Abstract
The Manus Basin in the eastern Bismarck Sea is a fastopening backarc basin behind the New Britain arc-trench system. Within the basin, motion between the Pacific and Bismarck plates about a pole located at 11° S, 145° E, occurs along three major leftlateral transform faults and a variety of extensional segments. We interpret SeaMARC II sidescan and other geophysical data to show that a Brunhes age plate reorganization created new extensional boundaries and a microplate between the NW-trending Willaumez, Djaul, and Weitin transforms. Two linked spreading segments formed in backarc basin crust between the Willaumez and Djaul transforms: the ESE-trending extensional transform zone (ETZ) in the west and the Manus spreading center (MSC) in the east. Positively magnetized crust on the MSC forms a wedge varying in width from 72 km at its southwest end to zero at its northeast tip, with corresponding Brunhes spreading rates varying from 92 mm/yr to zero. The MSC forms the northwestern boundary of the 100 km-scale Manus microplate and opens at 51°/m.y. about a pole near its apex at 3°02′S, 150°32′E. Opposite the MSC, bordering the arc margin of New Britain, the microplate is bound by a zone of broadly distributed strike slip motion, extension, and volcanism. Within this area, the Southern Rifts contain a series of grabens partially floored by lava flows. Left-lateral motion between the Pacific and Bismarck plates appears to drive the counterclockwise pivoting motion of the Manus microplate and the complementary wedge-like opening of the MSC and the Southern Rifts. The pivoting motion of the microplate has resulted in compressional areas along its NE and SW boundaries with the Pacific and Bismarck plates respectively. East of the microplate, between the Djaul and Weitin transforms and within the arc margin of New Ireland, another zone of broad extension referred to as the Southeast Rifts takes up opening in a pull-apart basin. There, en echelon volcanic ridges may be the precursors of spreading segments, but erupted lavas include calcalkaline volcanics. Kinematic modeling and marine geophysical observations indicate that the responses to similar amounts of extension in the eastern Manus Basin have varied as a function of the different types of pre-existing crust: arc crust tectonically stretched over a broad area whereas backarc crust underwent relatively little stretching before accommodating extension by seafloor spreading.
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Bevis, M., Taylor, F. W., Schutz, B. E., Recy, J., Isacks, B. L., Helu, S., Singh, R., Kendrick, E., Stowell, J., Taylor, B. and Calmant, S., 1995, Geodetic Observations of Very Rapid Convergence and Back-Arc Extension at the Tonga Arc, Nature 374, 249–251.
Binns, R. A. and Scott, S. D., 1993, Actively Forming Polymetallic Deposits Associated with Felsic Volcanic Rocks in the Eastern Manus Backarc Basin, Papua New Guinea, Economic Geology 88, 2226–2236.
Both, R., Crook, K., Taylor, B., Brogan, S., Chappell, B., Frankel, E., Liu, L., Sinton, J. and Tiffin, D., 1986, Hydrothermal Chimneys and Associated Fauna in the Manus Back-Arc Basin, Papua New Guinea, EOS; Trans. Am. Geophys. Union 67, 489–490.
Cande, S. C. and Kent, D. V., 1995, Revised Calibration of the Geomagnetic Polarity Timescale for the Late Cretaceous and Cenozoic, J. Geophys. Res. 100, 6093–6095.
Carbotte, S. and Macdonald, K., 1992, East Pacific Rise 8°–10°30′ N: Evolution of Ridge Segments and Discontinuities from SeaMARC II and Three-Dimensional Magnetics Studies, J. Geophys. Res. 97, 6959–6982.
Carey, S. W., 1958, The Tectonic Approach to Continental Drift, Continental Drift—A Symposium, Geology Department, University of Tasmania, Hobart, pp. 177–355.
Christie, D. M. and Sinton, J. M., 1981, Evolution of Abyssal Lavas Along Propagating Segments of the Galapagos Spreading Center, Earth Planet. Sci. Lett. 56, 321–335.
Coleman, P. and Packham, G., 1976, The Melanesian Borderlands and India-Pacific Plates' Boundary, Earth Science Review 12, 197–233.
Connelly, J. B., 1974, A Structural Interpretation of Magnetometer and Seismic Profiler Records in the Bismarck Sea, Melanesian Archipelago, J. Geol. Soc. Aust. 21, 459–469.
