductivity will be accessible if Mars’ mantle is cold, and mineralogically similar to the Earth's. On the other hand, the high temperature and/or the high conductivity of garnet might impede an interpretation of electromagnetic sounding data at depths greater than 300km for a nominal duration of the NetLander mission of the order of one Martian year. If the mantle is olivine-rich, the phase transitions of olivine should translate into first-order seismic and electromagnetic discontinuities, eventually smoothed if the iron content of Mars’ mantle is about twice the Earth's one. The depth of occurrence of the exothermic olivine to waldsleyite and ringwoodite transitions will provide information on the temperature of the mantle. A pyroxene-rich mantle should instead be characterized by a constant increase of seismic velocities in the depth range 800–1200km. This seismic gradient would be generated by the progressive increase of the garnet content at the expense of pyroxenes in solid solutions of non-olivine minerals.</p>
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<head><ce:title>Complementarity of seismological and electromagnetic sounding methods for constraining the structure of the Martian mantle</ce:title>
<ce:author-group><ce:author><ce:given-name>Antoine</ce:given-name>
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<ce:textfn>UMR-CNRS 6112 Laboratoire de Planétologie et Géodynamique, Faculté des Sciences et des Techniques, 2 rue de la Houssinière, BP 92208, 44322 Nantes Cedex 3, France</ce:textfn>
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<ce:text>Corresponding author. Tel.: +33-0-2-51-12-54-68; fax: +33-0-2-51-12-52-68</ce:text>
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<ce:abstract-sec><ce:simple-para>The complementarity of seismological and electromagnetic sounding methods for the thermodynamical characterization of the Martian mantle is discussed by illustrating the observational constraints and limitations of both methods. The increase of temperature within a few hundreds of kilometers thick Martian outer lid with conductive heat transfer should induce the presence of a seismic low-velocity zone, due to the relatively small increase of pressure within Mars. The depth of minimum velocity will help to constrain the thickness and mean thermal gradient of the lid. These parameters will be strongly constrained by electromagnetic sounding methods. At greater depths, temperature variations of the order of 400<ce:hsp sp="0.16"></ce:hsp>
K will be detectable if seismic velocities can be determined with an accuracy better than 2%. An extrapolation of presently available laboratory data to the pressure range of Mars’ mantle predicts that the deep mantle electrical conductivity will be accessible if Mars’ mantle is cold, and mineralogically similar to the Earth's. On the other hand, the high temperature and/or the high conductivity of garnet might impede an interpretation of electromagnetic sounding data at depths greater than 300<ce:hsp sp="0.16"></ce:hsp>
km for a nominal duration of the NetLander mission of the order of one Martian year. If the mantle is olivine-rich, the phase transitions of olivine should translate into first-order seismic and electromagnetic discontinuities, eventually smoothed if the iron content of Mars’ mantle is about twice the Earth's one. The depth of occurrence of the exothermic olivine to waldsleyite and ringwoodite transitions will provide information on the temperature of the mantle. A pyroxene-rich mantle should instead be characterized by a constant increase of seismic velocities in the depth range 800–1200<ce:hsp sp="0.16"></ce:hsp>
km. This seismic gradient would be generated by the progressive increase of the garnet content at the expense of pyroxenes in solid solutions of non-olivine minerals.</ce:simple-para>
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<mods version="3.6"><titleInfo><title>Complementarity of seismological and electromagnetic sounding methods for constraining the structure of the Martian mantle</title>
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<titleInfo type="alternative" contentType="CDATA"><title>Complementarity of seismological and electromagnetic sounding methods for constraining the structure of the Martian mantle</title>
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<name type="personal"><namePart type="given">Antoine</namePart>
<namePart type="family">Mocquet</namePart>
<affiliation>E-mail: antoine.mocquet@chimie.univ-nantes.fr</affiliation>
<affiliation>UMR-CNRS 6112 Laboratoire de Planétologie et Géodynamique, Faculté des Sciences et des Techniques, 2 rue de la Houssinière, BP 92208, 44322 Nantes Cedex 3, France</affiliation>
<description>Corresponding author. Tel.: +33-0-2-51-12-54-68; fax: +33-0-2-51-12-52-68</description>
<role><roleTerm type="text">author</roleTerm>
</role>
</name>
<name type="personal"><namePart type="given">Michel</namePart>
<namePart type="family">Menvielle</namePart>
<affiliation>E-mail: antoine.mocquet@chimie.univ-nantes.fr</affiliation>
<affiliation>CETP, UMR CNRS/UVSQ 8639-Observatoire de Saint-Maur, 4 Avenue de Neptune, 94107 Saint-Maur-des-Fossés, France</affiliation>
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<dateIssued encoding="w3cdtf">2000</dateIssued>
<dateModified encoding="w3cdtf">1999-12-17</dateModified>
<copyrightDate encoding="w3cdtf">2000</copyrightDate>
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<language><languageTerm type="code" authority="iso639-2b">eng</languageTerm>
<languageTerm type="code" authority="rfc3066">en</languageTerm>
