By Brian Taylor, James Natland
Published via the yank Geophysical Union as a part of the Geophysical Monograph sequence, quantity 88.
This quantity makes a speciality of the volcanic, fluid, sedimentary, and tectonic approaches taking place within the trencharc-backarc structures of the western Pacific—a average local concentration for stories of those subject matters. the result of ocean drilling and linked web site surveys within the western Pacific have introduced basic adjustments to our knowing of volcanism, crustal deformation, fluid movement, and sedimentation in energetic margins and marginal basins. Our aim here's to synthesize the result of ocean drilling in a multi-disciplinary demeanour, together with a comparability of the findings from drilling legs having comparable subject matters, and to stress the importance of those effects to the wider geoscience community.
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Additional info for Active margins and marginal basins of the western Pacific
10N Vertical Palau km I ! •• "S Fig. 24. Summaryof paleomagneticdata aroundthe Philippine Sea indicating substantialclockwiserotationssince the Eocene, after Keyarea et al. . :..... ' .. /-:.. ' ,? -' •,, .. • Magnetic anomalies: 100 Trench Y..... ""'.? :... " '[• Old lithosphere "/• '"• '•' • Infant arc crust Lff•Zoneofintense melting , sea level Early middle Eocene replacedby very depletedboniniticarc crust. At the other extreme, with a much colder mantle wedge and lessextension, no new arc crust may be formed at all; the forearc might eventually consist simply of stretchedand faulted older oceanic crust.
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A. Ewart, J. M. Hergt, and W. B. Bryan, Sumail ophiolite (Oman), Tectonophysics, 151, 247-274, Geochemistry of igneous rocks from ODP site 841, Tonga forearc. in Proc. ODP, Sci. Results 135, J. Hawkins, L. 1988. , and W. B. Bryan, Petrographyand geochemistryof Parson, J. , pp. 625-646, Ocean Drilling the igneousrocksfrom 'Eua, Tonganislands,Geol. Am. Program, College Station, TX, 1994. Bull, 83,3281-3298, 1972. , and C. 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.