Geochemical characteristics of basaltic volcanism within back-arc basins

Geological Society Special Publication - Tập 16 Số 1 - Trang 59-76 - 1984
Andrew D. Saunders1,2, J. Tarney2
1Department of Geology, Bedford College, Regent’s Park London NW1 4NS, U.K.
2Department of Geology, Bennett Building, University of Leicester Leicester LE1 7RH, U.K.

Tóm tắt

Summary Back-arc basins are formed by extensional processes similar to those occurring at mid-ocean ridges. However, whereas the magmas erupted along the major ocean ridges are predominantly LIL element-, Ta- and Nb-depleted N-type MORB, many back-arc basins are floored by basalts transitional between N-type MORB and island arc or even calc-alkaline basalts (viz. enrichment of LIL elements (K, Rb, Ba, Th) relative to HFS elements (Nb, Ta, Zr, Hf, Ti)). On a broad scale, it is possible to relate basalt composition, tectonic setting of the basin, and maturity of the adjacent subduction zone. Thus, the Parece Vela Basin, formed during the earliest stages of the Mariana subduction system, is floored by basalts indistinguishable from N-type MORB, whereas the later Mariana Trough is erupting N-type MORB and basalts with calc-alkaline characteristics, commonly in close spatial proximity. The calc-alkaline component is best developed in narrow, ensialic basins such as Bransfield Strait, where the extension is adjacent to mature, continent-based magmatic arcs. This range of compositions, from N-type MORB to calc-alkaline basalt, can be satisfactorily explained only by invoking chemical variations in the composition of the mantle material supplying the back-arc basin crust. Two major processes may be suggested: (i) selective contamination of the mantle wedge by LIL-enriched hydrous fluids, perhaps together with sediments, derived from the descending, dehydrating oceanic lithosphere; and (ii) repeated melt (and incompatible element) extraction during basalt genesis. The former process will enrich the mantle source of back-arc basalts with LIL elements; the latter will deplete the source in all incompatible elements, but the net effect of both processes is to increase the LIL/HFS element ratio of the source regions. Consequently, as the subduction zone matures, the LIL/HFS element ratio of successive back-arc basalts will be expected to increase, from initial N-type MORB ‘background’ values, to ratios more typical of island-arc basalts. The model has implications for mantle dynamics in back-arc regions, because transfer of material from the subducted slab may destabilize the overlying mantle, potentially leading to diapiric uprise when tectonic conditions permit extension.

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Tài liệu tham khảo

10.1086/649739

Atwater T., Molnar P. , Kovach R. L., Nur A. Relative motion of the Pacific and North American Plates deduced from sea-floor spreading in the Atlantic, Indian and South Pacific Oceans 1973 13 Proc. Conf. Tectonic Problems in the San Andreas Fault System 136 148 Stanford Univ. Pub. Geol. Sci.

10.1038/296525a0

10.1016/0012-821X(72)90052-0

10.1016/0025-3227(77)90045-7

Barker P. F., Griffiths D. H. The evolution of the Scotia Ridge and Scotia Sea Phil. Trans. R. Soc. London 1972 A271 151 183

Barker P. F., Hill I. Back-arc extension in the Scotia Sea Phil. Trans. R. Soc. London 1981 A300 249 262

10.1016/0012-821X(79)90211-5

Bougault H., Treuil M., Joron J.-L. , Melson W. G., Rabinowitz P. D. , et al. Trace elements in basalts from 23°N and 36°N in the Atlantic Ocean: fractional crystallization, partial melting and heterogenity of the upper mantle Init. Rep. Deep Sea drill. Proj. 1978 45 Washington, D.C. U.S. Government Printing Office 493 506

10.1016/0012-821X(82)90040-1

Dalziel I. W. D. Back-arc extension in the southern Andes: a review and critical reappraisal Phil. Trans. R. Soc. London 1981 A300 319 355

10.1038/250291a0

10.1016/0016-7037(78)90003-0

10.1130/0091-7613(1975)3<53:PKRICM>2.0.CO;2

10.1086/628456

10.1007/BF00374446

10.1029/JB079i035p05507

10.1093/petrology/19.3.463

Fryer P., Sinton J. M., Philpotts J. A. , Hussong D. M., Uyeda S. , et al. Basaltic glasses from the Mariana Trough Init. Rep. Deep Sea drill. Proj. 1981 60 Washington, D.C. U.S. Government Printing Office 601 609

10.1016/0016-7037(79)90196-0

10.1016/0016-7037(68)90108-7

10.1130/0016-7606(1976)87<1384:CAAOLB>2.0.CO;2

Green D. H. Composition of basaltic magmas as indicators of conditions of origin: application to oceanic volcanism Phil. Trans. R. Soc. London 1971 A268 707 725

10.1144/gsjgs.134.2.0235

Hart S. R. K, Rb, Cs, Sr and Ba contents and Sr isotope ratios of ocean floor basalts Phil. Trans. R. Soc. London 1971 A268 573 587