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<abstract lang="en">The complementarity of seismological and electromagnetic sounding methods for the thermodynamical characterization of the Martian mantle is discussed by illustrating the observational constraints and limitations of both methods. The increase of temperature within a few hundreds of kilometers thick Martian outer lid with conductive heat transfer should induce the presence of a seismic low-velocity zone, due to the relatively small increase of pressure within Mars. The depth of minimum velocity will help to constrain the thickness and mean thermal gradient of the lid. These parameters will be strongly constrained by electromagnetic sounding methods. At greater depths, temperature variations of the order of 400K will be detectable if seismic velocities can be determined with an accuracy better than 2%. An extrapolation of presently available laboratory data to the pressure range of Mars’ mantle predicts that the deep mantle electrical conductivity will be accessible if Mars’ mantle is cold, and mineralogically similar to the Earth's. On the other hand, the high temperature and/or the high conductivity of garnet might impede an interpretation of electromagnetic sounding data at depths greater than 300km for a nominal duration of the NetLander mission of the order of one Martian year. If the mantle is olivine-rich, the phase transitions of olivine should translate into first-order seismic and electromagnetic discontinuities, eventually smoothed if the iron content of Mars’ mantle is about twice the Earth's one. The depth of occurrence of the exothermic olivine to waldsleyite and ringwoodite transitions will provide information on the temperature of the mantle. A pyroxene-rich mantle should instead be characterized by a constant increase of seismic velocities in the depth range 800–1200km. This seismic gradient would be generated by the progressive increase of the garnet content at the expense of pyroxenes in solid solutions of non-olivine minerals.</abstract>
<note type="content">Fig. 1: End-member Marstherms: Model 1 after Breuer et al. (1993) and Spohn et al. (1998) (broken curve), Model 2 after Grasset and Parmentier (1998) (solid curve). The liquidus (white dots) and solidus (black dots) curves of anhydrous peridotite are plotted after Zhang and Herzberg (1994). The thickness of the outermost thermally conductive lid is either set equal to 200km (light gray area), or 300km (dark gray area) in both models. The thermal adiabatic gradient is set to a value equal to 0.1Kkm−1 in the deep mantle.</note>
<note type="content">Fig. 2: P- and S-wave velocities corresponding to the temperature profiles defined in Fig. 1 and Table 1.</note>
<note type="content">Fig. 3: A posteriori distributions of the parameters for (a) Model 1a, and (b) Model 1b. In both cases, the data sets consist of apparent resistivities computed at frequencies evenly distributed on a logarithmic scale (10 points per decade) over the range 0.1–0.0001 Hz, plus 1–5cyclesday−1 (cpd) (nF=36). In each case, a 16% Gaussian noise is added. For all the models, the a priori distribution and the marginal a posteriori distributions are digitized over a set of 71 possible resistivities evenly distributed on a logarithmic scale as 10 values per decade over the 0.001 to 10000Ωm interval. The level of grey of the (m,l) pixels corresponds to the value of the marginal a posteriori distribution of the parameter Xl for Xl=ρm: the darker the pixel, the higher the marginal a posteriori probability. On each image, the expected values (dashed curves) of the resistivities, and the resistivity profile of the model used to compute the apparent resistivities (solid curves), are also plotted.</note>
<note type="content">Fig. 4: Same as Fig. 3 for (a) Model 2a, and (b) Model 2b.</note>
<note type="content">Fig. 5: Minimum (white symbols) and maximum (black symbols) values of electrical conductivity of major mantle minerals. The values are extrapolated at high temperature after the experimental data of Duba et al. (1974), Huebner et al. (1979), Hinze et al. (1981), Li and Jeanloz (1991), Kavner et al. (1995), and Xu et al. (1998) using Eq. (6). The generic term ‘spinelle’ is used for both waldsleyite and ringwoodite, since these phases display similar values of electrical conductivity (Xu et al., 1998).</note>
<note type="content">Fig. 6: Examples of candidate electrical conductivity profiles for the Martian mantle. The minimum (white symbols) and maximum (black symbols) values are computed using Eq. (7), and the individual values of electrical conductivity displayed in Fig. 5.</note>
<note type="content">Fig. 7: Same as Fig. 3 for a ‘cold’ (Model 1a) and pure olivine mantle, and for two different values of the smoothing parameter α (Eq. (9). (a) α=5; (b) α=1.</note>
<note type="content">Table 1: End-member models of mantle temperature for Marsa</note>
<note type="content">Table 2: Physical parameters transposed from 3SMAC (Nataf and Ricard, 1996) to the pressure range of Mars’ mantlea</note>
<note type="content">Table 3: Range of experimental determination of pre-exponential factor σ0 and activation energy E∗ values for olivine, waldsleyite and ringwoodite, pyroxenes and garnetsa</note>
<relatedItem type="host"><titleInfo><title>Planetary and Space Science</title>
</titleInfo>
<titleInfo type="abbreviated"><title>PSS</title>
</titleInfo>
<name type="conference"><namePart>Mars Exploration Program</namePart>
<namePart>Mars Exploration</namePart>
</name>
<name type="personal"><namePart>Sotin</namePart>
<role><roleTerm type="text">editor</roleTerm>
</role>
</name>
<genre type="journal">journal</genre>
<originInfo><dateIssued encoding="w3cdtf">200010</dateIssued>
</originInfo>
<identifier type="ISSN">0032-0633</identifier>
<identifier type="PII">S0032-0633(00)X0058-X</identifier>
<part><date>200010</date>
<detail type="issue"><title>Mars Exploration Program</title>
</detail>
<detail type="volume"><number>48</number>
<caption>vol.</caption>
</detail>
<detail type="issue"><number>12–14</number>
<caption>no.</caption>
</detail>
<extent unit="issue pages"><start>1143</start>
<end>1422</end>
</extent>
<extent unit="pages"><start>1249</start>
<end>1260</end>
</extent>
</part>
</relatedItem>
<identifier type="istex">386FF392C2AFA497B54796562FD7ECDB608297F9</identifier>
<identifier type="DOI">10.1016/S0032-0633(00)00107-0</identifier>
<identifier type="PII">S0032-0633(00)00107-0</identifier>
<accessCondition type="use and reproduction" contentType="copyright">©2000 Elsevier Science Ltd</accessCondition>
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<recordOrigin>Elsevier Science Ltd, ©2000</recordOrigin>
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