Citation:

0091-7613(2002)030%3C0059:BIOSAA%3E2.0.CO;2

Name: 10Be data for sediments from DSDP Leg 56 and ODP Leg 170
Published: 2002
License: https://creativecommons.org/licenses/by/3.0/

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Abstract:

Sediment accretion and subduction at convergent margins play an important role in the nature of hazardous interplate seismicity (the seismogenic zone) and the subduction recycling of volatiles and continentally derived materials to the Earth's mantle. Identifying and quantifying sediment accretion, essential for a complete mass balance across the margin, can be difficult. Seismic images do not define the processes by which a prism was built, and cored sediments may show disturbed magnetostratigraphy and sparse biostratigraphy. This contribution reports the first use of cosmogenic 10Be depth profiles to define the origin and structural evolution of forearc sedimentary prisms. Biostratigraphy and 10Be model ages generally are in good agreement for sediments drilled at Deep Sea Drilling Project Site 434 in the Japan forearc, and support an origin by imbricate thrusting for the upper section. Forearc sediments from Ocean Drilling Program Site 1040 in Costa Rica lack good fossil or paleomagnetic age control above the decollement. Low and homogeneous 10Be concentrations show that the prism sediments are older than 3-4 Ma, and that the prism is either a paleoaccretionary prism or it formed largely from slump deposits of apron sediments. Low 10Be in Costa Rican lavas and the absence of frontal accretion imply deeper sediment underplating or subduction erosion.

Project(s):

Deep Sea Drilling Project (DSDP)

Ocean Drilling Program (ODP)

Coverage:

Median Latitude: 24.750500 * Median Longitude: -150.674550 * South-bound Latitude: 9.661600 * West-bound Longitude: 144.102000 * North-bound Latitude: 39.932700 * East-bound Longitude: -86.178900

Date/Time Start: 1977-09-12T00:00:00 * Date/Time End: 1996-11-18T12:00:00

Event(s):

56-434 * Latitude: 39.746000 * Longitude: 144.102000 * Date/Time: 1977-09-12T00:00:00 * Elevation: -5986.0 m * Penetration: 301 m * Recovery: 54.2 m * Location: North Pacific/TRENCH * Campaign: * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 33 cores; 301 m cored; 0 m drilled; 18 % recovery

56-436 * Latitude: 39.932700 * Longitude: 145.557800 * Date/Time: 1977-10-01T00:00:00 * Elevation: -5240.0 m * Penetration: 397.5 m * Recovery: 240.8 m * Location: North Pacific/RIDGE * Campaign: * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 42 cores; 397.5 m cored; 0 m drilled; 60.6 % recovery

170-1040B * Latitude: 9.661700 * Longitude: -86.179100 * Date/Time Start: 1996-11-05T15:45:00 * Date/Time End: 1996-11-08T06:30:00 * Elevation: -4178.0 m * Penetration: 190.2 m * Recovery: 127.92 m * Location: Costa Rica subduction complex, North Pacific Ocean * Campaign: * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 22 cores; 190.2 m cored; 0 m drilled; 67.3 % recovery

License:

Creative Commons Attribution 3.0 Unported (CC-BY-3.0)

Size:

4 datasets

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Datasets listed in this publication series

Morris, J; Valentine, R; Harrison, T (2002): (Table DR1) 10Be data for sediments from DSDP Hole 56-434. https://doi.org/10.1594/PANGAEA.713552
Morris, J; Valentine, R; Harrison, T (2002): (Table DR1) 10Be data for sediments from DSDP Hole 56-436. https://doi.org/10.1594/PANGAEA.713553
Morris, J; Valentine, R; Harrison, T (2002): (Table DR2) 10Be concentrations in ODP Hole 170-1040B sediments. https://doi.org/10.1594/PANGAEA.713554
Morris, J; Valentine, R; Harrison, T (2002): (Table DR2) 10Be concentrations in ODP Hole 170-1040C sediments. https://doi.org/10.1594/PANGAEA.713555