Magmatism in the South Sandwich arc / P.T. Leat, J.L. Smellie, I.L. Millar, R.D. Larter.

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245 00 ‡aMagmatism in the South Sandwich arc /‡cP.T. Leat, J.L. Smellie, I.L. Millar, R.D. Larter.
260 ## ‡aLondon :‡bGeological Society of London,‡c2003.
300 ## ‡ap. 285-313 :‡bdiags., tables, maps.
490 0# ‡aSpecial Publication ;‡v219
500 ## ‡aOffprint: Intra-oceanic subduction systems : tectonic and magmatic processes : Geological Society, London, Special Publications / R.D. Larter, P.T. Leat, eds.
520 3# ‡aExamines two volcanoes in South Sandwich Islands, Antarctica. Southern Thule in south of arc is complex volcanic edifice with three calderas and compositions ranging from mafic to silicic and tholeiitic to calc-alkaline, and lies along a cross-arc, wide-angle seismic section that reveals velocity structure of underlying arc crust. Candlemas-Vindication edifice in north of arc is low-L tholeiitic and strangely bimodal from mafic to silicic. Uses trace element variations to argue that variations in both mantle depletion and input of subducted sediment component produced diverse low-K tholeiite, tholeiite and calc-alkaline series. Primitive, mantle-derived melts fractionally crystallized by c. 36% to produce the most Mg-rich erupted basalts and high-velocity cumulitic crustal keel. Plagioclase cumulation produced abundant high-Al basalts (especially in tholeiitic series) and strongly influenced Sr abundances in magmas. However, examination of volumetric and geochemical arguments indicates that silicic rocks do not result from fractional crystallization, and are melts of amphibolitic arc crust instead.
650 07 ‡a551.1/.4 -- Geology.‡2udc
650 07 ‡a551.242.22 -- Island arcs.‡2udc
650 07 ‡a552 -- Petrology.‡2udc
650 07 ‡a552.3 -- Igneous rocks.‡2udc
650 07 ‡a551.21 -- Volcanoes.‡2udc
650 07 ‡a91(08) -- Expeditions: 1962- British Antarctic Survey.‡2udc
650 07 ‡a91(08) -- Expeditions: 1997-98 BAS.‡2udc
650 07 ‡a.000(410) -- British author.‡2udc
650 07 ‡aA -- Geophysical sciences (general).‡2local
651 #7 ‡a(*7) -- Antarctic regions.‡2udc
651 #7 ‡a(*724) -- South Sandwich Islands.‡2udc
700 1# ‡aLeat, P. T.
700 1# ‡aSmellie, J. L.
700 1# ‡aMillar, I. L.
700 1# ‡aLarter, R. D.
852 7# ‡2camdept‡bSCO‡cSPRI-PAM‡h(*724) : 551.1/.4‡9Create 1 item record‡0Migrate
916 ## ‡a133690 -- 2005/12/22 -- HS
917 ## ‡aUnenhanced record from Muscat, imported 2019
948 3# ‡a20240419 ‡bHS