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The Tonga-Kermadec arc and Havre-Lau back-arc system : Their role in the development of tectonic and magmatic models for the western Pacific

Identifieur interne : 000194 ( PascalFrancis/Checkpoint ); précédent : 000193; suivant : 000195

The Tonga-Kermadec arc and Havre-Lau back-arc system : Their role in the development of tectonic and magmatic models for the western Pacific

Auteurs : Ian E. M. Smith [Nouvelle-Zélande] ; Richard C. Price [Nouvelle-Zélande]

Source :

RBID : Pascal:07-0186345

Descripteurs français

English descriptors

Abstract

The convergent plate boundary marked by the Tonga-Kermadec arc system is one of the clearest examples of an intra-oceanic arc on the modem Earth. Arising from ground breaking research in the 1970's and continuing through the present, the arc has become a testing ground for defining and explaining models for the tectonic and magmatic evolution of intra-oceanic subduction systems. Despite its simple oceanic setting the arc shows significant variations along its length in terms of rock types and structure and because of the lack of involvement of continental crust these allow refinement of the details of or models of how arcs develop and evolve. Of particular importance are the variations in convergence rates and vectors between the major plates and the effect these have on the tectonic evolution of the arc and back-arc. The erupted rocks of the arc have provided the means of testing the contribution of subducted sediment, slab, mantle wedge and overlying crust and most recently tests of P-T-time paths for recycled sediments. Although the arc is dominated by basalts and basaltic andesites, there is increasing evidence for significant proportions of silicic magmas erupted in recent times. Silicic volcanism is also evidenced in the presence of caldera structures revealed by detailed multibeam mapping that have been a feature of research in the last decade. As we enter the 21st century, the Tonga-Kermadec arc continues as an archetypical natural laboratory for the testing of new ideas in subduction zone tectonics and petrology.


