UT Arlington GEOL 2313 - Melting of the mantle (15 pages)

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Melting of the mantle



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Melting of the mantle

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Lecture Notes


Pages:
15
School:
University of Texas at Arlington
Course:
Geol 2313 - Minerals and Rocks

Unformatted text preview:

Melting of the mantle Increasing temperature Intraplate igneous activity OIB continental basalts etc Decreasing D i pressure Divergent D plate l boundaries MORBs rifts back arc basins etc Adding volatiles Convergent plate boundaries arc lavas continental margins etc Plate Tectonic Igneous g Genesis 1 Mid Ocean Ridges g 2 Intracontinental Rifts 3 Island Arcs 4 Active Continental Margins g 5 Back Arc Basins 6 Ocean Island Basalts 7 Miscellaneous IntraC ti t l Activity Continental A ti it kimberlites carbonatites anorthosites Ocean ocean Island Arc IA Ocean continent Continental Arc or A i Continental Active C i l Margin M i ACM Figure 16 1 Principal subduction zones associated with orogenic volcanism and plutonism Triangles are on the overriding plate PBS Papuan Bismarck Solomon New Hebrides arc After Wilson 1989 Igneous Petrogenesis Allen Unwin Kluwer Structure of an Island Arc Figure 16 2 Schematic cross section through a typical island arc after Gill 1981 Orogenic Andesites and Plate Tectonics Springer Verlag HFU heat flow unit 4 2 x 10 6 joules cm2 sec Volcanic Rocks of Island Arcs C Complex l tectonic i situation i i andd broad b d spectrum off volcanic products High Hi h proportion ti off basaltic b lti andesite d it andd andesite d it Most andesites occur in subduction zone settings Table 16 1 Relative Proportions p of Analyzed y Island Arc Volcanic Rock Types Locality B B A A D R 2 Mt Misery Antilles lavas 17 22 49 12 0 2 Ave Antilles 17 42 39 2 1 L Lesser A Antilles till 71 22 5 3 1 Nicaragua NW Costa Rica 64 33 3 1 0 1 W Panama SE Costa Rica 34 49 16 0 0 1 Aleutians E of Adak 55 36 9 0 0 1 Aleutians Adak W 18 27 41 14 0 2 Little Sitkin Island Aleutians 0 78 4 18 0 2 Ave Japan lava ash falls 14 85 2 0 1 Isu Bonin Mariana 47 36 15 1 1 1 Kuriles 34 38 25 3 1 2 Talasea Papua Talasea 9 23 55 9 4 1 Scotia 65 33 3 0 0 1 from Kelemen 2003a and personal comunication 2 after Gill 1981 Table 4 4 B basalt B A basaltic andesite A andesite D dacite R rhyolite Basalts are



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