Summary of revised age assignments for ODP Leg 180

Takahashi, K.; Cortese, Giuseppe; Frost, Gina Marie; Gerbaudo, Stefania; Goodliffe, A. M.; Ishikawa, Naoto; Lackschewitz, Klas; Perembo, Russell C B; Resig, Johanna M.; Siesser, William G.; Taylor, Brian; Testa, M.

doi:10.2973/odp.proc.sr.180.152.2001

Cited by 4 publications

(12 citation statements)

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“…An abrupt decrease in the concentration of ferrimagnetic minerals was recorded at around 415 mbsf at Site 1115 and at around 550 mbsf at Site 1109. Age data for the sedimentary successions (Takahashi et al, 2001) indicate that this change occurred at around 3.8 Ma (Fig. 3); a planktonic foraminifer datum indicates an age of 3.8 Ma at 412.07-407.31 mbsf in Site 1115 and at 551.0-548 mbsf in Site 1109.…”

Section: Discussionmentioning

confidence: 99%

“…Based on age assignments for the sedimentary successions (Takahashi et al, 2001; Fig. 3), the onset of the change is slightly different at the three sites; as the distance of the site location from the normal fault at the Moresby Seamount increases, the age of the change becomes younger.…”

Section: Discussionmentioning

confidence: 99%

“…at Site 1115 and from ∼98 to ∼297 m/m.y. at Site 1109 (Takahashi et al, 2001). An abrupt increase of sedimentation rate, that is, an accelerated subsidence during rifting in the Woodlark Basin, may have caused a change in the depositional environment around sites 1115 and 1109.…”

Section: Discussionmentioning

confidence: 99%

“…Biostratigraphic and paleomagnetic results provided well-constrained age-depth profiles (Fig. 3), which indicate a subsidence history on the northern margin of the Moresby Seamount associated with continental rifting (Taylor et al, 1999b;Takahashi et al, 2001).…”

Section: Introductionmentioning

confidence: 99%

“…3. Sedimentation curves, sedimentation rates, and paleobathymetry at sites 1109, 1115, and 1118, modified from Takahashi et al (2001). Symbols with arrows indicate that the actual datum points could be above or below and older or younger than indicated by the symbols.…”

Section: New Britainmentioning

confidence: 99%

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Magnetic properties of sediments from Ocean Drilling Program sites 1109, 1115, and 1118 (Leg 180), Woodlark Basin (Papua New Guinea)

Ishikawa

Frost

2014

Earth Planet Sp

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Latest Miocene-Pleistocene synrift sediments at Ocean Drilling Program sites 1109, 1115, and 1118 (Leg 180), located on the hanging wall margin north of the Moresby fault in the Woodlark Basin, showed variations in magnetic parameters carried by magnetite and maghemite related to sedimentation process in the basin. At sites 1109 and 1115, an increase in the sedimentation rate at 3.8 Ma was accompanied by the deposition of sediments with low ferrimagnetic mineral concentrations. An increase in the ferrimagnetic mineral concentrations occurred between 3.4 Ma and 3.2 Ma at the three sites. The onset age of the change became younger with distance from the subsidence center of the basin near the Moresby fault: 3.4 Ma at Site 1118, 3.3 Ma at Site 1109, and 3.2 Ma at Site 1115, which implies a northward onlapping of sediments with high ferrimagnetic mineral concentration. Sediments with finer-grained ferrimagnetic minerals were deposited between 2.3 and 2.0 Ma at sites 1118 and 1109 and later, 2.8 Ma at Site 1115 during a period of a low sedimentation rate. The upper parts of sites 1109 and 1115 had a diamagnetic contribution, which is attributed to relatively high concentrations of diamagnetic pelagic materials at a low sedimentation rate associated with the low frequency of turbidites.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: New Britainmentioning

confidence: 99%

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Magnetic properties of sediments from Ocean Drilling Program sites 1109, 1115, and 1118 (Leg 180), Woodlark Basin (Papua New Guinea)

