Citation:

odp.proc.sr.124.128.1991

Name: Miocene radiolarians of the Sulu Sea
Creator: Reed P Scherer
Published: 1991
License: https://creativecommons.org/licenses/by/3.0/

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Abstract:

Radiolarians are sporadic in sediments collected in the Sulu Sea during ODP Leg 124. Due to the generally poor preservation and low abundance of radiolarians in Sulu Sea sediments, no biostratigraphic datums are well defined, although three radiolarian zones are identified. Most samples containing radiolarians are pelagic or hemipelagic clays with varying proportions of volcanic ash. Detailed analysis of Sulu Sea radiolarians was limited to Miocene successions. Pliocene and Quaternary occurrences of radiolarians were noted but have not been zoned.

The late middle Miocene of Sites 769 and 771 is represented by an assemblage of radiolarians (Diartus petterssoni Zone) that is entirely replaced by massive pyrite. This type of preservation develops only under anoxic conditions. The development of widespread anoxia in Sulu Sea waters in the late middle Miocene was probably the result of hydrologic isolation of basin waters, and may be associated with eustatic sea level fall over the silled basin.

Upper lower Miocene pelagic and hemipelagic sediments that overlie pyroclastics and basalt flows in the Sulu Sea sites contain moderately to very poorly preserved radiolarians of the Calocycletta costata Zone. A thin unit of marine claystone was recovered from between the thick pyroclastics and basement rocks at Site 768. Radiolarians present in these claystones are rare and very poorly preserved. This radiolarian assemblage probably represents the C. costata Zone, although very poor preservation and low abundance make this interpretation equivocal. The radiolarian zones identified constrain the age of basin formation to late early Miocene or earlier.

Project(s):

Ocean Drilling Program (ODP)

Coverage:

Median Latitude: 8.487867 * Median Longitude: 121.064678 * South-bound Latitude: 8.000000 * West-bound Longitude: 120.679700 * North-bound Latitude: 8.785400 * East-bound Longitude: 121.294533

Date/Time Start: 1988-12-01T14:30:00 * Date/Time End: 1989-01-02T13:00:00

Event(s):

124-768C * Latitude: 8.000000 * Longitude: 121.219800 * Date/Time Start: 1988-12-01T14:30:00 * Date/Time End: 1988-12-13T07:00:00 * Elevation: -4396.0 m * Penetration: 1268.5 m * Recovery: 525.69 m * Location: Sulu Sea * Campaign: * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 100 cores; 915 m cored; 0 m drilled; 57.5 % recovery

124-769 * Latitude: 8.785400 * Longitude: 121.294533 * Date/Time Start: 1988-12-14T00:00:00 * Date/Time End: 1988-12-18T00:00:00 * Elevation: -3656.0 m * Penetration: 732.5 m * Recovery: 401.5 m * Location: Sulu Sea * Campaign: * Basis: Joides Resolution * Method/Device: Composite Core (COMPCORE) * Comment: 51 cores; 471.4 m cored; 0 m drilled; 85.2% recovery

124-771A * Latitude: 8.678200 * Longitude: 120.679700 * Date/Time Start: 1988-12-31T21:30:00 * Date/Time End: 1989-01-02T13:00:00 * Elevation: -2870.0 m * Penetration: 304.1 m * Recovery: 89.97 m * Location: Sulu Sea * Campaign: * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 18 cores; 169 m cored; 0 m drilled; 53.2 % 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

Scherer, RP (1991): (Table 1) Occurrence of radiolarians in ODP Hole 124-768C. https://doi.org/10.1594/PANGAEA.729502
Scherer, RP (1991): (Table 2) Occurrence of radiolarians in ODP Site 124-769. https://doi.org/10.1594/PANGAEA.729503
Scherer, RP (1991): (Table 3) Occurrence of radiolarians in ODP Hole 124-771A. https://doi.org/10.1594/PANGAEA.729504