Active margins and marginal basins of the western Pacific by Brian Taylor, James Natland

By Brian Taylor, James Natland

Published by means of the yankee Geophysical Union as a part of the Geophysical Monograph sequence, quantity 88.

This quantity makes a speciality of the volcanic, fluid, sedimentary, and tectonic tactics taking place within the trencharc-backarc platforms of the western Pacific—a typical local concentration for stories of those subject matters. the result of ocean drilling and linked web site surveys within the western Pacific have introduced primary alterations to our figuring out of volcanism, crustal deformation, fluid stream, and sedimentation in lively margins and marginal basins. Our aim this is to synthesize the result of ocean drilling in a multi-disciplinary demeanour, together with a comparability of the findings from drilling legs having related topics, and to stress the importance of those effects to the wider geoscience community.

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Indeedrepresentancient"infantarcs". , and F. J. Vine, Spreadingevolutionof the Troodos Theseobservationsin the Izu-Mariana-Boninsystemhave ophiolite, Cyprus, Geology, 19, 637-640, 1991. , and F. J. Vine, The structure of ridge-transform intersections:evidence from the Troodos ophiolite, Cyprus, existednearly fifteen yearsago beforethe resultsof DSDP in Ophiolitesand Their Modem OceanicAnalogues,editedby leg 60 documentedin-situ Eoceneboniniticbasementin the L. M. Parson,B. J. Murton, and P. , Geol.

PACIFIC TRANSFORM PLATE MARGIN 7. DISCUSSION ASTHENOSPHERE The detailedgeological,geophysical, anddrillshipstudies in the Izu-Bonin-Mariana forearc demonstrate that the forearc formedby the emplacement of voluminous middleandlate Eocene boninites, island arc tholeiites, and their differentiates andplutonicroots. Thisphaseof forearcvolcanism lasted10-15 millionyears,afterwhichthearclocalizedalonga line200300 km behind the trench and built the centralized edifices diagnostic of a maturevolcanicarc.

J. Hawkesworth, The Pleistocene-Recent Tonga-Kermedecarc lavas:interpretationof new isotopicand petrological implications, in Ophiolites and Oceanic rare earth data in terms of a depletedmantle sourcemodel. J. Lithosphere, Geol. , London, Spec. , 13, 71-82, 1984. Clift, P. , Controls on the sedimentary and subsidence history of an active plate margin:an examplefrom the Tonga Arc (Southwest Pacific), in Proc. ODP, Sci. Result, 135, J. Hawkins, L. Parson, J. , pp. 173-188, Ocean Drilling Program,College Station,TX, 1994.

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