Citation:

odp.proc.sr.184.206.2003

Name: Granulometry, mineralogy and geochemistry of ODP Holes 184-1147A and 184-1148A, South China Sea
Published: 2003
License: https://creativecommons.org/licenses/by/3.0/

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Abstract:

Green clay layers are reported from the Pliocene-Holocene intervals in five of the six sites drilled in the South China Sea (SCS) during Leg 184. Centimeter-scale discrete, discontinuous, and bioturbated layers, constituted by stiff and porous green clays, were observed, sometimes associated with iron sulfides and pyrite. Detailed mineralogical and geochemical analyses indicate that they differentiate from the host sediments in their higher content of iron, smectite, and mixed-layered clays and lower amounts of calcite, authigenic phosphorus, quartz, and organic matter. Although no glauconite was observed, the mineralogy and geochemistry of green clay layers, along with their geometrical relation to background sediments, suggest that they most likely represent the result of the first steps of glauconitization. Correlation between green layers and volcanic ash layers was suggested for green laminae observed elsewhere in Pacific sediments but was not confirmed at SCS sites. Statistical analysis of the temporal distribution of green layers in the records of the last million years suggests that green clay layers have become more frequent since 600 ka. Only at Site 1148 does the green layer record show a statistically significant cyclicity which may be related to orbital eccentricity. A possible influence of sea level variations, related both to climatic changes and tectonism, is postulated.

Project(s):

Ocean Drilling Program (ODP)

Coverage:

Median Latitude: 17.564193 * Median Longitude: 116.232950 * South-bound Latitude: 9.361933 * West-bound Longitude: 113.285133 * North-bound Latitude: 19.584017 * East-bound Longitude: 117.630967

Date/Time Start: 1999-03-03T00:00:00 * Date/Time End: 1999-04-10T00:00:00

Event(s):

184-1143 * Latitude: 9.361933 * Longitude: 113.285133 * Date/Time Start: 1999-03-03T00:00:00 * Date/Time End: 1999-03-10T00:00:00 * Elevation: -2772.3 m * Penetration: 1158.2 m * Recovery: 1101.8 m * Location: South China Sea * Campaign: * Basis: Joides Resolution * Method/Device: Composite Core (COMPCORE) * Comment: 126 cores; 1158.2 m cored; 0 m drilled; 95.1% recovery

184-1145 * Latitude: 19.584017 * Longitude: 117.630967 * Date/Time Start: 1999-03-18T00:00:00 * Date/Time End: 1999-03-21T00:00:00 * Elevation: -3175.5 m * Penetration: 598.1 m * Recovery: 554.7 m * Location: South China Sea * Campaign: * Basis: Joides Resolution * Method/Device: Composite Core (COMPCORE) * Comment: 65 cores; 598.1 m cored; 0 m drilled; 92.7% recovery

184-1146 * Latitude: 19.456700 * Longitude: 116.272917 * Date/Time Start: 1999-03-21T00:00:00 * Date/Time End: 1999-03-29T00:00:00 * Elevation: -2091.5 m * Penetration: 1455.6 m * Recovery: 1451.7 m * Location: South China Sea * Campaign: * Basis: Joides Resolution * Method/Device: Composite Core (COMPCORE) * Comment: 153 cores; 1450.6 m cored; 5 m drilled; 100.1% 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

Tamburini, F; Adatte, T; Föllmi, KB (2003): (Table T3) Bulk density, porosity, grain size and mineralogy of ODP Hole 184-1147A sediments. https://doi.org/10.1594/PANGAEA.785012
Tamburini, F; Adatte, T; Föllmi, KB (2003): (Table T4) Major element oxide and trace element concentration of ODP Hole 184-1148A sediments. https://doi.org/10.1594/PANGAEA.785013
Tamburini, F; Adatte, T; Föllmi, KB (2003): (Table T2) Depths and ages for green clay layers of ODP Leg 184 sites. https://doi.org/10.1594/PANGAEA.785036