U.S. JGOFS Arabian Sea Process Study

Sediment Composition

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Processing notes:

December 2002, Warren Prell

1. Data for -1 to O interval are measure on unconsolidated phytodetritus layer

sitting on top of sediment water interface

2. Letter for each core refers to a multicore section

3. Opal determined using Mortlock and Froelich (1989, DSR, vol 36, 1415-1426)

4. CaCO3 detemined on automated Carbonate rig similar to Ostermann et al. (1990)

5. CaCO3-ICP = 2.5* Ca determined from ICP.

6. Corg and N% determined using technique of Verardo et al. (1990, DSR, 37, 157-165)

7. Ca, Mn, Fe, Al, Ti, and P determined on ICP-AES using technique of

Murray and Leinen (1996, GCA, 3869-3878)

8. Density calculated from dried weight of known volume of sample extruded from subcore

9. Sedimentation rates estimated from C-14 dating of monospecific foraminifer shells

from sampled depths. For all but JGOFS-1, both menardii and sacculifer (when available)

ages were used to calculate sedimentation rate. In practice JGOFS-5 had one sacculifer

and 5 menardii and Owen Ridge 2 had 8 menardii and 6 sacculifer, the rest have only

menardii. For JGOFS-1, the data on the 2 species measured were significantly different

so two separate rates were calculated- one for each species (C14_sed_rate calculated

from G. menardii, and C14_sed_rate_2 from G. sacculifer).

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References:
Mortlock, R.A., and Froelich, P.N., 1989.  A simple method for the rapid
determination of biogenic opal in pelagic marine sediments.  Deep-Sea Res.,
36:1415-1426.

Ostermann, D.R., Karbott, D., and Curry, W.B., 1990. Automated system to
measure carbonate concentration of sediments. Woods Hole Oceanog. Inst.
Tech. Rept., WHOI-90-03.

Verardo, D., Froelich, P.N., and McIntyre, A., 1990. Determination of
organic carbon and nitrogen in marine sediments using the Carlo Erba NA-1500
analyzer. Deep-Sea Research, 37: 157-165.

Murray, R. W. and Leinen, M. 1996.  Scavenged excess aluminum and its
relationship to bulk titanium in biogenic sediment from the central
equatorial Pacific Ocean.  Geochimica et Cosmochimica Acta, 60 (20):
3869-3878.