Connelly, J. B., 1976, Tectonic Development of the Bismarck Sea Based on Gravity and Magnetic Modelling, Geophys. J. Roy. Astron. Soc. 46, 23–40.
Cooper, P. and Taylor, B., 1987, Seismotectonics of New Guinea: A Model for Arc Reversal Following Arc Continent Collision, Tectonics 6, 53–67.
Cooper, P. and Taylor, B., 1989, Seismicity and Focal Mechanisms at the New Britain Trench Related to Deformation of the Lithosphere, Tectonophysics 164, 25–40.
Craig, H. and Poreda, R., 1987, Studies of Methane and Helium in Hydrothermal Vent Plumes, Spreading Axis Basalts, and Volcanic Island Lavas and Gases, Scripps Inst. Oceanography, Southwestern Pacific Marginal Basins, SIO Ref. 87-14, 37–43.
Curtis, J. W., 1973a, Plate Tectonics and the Papua-New Guinea—Solomon Islands Region, J. Geol. Soc. Aust. 20, 21–36.
Curtis, J. W., 1973b, The Spatial Seismicity of Papau New Guinea and the Solomon Islands, J. Geol. Soc. Aust. 20, 1–20.
Davies, H. L. and Price, R. C., 1987, Basalts from the Solomon and Bismarck Seas, Geo-Mar. Lett 6, 193–202.
Denham, D., 1969, Distribution of Earthquakes in the New Guinea Soloman Islands Region, J. Geophys. Res. 74, 4290–4299.
Eguchi, T., Fujinawa, Y. and Ukawa, M., 1989, Earthquakes Associated with the Back-Arc Opening in the Eastern Bismarck Sea: Activity, Mechanisms, and Tectonics, Phys. Earth. Planet. Interiors 56, 189.
Eguchi, T., Fujinawa, Y., Ukawa, M. and Bibot, L., 1987, Microearthquakes Along the Back-Arc Spreading System in the Eastern Bismarck Sea, Geo-Mar. Lett 6, 235–240.
Falvey, D. A. and Pritchard, T., 1985, Preliminary Paleomagnetic Results from Northern Papua New Guinea: Evidence for Large Microplate Rotations, Trans. Circum.-Pac. Counc. Energy Miner. Resour. 3, 593–600.
Francis, G., 1988, Stratigraphy of Manus Island, Western New Ireland Basin, Papua New Guinea, in Marlow, M. S., Dafisman, S. V. and Exon, N. F. (eds.), Geology and Offshore Resources of Pacific Island Arcs-New Ireland and Manus Region, Papua New Guinea, Earth Science Series 9, pp. 31–40.
Gill, J. B., Morris, J. D. and Johnson, R. W., 1993, Timescale for Producing the Geochemical Signature of Island Arc Magmas: U-Th-Po and Be-B Systematics in Recent Papua New Guinea Lavas, Geochem. Cosmochem. Acta 57, 4269–4283.
Hamburger, M. W. and Isacks, B. L., 1988, Diffuse Back-Arc Deformation in the Southwestern Pacific, Nature 332, 599–604.
Hawkins, J., Parson, L., Allen, J., et al., 1994, Proc. ODP, Sci. Results, 135. Ocean Drilling Program, College Station, TX, 984 pp.
Heming, R. F., 1974, Geology and Petrology of Rabaul Caldera, PNG, Bull. Geol. Soc. Amer. 85, 1253–1264.
Hey, R. N., 1977, A New Class of “Pseudofaults” and Their Bearing on Plate Tectonics: A Propagating Rift Model, Earth Planet. Sci. Lett. 37, 321–325.
Hey, R. N., Menard, H. W., Atwater, T. M. and Caress, D. W., 1988, Changes in Direction of Seafloor Spreading Revisited, J. Geophys. Res. 93, 2803–2811.
Hey, R. N., Naar, D. F., Kleinrock, M. C., Morgan, W. J. P., Morales, E. and Shilling, J.-G., 1985, Microplate Tectonics Along a Superfast Seafloor Spreading System Near Easter Island, Nature 317, 320–325.
Jaques, A. L. and Robinson, G. P., 1977, The Continent/Island-Arc Collision in Northern Papua New Guinea, BMR J. Aust. Geol. Geophys. 2, 289–303.
Johnson, R., Smith, I. E. M. and Taylor, S. R., 1978, Hot-Spot Volcanism in St. Andrew Strait, Papua New Guinea: Geochemistry of a Quaternary Bimodal Rock Suite, BMR J. Aust. Geol. Geophys. 3, 55–69.