10.1007/BF00413167

10.1016/0012-821X(72)90023-4

10.1016/0012-821X(79)90189-4

10.1016/0012-821X(76)90190-4

Hawkins J. W. , Talwani M., Pitman W. C. Petrologic and geochemical characteristics of marginal basin basalts Island Arcs, Deep Sea Trenches, and Back-Arc Basins 1977 Washington, D.C. American Geophysical Union 355 365 Maurice Ewing Series I

Herron E. M., Tucholke B. E. , Hollister C. D., Craddock C. , et al. Sea-floor magnetic patterns and basement structure in the southwestern Pacific Init. Rep. Deep Sea drill. Proj. 1976 35 Washington, D.C. U.S. Government Printing Office 263 278

Hole M. J. Saunders A. D. Marriner G. F. Tarney J. Subduction of pelagic sediments: implications for the origin of Ceanomalous basalts from the Mariana Islands J. geol. Soc. London In press

Hussong D. M., Uyeda S. , Hussong D. M., Uyeda S. , et al. Tectonic processes and the history of the Mariana Arc: a synthesis of the results of Deep Sea Drilling Project Leg 60 Init. Rep. Deep Sea drill. Proj. 1981 60 Washington, D.C. U.S. Government Printing Office 909 929

Hussong D. M., Uyeda S. , et al. Init. Rep. Deep Sea drill. Proj. 1981 60 Washington, D.C. U.S. Government Printing Office 929 pp

10.1139/e71-055

Joron J.-L., Bollinger C., Quisefit J. P., Bougault H., Treuil M. , Donnelly T., Francheteau J. , et al. Trace elements in Cretaceous basalts at 25°N in the Atlantic Ocean: alteration, mantle compositions, and magmatic processes Init. Rep. Deep Sea drill. Proj. 1979 51–53 Washington, D.C. U.S. Government Printing Office 1087 1099

10.1029/JB075i002p00239

10.1029/JB076i011p02542

Karig D. E. , Donath F. A. Evolution of arc systems in the western Pacific Ann. Rev. Earth planet. Sci. 1974 2 51 75

10.1016/0012-821X(72)90272-5

Karig D. E., Kay R. W. Fate of sediments on the descending plate at convergent margins Phil. Trans. R. Soc. London 1981 A301 233 251

10.1086/628541

10.1029/JB075i008p01585

Kroenke L., Scott R. , et al. Init. Rep. Deep Sea drill. Proj. 1980 59 Washington, D.C. U.S. Government Printing Office 820 pp

Kuno H. Lateral variation of basalt magma across continental margins and island arcs Pap. geol. Surv. Can. 1966 66–15 317 336

Larson R. L. Bathymetry magnetic anomalies and plate tectonic history at the mouth of the Gulf of California 1972 83 3345 3360 Bull. geol. Soc. Am.

10.1016/0040-1951(78)90167-1

10.1016/0012-821X(76)90154-0

10.2343/geochemj.12.127

10.1016/0012-821X(79)90157-2

Marsh N. G., Saunders A. D., Tarney J., Dick H. J. B. , DeVries Klein G., Kobayashi K. , et al. Geochemistry of basalts from the Shikoku and Daito Basins, Deep Sea Drilling Project Leg 58 Init. Rep. Deep Sea drill. Proj. 1980 58 Washington, D.C. U.S. Government Printing Office 805 842

Mattey D. P., Marsh N. G., Tarney J. , Kroenke L., Scott R. , et al. The geochemistry, mineralogy and petrology of basalts from the West Philippine and Parece Vela Basins and from the Palau-Kyushu and West Mariana Ridges, Deep Sea Drilling Project Leg 59 Init. Rep. Deep Sea drill. Proj. 1980 59 Washington, D.C. U.S. Government Printing Office 753 800

10.1130/0016-7606(1976)87<1358:PASIDB>2.0.CO;2

10.1139/e77-079

10.1016/0012-821X(78)90187-5

10.1126/science.161.3847.1238

10.1016/0012-821X(79)90065-7

10.1016/0012-821X(80)90043-6

10.1016/0012-821X(77)90100-5

10.1016/0040-1951(71)90058-8

10.1016/0040-1951(75)90010-4

10.1016/0012-821X(73)90129-5

Pearce J. A., Alabaster T., Shelton A. W., Searle M. P. The Oman Ophiolite as a Cretaceous arc-basin complex: evidence and implications Phil. Trans. R. Soc. London 1981 A300 299 317

Roach P. J. Geophysical investigation into the evolution of Bransfield Strait 1978 Unpublished Ph.D. thesis University of Birmingham

Saunders A. D. Petrology and geochemistry of alkali basalts from Jason Peninsula, Oscar II Coast Bull. Br. Antarct. Surv. 1982 55 1 9