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Pascal:07-0186345

Le document en format XML

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<title xml:lang="en" level="a">The Tonga-Kermadec arc and Havre-Lau back-arc system : Their role in the development of tectonic and magmatic models for the western Pacific</title>
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<div type="abstract" xml:lang="en">The convergent plate boundary marked by the Tonga-Kermadec arc system is one of the clearest examples of an intra-oceanic arc on the modem Earth. Arising from ground breaking research in the 1970's and continuing through the present, the arc has become a testing ground for defining and explaining models for the tectonic and magmatic evolution of intra-oceanic subduction systems. Despite its simple oceanic setting the arc shows significant variations along its length in terms of rock types and structure and because of the lack of involvement of continental crust these allow refinement of the details of or models of how arcs develop and evolve. Of particular importance are the variations in convergence rates and vectors between the major plates and the effect these have on the tectonic evolution of the arc and back-arc. The erupted rocks of the arc have provided the means of testing the contribution of subducted sediment, slab, mantle wedge and overlying crust and most recently tests of P-T-time paths for recycled sediments. Although the arc is dominated by basalts and basaltic andesites, there is increasing evidence for significant proportions of silicic magmas erupted in recent times. Silicic volcanism is also evidenced in the presence of caldera structures revealed by detailed multibeam mapping that have been a feature of research in the last decade. As we enter the 21st century, the Tonga-Kermadec arc continues as an archetypical natural laboratory for the testing of new ideas in subduction zone tectonics and petrology.</div>
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<s5>03</s5>
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<s5>04</s5>
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<s5>07</s5>
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<s5>07</s5>
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<s0>Affinement</s0>
<s5>08</s5>
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<s0>refinement</s0>
<s5>08</s5>
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<s0>Afinamiento</s0>
<s5>08</s5>
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<fC03 i1="09" i2="2" l="FRE">
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<s5>09</s5>
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<s5>09</s5>
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<s0>Sédiment subducté</s0>
<s5>10</s5>
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<s5>10</s5>
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<s5>11</s5>
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<s5>11</s5>
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<s0>Losa</s0>
<s5>11</s5>
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<fC03 i1="12" i2="2" l="FRE">
<s0>Manteau</s0>
<s5>12</s5>
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<s5>12</s5>
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<s5>12</s5>
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<fC03 i1="13" i2="2" l="FRE">
<s0>Croûte terrestre</s0>
<s5>13</s5>
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<s5>13</s5>
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<s0>Basalte</s0>
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<s0>Andésite basaltique</s0>
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<s5>15</s5>
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<s0>basaltic andesite</s0>
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<s0>Magma</s0>
<s5>16</s5>
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<s0>magmas</s0>
<s5>16</s5>
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<s0>Magma</s0>
<s5>16</s5>
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<fC03 i1="17" i2="2" l="FRE">
<s0>Volcanisme</s0>
<s5>17</s5>
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<s5>17</s5>
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<s5>18</s5>
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<s0>calderas</s0>
<s5>18</s5>
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<fC03 i1="18" i2="2" l="SPA">
<s0>Caldera</s0>
<s5>18</s5>
</fC03>
<fC03 i1="19" i2="2" l="FRE">
<s0>Zone subduction</s0>
<s5>19</s5>
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<fC03 i1="19" i2="2" l="ENG">
<s0>subduction zones</s0>
<s5>19</s5>
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<s0>Zona subducto</s0>
<s5>19</s5>
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<fC03 i1="20" i2="2" l="FRE">
<s0>Fossé</s0>
<s5>20</s5>
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<fC03 i1="20" i2="2" l="ENG">
<s0>troughs</s0>
<s5>20</s5>
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<fC03 i1="21" i2="2" l="FRE">
<s0>Iles Tonga</s0>
<s2>NG</s2>
<s5>61</s5>
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<s0>Tonga</s0>
<s2>NG</s2>
<s5>61</s5>
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<s0>Bassin Lau</s0>
<s2>NG</s2>
<s5>62</s5>
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<fC03 i1="22" i2="2" l="ENG">
<s0>Lau Basin</s0>
<s2>NG</s2>
<s5>62</s5>
</fC03>
<fC03 i1="22" i2="2" l="SPA">
<s0>Cuenca Lau</s0>
<s2>NG</s2>
<s5>62</s5>
</fC03>
<fC07 i1="01" i2="2" l="FRE">
<s0>Roche volcanique</s0>
<s2>NV</s2>
</fC07>
<fC07 i1="01" i2="2" l="ENG">
<s0>volcanic rocks</s0>
<s2>NV</s2>
</fC07>
<fC07 i1="01" i2="2" l="SPA">
<s0>Roca volcánica</s0>
<s2>NV</s2>
</fC07>
<fC07 i1="02" i2="2" l="FRE">
<s0>Roche ignée</s0>
</fC07>
<fC07 i1="02" i2="2" l="ENG">
<s0>igneous rocks</s0>
</fC07>
<fC07 i1="02" i2="2" l="SPA">
<s0>Roca ignea</s0>
</fC07>
<fC07 i1="03" i2="2" l="FRE">
<s0>Andésite</s0>
<s2>NV</s2>
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<s0>andesites</s0>
<s2>NV</s2>
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<fC07 i1="03" i2="2" l="SPA">
<s0>Andesita</s0>
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<s2>NG</s2>
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<s0>Océanie</s0>
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<fC07 i1="05" i2="2" l="ENG">
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<s0>Océan Pacifique</s0>
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<fC07 i1="06" i2="2" l="ENG">
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<fC07 i1="06" i2="2" l="SPA">
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<s1>122</s1>
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<fN44 i1="01">
<s1>OTO</s1>
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<fN82>
<s1>OTO</s1>
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<affiliations>
<list>
<country>
<li>Nouvelle-Zélande</li>
</country>
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<tree>
<country name="Nouvelle-Zélande">
<noRegion>
<name sortKey="Smith, Ian E M" sort="Smith, Ian E M" uniqKey="Smith I" first="Ian E. M." last="Smith">Ian E. M. Smith</name>
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<name sortKey="Price, Richard C" sort="Price, Richard C" uniqKey="Price R" first="Richard C." last="Price">Richard C. Price</name>
</country>
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