Citation:

odp.proc.sr.125.169.1992

Name: Biostratigraphy and magnetostratigraphy of ODP Leg 125 holes
Published: 1992
License: https://creativecommons.org/licenses/by/3.0/

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Abstract:

Samples from 15 holes at nine sites in the Izu-Bonin-Mariana region were examined for calcareous nannofossils, foraminifers, diatoms, and radiolarians. The ages of the containing sediments range from middle Eocene to Holocene. Biostratigraphic indicators date the sediments flanking Conical Seamount in the Mariana forearc as Pleistocene, whereas sediments flanking a seamount at Site 784 in the Izu-Bonin forearc were dated as middle Miocene. Sediments in the Izu-Bonin forearc are as old as the middle Eocene. Useful magnetostratigraphic results range from Holocene to mid-Miocene. Nannofossils provided the most useful biostratigraphic framework, but were supplemented with satisfactory agreement by data from foraminifers, radiolarians, and diatoms. Evidence from the biostratigraphic framework shows the likely presence of a sedimentary hiatus in the early Miocene. The presence of a single short hiatus in the early Oligocene and two in the late Miocene and early Pliocene is suggested, but supporting evidence other than nannofossil data is sparse.

Evidence from approximate age-depth plots shows that sediment accumulation varies from hole to hole. The fastest rates of sediment accumulation were found to be in the late Miocene to Holocene whereas the slowest rates are present in the middle Eocene to Oligocene. The increased sedimentation rates in the late Miocene to Holocene resulted from an increase in volcanogenic sediment content from an uncertain source.

Project(s):

Ocean Drilling Program (ODP)

Coverage:

Median Latitude: 31.214667 * Median Longitude: 141.426067 * South-bound Latitude: 30.861000 * West-bound Longitude: 141.226000 * North-bound Latitude: 31.875000 * East-bound Longitude: 141.738000

Date/Time Start: 1989-03-16T18:00:00 * Date/Time End: 1989-04-04T12:00:00

Event(s):

125-782A * Latitude: 30.861000 * Longitude: 141.314200 * Date/Time Start: 1989-03-16T18:00:00 * Date/Time End: 1989-03-17T07:30:00 * Elevation: -2958.9 m * Penetration: 476.8 m * Recovery: 282 m * Location: North Pacific Ocean * Campaign: * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 50 cores; 476.8 m cored; 0 m drilled; 59.1 % recovery

125-784A * Latitude: 30.908000 * Longitude: 141.738000 * Date/Time Start: 1989-03-26T15:30:00 * Date/Time End: 1989-03-31T10:00:00 * Elevation: -4912.0 m * Penetration: 425.3 m * Recovery: 218.28 m * Location: North Pacific Ocean * Campaign: * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 45 cores; 425.3 m cored; 0 m drilled; 51.3 % recovery

125-786A * Latitude: 31.875000 * Longitude: 141.226000 * Date/Time Start: 1989-04-04T12:00:00 * Date/Time End: 1989-04-04T12:00:00 * Elevation: -3070.0 m * Penetration: 166.5 m * Recovery: 84.95 m * Location: North Pacific Ocean * Campaign: * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 19 cores; 166.5 m cored; 0 m drilled; 51 % recovery

License:

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

Size:

3 datasets

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Datasets listed in this publication series

Stabell, B; Ali, JR; Ciampo, G et al. (1992): (Table 1) Biostratigraphic and magnetostratigraphic events of ODP Hole 125-782A. https://doi.org/10.1594/PANGAEA.771113
Stabell, B; Ali, JR; Ciampo, G et al. (1992): (Table 2) Biostratigraphic and magnetostratigraphic events of ODP Hole 125-784A. https://doi.org/10.1594/PANGAEA.771115
Stabell, B; Ali, JR; Ciampo, G et al. (1992): (Table 3) Biostratigraphic and magnetostratigraphic events of ODP Hole 125-786A. https://doi.org/10.1594/PANGAEA.771116