Ishikawa

Frost

2014

Earth Planet Sp

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Late Cenozoic volcanism in the western Woodlark Basin area, SW Pacific: the sources of marine volcanic ash layers based on their elemental and Sr–Nd isotope compositions

et al. 2003

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Tephra fallout layers and volcaniclastic deposits, derived from volcanic sources around and on the Papuan Peninsula, form a substantial part of the Woodlark Basin marine sedimentary succession. Sampling by the Ocean Drilling Program Leg 180 in the western Woodlark Basin provides the opportunity to document the distribution of the volcanically-derived components as well as to evaluate their chronology, chemistry, and isotope compositions in order to gain information on the volcanic sources and original magmatic systems. Glass shards selected from 57 volcanogenic layers within the sampled Pliocene-Pleistocene sedimentary sequence show predominantly rhyolitic compositions, with subordinate basaltic andesites, basaltic trachy-andesites, andesites, trachy-andesites, dacites, and phonolites. It was possible to correlate only a few of the volcanogenic layers between sites using geochemical and age information apparently because of the formation of strongly compartmentalised sedimentary realms on this actively rifting margin. In many cases it was possible to correlate Leg 180 volcanic components with their eruption source areas based on chemical and isotope compositions. Likely sources for a considerable number of the volcanogenic deposits are Moresby and Dawson Strait volcanoes (D'Entrecasteaux mobilisation of the deep continental crust during active rift propagation.

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The boundary between continental rifting and sea-floor spreading in the Woodlark Basin, Papua New Guinea

Goodliffe

Taylor

2007

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Seismic reflection, bathymetry, acoustic imagery and magnetic data are presented that encompass the boundary between rifting of the Papuan continent and westward propagating sea-floor spreading in the Woodlark Basin. West of the spreading tip, the southern margin is characterized by large fault blocks, which were tilted to the south on north-dipping normal faults during the current rifting phase, and graben further south where previous rifting failed. The northern margin is devoid of large offset normal faults and its subsidence from near sea level requires synrift flow of the lower crust. The margin asymmetry primarily reflects across-strike differences in the prerift geology, morphology and rheology. Horst and graben with 3 km relief below sea level occur adjacent to the spreading tip. Although heat flow data imply greater crustal thinning to the south of Moresby continental seamount, seismicity shows that deformation is currently focused on the Moresby normal fault that bounds its northern side. Based on logging results from ODP Leg 180 and semblance analysis, depth conversion of seismic reflection data show that Moresby Fault has a dip ≥29°, which is compatible with an earthquake slip plane of 30°–33°. Directly east of Moresby Seamount, the first spreading segment is identified on the basis of magnetic, bathymetry and sidescan data to comprise two ring dykes in the west and Cheshire Seamount in the east. A seismic reflection line crossing the western ring dyke shows an intrusive body that cuts Moresby Fault at depth. Currently, intrusive rocks have only reached the surface near the ring dyke, leaving flat-lying synrift sediments, sills (?) and surface lava flows overlying the main intrusive body. The boundary between continental rifting and sea-floor spreading in the Woodlark Basin is spatially abrupt, although the processes overlap in time. The progression from rifting to spreading is characterized by a decrease in sedimentation as the margins are progressively thinned, subside below sea level, are eroded less and trap sediments in proximal basins. The post-rift sedimentation near the continent–ocean boundary is hemipelagic and drapes breakup topography without a distinct breakup unconformity. Synrift sediments, deposited above the 8.4 Ma rift onset unconformity and prior to breakup, are characterized by rotated sections (with parallel or diverging reflectors) as well as by ponded sections that onlap bounding fault blocks where local extension has ceased. Splayed reflectors representing sediment deposition on rotating fault blocks do not characterize the full synrift section, but only those times and places where extension is localized.

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Summary of revised age assignments for ODP Leg 180

Abstract: Based on revised and newly obtained age assignments, sediment accumulation rates and sedimentation curves were recalculated and redrawn, respectively, for Ocean Drilling Program Sites 1109, 1115, and 1118.

Cited by 4 publications

References 4 publications

Magnetic properties of sediments from Ocean Drilling Program sites 1109, 1115, and 1118 (Leg 180), Woodlark Basin (Papua New Guinea)

Magnetic properties of sediments from Ocean Drilling Program sites 1109, 1115, and 1118 (Leg 180), Woodlark Basin (Papua New Guinea)

Late Cenozoic volcanism in the western Woodlark Basin area, SW Pacific: the sources of marine volcanic ash layers based on their elemental and Sr–Nd isotope compositions

The boundary between continental rifting and sea-floor spreading in the Woodlark Basin, Papua New Guinea

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