The Trobriand Subduction System in the Western Solomon Sea

Lock, Jo; Davies, H. L.; Tiffin, D L; Murakami, Fumitoshi; Kisimoto, Kiyoyuki

doi:10.1007/bf02238042

Cited by 33 publications

(22 citation statements)

References 4 publications

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“…This unusual distribution of arc volcanism complicates interpretation of the provenance of volcaniclastic sediments recovered during Leg 180. The outer high of the Trobriand Arc is inferred to be located about 100km to the NE of Site 1109 Smith & Milsom 1984;Lock et aL 1987) and represents the most northerly possible source of gravity-derived sediment to the Woodlark Rift.…”

Section: Miocene Timementioning

confidence: 99%

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Evolution of the Miocene-Recent Woodlark Rift Basin, SW Pacific, inferred from sediments drilled during Ocean Drilling Program Leg 180

Robertson

Awadallah

Gerbaudo

et al. 2001

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The results of drilling during Ocean Drilling Program Leg 180 provide insights into fundamental processes of continental break-up, because rifting can be related to westward propagation of a spreading centre into continental crust. A generally north-south transect of holes was drilled across the Woodlark Rift on the uplifted northern rift margin on the Moresby Seamount (Sites 1114 and 1116), on the hanging wall of the low-angle (25–30°) extensional Moresby Detachment Fault (Sites 1108, 1110–1113 and 1117) and across the downflexed northern rift margin (Sites 1118, 1109 and 1115). The results, when placed in the regional tectonic context, document a history of Palaeogene ophiolite emplacement, followed by Miocene arc-related sedimentation. Regional uplift and emergence of the forearc area took place in Late Miocene time. Submergence to form the Woodlark Rift began in latest Miocene time, marked by widespread marine transgression and shallow-water deposition, accompanied by input of air-fall tephra and volcaniclastic sediments. During Pliocene time, deposition within the rift basin was dominated by deep-water turbidites, including high-density turbidites in the south. Strong extension along the north-dipping Moresby Detachment Fault was active during Pleistocene time, associated with uplift of the Moresby Seamount and shedding of fault-derived talus, mainly of meta-ophiolitic origin. During Pleistocene time, a carbonate platform was constructed to the NW, trapping clastic sediment and resulting in a switch to slower, more pelagic and hemipelagic deposition within the Woodlark Rift Basin. The marked change in rift basin configuration during Pleistocene time may relate to westward propagation of the Woodlark oceanic spreading centre at c. 2 Ma.

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Section: Miocene Timementioning

confidence: 99%

“…Southwestward subduction of oceanic crust of the Solomon Sea initiated the Miocene-Recent Trobriand volcanic arc Lock et al 1987), which is well developed onshore in the Papuan Peninsula and also cored in offshore industry wells (Fig. 16).…”

Section: Miocene Timementioning

confidence: 99%

Evolution of the Miocene-Recent Woodlark Rift Basin, SW Pacific, inferred from sediments drilled during Ocean Drilling Program Leg 180

Robertson

Awadallah

Gerbaudo

et al. 2001

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“…1A). Subduction of seafloor in the Solomon Sea is possibly dormant now at the Trobriand Trough but was active during the Neogene (Lock et al, 1987). Muyuw was rifted away from the extension of the Maramuni assemblage into the Louisiade Archipelago by seafloor spreading along the oceanic Woodlark Rift (Russell, 1990), which lies south of Muyuw (Fig.…”

Section: Geologic Relations and Materialsmentioning

confidence: 97%

“…Muyuw granitic rocks are subvolcanic intrusions emplaced into the roots of the Maramuni volcanic arc (Dow, 1977) of the Papuan Peninsula and the Louisiade Archipelago ( Fig. 1A) associated with the subduction of oceanic lithosphere (Lock et al, 1987) downward to the southwest at the Trobriand Trough (Quarles van Ufford and , which lies north of Muyuw (Fig. 1A).…”

Section: Geologic Relations and Materialsmentioning

confidence: 98%

Sourcing temper sands in ancient ceramics with U–Pb ages of detrital zircons: a southwest Pacific test case

Tochilin

Dickinson

Felgate

et al. 2012

Journal of Archaeological Science

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“…Superimposed on this Paleogene basement is widespread middle Miocene to Holocene calcalkaline and shoshonitic magmatism (Smith and Milsom, 1984) (Hamilton, 1979;Davies and Jaques, 1984;Lock et al, 1987), though this remains controversial given the small number of intermediate-depth earthquakes beneath the region (Abers and Roecker, 1991) and the lack of 10 Be in the arc lavas (Gill et al, 1993). The geochemistry of the volcanics reveals melting and mixing of at least three magma sources: (1) (Tjhin, 1976;Stewart et al, 1986;Francis et al, 1987;Davies and Warren, 1988).…”

Section: Miocene-quaternary Arc and Forearcmentioning

confidence: 99%

Woodlark Basin

Huchon¹,

Taylor²,

Klaus³

1998

ODP Scientific Prospectus

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This Scientific Prospectus is based on pre-cruise JOIDES panel discussions and scientific input from the designated Co-Chief Scientists on behalf of the drilling proponents. The operational plans within reflect JOIDES Planning Committee and thematic panel priorities. During the course of the cruise, actual site operations may indicate to the Co-Chief Scientists and the Operations Manager that it would be scientifically or operationally advantageous to amend the plan detailed in this prospectus. It should be understood that any proposed changes to the plan presented here are contingent upon approval of the Director of the Ocean Drilling Program in consultation with the Science and Operations Committees (successors to the Planning Committee) and the Pollution Prevention and Safety Panel.Technical Editor: Karen K. Graber Leg 180 will drill a transect of three sites just ahead of the spreading tip: ACE-9a on the down flexed northern margin; ACE-8a through the rift basin sediments, the low-angle normal fault zone, and into the footwall; and ACE-3c near the crest of the footwall fault block (Moresby Seamount).The primary objectives at these sites are (1) to characterize the composition and in situ properties (stress, permeability, temperature, pressure, physical properties, and fluid pressure) of an active low-angle normal fault zone to understand how such faults slip, and (2) to determine the vertical motion history of both the downflexed hanging wall and the unloaded footwall as local groundtruth for input into regional models to determine the timing and amount of extension prior to spreading initiation.

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The Trobriand Subduction System in the Western Solomon Sea

Cited by 33 publications

References 4 publications

Evolution of the Miocene-Recent Woodlark Rift Basin, SW Pacific, inferred from sediments drilled during Ocean Drilling Program Leg 180

Evolution of the Miocene-Recent Woodlark Rift Basin, SW Pacific, inferred from sediments drilled during Ocean Drilling Program Leg 180

Sourcing temper sands in ancient ceramics with U–Pb ages of detrital zircons: a southwest Pacific test case

Woodlark Basin

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