Drowned carbonate platforms in the Bismarck Sea, Papua New Guinea
Tóm tắt
Extinct volcanic islands in the Bismarck volcanic arc are fringed by well-developed coral reefs. Drowned platforms offshore from these islands provide evidence for subsidence in the central section of the arc, north of the Finisterre Terrane–Australia collision. Bathymetric and backscatter data collected onboard the R/V Kilo Moana in 2004 reveal regularly spaced (~200 m interval) drowned platforms at depths as much as 1,100 m below sea level. However, the adjacent mainland coast has well documented raised terraces indicating long-term uplift. Local subsidence may be due to cessation of magmatic activity and cooling, flexural loading by the uplifting Finisterre Range, loading by nearby active volcanic islands, and/or sediment loading on the seafloor north of the Finisterre Range. We present some simple models in order to test whether flexural loading can account for local subsidence. We find that volcanic and sedimentary loading can explain the inferred relative subsidence.
Tài liệu tham khảo
Abbott LD, Silver EA, Thompson PR, Filewicz MV, Schneider C, Abdoerrias (1994) Stratigraphic constraints on the development and timing of arc-continent collision in northern Papua New Guinea. J Sediment Res 64:169–183
Abers GA, McCaffrey R (1994) Active arc-continent collision: earthquakes, gravity anomalies, and fault kinematics in the Huon-Finisterre collision zone, Papua New Guinea. Tectonics 13(2):227–245
Arculus RJ, Yeats C (2007) Volcanism and tectonism of the South Bismarck microplate, Papua New Guinea. R/V Southern Surveyor Voyage Summary SS06/2007, CSIRO
Campbell JF (1984) Rapid subsidence of Kohala Volcano and its effect on coral reef growth. GeoMar Lett 4(1):31–36
Clague DA, Moore JG, Reynolds JR (2000) Formation of submarine flat-topped volcanic cones in Hawai’i. Bull Volcanol 62(3):214–233
Darwin C (1897) Coral reefs
Davies HL, Keene JB, Hashimoto K, Joshima M, Stuart JE, Tiffin DL (1987a) Bathymetry and canyons of the western Solomon Sea. Geo Mar Lett 6:181–191
Davies HL, Lock J, Tiffin DL, Honza E, Okuda Y, Murakami F, Kisimoto K (1987b) Convergent tectonics in the Huon Peninsula region, Papua New Guinea. Geo Mar Lett 7(3):143–152
Fornari DJ, Campbell JF (1987) Submarine topography around the Hawaiian Islands. US Geol Surv Prof Paper 1350:109–124
Galewsky J (1998) The dynamics of foreland basin carbonate platforms: tectonic and eustatic controls. Basin Res 10(4):409–416
Galewsky J, Silver EA, Gallup CD, Edwards RL, Potts DC (1996) Foredeep tectonics and carbonate platform dynamics in the Huon Gulf, Papua New Guinea. Geology 24(9):819–822
Geist D, Diefenbach DA, Fornari DJ, Kurz MD, Harpp K, Blusztajn J (2008) Construction of the Galápagos platform by large submarine volcanic terraces. Geochem Geophys Geosyst 9:Q03015. doi:10.1029/2007GC001795
Grigg R, Grossman E, Earle S, Gittings S, Lott D, McDonough J (2002) Drowned reefs and antecedent karst topography, Au’au Channel, S.E. Hawaiian Islands. Coral Reefs 21(1):73–82
Hamilton W (1979) Tectonics of the Indonesian region. US Geol Surv Prof Paper 1078:231–260
Hertz H (1884) Ueber das Gleichgewicht schwimmender elastischer Platten. Annalen der Physik 258(7):449–455
Johnson RW, Taylor GAM, Davies RA (1972) Geology and petrology of quaternary volcanic islands off the north coast of New Guinea. Rec Bur Miner Resour Aust 21:1–127
Jones AT (1995) Geochronology of drowned Hawaiian coral reefs. Sediment Geol 99(3–4):233–242
McKee CO, Cooke RJS, Wallace DA (1976) 1974–75 Eruptions of Karkar volcano, Papua New Guinea. In: Johnson RW (ed) Volcanism in Australasia. Elsevier, Amsterdam, pp 173–196
Milliman JD (1995) Sediment discharge to the ocean from small mountainous rivers: the New Guinea example. Geo Mar Lett 15:127–133
Moore JG, Campbell JF (1987) Age of tilted reefs, Hawaii. J Geophys Res 92(B3):2641–2646
Pigram CJ, Davies HL (1987) Terranes and the accretion history of the New Guinea orogen. Bur Miner Resour J Aust Geol Geophys 10:193–211
Stern TA, Holt WE (1994) Platform subsidence behind an active subduction zone. Nature 368(6468):233
Stevens C, McCaffrey R, Silver EA, Sombo Z, English P, van der Kevie J (1998) Mid-crustal detachment and ramp faulting in the Markham Valley, Papua New Guinea. Geology 26(9):847–850
Taylor B (1979) Bismarck Sea: evolution of a backarc basin. Geology 7:171–174
Tregoning P (2002) Plate kinematics in the western Pacific derived from geodetic observations. J Geophys Res 107(B1):2020. doi:10.1029/2001JB000406
Tregoning P, Lambeck K, Stoltz A, Morgan P, McClusky SP, van der Beek P, McQueen H, Jackson RJ, Little RP, Laing A, Murphy B (1998) Estimation of current plate motions in Papua New Guinea from global positioning system observations. J Geophys Res 103:12181–12203
Wallace L, Stevens C, Silver E, McCaffrey R, Loratung W, Hasiata S, Stanaway R, Curley R, Rosa R, Taugaloidi J (2004), GPS and seismological constraints on active tectonics and arc-continent collision in Papua New Guinea: Implications for mechanics of microplate rotations in a plate boundary zone. J Geophys Res 109, B05404. doi: 10.1029/2003JB002481
Watts AB (2001) Isostasy and flexure of the lithosphere. Cambridge University Press, Cambridge
Webster JM, Wallace L, Silver E, Applegate B, Potts D, Braga JC, Riker-Coleman K, Gallup C (2004) Drowned carbonate platforms in the Huon Gulf, Papua New Guinea. Geochem Geophys Geosyst 5:Q11008. doi:10.1029/2004GC000726
Wessel P (1996) Analytical solutions for 3-D flexural deformation of semi-infinite elastic plates. Geophys J Int 124:907–918