Saunders A. D. , Robinson P., Lewis B. T. R. , et al. The Gulf of California: geochemistry of basalts recovered during Leg 65 of the Deep Sea Drilling Project Init. Rep. Deep Sea drill. Proj. 1983 65 Washington, D.C. U.S. Government Printing Office 591 622

10.1144/gsjgs.139.3.0335

Saunders A. D., Fornari D. J., Joron J.-L., Tarney J., Treuil M. , Curray J. R., Moore D. G. , et al. Geochemistry of basic igneous rocks, Gulf of California, Deep Sea Drilling Project Leg 64 Init. Rep. Deep Sea drill. Proj. 1982b 64 Washington, D.C. U.S. Government Printing Office 595 642

10.1016/0016-7037(79)90165-0

10.1016/0012-821X(80)90050-3

Saunders A. D., Tarney J., Marsh N. G., Wood D. A. , Panayiotou A. Ophiolites as ocean crust or marginal basin crust: a geochemical approach 1980b Proc. int. Ophiolite Conf. Nicosia, Cyprus 193 204

10.1130/0016-7606(1979)90<237:GOMMBF>2.0.CO;2

Saunders A. D., Weaver S. D., Tarney J. , Craddock C. The pattern of Antarctic Peninsula plutonism Antarctic Geoscience 1982c Madison University of Wisconsin Press 305 314

10.1007/BF00371545

10.1016/0040-1951(79)90341-X

Sun S.-S. Lead isotopic study of young volcanic rocks from mid-ocean ridges, ocean islands and island arcs Phil. Trans. R. Soc. London 1980 A297 409 445

10.1016/0012-821X(79)90013-X

Tarney J., Saunders A. D., Mattey D. P., Wood D. A., Marsh N. G. Geochemical aspects of back-arc spreading in the Scotia Sea and western Pacific Phil. Trans. R. Soc. London 1981 A300 263 285

Tarney J., Wood D. A., Saunders A. D., Cann J. R., Varet J. Nature of mantle heterogeneity in the North Atlantic; evidence from Deep Sea Drilling Phil. Trans. R. Soc. London 1980 A297 179 202

10.1016/0016-7037(64)90129-2

10.1016/0009-2541(79)90050-0

Toksöz M. N., Bird P. , Talwani M., Pitman W. C. Formation and evolution of marginal basins and continental plateaus Island Arcs, Deep Sea Trenches, and Back-Arc Basins 1977 Washington, D.C. American Geophysical Union 379 393 Maurice Ewing Series I

10.1130/0016-7606(1974)85<1159:PTATJI>2.0.CO;2

Verma S. , Curray J. R., Moore D. G. , et al. Magnetic properties and incompatible element geochemistry of some igneous rocks from Deep Sea Drilling Project Leg 64 Init. Rep. Deep Sea drill. Proj. 1982 64 Washington, D.C. U.S. Government Printing Office 667 673

Watanabe T., Langseth M. G., Anderson R. N. , Talwani M., Pitman W. C. Heat flow in back-arc basins of the western Pacific Island Arcs, Deep Sea Trenches, and Back-Arc Basins 1977 Washington, D.C. American Geophysical Union 137 163 Maurice Ewing Series I

Watkins J. S., McMillen K. J., Bachman S. B., Shipley T. H., Moore J. C., Angevine C. , Watkins J. S., Moore J. C. , et al. Tectonic synthesis, Leg 66: transect and vicinity Init. Rep. Deep Sea drill. Proj. 1981 66 Washington, D.C. U.S. Government Printing Office 837 849

10.1016/0012-821X(75)90238-1

10.1038/279689a0

10.1007/BF00371897

Weissel J. K. , Talwani M., Pitman W. C. Evolution of the Lau Basin by the growth of small plates Island Arcs, Deep Sea Trenches, and Back-Arc Basins 1977 Washington, D.C. American Geophysical Union 429 436 Maurice Ewing Series I

Weissel J. K. Magnetic lineations in marginal basins of the western Pacific Phil. Trans. R. Soc. London 1981 A300 233 247

10.1038/296821a0

Wood D. A., Marsh N. G., Tarney J., Joron J.-L., Fryer P., Treuil M. , Hussong D. M., Uyeda S. , et al. Geochemistry of igneous rocks recovered from a transect across the Mariana Trough, Arc, Fore-arc, and Trench, Sites 453 through 461, Deep Sea Drilling Project Leg 60 Init. Rep. Deep Sea drill. Proj. 1981 60 Washington, D.C. U.S. Government Printing Office 611 645

Wood D. A., Mattey D. P., Joron J.-L., Marsh N. G., Tarney J., Treuil M. , Kroenke L., Scott R. , et al. A geochemical study of 17 selected samples from basement cores recovered at Sites 447, 448, 449, 450 and 451, Deep Sea Drilling Project Leg 59 Init. Rep. Deep Sea drill. Proj. 1980 59 Washington, D.C. U.S. Government Printing Office 743 752

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Geological Society Special Publication

Tập 16 Số 1

59-76

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