Johnson, R. W., 1976, Late Cainozoic Volcanism and Plate Tectonics at the Southern Margin of the Bismarck Sea, Papua New Guinea, in Johnson, R. W. (ed.), Volcanism in Australasia, Elsevier, pp. 101–116.
Johnson, R. W. and Arculus, R. J., 1978, Volcanic Rocks of the Witu Island, Papua New Guinea: The Origin of Magmas Above the Deepest Part of the New Britain Benioff Zone, Bull. Volcanol. 41, 609–655.
Johnson, R. W., Mutter, J. C. and Arculus, R. J., 1979, Origin of the Willaumez-Manus Rise, Papua New Guinea, Earth Planet. Sci. Lett. 44, 247–260.
Johnson, T. and Molnar, P., 1972, Focal Mechanisms and Plate Tectonics of the Southwest Pacific, J. Geophys. Res. 77, 5000–5032.
Karig, D. E., Anderson, R. N. and Bibee, L. D., 1978, Characteristics of Back Arc Spreading in the Mariana Trough, J. Geophys. Res. 83, 1213–1226.
Kleinrock, M. C. and Hey, R. N., 1989, Detailed Tectonics Near the Tip of the Galapagos 95.5° W Propagator: How the Lithosphere Tears and a Spreading Axis Develops., J. Geophys. Res. 94, 13801–13838.
Kroenke, L. W., 1984, Cenozoic Tectonic Development of the Southwest Pacific, U.N. ESCAP. CCOPISOPAC Tech. Bull. 6, 126 pp.
Larson, R. L., Searle, R. C., Kleinrock, M. C., Schouten, H., Bird, R. T., Naar, D. F., Rusby, R. I., Hooft, E. E. and Lasthiotakis, H., 1992, Roller-Bearing Tectonic Evolution of the Juan Fernandez Microplate, Nature 356, 571–576.
Lawver, L. A. and Hawkins, J. W., 1978, Diffuse Magnetic Anomalies in Marginal Basins: Their Possible Tectonic and Petrologic Significance, Tectonophysics 45, 323–339.
Leg 135 Scientific Party, 1991, A New View of Arc/Backarc Systems, Geotimes 36, 19–20.
Leg 135 Scientific Party, 1992, Evolution of Backarc Basins: ODP Leg 135, Lau Basin, EOS, Trans. Am. Geophys. Union 73, 241–247.
Lindley, D., 1988, Early Cainozoic Stratigraphy and Structure of the Gazelle Peninsula, East New Britain: An Example of Extensional Tectonics in the New Britain Arc-Trench Complex, Aust. J. Earth Sci. 35, 231–244.
Macdonald, K. C., Miller, S. P., Huestis, S. P. and Spiess, F. N., 1980, Three-Dimensional Modeling of a Magnetic Reversal Boundary from Inversion of Deep-Tow Measurements, J. Geophys. Res. 85, 3670–3680.
Mallonee, R. L., 1989, Extensional Responses to Transtension in the Manus Backarc Basin, M.S. thesis, University of Hawaii at Manoa, pp. 84.
Martinez, F., Fryer, P., Baker, N. and Yamazaki, T., 1995, Evolution of Backarc Rifting: Mariana Trough 20°–24°N, J. Geophys. Res. 100, 3807–3827.
McKenzie, D. and Jackson, J., 1986, A Block Model of Distributed Deformation by Faulting, J. Geol. Soc. London 143, 349–353.
Page, R. W. and Ryburn, R. J., 1977, K-Ar Ages and Geological Relation of Intrusive Rocks in New Britain, Pacific Geology 12, 99–105.
Parker, R. L., 1972, The Rapid Calculation of Potential Anomalies, Geophys. J. Roy. Astron. Soc. 31, 447–455.
Ripper, I. D., 1975, Earthquake Focal Mechanism Solutions in the New Guniea/Solomon Islands Region, 1963–1968, Aust. Bur. Miner. Resour. Rep. 178, 120 p.
Schouten, H., Klitgord, K. D. and Gallo, D. G., 1993, Edge-Driven Microplate Kinematics, J. Geophys. Res. 98, 6689–6701.
Sempéré, J.-C., Gee, J., Naar, D. F. and Hey, R. N., 1989, Three-Dimensional Inversion of the Magnetic Field Over the Easter-Nazca Propagating Rift Near 25° S, 112°25′ W, J. Geophys. Res. 94, 17,409–17,420.
Sinton, J. M., Liu, L., Taylor, B. and Chappell, B., 1986, Petrology, Magmatic Budget and Tectonic Setting of the Manus Back-Arc Basin Lavas, EOS, Trans. Am. Geophys. Union 67, 377–378.
Small, C. and Sandwell, D. T., 1989, An Abrupt Change in Ridge Axis Gravity with Spreading Rate, J. Geophys. Res. 94, 17,383–17,392.
Stewart, W. D. and Sandy, M. J., 1988, Geology of New Ireland and Djaul Islands, Northeastern Papua New Guinea, in Marlow, M. S., Dafisman, S. V. and Exon, N. F. (eds.), Geology and Offshore Resources of Pacific Island Arcs-New Ireland and Manus Region, Papua New Guinea, Circum-Pacific Council for Energy and Mineral Resources, Earth Science Series 9, pp. 13–30.
Taylor, B., 1979, Bismarck Sea: Evolution of a back-arc basin, Geology 7, 171–174.
Taylor, B., Crook, K. and Sinton, J., 1994, Extensional Transform Zones and Oblique Spreading Centers, J. Geophys. Res. 99, 19,707–19,718.
Taylor, B., Crook, K. A. W., Sinton, J. M., Petersen, L., Mallonee, R., Kellogg, J. N. and Martinez, F., 1991a, Manus Basin, Papua New Guinea: SeaMARC II Sidescan Sonar Imagery, Bathymetry, Magnetic Anomalies, and Free-Air Gravity Anomalies, 1: 1,000,000, Pacific Seafloor Atlas, Hawaii Institute of Geophysics, Honolulu.
Taylor, B., Crook, K. A. W., Sinton, J. M., and Peterson, L., 1991b, Manus Basin, Papua New Guinea, Sea MARC II Bathymetry, 1: 250,000, Pacific Seafloor Atlas, Hawaii Institute of Geophysics, Honolulu.
Taylor, B., Crook, K. A. W., Sinton, J. M. and Peterson, L., 1991c, Manus Basin, Papua New Guinea, Sea MARC II Sidescan Sonar Imagery, 1:250,000, Pacific Seafloor Atlas, Hawaii Institute of Geophysics, Honolulu.
Taylor, B. and Karner, G. D., 1983, On the Evolution of Marginal Basins, Rev. Geophys. Space Phys 21, 1727–1741.
Taylor, B., Mallonee, R., Crook, K. and Sinton, J., 1987, The Manus Microplate, EOS, Trans. Am. Geophys. Union 68, 1476.
Taylor, B., Sinton, J., Shipboard, Party and Crook, K., 1986, Extensional Transform Zone, Sulphide Chimneys and Gastropod Vent Fauna in the Manus Back-Arc Basin, EOS, Trans. Am. Geophys. Union 67, 377.
Tufar, W., 1989, Modern hydrothermal Activity, Formation of Complex Massive Sulfide Deposits and Associated Vent Communities in the Manus Back-Arc Basin (Bismarck Sea, Papua New Guinea), Mitt. österr. geol. Ges. 82, 183–210.
Wessel, P., 1989, XOVER: A Cross-over Error Detector for Track Data, Comput. and Geosci. 15, 333–346.
Wessel, P. and Smith, W. H. F., 1991, Free Software Helps Map and Display Data, EOS, Trans. Am. Geophys. Union 72, 441–446.
Wessel, P. and Smith, W. H. F., 1995, New Version of the Generic Mapping Tools Released, EOS, Trans. Am. Geophys. Union 76, 329.
Woodhead, J. D. and Johnson, R. W., 1993, Isotopic and Trace Element Profiles Across the New Britain Island Arc, Papua New Guinea, Contrib. Mineral. Petrol. 113, 479–491.
Weissel, J. K., 1981, Magnetic Lineations in Marginal Basins of the West Pacific, Phil. Trans. Roy. Soc. Lond., Ser. A 300, 223–247.
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Martinez, F., Taylor, B. Backarc spreading, rifting, and microplate rotation, between transform faults in the Manus Basin. Marine Geophysical Researches 18, 203–224 (1996). https://doi.org/10.1007/BF00286078
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DOI: https://doi.org/10.1007/BF00286078